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Hibernate+Struts应用程序的JavaWebStudio 2005下快速、可视化开发 (转)

Hibernate+Struts应用程序的JavaWebStudio 2005下快速、可视化开发


Struts中文论坛:http://www.javawebstudio.com/
JavaWebStudio 2005下载地址:http://www.javawebstudio.com/bbs/dispbbs.asp?boardID=5&ID=3&page=1

 

 

[目标]

本例的目标是实现一个简单的Struts 数据库应用程序。其功能是从SQL Server 2000中读取数据,并以表格的形式在输出页中显示出来。

定义一个名为“Test”表的字段:

录入一些测试数据:

  

[效果]

(1)全部显示:

输入页面:

输出页面:

 

(2)查询显示:

 

[背景知识]

 

 

[步骤]

 

1、打开Visual Struts开发环境:

从桌面JavaWebStudio快揵或BIN目录下的JavaWebStudio.exe文件启动JavaWebStudioVisual Struts开发环境。

 

2、建立一个“空的Hibernate_Struts项目模板”应用程序:

    选择菜单“文件”“新建”“新建项目”,弹出新建项目对话框,如图3-1所示:

 

在对话框中选择“空的Struts数据库应用模板”,在项目名称中输入“MyHibernate”,package (包名)和位置(项目的路径)采用默认的值就行,当然也可以根据需要改变。最后点击“确定”按钮完成新项目的建立。

 

从文件管理器中可看出MyHibernate项目的文件结构如下:

MyHibernate项目根目录下包含四个子目录和两个文件,这是JavaWebStudio项目的标准结构,最好不要改变它们默认的名称,否则会出现问题。

 

3、利用Struts数据库应用文件向导建立新的应用:

JavaWebStudio文件管理器内点击鼠标右键,在弹出的菜单中选择“HibernateHibernate_Struts文件向导”进入Struts文件向导对话框,也可以选择菜单“文件向导” Hibernate_Struts文件向导”进入Hibernate文件向导对话框。如下图所示:

1)输入文件名:

2)从数据源中导入SQL语句及数据表的字段信息(字段名和字段类型):

 

3)从数据据表中选择所需的表“Test”。

需要特别注意的是,这里的“从数据源中导入SQL语句及数据表的字段信息”及“从数据据表中选择所需的表”仅仅是为了自动生成SQL语句及读取字段信息,这里完成可以直接手工输入,与该项目的数据库连接池的配置无关,下面第(4)点将另行配置数据库连接池。

 

DAO文件、输入JSP文件、ActionForm文件、Action文件等选择默认就行了,主要是设置一下JSPOut文件,让它自动分页、每页显示4条记录,选择删除、编辑、链接和添加新记录功能。

 

接下来配置数据库连接池,其它属性页可采用默认的就行了,下面直接转去数据连接配置属性页即可。

(4)配置数据库连接池:

 

这里要特别注意的是Hibernate的数据库连接池配置文件是Hibernate.properties,并且dialect类名是org.hibernate.dialect.SQLServerDialect

 

4、项目文件结构

 

项目目录结构分析见如何实现最简单的Struts程序,这次Hibernate文件向导自动生成了八个文件,其中web目录下是输入、输出两个JSP文件,src目录下是Java文件。除了文件名是我们输入之外,所有程序源代码都是文件向导自动生成的,所有的配置也是自动完成的。

刷新JavaWebStudio文件管理器,这时发现web目录下自动生成了两个文件,分别是Test.jsp.jspTestInsert.jspTestOut.jsp.jsp,分别是查询条件输入JSP文件、新记录添加JSP文件和表格输出JSP文件;src\emptyprj目录下自动生成了五个文件,分别是TestAction.javaTestForm.java,前者是Action文件,后者是FormAction文件;还有是数据库操作文件Test.javaTestDAO.java,前者用于保存数据表记录的Bean,后者是数据库操作DAO文件;还要特别注意的是还有一个xml文件,就是Test.hbm.xml,用于Hibernate对象与数据库的映射。

 

Test.jsp文件:

 

TestInsert.jsp文件:

 

TestOut.jsp文件:

 

 

5、编译、启动服务器、运行:

  通过工具条上的按键分别编译项目及启动服务器,然后把开Test.jsp并通过工具条上的“运行”按键运行Test.jsp

这里将采用调试状态下的运行方式:

(1)       显示调试工具条:

 

注:单步执行可跟踪进原函数执行;单过程执行按语句跟踪,一般选择单过程执行即可。

 

2)选择调试状态下的“编译”:

输出栏中输出如下提示信息:

C:\Documents and Settings\Administrator\桌面>F:

F:\>cd F:\JavaWebStudio\JavaWebStudioWorkDir\MyHibernate

F:\JavaWebStudio\JavaWebStudioWorkDir\MyHibernate>ant -buildfile build.xml

Buildfile: build.xml

prepare:

     [copy] Copying 1 file to F:\JavaWebStudio\jakarta-tomcat-5.5.4\webapps\MyHibernate\WEB-INF\classes

compile:

    [javac] Compiling 5 source files to F:\JavaWebStudio\jakarta-tomcat-5.5.4\webapps\MyHibernate\WEB-INF\classes

    [javac] F:\JavaWebStudio\JavaWebStudioWorkDir\MyHibernate\src\emptyprj\TestAction.java:68: setUserID(int) in emptyprj.Test cannot be applied to (java.lang.String)

    [javac]                  m_Test.setUserID(expression);

    [javac]                        ^

    [javac] 1 error

BUILD FAILED

F:\JavaWebStudio\JavaWebStudioWorkDir\MyHibernate\build.xml:34: Compile failed; see the compiler error output for details.

Total time: 9 seconds

出现一个错误,原因是因为前面我们设置userID为整数类型,而这里的expression是字符串类型,所以要修改一下TestAction.java文件:

package  emptyprj;

 

 

import emptyprj.TestDAO;

 

import java.lang.reflect.InvocationTargetException;

import java.util.Locale;

import javax.servlet.ServletException;

import javax.servlet.http.HttpSession;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.PropertyUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionError;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionServlet;

import org.apache.struts.util.ModuleException;

import org.apache.struts.util.MessageResources;

 

import java.io.IOException;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Collection;

 

public final class TestAction extends Action

{

    // 变量定义:

    private Log log = LogFactory.getLog("org.apache.struts.webapp.Example");

    public TestAction() {

      

    }

 

 

    //函数定义:

    public ActionForward execute(ActionMapping mapping,

                             ActionForm form,

                             HttpServletRequest request,

                             HttpServletResponse response)

       throws Exception

    {

       // Extract attributes and parameters we will need

       Locale locale = getLocale(request);

       MessageResources messages = getResources(request);

       HttpSession session = request.getSession();

       TestForm m_TestForm = (TestForm) form;

      

                TestDAO m_TestDAO = TestDAO.getInstance();  //定义Hibernate__DAO对象,用于实现数据库的各种操作

 

                String action=request.getParameter("action");  //动作类型                 

                String search=request.getParameter("search");  //数据库查找方式

                String expression=request.getParameter("expression");    //参数,这里用于保存记录(行)的ID数据

               

                if(action==null)action="find";

              if(search==null)search="UNsearch";

              if(expression==null)expression="";

              expression=toChinese(expression);  //处理中文问题,实现编码转换

             

            /////////

              if("delete".equals(action))    //删除记录操作 

            {

                 Test m_Test= new Test();

                 //<delete>

                 m_Test.setUserID(expression);

                 //</delete>             

                   m_TestDAO.removeID(m_Test);

             }

 

            ////////////

             if("update".equals(action)||"insert".equals(action))    //更新、添加记录操作

             {

                 Test m_Test= new Test();

                     //<update>

                   m_Test.setUserID(m_TestForm.getUserID());

                   m_Test.setUsername(m_TestForm.getUsername());

                   m_Test.setPassword(m_TestForm.getPassword());

                   m_Test.setRole(m_TestForm.getRole());

                   //</update>

                    if("update".equals(action))    //调用DAO对象更新记录

                             m_TestDAO.update(m_Test,expression);

                    if("insert".equals(action))    //调用DAO对象添加记录

                         m_TestDAO.create(m_Test);

                              

             }

               

              ///////////////HQL_查找数据库

              String sql="from emptyprj.Test Test";

            

              ////SQL字符处理,主要是加入查询条件,如果是全部显示,可把这部分代码删除。

                if("search".equals(search))

                {

                  String selectsql;

                    //<search>

                       sql+=" where ";

                     sql+="userID";

                     sql+="=";

                     if("NULL".equals(expression)||"".equals(expression))

                    {

                           sql+=m_TestForm .getUserID();

                       }

                       else

                       {

                           sql+=expression;

                       }

                       

                       sql+="";

                    //</search>

                }

 

             //<分页>

                m_TestDAO.setLength(4);//设置每页显示记录数

                int ipage;//当前页

                try

                {

                    String page=request.getParameter("page");//分页参数,读取请求的当前页

                    ipage=java.lang.Integer.parseInt(page,10);

                }

                catch (Exception e)

             {

                 ipage=m_TestForm.getPage();

             }

             if(ipage<1)ipage=1;

             Collection col = m_TestDAO.findSQL("select Test "+sql,"select count(Test) "+sql,ipage);//通过DAO对象查询数据

                request.setAttribute("Test",col);  //保存数据     

               

                String pagestr=m_TestDAO.getPagestr(ipage);//分页字符串,分页内容

              String s_find,str;

                if(!"search".equals(search))    //查找和全部显示两个不同的操作,其分页字符串不同,在此进行处理。如果是全部显示则去掉"search=search&"

                {

                    s_find="search=search&";

                    while(pagestr.indexOf(s_find)!=-1)

                    {

                        str=pagestr.substring(0,pagestr.indexOf(s_find));

                        str+=pagestr.substring(pagestr.indexOf(s_find)+s_find.length(),pagestr.length());

                        pagestr=str;

                    }

                }

                m_TestForm.setPagestr(pagestr);  

              m_TestForm.setAction(action);     

                request.setAttribute("TestForm",m_TestForm);

              //</分页>

 

 

                return mapping.findForward("success");

    

    }

 

 public String toChinese(String ss) {

    //处理中文问题,实现编码转换

    if (ss != null) {

      try {

        String temp_p = ss;

        byte[] temp_t = temp_p.getBytes("ISO8859-1");

        ss = new String(temp_t);

      }

      catch (Exception e) {

        System.err.println("toChinese exception:" + e.getMessage());

        System.err.println("The String is:" + ss);

      }

    }

    return ss;

  }

 

}

把上述TestAction.java文件第68行:

m_Test.setUserID(expression);

修改成:

m_Test.setUserID(java.lang.Integer.parseInt(expression,10));

 

3)启动调试状态下的服务器:

输出栏中输出如下提示信息:

C:\Documents and Settings\Administrator\桌面>F:

F:\>cd F:\JavaWebStudio\\jakarta-tomcat-5.5.4\bin\

F:\JavaWebStudio\jakarta-tomcat-5.5.4\bin>startup_jpda.bat

Using CATALINA_BASE:   F:\JavaWebStudio\jakarta-tomcat-5.5.4

Using CATALINA_HOME:   F:\JavaWebStudio\jakarta-tomcat-5.5.4

Using CATALINA_TMPDIR: F:\JavaWebStudio\jakarta-tomcat-5.5.4\temp

Using JAVA_HOME:       F:\JavaWebStudio\jdk

 

服务器启动成功。

 

4)启动调试状态:

输出栏中输出如下提示信息:

下面将执行的命令是: JDB -attach jdbconn

Set uncaught java.lang.Throwable

Set deferred uncaught java.lang.Throwable

Initializing jdb ...

 

5)设置断点:

打开TestAction文件,分别在127136行设置两个断点。输出栏中输出如下提示信息:

下面将执行的命令是: JDB -attach jdbconn

Set uncaught java.lang.Throwable

Set deferred uncaught java.lang.Throwable

Initializing jdb ...

> 下面将执行的输入参数是: stop at emptyprj.TestAction:127

Deferring breakpoint emptyprj.TestAction:127.

It will be set after the class is loaded.

> 下面将执行的输入参数是: stop at emptyprj.TestAction:136

Deferring breakpoint emptyprj.TestAction:136.

It will be set after the class is loaded.

 

 

6)打开Test.jsp文件,并运行:

运行结果:

 

试一下全部显示功能,点击“全部显示”接钮,如果如下图所示:

可见运行到了断点第128行处,再点击一下调试工具条中的单过程执行,这时的变量值从输出提示栏中可看出:

http-8080-Processor25[1] 下面将执行的输入参数是: locals

下面将执行的输入参数是: next

Method arguments:

mapping = instance of org.apache.struts.action.ActionMapping(id=1701)

form = instance of emptyprj.TestForm(id=1702)

request = instance of org.apache.catalina.connector.RequestFacade(id=1703)

response = instance of org.apache.catalina.connector.ResponseFacade(id=1704)

Local variables:

locale = instance of java.util.Locale(id=1705)

messages = instance of org.apache.struts.util.PropertyMessageResources(id=1706)

session = instance of org.apache.catalina.session.StandardSessionFacade(id=1707)

m_TestForm = instance of emptyprj.TestForm(id=1702)

m_TestDAO = instance of emptyprj.TestDAO(id=1708)

action = "search"

search = "UNsearch"

expression = "NULL"

sql = "from emptyprj.Test Test"

ipage = 1

http-8080-Processor25[1] >

Step completed: "thread=http-8080-Processor25", emptyprj.TestAction.execute(), line=128 bci=509

 

http-8080-Processor25[1]

 

 

现在试一下单步执行:

http-8080-Processor25[1] 下面将执行的输入参数是: locals

下面将执行的输入参数是: step

Method arguments:

mapping = instance of org.apache.struts.action.ActionMapping(id=1752)

form = instance of emptyprj.TestForm(id=1753)

request = instance of org.apache.catalina.connector.RequestFacade(id=1754)

response = instance of org.apache.catalina.connector.ResponseFacade(id=1755)

Local variables:

locale = instance of java.util.Locale(id=1756)

messages = instance of org.apache.struts.util.PropertyMessageResources(id=1757)

session = instance of org.apache.catalina.session.StandardSessionFacade(id=1758)

m_TestForm = instance of emptyprj.TestForm(id=1753)

m_TestDAO = instance of emptyprj.TestDAO(id=1759)

action = "search"

search = "UNsearch"

expression = "NULL"

sql = "from emptyprj.Test Test"

ipage = 1

col = instance of java.util.ArrayList(id=2326)

http-8080-Processor25[1] >

Step completed: "thread=http-8080-Processor25", org.apache.catalina.connector.RequestFacade.setAttribute(), line=346 bci=0

http-8080-Processor25[1]

这时执行到了org.apache.catalina.connector.RequestFacade.setAttribute()RequestFacade.java文件的第246行。

 

 

点击一下调试工具条中的 “执行到下一个断点”,执行到第137行。

 

再点击一下调试工具条中的 “执行到下一个断点”,输出最后结果,如下图所示。

 

通过上述步骤,实现了预计的目标功能。

 

 

 

 

[程序源代码]

ConnectionFactory.java文件:

package  emptyprj;

import org.hibernate.HibernateException;

import org.hibernate.MappingException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class ConnectionFactory

{

       private static ConnectionFactory instance = null;

       private SessionFactory sessionFactory = null;

       private ConnectionFactory()

       {

              try

              {

                     //从这里装截映射文件

                     Configuration cfg = new Configuration().

                                             addClass(emptyprj.Test.class);

                     sessionFactory = cfg.buildSessionFactory();

              }

              catch (MappingException e)

              {

                     System.err.println("Mapping Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

       }

       public static synchronized ConnectionFactory getInstance()

       {

              if (instance == null)

              {

                     instance = new ConnectionFactory();

              }

              return instance;

       }

       public Session getSession()

       {

              try

              {

                     Session s = sessionFactory.openSession();

                     return s;

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

       }

}

 

Test.hbm.xml文件:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

        "-//Hibernate/Hibernate Mapping DTD 2.0//EN"

        "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

 

<hibernate-mapping>

    <class name="emptyprj.Test" table="users" >

        <id name="userID" column="userID" type="int" unsaved-value="null">

            <generator class="uuid.hex"/>

        </id>

        <property name="username" column="username" type="java.lang.String" />

        <property name="password" column="password" type="java.lang.String" />

        <property name="role" column="role" type="java.lang.String" />

     </class>

</hibernate-mapping>

 

hibernate.properties数据库连接池配置文件:

hibernate.dialect=org.hibernate.dialect.SQLServerDialect

hibernate.connection.driver_class=com.microsoft.jdbc.sqlserver.SQLServerDriver

hibernate.connection.url=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=EDB

hibernate.dbcp.min_size=5

hibernate.dbcp.max_size=20

hibernate.dbcp.timeout=1800

hibernate.dbcp.max_statements=50

hibernate.connection.username=sa

hibernate.connection.password=sa

 

///////////////////////////////////////////////////////////////////////////////////////////////////

Test.java文件:

这样定义一个用于保存数据表数据的Bean,它的变量与数据库表的字段完全对应,也就是与数据库应用文件向导中的SQL语句要查找的字段完全对应。

package  emptyprj;

import java.io.Serializable;

public class Test implements Serializable 

{

          private String  role;

          private String  password;

          private String  username;

          private int  userID;

    //myfiledata;

        public int getUserID()

        {

            return (this.userID);

        }

        public void setUserID(int userID)

        {

            this.userID=userID;

        }

        public String getUsername()

        {

            return (this.username);

        }

        public void setUsername(String username)

        {

            this.username=username;

        }

        public String getPassword()

        {

            return (this.password);

        }

        public void setPassword(String password)

        {

            this.password=password;

        }

        public String getRole()

        {

            return (this.role);

        }

        public void setRole(String role)

        {

            this.role=role;

        }

}

 

TestDAO.java文件:

  这里定义一个DAO类,用于实现数据加的查找、删除、更新、添加及生成分页字符串等功能。

package  emptyprj;

import emptyprj.Test;

 

import org.hibernate.HibernateException;

import org.hibernate.ObjectNotFoundException;

import org.hibernate.Query;

import org.hibernate.Session;

 

import java.util.List;

import java.util.Iterator;

 

public class TestDAO {

 

    private int rowCount;

    private int pageCount;

    private int length;     

    private String pagestr;

    public int getLength()  {  return (this.length);   }

    public void setLength(int length)  { this.length=length; } 

 

    private static TestDAO  instance = null;

    private TestDAO ()

    {

    }

 

       public static synchronized TestDAO  getInstance()

       {

              if (instance == null)

              {

                     instance = new TestDAO ();

              }

              return instance;

       }

 

       public Test getTest(Long id)

       {

              Session session = ConnectionFactory.getInstance().getSession();

              try

              {

                     return (Test) session.load(Test.class, id);

              }

              catch (ObjectNotFoundException onfe)

              {

                     return null;

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

              finally

              {

                     if (session != null)

                     {

                            try

                            {

                                   session.close();

                            }

                            catch (HibernateException e)

                            {

                                   System.err.println("Hibernate Exception" + e.getMessage());

                                   throw new RuntimeException(e);

                            }

 

                     }

              }

 

       }

 

      

       public void update(Test Test,String keyID)

       {

              Session session = ConnectionFactory.getInstance().getSession();

 

              try

              {

                     session.update(Test);

                     session.flush();

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

                 finally

              {

                     if (session != null)

                     {

                            try

                            {

                                   session.close();

                            }

                            catch (HibernateException e)

                            {

                                   System.err.println("Hibernate Exception" + e.getMessage());

                                   throw new RuntimeException(e);

                            }

 

                     }

              }

 

       }

 

       public void removeID(Test Test) {

             Session session = ConnectionFactory.getInstance().getSession();

              try

              {

                     session.delete(Test);

                     session.flush();

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

              finally

              {

                     if (session != null)

                     {

                            try

                            {

                                   session.close();

                            }

                            catch (HibernateException e)

                            {

                                   System.err.println("Hibernate Exception" + e.getMessage());

                                   throw new RuntimeException(e);

                            }

 

                     }

              }

 

       }

 

 

       public List findSQL(String sql,String countsql,int ipage)

       {

              Session session = ConnectionFactory.getInstance().getSession();

              try

              {

                     //提取记录总数

                     Iterator results = session.createQuery(countsql).iterate();

                     while ( results.hasNext() ) {

                         //Object[] row = results.next();

                              //rowCount= (Integer) row[0];

                              rowCount= (Integer) results.next();

                     }

                    

                    //rowCount=10;

                    int offset=1;

                    int pagesize=getLength();

                    if(getLength()<1)

                    {

                          pagesize=rowCount;

                        pageCount=1;

                    }

                    else

                    {

                        pageCount=rowCount/getLength()+((rowCount%getLength())>0?1:0);

                        offset=(ipage-1)*getLength()+1;

                        if(offset<1)offset=1;

                        if(offset>rowCount)offset=rowCount;       

        

                    }

                     //提取数据

                     Query query =       session.createQuery(sql);

                     query.setFirstResult((ipage-1)*getLength());

                     query.setMaxResults(pagesize);

                     return query.list();

 

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

              finally

              {

                     if (session != null)

                     {

                            try

                            {

                                   session.close();

                            }

                            catch (HibernateException e)

                            {

                                   System.err.println("Hibernate Exception" + e.getMessage());

                                   throw new RuntimeException(e);

                            }

                     }

              }

       }

 

       //添加一条新记录

       public void create(Test Test)

       {

              Session session = ConnectionFactory.getInstance().getSession();

              try

              {

                     session.save(Test);

                     session.flush();

              }

              catch (HibernateException e)

              {

                     System.err.println("Hibernate Exception" + e.getMessage());

                     throw new RuntimeException(e);

              }

              finally

              {

                     if (session != null)

                     {

                            try

                            {

                                   session.close();

                            }

                            catch (HibernateException e)

                            {

                                   System.err.println("Hibernate Exception" + e.getMessage());

                                   throw new RuntimeException(e);

                            }

                     }

              }

       }

 

    //分页字符串处理

    public String getPagestr(int ipage)

    {

           String strPage="";

              if(getLength()>0)

              {

                    strPage+="";

                    strPage+=String.valueOf(rowCount);

                    strPage+="条记录,共";

                    strPage+=String.valueOf(pageCount);

                    strPage+="页,当前是第";

                    strPage+=String.valueOf(ipage);

                    strPage+="页,      ";

               

                    int istart,iend;

                    istart=ipage-5;

                    if(istart<0) {istart=0;}

                    iend=istart+10;

                    if(iend>pageCount) {iend=pageCount;}

                    istart=iend-10;

                    if(istart<0) {istart=0;}

                    for(int i=istart;i<iend;i++)

                    {

                        strPage+="<a href='TestAction.do?action=find&search=search&page=";

                        strPage+=String.valueOf(i+1);

                        strPage+="'>";

                        strPage+=String.valueOf(i+1);

                        strPage+="</a>";

                        strPage+="  ";

                    }

           }

           this.pagestr=strPage;

           return strPage;

  }

 

}

TestForm.java文件:

  这里定义一个ActionForm Bean,除了包含与数据库表的字段完全对应的变量外(例如可用于保存查询条件中相应字段的变量的值、保存某行记录的数据等),还包含了与分页相关的变量,例如当前页码、分页字符串等变量。

package  emptyprj;

 

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionError;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

 

public final class TestForm extends ActionForm 

{

          private String  role;

          private String  password;

          private String  username;

          private int  userID;

          private int page;

          private String  pagestr;

          private String  action;

          private String mybeanvariable1;

    //myfiledata;

        public String getMybeanvariable1()

        {

            return (this.mybeanvariable1);

        }

        public void setMybeanvariable1(String mybeanvariable1)

        {

            this.mybeanvariable1=mybeanvariable1;

        }

        public String getAction()

        {

            return (this.action);

        }

        public void setAction(String action)

        {

            this.action=action;

        }

        public String getPagestr()

        {

            return (this.pagestr);

        }

        public void setPagestr(String pagestr)

        {

            this.pagestr=pagestr;

        }

        public int getPage()

        {

            return (this.page);

        }

        public void setPage(int page)

        {

            this.page=page;

        }

        public int getUserID()

        {

            return (this.userID);

        }

        public void setUserID(int userID)

        {

            this.userID=userID;

        }

        public String getUsername()

        {

            return (this.username);

        }

        public void setUsername(String username)

        {

            this.username=username;

        }

        public String getPassword()

        {

            return (this.password);

        }

        public void setPassword(String password)

        {

            this.password=password;

        }

        public String getRole()

        {

            return (this.role);

        }

        public void setRole(String role)

        {

            this.role=role;

        }

}

 

TestAction.java文件:

   这里定义一个Action类,用于实现页面的转发功能,另外还包括了不同请求类型的不同操作。其中action变量表示操作类型,相当于事件类型。通过这个变量,实现了类似于.NET中的“事件驱动”的功能。

package  emptyprj;

 

import emptyprj.TestDAO;

import java.lang.reflect.InvocationTargetException;

import java.util.Locale;

import javax.servlet.ServletException;

import javax.servlet.http.HttpSession;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.PropertyUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionError;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionServlet;

import org.apache.struts.util.ModuleException;

import org.apache.struts.util.MessageResources;

 

import java.io.IOException;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Collection;

 

public final class TestAction extends Action

{

    // 变量定义:

    private Log log = LogFactory.getLog("org.apache.struts.webapp.Example");

    public TestAction() {

      

    }

 

 

    //函数定义:

    public ActionForward execute(ActionMapping mapping,

                             ActionForm form,

                             HttpServletRequest request,

                             HttpServletResponse response)

       throws Exception

    {

       // Extract attributes and parameters we will need

       Locale locale = getLocale(request);

       MessageResources messages = getResources(request);

       HttpSession session = request.getSession();

       TestForm m_TestForm = (TestForm) form;

      

                 TestDAO m_TestDAO = TestDAO.getInstance();  //定义Hibernate__DAO对象,用于实现数据库的各种操作

 

                 String action=request.getParameter("action");  //动作类型                 

                 String search=request.getParameter("search");  //数据库查找方式

                 String expression=request.getParameter("expression");    //参数,这里用于保存记录(行)的ID数据

                

                 if(action==null)action="find";

              if(search==null)search="UNsearch";

              if(expression==null)expression="";

              expression=toChinese(expression);  //处理中文问题,实现编码转换

              

            /////////

               if("delete".equals(action))    //删除记录操作 

            {

                 Test m_Test= new Test();

                 //<delete>

                 m_Test.setUserID(java.lang.Integer.valueOf(expression));

                 //</delete>             

                    m_TestDAO.removeID(m_Test);

             }

 

            ////////////

              if("update".equals(action)||"insert".equals(action))    //更新、添加记录操作

              {

                 Test m_Test= new Test();

                     //<update>

                    m_Test.setUserID(m_TestForm.getUserID());

                    m_Test.setUsername(m_TestForm.getUsername());

                    m_Test.setPassword(m_TestForm.getPassword());

                    m_Test.setRole(m_TestForm.getRole());

                    //</update>

                     if("update".equals(action))    //调用DAO对象更新记录

                              m_TestDAO.update(m_Test,expression);

                     if("insert".equals(action))    //调用DAO对象添加记录

                          m_TestDAO.create(m_Test);

                              

              }

                

              ///////////////HQL_查找数据库

              String sql="from emptyprj.Test Test";

            

              ////SQL字符处理,主要是加入查询条件,如果是全部显示,可把这部分代码删除。

                 if("search".equals(search))

                 {

                  String selectsql;

                     //<search>

                        sql+=" where ";

                     sql+="userID";

                     sql+="=";

                     if("NULL".equals(expression)||"".equals(expression))

                    {

                            sql+=m_TestForm .getUserID();

                        }

                        else

                        {

                            sql+=expression;

                        }

                        

                        sql+="";

                     //</search>

                 }

 

             //<分页>

                m_TestDAO.setLength(4);//设置每页显示记录数

                int ipage;//当前页

                try

                {

                    String page=request.getParameter("page");//分页参数,读取请求的当前页

                    ipage=java.lang.Integer.parseInt(page,10);

                }

                catch (Exception e)

             {

                 ipage=m_TestForm.getPage();

             }

             if(ipage<1)ipage=1;

             Collection col = m_TestDAO.findSQL("select Test "+sql,"select count(Test) "+sql,ipage);//通过DAO对象查询数据

                request.setAttribute("Test",col);  //保存数据     

               

                String pagestr=m_TestDAO.getPagestr(ipage);//分页字符串,分页内容

              if(!"search".equals(search))    //查找和全部显示两个不同的操作,其分页字符串不同,在此进行处理。如果是全部显示则去掉"search=search&"

                 {

                     pagestr=pagestr.replaceAll("search=search&","");

                 }

                m_TestForm.setPagestr(pagestr);  

              m_TestForm.setAction(action);     

                request.setAttribute("TestForm",m_TestForm);

              //</分页>

 

 

                 return mapping.findForward("success");

    

    }

 

 public String toChinese(String ss) {

    //处理中文问题,实现编码转换

    if (ss != null) {

      try {

        String temp_p = ss;

        byte[] temp_t = temp_p.getBytes("ISO8859-1");

        ss = new String(temp_t);

      }

      catch (Exception e) {

        System.err.println("toChinese exception:" + e.getMessage());

        System.err.println("The String is:" + ss);

      }

    }

    return ss;

  }

 

}

web.xml文件:

  这里除了普通的Struts项目的配置之外,还包括数据库连接池的配置,见暗体字部分的代码。

<?xml version="1.0" encoding="ISO-8859-1"?>

 

<!DOCTYPE web-app

  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"

  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

 

<web-app>

 

  <!-- Standard Action Servlet Configuration -->

  <servlet>

    <servlet-name>action</servlet-name>

    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

       <load-on-startup>1</load-on-startup>

  </servlet>

   

<filter>

    <filter-name>Set Character Encoding</filter-name>

    <filter-class>javawebstudio.struts_db.SetCharacterEncodingFilter</filter-class>

    <init-param>

        <param-name>encoding</param-name>

        <param-value>GB2312</param-value>

    </init-param>

    <init-param>

        <param-name>ignore</param-name>

        <param-value>true</param-value>

    </init-param>

</filter>

 

<filter-mapping>

    <filter-name>Set Character Encoding</filter-name>

    <servlet-name>action</servlet-name>

</filter-mapping>

 

 

  <!-- Standard Action Servlet Mapping -->

  <servlet-mapping>

    <servlet-name>action</servlet-name>

    <url-pattern>*.do</url-pattern>

  </servlet-mapping>

 

 

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

 

 

  <!-- Struts Tag Library Descriptors -->

  <taglib>

    <taglib-uri>/bean</taglib-uri>

    <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>

  </taglib>

 

  <taglib>

    <taglib-uri>/html</taglib-uri>

    <taglib-location>/WEB-INF/struts-html.tld</taglib-location>

  </taglib>

 

  <taglib>

    <taglib-uri>/logic</taglib-uri>

    <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>

  </taglib>

 

  <taglib>

    <taglib-uri>/template</taglib-uri>

    <taglib-location>/WEB-INF/struts-template.tld</taglib-location>

  </taglib>

</web-app>

 

 

struts-config.xml文件:

<?xml version="1.0" encoding="ISO-8859-1" ?>

 

<!DOCTYPE struts-config PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN"

          "http://jakarta.apache.org/struts/dtds/struts-config_1_0.dtd">

 

<struts-config>

 

<form-beans>

 

 

<form-bean  name="TestForm"

                 type="emptyprj.TestForm"  />

</form-beans>

 

<action-mappings>

 

 

<action  path="/TestAction"

             type="emptyprj.TestAction"

              name="TestForm" 

            scope="request"

             input="/Test.jsp">

       <forward name="success"  path="/TestOut.jsp" /></action>

</action-mappings>

 

<!-- ========== Message Resources Definitions =========================== -->

 

  <message-resources    parameter="ApplicationResources_ch.properties"/>

 

  <message-resources    parameter="AlternateApplicationResources"

                         key="alternate">

  </message-resources>

 

</struts-config>

 

posted on 2005-02-04 13:35 轻松 阅读(1790) 评论(0)  编辑  收藏 所属分类: Struts相关


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