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Struts原理实例

STRUTS

1.WEB-INF中需要的配置(主要是实例化ActionServlet---struts-config.xml)

a. 如果标签不能识别:<jsp-config>

    <taglib>    <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>

            <taglib-location>/WEB-INF/c.tld</taglib-location>    </taglib>

b.配置欢迎页面: <welcome-file-list> <welcome-file>/logon.jsp</welcome-file>

                </welcome-file-list>

c.ActonServlet主要配置: <servlet> <servlet-name>action</servlet-name>

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

    <init-param> <param-name>config</param-name>

                 <param-value>/WEB-INF/struts-config.xml</param-value></init-param>

</servlet>

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

                          <url-pattern>*.do</url-pattern>     </servlet-mapping>

2.struts-config.xml配置:(主要为中央处理器建立关联)

a. <action-mappings >    <action

      path="/logon"  scope="request" type="mypack.action.LogonAction"

attribute="logonForm" name="logonForm"      input="/logon.jsp">   

<forward name="show" path="/AddAssociate.jsp" />

      <forward name="failure" path="/logon.jsp" />    </action>

b.<form-beans >

<form-bean name="logonForm" type="mypack.struts.form.LogonForm" /> </form-beans>

c.resource文件:<message-resources parameter="mypack.struts.ApplicationResources" />



3.
通过ActionFormvalidate方法若验证通过才创建action实例:

public ActionErrors validate(ActionMapping mapping,HttpServletRequest request) {

ActionErrors errors=new ActionErrors();if(userName==null){ //ActionMessage为父类

errors.add(“contant”,new ActionMessage(“resource.key”));//ActionErrors唯一方法

return errors;}

ActionErrorsActionMessages子类,add方法必须为ActionError,1.2采用ActionMessage

4.虽然ActionServlet只有一个,但是通过配置组件ModuleConfig来创建具体子模块处理器RequestProcessor,Action负责处理具体业务并通过ActionForward返回合适的结果.

: public class LogonAction extends Action {

    public ActionForward execute(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response) {

LogonForm logonForm = (LogonForm) form;   ActionErrors errors = new ActionErrors();

ActionForward forward = new ActionForward();

String userName = (String) (logonForm.getUserName()); if (!(userName.equals("admin"))

 errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionError("logonagain"));

if (!errors.isEmpty()) {

saveErrors(request, errors);   // saveErrors方法(request,errors必为ActionErrors)

     forward = mapping.findForward("failure");}

else { HttpSession session = request.getSession();

session.setAttribute("user", userName);forward = mapping.findForward("show");}

return forward;    }}




5.DAO
访问数据库的模型:

a.public class ConnectDB {  public static Connection getConnection(){

Connection conn=null;try{ Class.forName(driver);       

            conn=DriverManager.getConnection(url,user,password);}

catch(Exception e){e.printStackTrace();}    return conn;    }}

b.因为ActionForm中的数据生命周期只能到Action,于是只有通过action继续传递

AssociateForm associateForm = (AssociateForm) form;

String associateId=associateForm.getAssociateId();

String name=associateForm.getName();AssociateDao associateDao=new AssociateDao();

associateDao.addAssociateDao(associateId,name);将参数传递到DAO

c.DAO中插入数据: public void addAssociateDao(String associateId,String name) {  Connection  conn=ConnectDB.getConnection();

String sql="insert into associateInfo(associateId,name) values(?,?)";

    PreparedStatement pstmt=null; (try) pstmt=conn.prepareStatement(sql);

    pstmt.setString(1,associateId);pstmt.setString(2,name);pstmt.execute();




6.
访问数据库:a.jsp页面的标签: jstl<c:set/>标签调用DAOget方法并存在一定的范围

<jsp:useBean id="associateDao1" class="mypack.dao.AssociateDao" scope="page"/>

<c:set var="associates" value="${associateDao1.associateDao}" scope="page"/>

b. public Collection  getAssociateDao() throws SQLException{

    Connection   conn=ConnectDB.getConnection();

    Statement stmt=conn.createStatement();String sql="select * from associateInfo";

    ResultSet rs=stmt.executeQuery(sql);    List associateList=new ArrayList();

    while(rs.next()){Associate temp=new Associate();//需要创建一个模型层数据中介     temp.setAssociateId(rs.getString("associateId"));

temp.setName(rs.getString("name"));associateList.add(temp);}//将数据全部封装

    stmt.close();conn.close();  return associateList;  }

c. <logic:iterate id="associate" name="associates" >  //<logic:iterate/>迭代集合

     <td><bean:write name="associate" property="associateId" /></Td>

     <td><bean:write name="associate" property="name" /></Td>   </logic:iterate>



7.
validator框架实现验证:

a.jsp页面:  <html:form action="/valid" onsubmit="return validatevalidForm(this)" />

            <html:javascript formName="validForm"/>

b.struts-config.xml中配置插件: <plug-in className="org.apache.struts.validator.ValidatorPlugIn">

    <set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/valid.xml" />  </plug-in>

c. valid.xml的配置: <form-validation>

    <global>    <constant><constant-name>phone</constant-name>//设置全局变量

             <constant-value>^\d{8}\d*$</constant-value>    </constant> </global>

    <formset> <form name="validForm">

        <field property="phone" depends="required,mask">//通过变量验证的字段名

            <var> <var-name>mask</var-name> <var-value>${phone}</var-value> </var>

            <arg0 key="lable" />    </field>            </form> </formset>

</form-validation>

d. properties文件的key:errors.required ={0} 为必填   lable=用户名   //{0}arg0为参数

备注:正则表达式:

*

匹配0或多次,对邻近一个()起作用

Ab*:a,abb

+

匹配>=1,对邻近一个()起作用

Ab+:ab,abb

?

匹配0或一次, 对邻近一个()起作用

Ab?:a,ab

{n}

匹配指定的次数, 对邻近一个()起作用

Ab{2}c:abbc,aabbc

{n,m}

匹配从nm, 对邻近一个()起作用

Ab{2,3}c:abbc,abbbc

^(也表示字符串头)

不想匹配的字符,一般和[]一起

A[^b]c:adc,aec

$(字符串结束位置)

^\w+$:为一个或多个数字,字母

^\d{8}\d*$:只能8位数字

表示一个范围

[09]:0,1…9

\d

等价于[09]表示一个数字

\da:1a,2a

\D

等价于[^09],不能为数字

\Da:aa,da

\w

等价于[AZ09]匹配单个数字或字母

\wa:1a,va

\W

等价于[^AZ09]不匹配单个数字或字母

\Wa:!a,#a

\

转义字符

\.表示.




8
STRUTS国际化:

a.全部设为UTF-8编码:<%@ page language="java" contentType="text/html;charset=UTF-8" %>

b.bat文件: native2ascii –encoding gb2312 ori.properties target.properties



9.
存放常量共享数据:

  a.存放常量的java文件:public final class Constants{

public static final String PERSON_KEY=”personbean”;}

  b.Action中保存数据:request.setAttribute(Constants.PERSON_KEY,class);

  c.在页面输出:<logic:present name="personbean" scope="request" >

               <bean:write name="personbean"  property="userName"/></logic:present>



10
.输出下拉菜单组:<jsp:useBean id="groupDao" class="mypack.GroupDao" scope="page"/>

                   <c:set var="groups" value="${groupDao.groups}" />  //get方法

<td><html:select property="groupId">  //读取数据库中的groupName属性

<html:options collection="groups" property="groupId" labelProperty="groupName" />

</html:select></td>




11
Struts内置对象


aforwardAction:(请求—ActionForm—Action—ActionForm—响应)

页面:<html:form action="/forward"><html:text property="userName"/> <html:submit/>

配置:<action  input="/hello.jsp"   name="forwardForm"

       path="/forward" parameter="/forward.jsp"      scope="request"

       type="org.apache.struts.actions.ForwardAction">    </action>

输出:${forwardForm.userName}//在配置中的<form-beans >实例化

bDispatchAction(用于不同的表单响应同一个Action

页面:<html:form action="/personManager" >

      <html:hidden  property="method" value="addPerson" />

      <html:text  property="person.password"  />

      <html:submit value="add"/> </html:form>

     <html:form action="/personManager" >

      <html:text  property="person.password" />

     <html:submit property="method" value="updatePerson"/>  </html:form>

配置:<action path="/personManager"

       type="mypack.struts.action.MyDispatchAction" //继承DispatchAction

       parameter="method"   name="forward2Form"    scope="request"

       input="/dispatch.jsp"  >

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

<action>中根据value自动映射:public ActionForward addPerson(){ }

                      public ActionForward updatePerson( ){ }

输出:${forward2Form.person.password }

备注:DispatchAction参数根据表单中的property映射,具体值由value传入。

 

cLookupDispatchAction(同一个表单不同的触发事件)

页面:<html:form action="/personManager2">

      <html:text property="person.password"  />

      <html:submit property="action"   value="addPerson" />

      <html:submit property="action">

      <bean:message key="button.update.person" />   </html:submit> </html:form>

配置:<action path="/personManager2"   parameter="action"

      type="mypack.struts.action.MyLookupDispatch"

      name="forward2Form"    scope="request"    input="/dispatch.jsp"  >

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

资源文件:button.add.person=addPerson    button.update.person=updatePerson

 

Action(重写父类LookupDispatchAction抽象方法): protected Map getKeyMethodMap() {

        Map map=new HashMap();   map.put("button.add.person", "addPerson");

        map.put("button.update.person", "updatePerson");       return map;  }

public ActionForward addPerson(){ }

public ActionForward updatePerson( ){ request.setAttribute("ok", "update"); }

输出:${ok }

备注:LookupDispatchAction的映射由getKeyMethodMap方法建立,具体值也由value传入

posted on 2007-07-16 12:56 mrklmxy 阅读(1154) 评论(0)  编辑  收藏


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