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APACHE Geronimo 试用之JDBC

1、通过控制台创建相应的数据库，PICTURES表以及数据库连接池：
其中表的创建语句如下：
create table pictures(name varchar(32) not null primary key, pic blob(16M));
更多具体内容请参考：http://cwiki.apache.org/GMOxDOC21/web-application-for-jdbc-access.html

2、实现图片上传：
package jdbc;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

public class ImageUpload extends javax.servlet.http.HttpServlet implements
        javax.servlet.Servlet {
    @Resource(name = "jdbc/usersds")
    private DataSource ds;
    static final long serialVersionUID = 1L;

    public ImageUpload() {
        super();
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }

    protected void doProcess(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        Connection dbconnect = null;
        PreparedStatement stmnt = null;
        String pic = request.getParameter("ImageLoc");
        String name = request.getParameter("ImageName");
        try {
            File f = new File(pic);
            FileInputStream fis = new FileInputStream(f);
            dbconnect = ds.getConnection();
            stmnt = dbconnect.prepareStatement("INSERT INTO PICTURES ("
                    + "NAME," + "PIC )" + " VALUES(?,?)");
            stmnt.setString(1, name);
            stmnt.setBinaryStream(2, fis, (int) f.length());
            stmnt.execute();
            PrintWriter out = response.getWriter();
            out.println("<html>");
            out.println("<body>");
            out
                    .println("Congratulations your image has been successfully uploaded");
            String html = "<a href='/WebJDBC/ImageDownload?ImageName=" + name
                    + ">view the image</a>";
            out.println(html);
            out.println("</body>");
            out.println("</html>");

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                dbconnect.close();
                stmnt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }
}

3、实现图片下载：
package jdbc;

import java.io.IOException;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

public class ImageDownload extends javax.servlet.http.HttpServlet implements
        javax.servlet.Servlet {
    @Resource(name = "jdbc/usersds")
    private DataSource ds;
    static final long serialVersionUID = 1L;

    public ImageDownload() {
        super();
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }

    protected void doProcess(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        Connection dbconnect = null;
        ResultSet rs = null;
        PreparedStatement stmnt = null;
        try {
            dbconnect = ds.getConnection();
            String s = request.getParameter("ImageName");
            stmnt = dbconnect
                    .prepareStatement("SELECT PIC FROM PICTURES WHERE NAME=?");
            stmnt.setString(1, s);
            rs = stmnt.executeQuery();
            if (rs.next()) {
                // Get as a BLOB
                Blob aBlob = rs.getBlob(1);
                byte[] b = new byte[4096];
                java.io.InputStream ip = aBlob.getBinaryStream();
                OutputStream out = null;
                int c = 0;
                out = response.getOutputStream();
                response.setContentType("image/jpeg");
                while (c != -1) {
                    c = ip.read(b);
                    out.write(b);
                    out.flush();
                }
                ip.close();

            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                dbconnect.close();
                stmnt.close();
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }
}

4、图片上传JSP页面：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Image Upload</title>
</head>
<body>
<h2>Select a Image and Upload it</h2>
<form action="/WebJDBC/ImageUpload">
<table>
    <tr>
        <td>Location of the Image(full path)</td>
        <td><Input type="text" name="ImageLoc"></td>
    </tr>
    <tr>
        <td>Name of the Image(Unique Name)</td>
        <td><Input type="text" name="ImageName"></td>
    </tr>
    <tr>
        <td><Input type="submit" value="submit"></td>
    <tr>
</table>
</form>
</body>
</html>

5、图片下载JSP页面：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Download Image</title>
</head>
<body>
<h2>Name a Image to download</h2>
<form action="/WebJDBC/ImageDownload">
<table>
<tr>
<td>
Name of the Image
</td>
<td>
<Input type="text" name="ImageName">
</td>
</tr>
<tr>
<td>
<Input type="submit" value="submit">
</td>
<tr>
</table>
</form>
</body>
</html>

6、geronimo-web.xml的配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://geronimo.apache.org/xml/ns/j2ee/web-2.0.1"
    xmlns:nam="http://geronimo.apache.org/xml/ns/naming-1.2" 
    xmlns:sec="http://geronimo.apache.org/xml/ns/security-2.0"
    xmlns:sys="http://geronimo.apache.org/xml/ns/deployment-1.2">
    <sys:environment>
        <sys:moduleId>
            <sys:groupId>default</sys:groupId>
            <sys:artifactId>WebJDBC</sys:artifactId>
            <sys:version>1.0</sys:version>
            <sys:type>car</sys:type>
        </sys:moduleId>
        <sys:dependencies>
            <sys:dependency>
                <sys:groupId>console.dbpool</sys:groupId>
                <sys:artifactId>jdbc_usersds</sys:artifactId>
            </sys:dependency>
        </sys:dependencies>
    </sys:environment>
    <context-root>/WebJDBC</context-root>
    <nam:resource-ref>
        <nam:ref-name>jdbc/usersds</nam:ref-name>
        <nam:pattern>
            <nam:groupId>console.dbpool</nam:groupId>
            <nam:artifactId>jdbc_usersds</nam:artifactId>
            <nam:name>jdbc/usersds</nam:name>
        </nam:pattern>
    </nam:resource-ref>
</web-app>

7、WEB.XML文件的配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>WebJDBC</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <servlet>
        <description></description>
        <display-name>ImageUpload</display-name>
        <servlet-name>ImageUpload</servlet-name>
        <servlet-class>jdbc.ImageUpload</servlet-class>
    </servlet>
    <servlet>
        <description></description>
        <display-name>ImageDownload</display-name>
        <servlet-name>ImageDownload</servlet-name>
        <servlet-class>jdbc.ImageDownload</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ImageUpload</servlet-name>
        <url-pattern>/ImageUpload</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ImageDownload</servlet-name>
        <url-pattern>/ImageDownload</url-pattern>
    </servlet-mapping>
</web-app>

8、发布及测试：
将应用打包成WebJDBC.war，发布之后通过访问http://localhost:8080/WebJDBC/即可看到程序运行效果，附件请点击此处下载http://www.blogjava.net/Files/kinkding/WebJDBC.rar

posted on 2009-05-12 21:53 俊星 阅读(166) 评论(0)  编辑  收藏


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