Flex 3通过Servlet连接数据库

      <?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
     creationComplete="feedRequest.send()" >
   <mx:HTTPService id="feedRequest"
       url="http://localhost:8080/flexweb/HelloWorld"
       useProxy="false" />
    <mx:Panel x="10" y="10" width="475" height="400" layout="absolute"
        title="{dgPosts.selectedItem.name}" color="#1C06F6" fontSize="16">
    <mx:DataGrid x="20" y="20" id="dgPosts" width="400" dataProvider="{feedRequest.lastResult.songs.song}" fontFamily="Times New Roman" fontSize="16">
       <mx:columns>
         <mx:DataGridColumn headerText="Name" dataField="name"/>
         <mx:DataGridColumn headerText="Singer" dataField="singer"/>
         <mx:DataGridColumn headerText="URL" dataField="addrURL"/>
       </mx:columns>
    </mx:DataGrid>
    <mx:LinkButton x="20" y="225" label="下载音乐" click="navigateToURL(new URLRequest(dgPosts.selectedItem.addrURL));" fontFamily="Times New Roman" fontSize="20" color="#0B3C0B"/>
    <mx:TextArea x="20" y="175" width="400" text="{dgPosts.selectedItem.lrc}" fontFamily="Times New Roman" fontSize="16"/>
   </mx:Panel>
</mx:Application>
    

保存文件，编译执行。此刻由于没有部署本地服务器来执行 http://localhost:8080/flexweb/HelloWorld

所以会出现错误信息，不要紧，我们开始搭建servlet.

servlet的具体代码如下: HelloWorld.java

      package test;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet {
    public static String dbDriver ="sun.jdbc.odbc.JdbcOdbcDriver";
    public String connStr ="jdbc:odbc:songs";
    public ResultSet rs =null;
    public Connection con=null;
    public Statement st=null;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{

        response.setContentType("text/xml;charset=utf-8");
        response.setHeader("Cache-Control", "no-cache");
        String content = "";
        String name="";
        String singer="";
        String lrc="";
        String addrURL="";
        try{
        Connection condb = getConnection();
        st = condb.createStatement();
        rs=st.executeQuery("select * from songs");
        while(rs.next()){
            name = rs.getString("name");
            singer = rs.getString("singer");
            lrc = rs.getString("lrc");
            addrURL = rs.getString("url");
            content+="<song><name>"+name+"</name><singer>"+singer+"</singer><lrc>"+
             lrc+"</lrc><addrURL>"+addrURL+"</addrURL></song>";
        }
        }catch(ClassNotFoundException e){
            e.printStackTrace();
        }catch( SQLException e1){
            e1.printStackTrace();
        }
        content="<?xml version=/"1.0/" encoding=/"utf-8/"?><songs>"+content;
        content+="</songs>";

        
      
        system
      
      .out.println(content);
        response.getWriter().write(content);
    }
    public Connection getConnection() throws ClassNotFoundException{
        try{
            Class.forName(dbDriver);
            
      
        system
      
      .out.println("Connect to db successfuly!");
            con = DriverManager.getConnection(connStr);
            
        }catch(SQLException e){
            con=null;
            
      
        system
      
      .err.println(e.getMessage());
        }
        return con;
    }
}
    

如果部署程序有问题的话，可以留言交流。

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