flex与java实现增删改查

用的是MySQL数据库。

1，建一个userdb库，再建userinfo表，字 段：id(int),username(varchar),password(varchar)。

  1. create database userdb;  
  2. use userdb;  
  3. create table userinfo(  
  4. id int(10) not null auto_increment,  
  5. username varchar(20),  
  6. password varchar(20),  
  7. primary key(id));  

2，DBConnection.java

  1. package com.datainfo;  
  2.   
  3. import java.sql.Connection;  
  4. import java.sql.DriverManager;  
  5. import java.sql.SQLException;  
  6.   
  7. public class DBConnection {  
  8.     public static Connection getConnection() throws ClassNotFoundException,  
  9.             SQLException {  
  10.         Connection conn = null;  
  11.         String driver = "com.mysql.jdbc.Driver";  
  12.         String url = "jdbc:mysql://localhost:3306/userdb";  
  13.         String username = "root";  
  14.         String password = "mysql";  
  15.         Class.forName(driver);  
  16.         conn = DriverManager.getConnection(url, username, password);  
  17.         return conn;  
  18.     }  
  19. }  

3，User.java

  1. package com.datainfo;  
  2.   
  3. public class User {  
  4.     private int id;  
  5.     private String username;  
  6.     private String password;  
  7.   
  8.     public User() {  
  9.           
  10.     }  
  11.   
  12.     /** 
  13.      * @return the id 
  14.      */  
  15.     public int getId() {  
  16.         return id;  
  17.     }  
  18.   
  19.     /** 
  20.      * @param id 
  21.      *            the id to set 
  22.      */  
  23.     public void setId(int id) {  
  24.         this.id = id;  
  25.     }  
  26.   
  27.     /** 
  28.      * @return the username 
  29.      */  
  30.     public String getUsername() {  
  31.         return username;  
  32.     }  
  33.   
  34.     /** 
  35.      * @param username 
  36.      *            the username to set 
  37.      */  
  38.     public void setUsername(String username) {  
  39.         this.username = username;  
  40.     }  
  41.   
  42.     /** 
  43.      * @return the password 
  44.      */  
  45.     public String getPassword() {  
  46.         return password;  
  47.     }  
  48.   
  49.     /** 
  50.      * @param password 
  51.      *            the password to set 
  52.      */  
  53.     public void setPassword(String password) {  
  54.         this.password = password;  
  55.     }  
  56. }  

4，UserDAO.java

  1. package com.datainfo;  
  2.   
  3. import java.sql.Connection;  
  4. import java.sql.PreparedStatement;  
  5. import java.sql.ResultSet;  
  6. import java.sql.SQLException;  
  7. import java.sql.Statement;  
  8. import java.util.ArrayList;  
  9.   
  10. import com.datainfo.DBConnection;  
  11.   
  12. public class UserDAO {  
  13.     public ArrayList getUserList() throws ClassNotFoundException, SQLException {  
  14.         Connection conn = DBConnection.getConnection();  
  15.         Statement stmt = conn.createStatement();  
  16.         ResultSet rs = stmt.executeQuery("select * from userinfo");  
  17.         ArrayList userList = null;  
  18.         try {  
  19.             userList = new ArrayList();  
  20.             while (rs.next()) {  
  21.                 User user = new User();  
  22.                 user.setId(rs.getInt("id"));  
  23.                 user.setUsername(rs.getString("username"));  
  24.                 user.setPassword(rs.getString("password"));  
  25.                 userList.add(user);  
  26.             }  
  27.             rs.close();  
  28.             stmt.close();  
  29.             conn.close();  
  30.         } catch (Exception e) {  
  31.             // TODO Auto-generated catch block  
  32.             e.printStackTrace();  
  33.         }  
  34.         return userList;  
  35.     }  
  36.   
  37.     public void addUser(User user) throws ClassNotFoundException, SQLException {  
  38.         Connection conn = DBConnection.getConnection();  
  39.         String sql = "insert into userinfo (username,password) values (?,?)";  
  40.         try {  
  41.             PreparedStatement pstmt = conn.prepareStatement(sql);  
  42.             pstmt.setString(1, user.getUsername());  
  43.             pstmt.setString(2, user.getPassword());  
  44.             pstmt.executeUpdate();  
  45.             pstmt.close();  
  46.             conn.close();  
  47.         } catch (Exception e) {  
  48.             // TODO Auto-generated catch block  
  49.             e.printStackTrace();  
  50.         }  
  51.     }  
  52.   
  53.     public void updataUser(User user) throws ClassNotFoundException,  
  54.             SQLException {  
  55.         Connection conn = DBConnection.getConnection();  
  56.         String sql = "update userinfo set username=?,password=? where id=?";  
  57.         try {  
  58.             PreparedStatement pstmt = conn.prepareStatement(sql);  
  59.             pstmt.setString(1, user.getUsername());  
  60.             pstmt.setString(2, user.getPassword());  
  61.             pstmt.setInt(3, user.getId());  
  62.             pstmt.executeUpdate();  
  63.             pstmt.close();  
  64.             conn.close();  
  65.         } catch (Exception e) {  
  66.             // TODO Auto-generated catch block  
  67.             e.printStackTrace();  
  68.         }  
  69.     }  
  70.   
  71.     public void deleteUser(User user) throws ClassNotFoundException,  
  72.             SQLException {  
  73.         Connection conn = DBConnection.getConnection();  
  74.         String sql = "delete from userinfo where id =?";  
  75.         try {  
  76.             PreparedStatement pstmt = conn.prepareStatement(sql);  
  77.             pstmt.setInt(1, user.getId());  
  78.             pstmt.executeUpdate();  
  79.             pstmt.close();  
  80.             conn.close();  
  81.         } catch (Exception e) {  
  82.             // TODO Auto-generated catch block  
  83.             e.printStackTrace();  
  84.         }  
  85.     }  
  86. }  

5，配置文件remoting-config.xml

  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <service id="remoting-service" class="flex.messaging.services.RemotingService">  
  3.   
  4.     <adapters>  
  5.         <adapter-definition id="java-object"  
  6.             class="flex.messaging.services.remoting.adapters.JavaAdapter"  
  7.             default="true" />  
  8.     </adapters>  
  9.   
  10.     <default-channels>  
  11.         <channel ref="my-amf" />  
  12.     </default-channels>  
  13.   
  14.     <destination id="userDao">  
  15.         <properties>  
  16.             <source>com.datainfo.UserDAO</source>  
  17.         </properties>  
  18.     </destination>  
  19. </service>  

6，以下是flex端，UserFlex.as

  1. package com.flex  
  2. {  
  3.     [Bindable]  
  4.     [RemoteClass(alias="com.datainfo.User")]  
  5.     public class UserFlex  
  6.     {  
  7. //      public function UserFlex{  
  8. //            
  9. //      }  
  10.         public var id:int;  
  11.         public var username:String;  
  12.         public var password:String;  
  13. //      如果用private，就需要写上get/set  
  14. //        
  15. //      public function get id():int{  
  16. //          return this.id;  
  17. //      }  
  18. //      public function set id():int{  
  19. //          this.id = id;  
  20. //      }  
  21. //        
  22. //      public function get username():String{  
  23. //          return this.username;  
  24. //      }  
  25. //      public function set username():String{  
  26. //          this.username = username;  
  27. //      }  
  28. //        
  29. //      public function get password():String{  
  30. //          return this.password;  
  31. //      }  
  32. //      public function set password():String{  
  33. //          this.password = password;  
  34. //      }  
  35.     }  
  36. }  

7，自定义的DataGrid组件，用以双击修改数据DoubleClickDataGrid.as

  1. package com.flex  
  2. {  
  3.     import flash.events.MouseEvent;  
  4.     import mx.controls.DataGrid;  
  5.     import mx.controls.dataGridClasses.DataGridColumn;  
  6.     import mx.controls.listClasses.IDropInListItemRenderer;  
  7.     import mx.controls.listClasses.IListItemRenderer;  
  8.     import mx.core.EventPriority;  
  9.     import mx.events.DataGridEvent;  
  10.       
  11.       
  12.     public class DoubleClickDataGrid extends DataGrid  
  13.     {  
  14.         public function DoubleClickDataGrid()  
  15.         {  
  16.             //TODO: implement function  
  17.             super();  
  18.             doubleClickEnabled = true;  
  19.         }  
  20.         override protected function mouseDoubleClickHandler(event:MouseEvent):void  
  21.         {  
  22.             var dataGridEvent:DataGridEvent;  
  23.             var r:IListItemRenderer;  
  24.             var dgColumn:DataGridColumn;  
  25.               
  26.             r = mouseEventToItemRenderer(event);  
  27.             if (r && r != itemEditorInstance)  
  28.             {  
  29.                 var dilr:IDropInListItemRenderer = IDropInListItemRenderer(r);  
  30.                 if (columns[dilr.listData.columnIndex].editable)  
  31.                 {  
  32.                     dgColumn = columns[dilr.listData.columnIndex];  
  33.                     dataGridEvent = new DataGridEvent(DataGridEvent.ITEM_EDIT_BEGINNING, false, true);  
  34.                     // ITEM_EDIT events are cancelable  
  35.                       
  36.                     dataGridEvent.columnIndex = dilr.listData.columnIndex;  
  37.                     dataGridEvent.dataField = dgColumn.dataField;  
  38.                     dataGridEvent.rowIndex = dilr.listData.rowIndex + verticalScrollPosition;  
  39.                     dataGridEvent.itemRenderer = r;  
  40.                     dispatchEvent(dataGridEvent);  
  41.                 }  
  42.             }  
  43.               
  44.             super.mouseDoubleClickHandler(event);  
  45.         }  
  46.           
  47.         override protected function mouseUpHandler(event:MouseEvent):void  
  48.         {  
  49.             var r:IListItemRenderer;  
  50.             var dgColumn:DataGridColumn;  
  51.               
  52.             r = mouseEventToItemRenderer(event);  
  53.             if (r)  
  54.             {  
  55.                 var dilr:IDropInListItemRenderer = IDropInListItemRenderer(r);  
  56.                 if (columns[dilr.listData.columnIndex].editable)  
  57.                 {  
  58.                     dgColumn = columns[dilr.listData.columnIndex];  
  59.                     dgColumn.editable = false;  
  60.                 }  
  61.             }  
  62.               
  63.             super.mouseUpHandler(event);  
  64.               
  65.             if (dgColumn)  
  66.                 dgColumn.editable = true;  
  67.         }  
  68.           
  69.     }  
  70. }  

8，页面显示，testflex.mxml

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"   
  3.                xmlns:s="library://ns.adobe.com/flex/spark"   
  4.                xmlns:mx="library://ns.adobe.com/flex/mx"   
  5.                xmlns:locdg="com.flex.*"  
  6.                creationComplete="initApp()"  
  7.                minWidth="955" minHeight="600">  
  8.     <fx:Declarations>  
  9.         <!-- 将非可视元素（例如服务、值对象）放在此处 -->  
  10.         <s:RemoteObject id="userdata" destination="userDao" result="onResult(event)" fault="onFault(event)" />  
  11.         <!--<s:method name="getUserList" result="onResult(event)" fault="onFault(event)" />-->  
  12.         <s:RemoteObject id="adduserdata" destination="userDao" result="addResult(event)" fault="addFault(event)" />  
  13.         <s:RemoteObject id="updatauserdata" destination="userDao" result="updataResult(event)" fault="updataFault(event)" />  
  14.         <s:RemoteObject id="deleteuserdata" destination="userDao" result="deleteResult(event)" fault="deleteFault(event)" />  
  15.     </fx:Declarations>  
  16.     <fx:Script>  
  17.         <!--[CDATA[  
  18.             import com.flex.UserFlex;  
  19.               
  20.             import mx.collections.ArrayCollection;  
  21.             import mx.controls.Alert;  
  22.             import mx.managers.CursorManager;  
  23.             import mx.rpc.events.FaultEvent;  
  24.             import mx.rpc.events.ResultEvent;  
  25.               
  26.             public var userFlex:UserFlex = new UserFlex();  
  27.             public var result:Object = new Object();  
  28.             [Bindable]  
  29.             public var users:ArrayCollection = new ArrayCollection();  
  30.               
  31.             public function initApp():void{  
  32. //              userdata.getUserList();  
  33.             }  
  34.               
  35.             public function click_handler(event:Event):void{  
  36.                 CursorManager.setBusyCursor();  
  37.                 info.text = "正在查 询...";  
  38.                 userdata.getUserList();  
  39.             }  
  40.             public function adduser_handler(event:Event):void{  
  41.                 if(username.text != "" && password.text != ""){  
  42.                     CursorManager.setBusyCursor();  
  43.                     addinfo.text = "正在添加...";  
  44.                     userFlex.username = username.text;  
  45.                     userFlex.password = password.text;  
  46.                     adduserdata.addUser(userFlex);  
  47.                 }else{  
  48.                     addinfo.text = " 用户名和密码不能为空";  
  49.                 }  
  50.             }  
  51.             public function updataUser(event:Event):void{  
  52.                 if(userlist.selectedItem.username != "" && userlist.selectedItem.password != ""){  
  53.                     CursorManager.setBusyCursor();  
  54.                     info.text = "正在 更新...";  
  55.                     userFlex.id = userlist.selectedItem.id;  
  56.                     userFlex.username = userlist.selectedItem.username;  
  57.                     userFlex.password = userlist.selectedItem.password;  
  58.                     updatauserdata.updataUser(userFlex);  
  59.                 }  
  60. //              Alert.show("确认修改？");  
  61.             }  
  62.             public function deleteUser(event:Event):void{  
  63.                 CursorManager.setBusyCursor();  
  64.                 info.text = "正在正在删 除...";  
  65.                 userFlex.id = userlist.selectedItem.id;  
  66.                 deleteuserdata.deleteUser(userFlex);  
  67.             }  
  68.               
  69.             public function onResult(event:ResultEvent):void{  
  70.                 users = event.result as ArrayCollection;  
  71.                 CursorManager.removeBusyCursor();  
  72.                 if(users.length==0){  
  73.                     info.text="取数据成功，为空";  
  74.                 }else{  
  75.                     info.text = " 取数据成功";  
  76.                 }  
  77.             }  
  78.             public function onFault(event:FaultEvent):void{  
  79.                 CursorManager.removeBusyCursor();  
  80.                 info.text="取数据失败";  
  81.             }  
  82.             public function addResult(event:ResultEvent):void{  
  83.                 CursorManager.removeBusyCursor();  
  84.                 userdata.getUserList();  
  85.                 username.text = "";  
  86.                 password.text = "";  
  87.                 addinfo.text = " 添加成功";  
  88.                 //              info.text = "取数据成功";  
  89.             }  
  90.             public function addFault(event:FaultEvent):void{  
  91.                 CursorManager.removeBusyCursor();  
  92.                 addinfo.text="添加失败";  
  93.             }  
  94.             public function updataResult(event:ResultEvent):void{  
  95.                 CursorManager.removeBusyCursor();  
  96.                 userdata.getUserList();  
  97.                 info.text = "修改数 据成功";  
  98.             }  
  99.             public function updataFault(event:FaultEvent):void{  
  100.                 CursorManager.removeBusyCursor();  
  101.                 info.text="修改数据失 败";  
  102.             }  
  103.             public function deleteResult(event:ResultEvent):void{  
  104.                 CursorManager.removeBusyCursor();  
  105.                 userdata.getUserList();  
  106.                 info.text = "刪除数据成 功";  
  107.             }  
  108.             public function deleteFault(event:FaultEvent):void{  
  109.                 CursorManager.removeBusyCursor();  
  110.                 info.text="刪除数据失败";  
  111.             }  
  112.         ]]-->  
  113.     </fx:Script>  
  114.     <locdg:DoubleClickDataGrid x="61" y="189" id="userlist" dataProvider="{users}" editable="true">  
  115.         <locdg:columns>  
  116.             <mx:DataGridColumn headerText="ID号" dataField="id" editable="false"/>  
  117.             <mx:DataGridColumn headerText="账号" dataField="username" editable="true"/>  
  118.             <mx:DataGridColumn headerText="密码" dataField="password" editable="true"/>  
  119.             <mx:DataGridColumn headerText="修改" width="50" editable="false" >  
  120.                 <mx:itemRenderer>  
  121.                     <fx:Component>  
  122.                         <mx:LinkButton toolTip="修改" click="outerDocument.updataUser(event)" icon="@Embed('/image/update.gif')">  
  123.                         </mx:LinkButton>  
  124.                     </fx:Component>  
  125.                 </mx:itemRenderer>  
  126.             </mx:DataGridColumn>  
  127.             <mx:DataGridColumn headerText="删除" width="50" editable="false" >  
  128.                 <mx:itemRenderer>  
  129.                     <fx:Component>  
  130.                         <mx:LinkButton toolTip="删除" click="outerDocument.deleteUser(event)" icon="@Embed('/image/delete.gif')">     
  131.                         </mx:LinkButton>  
  132.                     </fx:Component>  
  133.                 </mx:itemRenderer>  
  134.             </mx:DataGridColumn>  
  135.         </locdg:columns>  
  136.     </locdg:DoubleClickDataGrid>  
  137.     <s:Button x="491" y="189" label="取数 据" click="click_handler(event)" />  
  138.     <s:RichText x="606" y="189" id="info" text="点击按钮取数据"/>  
  139.     <mx:Form x="163" y="72" borderStyle="solid" borderVisible="true">  
  140.         <mx:FormItem label="用户名" borderStyle="solid" borderVisible="true">  
  141.             <s:TextInput id="username" />  
  142.         </mx:FormItem>  
  143.         <mx:FormItem label="密 码" borderStyle="solid" borderVisible="true">  
  144.             <s:TextInput id="password"/>  
  145.         </mx:FormItem>  
  146.     </mx:Form>  
  147.     <s:Button x="444" y="100" label="添 加" click="adduser_handler(event)"/>  
  148.     <s:RichText x="544" y="100" id="addinfo" text="请添加"/>  
  149. </s:Application>  

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原文地址：https://www.cnblogs.com/nianshi/p/1732440.html