Flex与java交互之数据库数据读取-优快云博客

本文介绍如何使用Flex与Java进行整合开发，通过具体实例演示了从数据库连接到数据展示的全过程。包括Java端的数据库操作代码、Flex端的数据获取及显示代码。

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对于建立一个flex web应用的步骤我就不多说了哈。

首先要求大家到数据库建立一个数据库，在我这例子中数据库名为userDb，建立一个表userInfo，里面设置两个字段一个为id，一个为name.第二，创建以下java代码在src目录下

User.java

package org.rjb.java;

public class User {

private Stringname;

public StringgetName() {

return name;

}

public void setName(Stringname) {

this .name = name;

}

UserDao.java

package org.rjb.java;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

public class UserDao {

public static ConnectiongetConnection() {

Connectionc = null ;

try {

Stringdriver = " com.mysql.jdbc.Driver " ;

Stringurl = " jdbc:mysql://localhost:3306/userDb " ;

Stringusername = " root " ;

Stringpassword = " 1235 " ;

Class.forName(driver);

c = DriverManager.getConnection(url,username,password);

} catch (Exceptione) {

System.out.println(e.getMessage());

}

return c;

}

public ListgetAllUser() throws SQLException {

Connectionc = getConnection();

Statementst = c.createStatement();

ResultSetrs = st.executeQuery( " select*fromUserInfo " );

ArrayListuserList = new ArrayList < User > ();

while (rs.next()) {

Useru = new User();

u.setName(rs.getString( " name " ));

userList.add(u);

}

return userList;

}

以上是java端的全部代码了，下面是flex端的代码。

第三，创建以下代码在flex_src下：

User.as

package org.rjb.flex

{

[RemoteClass(alias = " org.rjb.java.User " )]

public class User

{

private var_name:String;

public functionUser()

{

}

public functiongetname():String {

return this ._name;

}

public functionsetname(name:String): void {

this ._name = name;

}

User.as

package org.rjb.flex

{

[RemoteClass(alias = " org.rjb.java.User " )]

public class User

{

private var_name:String;

public functionUser()

{

}

public functiongetname():String {

return this ._name;

}

public functionsetname(name:String): void {

this ._name = name;

}

接下来是mxml代码，也就是我们真正展示我们数据的界面

FlexWithJava .mxml

<? xmlversion="1.0"encoding="utf-8" ?>

< mx:Application xmlns:mx ="http://www.adobe.com/2006/mxml" layout ="vertical" >

< mx:RemoteObject id ="ud" destination ="UserDao" result ="onResult(event)" fault ="onFault()" />

< mx:DataGrid dataProvider ="{users}" >

< mx:columns >

< mx:DataGridColumn dataField ="name" headerText ="name" />

</ mx:columns >

</ mx:DataGrid >

< mx:Label id ="info" />

< mx:Button label ="click" click ="clickFun()" />

< mx:Script >

<![CDATA[

importmx.collections.ArrayCollection;

importmx.rpc.events.ResultEvent;

[Bindable]

publicvarusers:ArrayCollection=newArrayCollection();

publicfunctionclickFun():void{

ud.getAllUser();

}

publicfunctiononResult(event:ResultEvent):void{

users=ArrayCollection(event.result);

info.text="getdatasuccessfully";

}

publicfunctiononFault():void{

info.text="Error";

}

]]>

</ mx:Script >

</ mx:Application >

第四，配置remoting-config.xml，在里面加上如下配置文件：

< destination id ="UserDao" >
< properties >
< source > org.rjb.java.UserDao </ source >
</ properties >
</ destination >