flex与java间用json传输数据

flex与java间用json传输数据

1.从java到flex,将一个map或对象/自定义对象转为String,这里用HttpServlet

java端

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

   response.setContentType("text/html");

   PrintWriter out = response.getWriter();

  

   Map map = new HashMap<String, Object>();

   map.put("name", "wxj");

   map.put("age", 20);

   map.put("tall", "163");

  

   //将一个map转换为一个JSON对象

   JSONObject object = JSONObject.fromObject(map);

   System.out.println("json object: " + object);

  

   out.println(object);

   out.flush();

   out.close();

  

}

flex端

<mx:HTTPService id="testjson" url="http://localhost:8080/fsh2/servlet/TestJsonServlet" method="POST" result="jsonResult(event)"/>

public function jsonResult(event:ResultEvent):void{

     var person:Object = JSON.decode(testjson.lastResult.toString());

     json1.text = person.name + "," + person.age + "," + person.tall;

    

}

2.从java到flex,将一个map或自定义对象转为String,这里用RemoteObject

java端

/**

* 将一个map或对象转为String

* @param id

* @return

*/

public String getUser(int id){

   Map map = new HashMap<String, Object>();

   if(id == 1){

    map.put("name", "wxj");

    map.put("age", 20);

    map.put("tall", "163");

    return JSONObject.fromObject(map).toString();

   }else {

    User user = new User();

    user.setId(100);

    user.setUserName("中国");

    user.setPwd("哈哈...");

    return JSONObject.fromObject(user).toString();

   }

  

flex端

<mx:RemoteObject id="userRO" destination="UserServer" >

   <mx:method name="getUser" result="userResult(event)"/>

</mx:RemoteObject>

   public function userResult(event:ResultEvent):void{

     var person:Object = JSON.decode(event.result.toString());

     json2.text = person.id + "," + person.userName + "," + person.pwd;

   }

  

3.从java到flex,将一个List转换为String,这里用RemoteObject

java端

/**

* 将一个List转换为String返回

* @return

*/

public String getUsers(){

   List<User> userList = new ArrayList<User>();

  

   User user1 = new User();

   user1.setId(1);

   user1.setUserName("wxj");

   user1.setPwd("wxj1111");

   userList.add(user1);

  

   User user2 = new User();

   user2.setId(1);

   user2.setUserName("zs");

   user2.setPwd("zs23222");

   userList.add(user2);

  

   User user3 = new User();

   user3.setId(1);

   user3.setUserName("ls");

   user3.setPwd("lisi12312");

   userList.add(user3);

  

   return JSONArray.fromObject(userList).toString();

}

flex端

<mx:RemoteObject id="userRO" destination="UserServer" >

   <mx:method name="getUsers" result="usersResult(event)"/>

</mx:RemoteObject>

public function usersResult(event:ResultEvent):void{

       //先转换为数组

     var acc:Array = JSON.decode(event.result.toString()) as Array;

     //dg是一个DataGrid

     dg.dataProvider = new ArrayCollection(acc);

}

   

   

4.从flex到java

flex端

<mx:RemoteObject id="userRO" destination="UserServer" >

   <mx:method name="addUser" result="addUserResult(event)"/>

</mx:RemoteObject>

    /**

    * 添加用户

    */ 

    public function addUser():void{

     var user:Object = {};

     user.userName = userName.text;

     user.pwd = pwd.text;

     var json:String = JSON.encode(user);

     userRO.addUser(json);

    }

   

    /**

    *用户列表

    */

    public function addUserResult(event:ResultEvent):void{

     dg2.dataProvider = new ArrayCollection(JSON.decode(event.result.toString()) as Array);

    }

   

    java端

   /**

    * 添加用户

    */

    public String addUser(String json){

      JSONObject data = JSONObject.fromObject(json);

      User user = (User)JSONObject.toBean(data, User.class);

      //System.out.println(data.get("userName"));

      //System.out.println(data.get("pwd"));

      List<User> userList = new ArrayList<User>();

      user.setId(10);

      userList.add(user);

      return JSONArray.fromObject(userList).toString();

    }