Flex Collection的处理方法

Flex 对Java端返回Collection的处理方法

对于Java端返回的各种Java类型的对象，Flex中能否有相应的数据类型来映射。处理，尤其是List、Set、Map及POJO对象值。

 

1、java端

HelloWorldService.java

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

public class HelloWorldService {

public String hello(String var1) {

return "hello " + var1;

}

public String world(String var1) {

return "world " + var1;

}

public Map<String,List<String>> getMap() {

ArrayList<String> list1=new ArrayList<String>();

list1.add("value11");

list1.add("value12");

list1.add("value13");

ArrayList<String> list2=new ArrayList<String>();

list2.add("value21");

list2.add("value22");

list2.add("value23");

ArrayList<String> list3=new ArrayList<String>();

list3.add("value31");

list3.add("value32");

list3.add("value33");       

HashMap<String,List<String>> map=new HashMap<String,List<String>>();

map.put("key1", list1);

map.put("key2", list2);

ap.put("key3", list3);       

return map;

}

public ArrayList<Person> getList() {

ArrayList <Person> list=new ArrayList<Person>();

Person p1=new Person();

p1.setName("name1");

p1.setPass("pass1");

Person p2=new Person();

p2.setName("name2");

p2.setPass("pass2");

Person p3=new Person();

p3.setName("name3");

p3.setPass("pass3");

list.add(p1);

list.add(p2);

list.add(p3);

return list;

}

public Set<Person> getSet() {

HashSet<Person>  set=new HashSet<Person>();

Person p1=new Person();

p1.setName("name1");

p1.setPass("pass1");

Person p2=new Person();

p2.setName("name2");

p2.setPass("pass2");

Person p3=new Person();

p3.setName("name3");

p3.setPass("pass3");

set.add(p1);

set.add(p2);

set.add(p3);

return set;

}

}

       Person.java

public class Person {

private String name;

private String pass;

public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPass() {

        return pass;

    }

    public void setPass(String pass) {

        this.pass = pass;

    }

}

      

 

    2、flex端RemoteObject

<mx:RemoteObject destination="test1" id="test1">

<mx:method name="hello" result="sayHelloResult(event)"/>

<mx:method name="world" result="sayWorldResult(event)"/>

<mx:method name="getMap" result="getMapResult(event)"/>

<mx:method name="getList" result="getListResult(event)"/>

<mx:method name="getSet" result="getSetResult(event)"/>

</mx:RemoteObject>

       ActionScript

<mx:Script>

<![CDATA[

    import mx.collections.ArrayCollection;

        import mx.rpc.events.FaultEvent;

        import mx.controls.Alert;

        import mx.rpc.events.ResultEvent;

        import com.yeeach.Person;

        [Bindable]

        public var person:Person;

        [Bindable]

        public var map:ArrayCollection=null;

        function sayHello(event:Event):void

        {

            var inputVar:String=inputStr.text;

            test1.hello(inputVar);

        }

        function sayWorld(event:Event):void

        {

            var inputVar:String=inputStr.text;

            test1.world(inputVar);

        }

        private function sayHelloResult(event:ResultEvent):void

        {

            result.text=event.result.toString();

            Alert.show(event.result.toString(), "返回结果");

        }

        private function sayWorldResult(event:ResultEvent):void

        {

            result.text=event.result.toString();

            Alert.show(event.result.toString(), "返回结果");

        }

        //***************map

        private function getMapResult(event:ResultEvent):void

        {

            for (var key:String in event.result)

            {

                var list:ArrayCollection=event.result[key] as ArrayCollection;

                for (var key1:Object in list)

                {

                    Alert.show("map item key is: " + key + " value is: " + key1);

                }

            }

        }

        private function getList():void

        {

            test1.getList();

        }

        //***************list

        private function getListResult(event:ResultEvent):void

        {

            var ac:ArrayCollection=event.result as ArrayCollection;

            for (var i:int=0; i < ac.length; i++)

            {

                var p1:Person=ac.getItemAt(i) as Person;

                Alert.show("list item name is: " + p1.name+" \n another usage : "+ac.getItemAt(i).name);

            }

        }

        private function getSet():void

        {

            test1.getSet();

        }

        //***************set

        private function getSetResult(event:ResultEvent):void

        {

            var ac:ArrayCollection=event.result as ArrayCollection;

            for (var i:int=0; i < ac.length; i++)

            {

                var p1:Person=ac.getItemAt(i) as Person;

                Alert.show("set item name  is: " + p1.name);

            }

        }           

    ]]>

</mx:Script>

 

       3、总结

       a、JavaBean从Java端返回给Flex，可以通过Flex的Meta Tag [RemoteClass (alias=“”)]来标识服务器端对应的Java的类（一般为POJO对象）。

注意位置，是在class声明前。

    b、Java Collection返回给Flex，都可以通过转化为mx.collections.ArrayCollection来进行处理。

    c、Flex对于服务器端返回的java其他类型的处理，相对简单，可以参考

http://livedocs.adobe.com/flex/3/html/help.html?content=data_access_4.html