基于BlazeDS的Java与Flex的通信

1.? 安装环境：eclipse,tomcat插件,tomcat,blazeds.war。用于部署基于blazeds的项目。

2.? 将blazeds.war 文件导入eclipse，并输入项目名称。

3.? 建立Server端的Java对象，用于完成服务器端的数据和逻辑操作。本例简单构建了一个EmployeeHelper的类用于返回所有雇员的基本信息，并可以根据客户端的查询请求返回某些雇员的详细信息。Java类写在上面导入的工程中的src目录下。

EmployeeHelper.java:

package com.qilin.hammer.blazeds;

import java.util.*;

public class EmployeeHelper {
	
	private String getPhone(){
		Random r = new Random(47);
		String phone="";
		for(int i=0;i<11;i++)
			phone+=String.valueOf(Math.abs(r.nextInt())%10);
		return phone;
	}
	
	/**
	 * Get all the employees basic info
	 * @return
	 */
	public List<Employee> getEmployees(){
		List<Employee> employees = new ArrayList<Employee>();
		employees.add(new Employee("hammer",25,"male","engineer"));
		employees.add(new Employee("jenny",23,"female","engineer"));
		employees.add(new Employee("jacky",27,"engineer"));
		employees.add(new Employee("tracy",28,"manager"));
		//System.out.println((ArrayList<Employee>)employees);
		return employees;
	}
	
	/**
	 * Use map to transfer the anytype object.
	 * Get the detail info of employees queried.
	 * @param employees
	 * @return
	 */
	public ArrayList<EmployeeDetail> getDetails(List<Map<String,Object>> employees){
		System.out.println(employees);
		ArrayList<EmployeeDetail> result = new ArrayList<EmployeeDetail>();
		for(Map<String,Object> map:employees){
			String name = (String)map.get("name");
			int age = (Integer)map.get("age");
			String sex = (String)map.get("sexual");
			String position = (String)map.get("position");
			result.add(new EmployeeDetail(name,age,sex,position,name+"@gmail.com",getPhone(),name+"'s address"));		
		} 
		return result;
	}

}

package com.qilin.hammer.blazeds;
import java.io.Serializable;

public class EmployeeDetail implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String name;
	private int age;
	private String sexual;
	private String position;
	
	//For detail
	private String email = "";
	private String phone = "";
	private String address = "";
	
	public EmployeeDetail(){}

	public EmployeeDetail(String name,int age,String sex,String position,String email,String phone,String address){
		this.name = name;
		this.age = age;
		this.sexual =sex; 
		this.position = position;
		this.email = email;
		this.phone = phone;
		this.address = address;
	}
	
	public void setName(String name){
		this.name=name;
	}
	
	public String getName(){
		return this.name;
	}

	public void setAge(int age){
		this.age=age;
	}
	
	public int getAge(){
		return this.age;
	}
	
	public void setSexual(String sex){
		this.sexual=sex;
	}
	
	public String getSexual(){
		return this.sexual;
	}
	
	public void setPosition(String position){
		this.position=position;
	}

	public String getPosition(){
		return this.position;
	}
	
	public void setEmail(String email){
		this.email = email;
	}
	
	public String getEmail(){
		return this.email;
	}
	
	public void setPhone(String phone){
		this.phone = phone;
	}
	
	public String getPhone(){
		return this.phone;
	}
	
	public void setAddress(String adr){
		this.address = adr;
	}
	
	public String getAddress(){
		return this.address;
	}
		
}

Employee.java:

package com.qilin.hammer.blazeds;
import java.io.Serializable;

public class Employee implements Serializable{

	private static final long serialVersionUID = 1L;
	private String name;
	private int age;
	private String sexual; 
	private String position;
	
	
	public Employee(String name,String position){
		this.name = name;
		this.age = age;
		this.sexual =sex;
		this.position = position;
	}	
	
	public void setName(String name){
		this.name=name;
	}
	
	public String getName(){
		return this.name;
	}

	public void setAge(int age){
		this.age=age;
	}
	
	public int getAge(){
		return this.age;
	}
	
	public void setSexual(String sex){
		this.sexual=sex;
	}
	
	public String getSexual(){
		return this.sexual;
	}
	
	public void setPosition(String position){
		this.position=position;
	}

	public String getPosition(){
		return this.position;
	}

		
}

4.? 配置flex/remoting-config.xml，指定EmployeeHelper类的位置。

remoting-config.xml:

    <destinationid="employeehelper">

        <properties>

                   <source>com.qilin.hammer.blazeds.EmployeeHelper</source>

        </properties>

    </destination>

5.? 将项目export为war文件，直接部署到tomcat的webapp下并启动tomcat。

6.? 打开Flex builder新建一个Flex project，命名为BlazedsClient。基本功能如下：

??? （1） 使用remoteobject组件调用Server端的Java方法getEmployees()去获取所有雇员的基本信息并显示在datagrid中。该方法返回类型为collection，与flex端的? arraycollection相映射，从而可以将返回结果直接作为datagrid的dataprovider。

??? （2） 通过同样的方法调用Server端的getDetails(list<map>)方法去获取指定雇员（们）的详细信息并显示在datagrid中。该方法的形参类型为collection，用于接收flex中的arraycollection实参，返回类型同样为collection，但在flex端通过对象绑定进行了转换，从而直接得到一个actionscript对象，当然也可以省去这一步而直接将返回结果作为dataprovider。有一个疑问是：我在java中用了map来与flex中的object进行映射，我不知道有没有更加直接的方法。为了从flex传一个自定义的对象类型employee到java，如果简单地在java中用list<employee>来接受flex中employee对象的arraycollection，却不能成功。但有意思的是，从java返回的employeedetail类型的对象却直接可以通过对象绑定转换为as中的相应自定义对象employeedetail，却不需要返回一个map来与flex中的object进行映射。

BlazedsClient.mxml：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="getEmployees()">

 <mx:Script>
	<![CDATA[
		import mx.events.ListEvent;
		import mx.collections.ArrayCollection;
		import mx.rpc.events.ResultEvent;
		import com.qilin.hammer.blazeds.*;
 	
 		[Bindable]
 		private var employeeDetails:ArrayCollection;
 		
    	private function getEmployees():void 
		{
			userRequest.getEmployees();
		}
    
    	private function resultHandler(event:ResultEvent):void{
    		var ac:ArrayCollection = ArrayCollection(event.result);
    		employeeDetails  = new ArrayCollection();
    		for (var i:int = 0; i<ac.length; i++){
    			var item:EmployeeDetail = EmployeeDetail(ac.getItemAt(i));
    			employeeDetails.addItem(item);
    		}
    		detailinfo.dataProvider = employeeDetails;
    	}
    	
    	private function getDetails(event:ListEvent):void{
    		var employeesQueried:ArrayCollection = new ArrayCollection();
    		var selectedItems:Array = basicinfo.selectedItems;
    		
    		for(var i:int = 0;i<selectedItems.length;i++){
    			var employee:Object = new Object();
    			employee.name = selectedItems[i]["name"];
    			employee.age = selectedItems[i]["age"];
    			employee.sexual = selectedItems[i]["sexual"];
    			employee.position = selectedItems[i]["position"];
    			employeesQueried.addItem(employee);
    		}
    		userRequest.getDetails(employeesQueried)
    		userRequest.addEventListener(ResultEvent.RESULT,resultHandler);
    	}
    	
    
	]]>
 </mx:Script>
 <mx:RemoteObject
        id="userRequest"
        destination="employeehelper"
        source="com.qilin.hammer.blazeds.EmployeeHelper"
        endpoint="http://localhost:8080/BlazedsServer/messagebroker/amf">
 </mx:RemoteObject>
 <mx:Canvas>
 	<mx:VBox>
 		<mx:DataGrid id="basicinfo" width="50%" 
 			allowMultipleSelection="true"
 			dataProvider="{userRequest.getEmployees.lastResult}" 
 			change="getDetails(event)"
 		    rowCount="{userRequest.getEmployees.lastResult.length}">
			<mx:columns>
 				<mx:DataGridColumn headerText="Name" dataField="name"/>
 				<mx:DataGridColumn headerText="Age" dataField="age"/>
 				<mx:DataGridColumn headerText="Sexual" dataField="sexual"/>
 				<mx:DataGridColumn headerText="Position" dataField="position"/>
			</mx:columns>
 		</mx:DataGrid>
  		<mx:DataGrid id="detailinfo" width="1000" rowCount="{employeeDetails.length}">
			<mx:columns>
 				<mx:DataGridColumn headerText="Name" dataField="name"/>
 				<mx:DataGridColumn headerText="Age" dataField="age"/>
 				<mx:DataGridColumn headerText="Sexual" dataField="sexual"/>
 				<mx:DataGridColumn headerText="Position" dataField="position"/>
 				<mx:DataGridColumn headerText="Email" dataField="email"/>
 				<mx:DataGridColumn headerText="Phone" dataField="phone"/>
 				<mx:DataGridColumn headerText="Address" dataField="address"/>
			</mx:columns>
 		</mx:DataGrid>		
 	</mx:VBox>
 </mx:Canvas>


</mx:Application>

package com.qilin.hammer.blazeds
{
	[Bindable]
	[RemoteClass(alias="com.qilin.hammer.blazeds.EmployeeDetail")]
	
	public class EmployeeDetail
	{
		public var name:String;
		public var age:Number;
		public var sexual:String;
		public var position:String;
		public var email:String;
		public var phone:String;
		public var address:String;

	}
}

总结：

???????? 在做这个demo时遇到一些问题，有这样几点需要注意：

??????? 1. 为了将java返回的对象直接拷贝构造为as中的对象，要保证as中的对象没有自定义的构造函数，只需要声明绑定即可，同时需要将所有成员属性设为public。

???????? 2.? 需要指明remoteobject的endpoint属性。