android--使用Struts2服务端与android交互

本文转载自查看原文 2011-09-25 22:43 13708 android学习

一，服务器端：

首先搭建struts2的环境，导入必要的类库。

web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
 <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
   <filter-name>struts2</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

struts.xml文件：

<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="testjson" <span style="color:#ff0000;">extends="json-default"</span>>

	<action name="getjson" class="com.shao.action.JSONAction" method="json">
      <result type="json"></result>
	</action>

</package>
</struts>

Action类：

package com.shao.action;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;
import com.shao.domain.Music;

public class JSONAction extends ActionSupport implements ServletRequestAware,
		ServletResponseAware {

	/**
	 * 
	 */
	private static final long serialVersionUID = -3604892179657815531L;
	private  HttpServletRequest request;
	private  HttpServletResponse  response;
	private  String  format;
	public String getFormat() {
		return format;
	}

	public void setFormat(String format) {
		this.format = format;
	}

	@Override
	public void setServletRequest(HttpServletRequest request) {
		// TODO Auto-generated method stub
		this.request = request;
	}

	@Override
	public void setServletResponse(HttpServletResponse response) {
		// TODO Auto-generated method stub
		this.response = response;
	}
	
	public  void json(){
		List<Music> list = new ArrayList<Music>();
	//	JsonArray  jsonArray = new JsonArray();
	//	JsonObject jsonObject = new JsonObject();
		Gson gson = new  Gson();
		Music m1 = new Music();
		m1.setId(1);
		m1.setAuthor("游鸿明");
		m1.setName("白色恋人");
		m1.setTime("04:01");
		list.add(m1);
		Music m2 = new Music();
		m2.setId(2);
		m2.setAuthor("陈奕迅");
		m2.setName("淘汰");
		m2.setTime("04:44");
		list.add(m2);
		Music m3 = new Music();
		m3.setId(3);
		m3.setAuthor("谢霆锋");
		m3.setName("黄种人");
		m3.setTime("04:24");
		list.add(m3);
		java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
		}.getType();
		String beanListToJson = gson.toJson(list,type);
		System.out.println("GSON-->"+beanListToJson);   
        try {  
        	 response.setCharacterEncoding("GBK"); 
            //response.setContentType("text/xml;charset=utf-8");
            this.response.getWriter().write(beanListToJson);  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
	}
}

这个Music实体类，android客户端也用到。

package com.shao.domain;

public class Music {

	    private Integer id;  
	    private String name;  
	    private String time;
	    private String  author;
		public Integer getId() {
			return id;
		}
		public void setId(Integer id) {
			this.id = id;
		}
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getTime() {
			return time;
		}
		public void setTime(String time) {
			this.time = time;
		}
		public String getAuthor() {
			return author;
		}
		public void setAuthor(String author) {
			this.author = author;
		} 
}

访问 http://localhost:8080/Client/getjson.action;结果：

二，android客户端：

Activity类：

package com.shao.main;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class JsonClientActivity extends Activity {
    /** Called when the activity is first created. */
    private  Button  update;
    private ListView listView;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        update = (Button) findViewById(R.id.update);
        listView = (ListView) findViewById(R.id.list);
        update.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				 String urlStr="http://10.0.2.2:8080/Client/getjson.action";
			  String	result  = GsonUtil.getJson(urlStr);
			  List<Music>  list = GsonUtil.getListFromJson(result);
			  List<Map<String,Object>>  data  = getAdapterData(list);
			  
			 SimpleAdapter  adapter  =new  SimpleAdapter(JsonClientActivity.this, data, R.layout.list, new String[]{"name","author","time"}, new int[]{R.id.name,R.id.author,R.id.time}); 
			 listView.setAdapter(adapter);
			 //listView.
			}
		});
    } 
	private List<Map<String,Object>>  getAdapterData(List  list){
		  List<Map<String,Object>>  data = new  ArrayList<Map<String,Object>>();
		  for(int i=0;i<list.size();i++){
			  Map<String,Object>  map = new HashMap<String, Object>();
			  Music music= (Music)list.get(i);
			  map.put("name",music.getName());
			  map.put("author", music.getAuthor());
			  map.put("time",music.getTime());
			  data.add(map);
		  }
		  return   data;
	}
}

package com.shao.main;

import java.net.URI;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.google.gson.Gson;

public class GsonUtil {
       public static  String getJson(String  url){
    	   
    	   HttpClient client = new DefaultHttpClient();
    	   
    	   HttpPost  request;
    	   try {
			request = new HttpPost(new URI(url));
			HttpResponse  response  =  client.execute(request);
			  // 判断请求是否成功    
            if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功  
            	HttpEntity 	entity = response.getEntity();
            	if(entity!=null){
            		String beanListToJson = EntityUtils.toString(entity,"GBK");
            		return beanListToJson;
             	}
            }
          
		} catch (Exception e) {
			// TODO: handle exception
		}
		 return  null;
       }
   public  static  List<Music>  getListFromJson(String json){
		java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
		}.getType();
		Gson gson = new Gson();
		List<Music>  list  = gson.fromJson(json, type);
		return list;
   }
}

list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
	android:id="@+id/name"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="name"
    />
 <TextView 
 	android:id="@+id/author"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:layout_below="@id/name"
    android:paddingTop="5px"
    android:text="author"
     >
 </TextView>
 <TextView 
 	android:id="@+id/time"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:layout_below="@id/name"
    android:layout_alignTop="@id/author"
    android:layout_alignParentRight="true"
    android:text="time">
 </TextView>    
</RelativeLayout>

运行结果：

主要的交互都是通过goolge的Gson完成

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