android--使用Struts2服务端与android交互

一，服务器端：

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="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>  

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;  
        }   
}  

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>