android--使用Struts2服务端与android交互

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;}@Overridepublic void setServletRequest(HttpServletRequest request) {// TODO Auto-generated method stubthis.request = request;}@Overridepublic void setServletResponse(HttpServletResponse response) {// TODO Auto-generated method stubthis.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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub String urlStr="http://10.0.2.2:8080/Client/getjson.action";  Stringresult  = 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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