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; } @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