原创：struts2+json+android开发整合解析终结
上节课程我们重点介绍了struts2+json+android服务器段的开发,那这节课程我们就重点介绍在android客户端是怎么解析json集合|实体对象的方式 1、首先在这里我们新建一个android2.2的项目,新建完毕后因为此项目要进行网络访问操作,所以第一步应该在androidMainifest.xml文件中添加网络访问权限代码如下：<uses-permission android:name="android.permission.INTERNET"></uses-permission> 2、然后创建业务bean及service对应的类代码如下： 业务Bean与上节课程中的业务一致。 Servcie层： 接口：package cn.redarmy.service;import java.util.List;import cn.redarmy.domain.Good;public interface GoodService {// 获取最新的商品信息public abstract List<Good> findAll();// 获取最新的单个商品的详细信息public abstract Good findById();}Service接口的实现类：在这里我们首先完成对商品的详细信息的解析：package cn.redarmy.service.Impl;import java.io.IOException;import java.net.URI;import java.net.URISyntaxException;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import cn.redarmy.domain.Good;import cn.redarmy.service.GoodService;public class GoodServiceImpl implements GoodService {// 获取最新的商品信息/* (non-Javadoc) * @see cn.redarmy.service.Impl.GoodService#findAll() */@Overridepublic List<Good> findAll() {// 创建请求HttpClient客户端HttpClient httpClient = new DefaultHttpClient();// 创建请求的urlString url = "http://192.168.4.32:8080/shop/csdn/listNewsGoods.action";try {// 创建请求的对象HttpGet get = new HttpGet(new URI(url));// 发送get请求HttpResponse httpResponse = httpClient.execute(get);// 如果服务成功返回响应if (httpResponse.getStatusLine().getStatusCode() == 200) {HttpEntity entity = httpResponse.getEntity();if (entity != null) {// 获取服务器响应的json字符串String json = EntityUtils.toString(entity);return parseArrayJosn(json);}}} catch (Exception e) {e.printStackTrace();}return null;}//解析json数组对象private List<Good> parseArrayJosn(String json) {List<Good> goods = new ArrayList<Good>();try {JSONArray array = new JSONObject(json).getJSONArray("goods");for (int i = 0; i < array.length(); i++) {JSONObject obj = array.getJSONObject(i);Good good = new Good(obj.getInt("id"), obj.getString("name"),(float) obj.getDouble("price"));goods.add(good);}} catch (JSONException e) {e.printStackTrace();}return goods;}// 获取最新的单个商品的详细信息/* (non-Javadoc) * @see cn.redarmy.service.Impl.GoodService#findById() */@Overridepublic Good findById() {// 创建请求HttpClient客户端HttpClient httpClient = new DefaultHttpClient();// 创建请求的urlString url = "http://192.168.4.32:8080/shop/csdn/findGood.action";try {// 创建请求的对象HttpGet get = new HttpGet(new URI(url));// 发送get请求HttpResponse httpResponse = httpClient.execute(get);// 如果服务成功返回响应if (httpResponse.getStatusLine().getStatusCode() == 200) {HttpEntity entity = httpResponse.getEntity();if (entity != null) {// 获取服务器响应的json字符串String json = EntityUtils.toString(entity);return parseObjJosn(json);}}} catch (Exception e) {e.printStackTrace();}return null;}//解析json的单个对象private Good parseObjJosn(String json) {JSONObject obj = null;try {obj = new JSONObject(json).getJSONObject("good");Good good = new Good(obj.getInt("id"), obj.getString("name"),(float) obj.getDouble("price"));return good;} catch (JSONException e) {e.printStackTrace();}return null;}}创建用于显示商品信息的listView及对应的组件 创建good.xml文件 <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <TextView android:layout_height="wrap_content" android:text="TextView" android:id="@+id/name" android:layout_width="200dip"></TextView> <TextView android:layout_height="wrap_content" android:text="TextView" android:id="@+id/price" android:layout_width="match_parent"></TextView> </LinearLayout>在main.xml文件中添加listView组件<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ListView android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/goods"></ListView></LinearLayout>最后完成GoodActivity的编写代码如下：package cn.redarmy.activity;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.ListView;import android.widget.SimpleAdapter;import cn.redarmy.domain.Good;import cn.redarmy.service.GoodService;import cn.redarmy.service.Impl.GoodServiceImpl;public class GoodActivity extends Activity { private GoodService goodService = new GoodServiceImpl(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //解析集合 /* try {List<Good> goods = goodService.findAll();ListView listView = (ListView) this.findViewById(R.id.goods);List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();for (Good good : goods) {HashMap<String, Object> item = new HashMap<String, Object>();item.put("name", good.getName());item.put("price", getResources().getString(R.string.price)+good.getPrice());item.put("id", good.getId());data.add(item);}SimpleAdapter adapter = new SimpleAdapter(this, data,R.layout.good, new String[] { "name", "price" },new int[] { R.id.name, R.id.price });listView.setAdapter(adapter);} catch (Exception e) {Log.v("error", "网络连接失败");e.printStackTrace();}*/ //解析单个对象 try {Good good = goodService.findById();ListView listView = (ListView) this.findViewById(R.id.goods);List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();HashMap<String, Object> item = new HashMap<String, Object>();item.put("name", good.getName());item.put("price", getResources().getString(R.string.price)+good.getPrice());item.put("id", good.getId());data.add(item);SimpleAdapter adapter = new SimpleAdapter(this, data,R.layout.good, new String[] { "name", "price" },new int[] { R.id.name, R.id.price });listView.setAdapter(adapter);} catch (Exception e) {Log.v("error", "网络连接失败");e.printStackTrace();}}}通过以上方式就能实现struts2+android+json的开发了，希望你所有收获以上内容归redarmychen版权所有，如想转载请附带出处,如有疑问请发邮件至redarmy.chen@gmail.com 2 楼 HUYIZIZHEN 2012-01-29 请问你这个代码能获取到JSON数据吗，服务器端是怎样向客户端传递数据的？还请指教。 3 楼 forever-liang 2012-04-02 服务器端那里的，为什么要在struts.xml文件的result里写正则表达式呢？在代码里不能用JsonObject封装返回数据吗？