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() 
     */  
    @Override  
    public List<Good> findAll() {  
        // 创建请求HttpClient客户端  
        HttpClient httpClient = new DefaultHttpClient();  
        // 创建请求的url  
        String 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() 
     */  
    @Override  
    public Good findById() {  
        // 创建请求HttpClient客户端  
        HttpClient httpClient = new DefaultHttpClient();  
        // 创建请求的url  
        String 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