原创：struts2+json+android开发调整解析终结

   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

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

1 楼 Jorson33 2011-12-05  

学习学习