Struts2_Android(2.2)_模拟数据访问项目 JSON项目

<!-- 允许客户端联网 -->
<uses-permission android:name="android.permission.INTERNET"></uses-permission>

package com.example.coffeeclient;

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

	private ListView listView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.listView = new ListView(this);
		// 调试地址 10.0.2.2
		String url = "http://10.0.2.2:8080/coffeeServer/getCoffeeList";
		ArrayAdapter<String> aa = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, getData(url));
		this.listView.setAdapter(aa);
		setContentView(this.listView);
	}

	// 获得服务端数据(服务端通过PrintWriter输出JSON数组)
	private List<String> getData(String url) {

		List<String> list = new ArrayList<String>();
		String result = "";
		HttpURLConnection conn = null;
		try {
			URL _url = new URL(url);
			// 打开连接
			conn = (HttpURLConnection) _url.openConnection();
			// 创建一个字节数组
			byte[] data = new byte[conn.getContentLength()];
			// 读取输入流中的数据
			conn.getInputStream().read(data);
			result = new String(data);
			JSONArray arr = new JSONArray(result);
			for (int i = 0; i < arr.length(); i++) {
				JSONObject o = arr.getJSONObject(i);
				String s = " " + o.getString("cname") + "  "
						+ o.getDouble("cmoney") + " 元";
				list.add(s);
			}
		} catch (Exception e) {
			throw new RuntimeException(e);
		}finally{
			//关闭连接
			conn.disconnect();
		}
		return list;
	}
}

package com.web;

import java.io.PrintWriter;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.apache.struts2.interceptor.ServletResponseAware;

import com.bll.TbGoodService;
import com.bll.TbGoodServiceImpl;
import com.entity.TCoffee;
import com.opensymphony.xwork2.ActionSupport;

public class TbGoodAction extends ActionSupport implements ServletResponseAware {
	
	private TbGoodService tbGoodService = new TbGoodServiceImpl();
	private HttpServletResponse response;
	
	public String findAll() throws Exception{
		
		//从业务层拿到数据
		List<TCoffee> list = this.tbGoodService.findAll();
		
		this.response.setContentType("text/html;charset=UTF-8");
		
		//使用PrintWriter对象输出JSON数组
		PrintWriter out = this.response.getWriter();
		//创建JSON数组
		JSONArray arr = new JSONArray();
		for(TCoffee t : list){
			//创建JSON对象
			JSONObject g=new JSONObject();
			//设置属性
			g.put("cid", t.getCid());
			g.put("cname", t.getCname());
			g.put("cmoney", t.getCmoney());
			//添加JSON对象到JSON数组
			arr.add(g);
		}
		out.print(arr);
		System.out.println(arr);
		return null;
	}

	public void setServletResponse(HttpServletResponse response) {
		// TODO Auto-generated method stub
		this.response = response;
	}
	
}