Android解析服务器返回的Json数据

</pre><pre name="code" class="java">服务器端的返回数据的servlet

package servlet;

import impl.JsonService;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import domain.Person;

public class JosnServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		List<Person> persons = JsonService.getListPerson();
		StringBuffer sb = new StringBuffer();
		sb.append('[');
		for (Person person : persons) {
			sb.append('{').append("\"name\":")
					.append("\"" + person.getName() + "\"").append(",");
			sb.append("\"address\":").append("\"" + person.getAddress() + "\"")
					.append(",");
			sb.append("\"age\":").append(person.getAge());
			sb.append('}').append(",");
		}
		sb.deleteCharAt(sb.length() - 1);
		sb.append(']');
		out.write(new String(sb));
		out.flush();
		out.close();

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

实现类
package impl;

import java.util.ArrayList;
import java.util.List;

import domain.Person;

public class JsonService {  
    public static List<Person> getListPerson() {  
        List<Person> mLists = new ArrayList<Person>();  
        mLists.add(new Person("张三", "北京", 20));  
        mLists.add(new Person("李四", "上海", 30));  
        mLists.add(new Person("王五", "深圳", 35));  
        return mLists;  
    }
}

package domain;

public class Person {
	private String name;
	private String address;
	private Integer age;

	 public Person() {
		// TODO Auto-generated constructor stub
	}

	public Person(String id, String address, Integer age) {
		this.name = id;
		this.address = address;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}
}

客户端的代码

解析工具类
public class JsonParse {
	/**
	 * 解析Json数据
	 * 
	 * @param urlPath
	 * @return mlists
	 * @throws Exception
	 */

	public static List<Person> getListPerson(String urlPath) throws Exception {
		List<Person> mlists = new ArrayList<Person>();
		byte[] data = readParse(urlPath);
		JSONArray array = new JSONArray(new String(data));
		for (int i = 0; i < array.length(); i++) {
			JSONObject item = array.getJSONObject(i);
			String name = item.getString("name");
			String address = item.getString("address");
			int age = item.getInt("age");
			mlists.add(new Person(name, address, age));
		}
		return mlists;
	}

	/**
	 * 从指定的url中获取字节数组
	 * 
	 * @param urlPath
	 * @return 字节数组
	 * @throws Exception
	 */
	public static byte[] readParse(String urlPath) throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] data = new byte[1024];
		int len = 0;
		URL url = new URL(urlPath);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		InputStream inStream = conn.getInputStream();

		while ((len = inStream.read(data)) != -1) {
			outStream.write(data, 0, len);

		}
		inStream.close();
		return outStream.toByteArray();

	}
}

Person类

public class Person {
	private String name;
	private String address;
	private Integer age;

	public Person() {
		super();
	}

	public Person(String name, String address, Integer age) {
		super();
		this.name = name;
		this.address = address;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", address=" + address + ", age=" + age
				+ "]";
	}
	
	

}

MainActity类

public class MainActivity extends Activity {
	private Button mButton;
	private ListView mListView;
	private static final String urlPath = "http://192.168.13.76:8080/XmlJsonServer/servlet/JosnServlet";
	private static final String TAG = "MainActivity";
	private List<Person> persons;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		mButton = (Button) findViewById(R.id.button1);
		mListView = (ListView) findViewById(R.id.listView1);
		mButton.setOnClickListener(new MyOnClickListener());
	}
	private class MyOnClickListener implements OnClickListener {
		@Override
		public void onClick(View v) {
			try {
				//得到Json解析成功之后数据
				persons = JsonParse.getListPerson(urlPath);
				
				List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
				for (int i = 0; i < persons.size(); i++) {
					HashMap<String, Object> map = new HashMap<String, Object>();
					map.put("name", persons.get(i).getName());
					map.put("address", persons.get(i).getAddress());
					map.put("age", persons.get(i).getAge());
					data.add(map);
				}
				SimpleAdapter _Adapter = new SimpleAdapter(MainActivity.this,
						data, R.layout.listview_item, new String[] { "name",
								"address", "age" }, new int[] { R.id.textView1,
								R.id.textView2, R.id.textView3 });
				mListView.setAdapter(_Adapter);
			} catch (Exception e) {
				Toast.makeText(MainActivity.this, "解析失败", 2000);
				Log.i(TAG, e.toString());
			}
		}
	}
}