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() {

4000
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());
}
}
}
}