android的从服务器取得json对象进行解析

先写服务器端的代码，先写一个person对象

public class Person {    private int id;    private String name;    private String address;    public Person() {        // TODO Auto-generated constructor stub    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    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;    }    @Override    public String toString() {        return "Person [id=" + id + ", name=" + name + ", address=" + address                + "]";    }    public Person(int id, String name, String address) {        super();        this.id = id;        this.name = name;        this.address = address;    } }

初始化一下person对象

public class JsonService {    //一个person对象    public Person getPerson(){        Person person=new Person(1001,"hang","suqian");        return person;    } }

服务器端json的工具类

public class JsonToos {    public static String CreateJsonString(String key,Object value){        //生成json的string        JSONObject jsonObject=new JSONObject();         jsonObject.put(key,value);          return jsonObject.toString();             } }

服务端的servlet

public class JsonAction extends HttpServlet {    /**     *     */    private static final long serialVersionUID = 1L;    private JsonService service;    /**     * @see HttpServlet#HttpServlet()     */    public JsonAction() {        super();        // TODO Auto-generated constructor stub    }          protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {             doPost(request, response);    }          protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setContentType("text/html;charset=utf-8");        request.setCharacterEncoding("utf-8");        response.setCharacterEncoding("utf-8");        PrintWriter out=response.getWriter();                 String jsonString=JsonToos.CreateJsonString("person",service.getPerson());        out.println(jsonString);        out.flush();        out.close();         }    @Override    public void init() throws ServletException {        service=new JsonService();    } }

注意

<uses-permission android:name="android.permission.INTERNET"/>

这个一定要加的，网络访问权限

定义person的对象同上

下面是http的工具类，主要是http访问，获取json的字符串

public class HttpUtils {    public static String getJsonContent(String path){        try {            URL url=new URL(path);            HttpURLConnection connection=(HttpURLConnection) url.openConnection();            connection.setConnectTimeout(3000);            connection.setRequestMethod("GET");            connection.setDoInput(true);            int code=connection.getResponseCode();            if(code==200){                return changeInputString(connection.getInputStream());            }        } catch (Exception e) {            // TODO: handle exception        }        return "";    }     private static String changeInputString(InputStream inputStream) {                 String jsonString="";        ByteArrayOutputStream outPutStream=new ByteArrayOutputStream();        byte[] data=new byte[1024];        int len=0;        try {            while((len=inputStream.read(data))!=-1){                outPutStream.write(data, 0, len);            }            jsonString=new String(outPutStream.toByteArray());                 } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return jsonString;    } }

下面为解析json字符串，把值赋给person对象

public class JsonTools {     public static Person getPerson(String key, String jsonString) {        Person person = new Person();                 try {            JSONObject jsonObject = new JSONObject(jsonString);            JSONObject personObject = jsonObject.getJSONObject(key);             person.setId(personObject.getInt("id"));            person.setName(personObject.getString("name"));            person.setAddress(personObject.getString("address"));        } catch (Exception e) {            // TODO: handle exception        }        return person;    }     public static List<Person> getPersons(String key, String jsonString) {        List<Person> list = new ArrayList<Person>();        try {            JSONObject jsonObject = new JSONObject(jsonString);            JSONArray jsonArray = jsonObject.getJSONArray(key);            for (int i = 0; i < jsonArray.length(); i++) {                JSONObject jsonObject2 = jsonArray.getJSONObject(i);                Person person = new Person();                person.setId(jsonObject2.getInt("id"));                person.setName(jsonObject2.getString("name"));                person.setAddress(jsonObject2.getString("address"));                list.add(person);            }        } catch (Exception e) {            // TODO: handle exception        }        return list;    }     public static List<String> getlistString(String key, String jsonString) {        List<String> list = new ArrayList<String>();        try {            JSONObject jsonObject = new JSONObject(jsonString);            JSONArray jsonArray = jsonObject.getJSONArray(key);            for (int i = 0; i < jsonArray.length(); i++) {                 String msg = jsonArray.getString(i);                list.add(msg);            }         } catch (Exception e) {            // TODO: handle exception        }         return list;    }     public static List<Map<String,Object>> getlistMap(String key, String jsonString){        List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();        try {            JSONObject jsonObject = new JSONObject(jsonString);            JSONArray jsonArray = jsonObject.getJSONArray(key);            for (int i = 0; i < jsonArray.length(); i++) {                JSONObject jsonObject2 = jsonArray.getJSONObject(i);                  Map<String,Object> map=new HashMap<String, Object>();                  Iterator<String> iterator=jsonObject2.keys();                                     while(iterator.hasNext()){                      String json_key=iterator.next();                      Object json_value=jsonObject2.get(json_key);                      if(json_value==null){                          json_value="";                      }                      map.put(json_key, json_value);                  }               list.add(map);            }            }catch(Exception e){                e.printStackTrace();            }        return list;    }}

android点击button触发的事件

@Override    public void onClick(View v) {                 switch (v.getId()) {        case  R.id.person:            path="http://192.168.123.1/http/JsonAction";        String jsonstring=HttpUtils.getJsonContent(path);        Log.i(TAG,"1212"+jsonstring);                 Person person=JsonTools.getPerson("person", jsonstring);        Log.i(TAG,person.toString());        break;         default:            break;        }    } }

更多参考：http://blog.csdn.net/zc527/article/details/44465053