jsons数据解析

 今天做个任务，需要json数据解析。以前只做过Gson 解析，代码如下：

				Gson gson=new Gson();
	                  ArrayList<News> list=gson.fromJson(arg0,
		            new TypeToken<ArrayList<News>>() {}.getType());
											

　　

json的源数据：list转化成JSONArray.

     NewsInfoDAO list=new NewsInfoDAO();
        List<News> listNews=list.getAllNews(type);
        
        JSONArray array=JSONArray.fromObject(listNews);
        
        out.print(array.toString());

通过gson解析成list。

今天做的任务由于不知道源json数据的类型 json数据： {“Code”:1,"Data":{}}  用Gson没解析出来。经查阅资料得：一种简单的json数据解析方法:

JSONObject 和JSONArray 

Data类：

public class Data {
    
    
    private int UID;
    private String Key;
    private int Agent;
    private String Agent_Key;
    private int Store;
    private String Store_Key;

    
    public int getUID() {
        return UID;
    }
    public void setUID(int uID) {
        UID = uID;
    }
    public String getKey() {
        return Key;
    }
    public void setKey(String key) {
        Key = key;
    }
    public int getAgent() {
        return Agent;
    }
    public void setAgent(int agent) {
        Agent = agent;
    }
    public String getAgent_Key() {
        return Agent_Key;
    }
    public void setAgent_Key(String agent_Key) {
        Agent_Key = agent_Key;
    }
    public int getStore() {
        return Store;
    }
    public void setStore(int store) {
        Store = store;
    }
    public String getStore_Key() {
        return Store_Key;
    }
    public void setStore_Key(String store_Key) {
        Store_Key = store_Key;
    }
    public Data(int uID, String key, int agent, String agent_Key,
            int store, String store_Key) {
        super();
        
        UID = uID;
        Key = key;
        Agent = agent;
        Agent_Key = agent_Key;
        Store = store;
        Store_Key = store_Key;
    }
    public Data() {
        super();
    }
    


}

客户端：用volley请求队列：

queue=Volley.newRequestQueue(MainActivity.this);
                CustomRequest request=new CustomRequest(Method.POST, 
                        "http://api.hht365.net/Member/Verify.php",
                        new Listener<String>() {

                            @Override
                            public void onResponse(String arg0) 
                               JSONObject jsonObject;    
                                try {
                                    jsonObject = new JSONObject(arg0);
                                    
                                     co = jsonObject.getInt("Code");
                                     data=(Data)jsonObject.get("Data");

                                } catch (JSONException e) {
                                    // TODO Auto-generated catch block
                                    e.printStackTrace();
                                }
                                

                                switch(co){
                                case 0:
                                    
                                    handler.sendEmptyMessage(0);

                                    break;
                                case 1:
                                    handler.sendEmptyMessage(1);
                                    break;
                                case 2:
                                    handler.sendEmptyMessage(2);
                                    break;
                                case 3:
                                    handler.sendEmptyMessage(3);
                                    break;
                                case 4:
                                    handler.sendEmptyMessage(4);
                                    break;
                                case 5:
                                    handler.sendEmptyMessage(5);
                                    break;
                                case 6:
                                    handler.sendEmptyMessage(6);
                                    break;
                                    default:
                                    break;
                                
                                }
                                
                            }
                        }, new ErrorListener() {

                            @Override
                            public void onErrorResponse(VolleyError arg0) {
                                // TODO Auto-generated method stub
                                handler.sendEmptyMessage(7);
                                
                                
                            }
                        });
                request.setParams("username", username.getText().toString().trim());
                request.setParams("password", password.getText().toString().trim());
                request.setParams("code", code.getText().toString().trim());
                request.setParams("cid", String.valueOf(cid));
                request.setParams("role", role);
                queue.add(request);
            }
        });
        
    }

JSONObject jsonObject = new JSONObject(json);获取服务端的json数据

int code = jsonObject.optString("code");获取code对象；

Data data=(Data)jsonObject.get("Data");获取Data对象；

这样json数据就解析出来了。

总结：json数据的解析：

基本方法介绍：

1. List集合转换成json方法

List list = new ArrayList();
list.add( "first" );
list.add( "second" );
JSONArray jsonArray = JSONArray.fromObject( list );

2. Map集合转换成json方法

Map map = new HashMap();
map.put("name", "json");
map.put("bool", Boolean.TRUE);
map.put("int", new Integer(1));
map.put("arr", new String[] { "a", "b" });
map.put("func", "function(i){ return this.arr[i]; }");
JSONObject json = JSONObject.fromObject(map);

3. Bean转换成json代码

JSONObject jsonObject = JSONObject.fromObject(new JsonBean());

4. 数组转换成json代码

boolean[] boolArray = new boolean[] { true, false, true };
JSONArray jsonArray1 = JSONArray.fromObject(boolArray);

5. 一般数据转换成json代码

JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']" );

 6.beans转换成json代码

List list = new ArrayList();
JsonBean2 jb1 = new JsonBean2();
jb1.setCol(1);
jb1.setRow(1);
jb1.setValue("xx");

JsonBean2 jb2 = new JsonBean2();
jb2.setCol(2);
jb2.setRow(2);
jb2.setValue("");

list.add(jb1);
list.add(jb2);
JSONArray ja = JSONArray.fromObject(list);

演示示例

package com.json;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

/**
 * 使用json-lib构造和解析Json数据
 * 
 * @author Alexia
 * @date 2013/5/23
 *
 */
public class JsonTest {

    /**
     * 构造Json数据
     * 
     * @return
     */
    public static String BuildJson() {

        // JSON格式数据解析对象
        JSONObject jo = new JSONObject();

        // 下面构造两个map、一个list和一个Employee对象
        Map<String, String> map1 = new HashMap<String, String>();
        map1.put("name", "Alexia");
        map1.put("sex", "female");
        map1.put("age", "23");

        Map<String, String> map2 = new HashMap<String, String>();
        map2.put("name", "Edward");
        map2.put("sex", "male");
        map2.put("age", "24");

        List<Map> list = new ArrayList<Map>();
        list.add(map1);
        list.add(map2);

        Employee employee = new Employee();
        employee.setName("wjl");
        employee.setSex("female");
        employee.setAge(24);

        // 将Map转换为JSONArray数据
        JSONArray ja1 = JSONArray.fromObject(map1);
        // 将List转换为JSONArray数据
        JSONArray ja2 = JSONArray.fromObject(list);
        // 将Bean转换为JSONArray数据
        JSONArray ja3 = JSONArray.fromObject(employee);

        System.out.println("JSONArray对象数据格式：");
        System.out.println(ja1.toString());
        System.out.println(ja2.toString());
        System.out.println(ja3.toString());

        // 构造Json数据，包括一个map和一个Employee对象
        jo.put("map", ja1);
        jo.put("employee", ja2);
        System.out.println("
最终构造的JSON数据格式：");
        System.out.println(jo.toString());

        return jo.toString();

    }

    /**
     * 解析Json数据
     * 
     * @param jsonString Json数据字符串
     */
    public static void ParseJson(String jsonString) {

        // 以employee为例解析，map类似
        JSONObject jb = JSONObject.fromObject(jsonString);
        JSONArray ja = jb.getJSONArray("employee");

        List<Employee> empList = new ArrayList<Employee>();

        // 循环添加Employee对象（可能有多个）
        for (int i = 0; i < ja.size(); i++) {
            Employee employee = new Employee();

            employee.setName(ja.getJSONObject(i).getString("name"));
            employee.setSex(ja.getJSONObject(i).getString("sex"));
            employee.setAge(ja.getJSONObject(i).getInt("age"));

            empList.add(employee);
        }

        System.out.println("
将Json数据转换为Employee对象：");
        for (int i = 0; i < empList.size(); i++) {
            Employee emp = empList.get(i);
            System.out.println("name: " + emp.getName() + " sex: "
                    + emp.getSex() + " age: " + emp.getAge());
        }

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        ParseJson(BuildJson());
    }

}