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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:

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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();    }    }
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客户端:用volley请求队列:

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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 one rrorResponse(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);            }        });            }
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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=http://www.mamicode.com/(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

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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("\n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("\n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());    }}
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jsons数据解析