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("\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());
}
}
时间： 2024-11-06 21:58:23