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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:

    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();
        }
        
    
    
    }
    View Code

    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);
                }
            });
            
        }
    View Code

    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());
        }
    
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/wei1228565493/p/4175310.html
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