遍历获取JSONObject的所有Key代码,Java代码库,德仔网

代码语言

代码分类

【Java】遍历获取JSONObject的所有Key

作者:亦菲 / 发布于2018/1/24/ 1562

JSON解析使用JSONObject.keys()可以获取所有的key值，但是这种方法只能获取一层：比如{"b":"2","c":{"A":"1","B":"2"},"a":"1"}，只能够获取b,c,a如果想要获取被嵌套的{"A":"1","B":"2"}中A,B就不可以了

import java.util.Iterator;  
  
  
import org.json.JSONArray;  
import org.json.JSONException;  
import org.json.JSONObject;  
  
  
public class testGetKeys {  
  
      
     public static String getKeys(JSONObject test) throws JSONException{  
             
         String result = null;  
         testJsonCompare t = new testJsonCompare();  
         Iterator keys = test.keys();  
         while(keys.hasNext()){  
               
             try{  
                   
             String key = keys.next().toString();  
             String value = test.optString(key);  
               
             int i = t.testIsArrayORObject(value);  
               
             if(result == null || result.equals("")){  
                 if(i == 0){  
                  
                     result = key + ",";  
                     System.out.println("i=0 | key="+key+"| result="+result);  
                       
                       
                 }else if( i == 1){  
                      
                     result = key + ",";  
                     System.out.println("i=1 | key="+key+"| result="+result);  
                     result = getKeys(new JSONObject(value))+",";  
                 }else if( i == 2){  
                       
                     result = key + ",";  
                     System.out.println("i=2 | key="+key+"| result="+result);  
                     JSONArray arrays = new JSONArray(value);  
                     for(int k =0;k<arrays.length();k++){  
                         JSONObject array = new JSONObject(arrays.get(k));  
                         result = getKeys(array) + ",";  
                     }  
                 }  
                   
             }else{  
                  if(i == 0){  
                  
                 result = result + key + ",";  
                 System.out.println("i=0 | key="+key+"| result="+result);  
                   
                   
             }else if( i == 1){  
                  
                 result = result + key + ",";  
                 System.out.println("i=1 | key="+key+"| result="+result);  
                 result = result + getKeys(new JSONObject(value));  
             }else if( i == 2){  
                 result = result + key + ",";  
                 System.out.println("i=2 | key="+key+"| result="+result);  
                 JSONArray arrays = new JSONArray(value);  
                 for(int k =0;k<arrays.length();k++){  
                     JSONObject array = new JSONObject(arrays.get(k));  
                     result = result + getKeys(array) + ",";  
                 }  
             }  
             }  
              
               
         }catch(JSONException e){  
             e.printStackTrace();  
         }  
             }  
          
           
         return result;  
     }  
       
     public static void main(String args[]) throws org.json.JSONException{  
           
         JSONObject test = new JSONObject();  
         JSONObject test1 = new JSONObject();  
           
         try{  
              test1.put("A", "1");  
              test1.put("B", "2");  
                
              test.put("a", "1");  
              test.put("c", test1);  
              test.put("b", "2");  
            
              System.out.println(test.toString());  
                
         }catch(JSONException e){  
             e.printStackTrace();  
         }  
           
         String s = getKeys(test);  
         System.out.println(s);  
          
           
     }  
}  





testIsArrayORObject是判断一个字符串是array类型还是object


public int testIsArrayORObject(String sJSON){  
    /* 
     * return 0:既不是array也不是object 
     * return 1：是object 
     * return 2 ：是Array 
     */  
    try {  
        JSONArray array = new JSONArray(sJSON);  
        return 2;  
    } catch (JSONException e) {// 抛错 说明JSON字符不是数组或根本就不是JSON  
        try {  
            JSONObject object = new JSONObject(sJSON);  
            return 1;  
        } catch (JSONException e2) {// 抛错 说明JSON字符根本就不是JSON  
            System.out.println("非法的JSON字符串");  
            return 0;  
        }  
    }  
  
}

试试其它关键字

同语言下

可能有用的

亦菲贡献的其它代码(24)