将两个字符串映射成JSON

Question

这里是JSON字符串我所期待的：

{ 
    "startDate": "2013-01-01", 
    "columns": "mode , event", 
    "endDate": "2013-02-01", 
    "selection": { 
     "selectionMatch": "123456789012", 
     "selectionType": "smart" 
    } 
} 

这里是Java代码，但我没能成功：

public static String BuildJson() throws JSONException{ 

    Map<String, String> map1 = new HashMap<String, String>(); 
    map1.put("startDate", "2013-01-01"); 
    map1.put("endDate", "2013-02-01"); 
    map1.put("columns", "mode , event"); 

    Map<String, String> map2 = new HashMap<String, String>(); 
    map2.put("selectionType", "smart"); 
    map2.put("selectionMatch", "123456789012"); 

    JSONArray ja2 = new JSONArray(); 
    ja2.put(map2); 
    System.out.println(ja2.toString()); 

    map1.put("selection", ja2.toString()); 

    System.out.println(); 
    JSONArray ja = new JSONArray(); 
    ja.put(map1); 
    System.out.println(ja.toString()); 

    return null; 
} 

的挑战是如何组合两个不在同一级别的地图字符串。我的代码结果是：

[{"startDate":"2013-01-01","columns":"mode , event","endDate":"2013-02-01","selection":"[{\"selectionMatch\":\"123456789012\",\"selectionType\":\"smart\"}]"}] 

有人可以帮我吗？

Answer 1

这里，就是你想要的代码，

public static String BuildJson() throws JSONException 
    { 

     JSONObject map1 = new JSONObject(); 
     map1.put("startDate", "2013-01-01"); 
     map1.put("endDate", "2013-02-01"); 
     map1.put("columns", "mode , event"); 

     JSONObject map2 = new JSONObject(); 

     map2.put("selectionType", "smart"); 
     map2.put("selectionMatch", "123456789012"); 

     map1.put("selection",map2); 

     System.out.println(map1.toString()); 

     return null; 

    } 

输出将是

{ 
    "startDate":"2013-01-01", 
    "columns":"mode , event", 
    "endDate":"2013-02-01", 
    "selection":{ 
     "selectionMatch":"123456789012", 
     "selectionType":"smart" 
    } 
} 

使用的JSONObject而不是地图，如果u需要JSONArray u可以使用之谓也。

Answer 2

JSONObject object = new JSONObject(map1); 
object.put('selection', map2); 

System.out.println(object.toString());