如何將數據格式化爲特定的JSON格式

這裏需要一些邏輯的幫助 - 我試圖以特定的方式（父 - 子關係/樹格式）格式化數據到json中（我正在使用gson）。但我似乎無法做到。下面是我能夠製作的最接近的格式，下面有我希望輸出的格式。這需要作爲散列表返回。如何將數據格式化爲特定的JSON格式

我遇到的一個問題是將[]括號放在「children」後面。在第一個「孩子」之後，括號就在那裏，但以後不會出現。我的猜測是因爲[]括號只在我使用HashSet時出現。那麼也許，將哈希集放入哈希集可以解決這個特殊問題？

我有它的代碼是在這裏：

public class DendrogramPlaySheet extends BrowserPlaySheet { 
public Hashtable processQueryData() { 
      HashSet food = new HashSet(); 

      String[] var = wrapper.getVariables(); 

      for (int i=0; i<list.size(); i++){ 
       LinkedHashMap foodType = new LinkedHashMap(); 
       LinkedHashMap foodItem = new LinkedHashMap(); 
       LinkedHashMap foodFlavor = new LinkedHashMap(); 

       //this is a table of data that we get from a query 
       Object[] listElement = list.get(i); 

       //taking columns and putting them into the hashmap 
       foodType.put("name", listElement[0]); 
       foodItem.put("name", listElement[1]); 
       foodFlavor.put("name", listElement[2]); 

       foodItem.put("children", foodFlavor); 
       foodType.put("children", foodItem); 

       food.add(foodType); 
      } 

      Hashtable allHash = new Hashtable(); 

      allHash.put("name", "Food"); 
      allHash.put("children", food); 
      return allHash; 
    }

}

什麼我的代碼生成：

{ 
    "name":"Food", 
    "children":[ 
    { 
    "name":"Italian", 
    "children":{ 
     "name":"Pizza", 
     "children":{ 
      "name":"Cheese" 
     } 
    } 
    }, 
    { 
    "name":"American", 
    "children":{ 
     "name":"Hamburgers", 
     "children":{ 
      "name":"Plain" 
     } 
    } 
    }, 
    { 
    "name":"Italian", 
    "children":{ 
     "name":"Pasta", 
     "children":{ 
      "name":"Pesto" 
     } 
    } 
    }, 
    { 
    "name":"Italian", 
    "children":{ 
     "name":"Cannoli", 
     "children":{ 
      "name":"Plain" 
     } 
    } 
    }, 
    { 
    "name":"Italian", 
    "children":{ 
     "name":"Pizza", 
     "children":{ 
      "name":"Pepperoni" 
     } 
    } 
    }, 
    { 
    "name":"Mexican", 
    "children":{ 
     "name":"Burritos", 
     "children":{ 
      "name":"Beef" 
     } 
    } 
    } 
    ] 
}

我想輸出：

{ 
    "name":"Food", 
    "children":[ 
    { 
    "name":"Italian", 
    "children":[ 
    { 
     "name":"Pizza", 
     "children":[ 
      {"name":"Pepperoni"}, 
      {"name":"Cheese"}, 
    ] 
    }, 
    { 
     "name":"Cannoli", 
     "children":[ 
      {"name":"Plain"}, 
    ] 
    }, 
    { 
     "name":"Pasta", 
     "children":[ 
      {"name":"Pesto"}, 
    ] 
    }, 
    ] 
    }, 
    { 
    "name":"American", 
    "children":[ 
    { 
     "name":"Hamburgers", 
     "children":[ 
      {"name":"Plain"}, 
      ] 
    }, 
    ] 
    }, 
    { 
    "name":"Mexican", 
    "children":[ 
    { 
     "name":"Burritos", 
     "children":[ 
      {"name":"Beef"}, 
    ] 
    }, 
    ] 
    } 
]

}

來源

2014-01-29 mrdaywee

我想你想是這樣的

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 

import com.google.gson.Gson; 

public class DendrogramPlaySheet { 
    public static void main(String[] args){ 
     Map m = new HashMap(); 
     m.put("name", "food"); 

     Map m3 = new HashMap(); 
     m3.put("name", "peperoni"); 

     Map m4 = new HashMap(); 
     m4.put("name", "cheese"); 

     List list2 = new ArrayList(); 
     list2.add(m3); 
     list2.add(m4); 

     Map m2 = new HashMap(); 
     m2.put("name", "pizza"); 
     m2.put("children", list2); 

     List list = new ArrayList(); 
     list.add(m2); 

     m.put("children", list); 

     Gson gson = new Gson(); 
     System.out.println(gson.toJson(m));  
    } 

}

產生

{ 
    "name":"food", 
    "children":[ 
     { 
     "name":"pizza", 
     "children":[ 
      { 
       "name":"peperoni" 
      }, 
      { 
       "name":"cheese" 
      } 
     ] 
     } 
    ] 
}

你看，「[」是JSON列表/數組的開頭

來源

2014-01-29 23:35:18 Leo

如何將數據格式化爲特定的JSON格式

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