使用JSON数据

Question

[ 
{ 
    "name": "Test", 
    "type": "Private", 
    "item":[{"itmeNo":"PT-15003C","quantity":"3"}, 
      {"itmeNo":"PT-15003C","quantity":"3"}], 

    "successMsg":"Item(s) added to the job list." 
    } 
] 

嗨， 我使用json.Above是我的JSON数据做数据参数在表单中输入多个数据一起，我想在一个形式，其中需要输入产品编号和数量一起进入这个数据。如何使用json使用数据参数化来完成。 当有一个关键一个值对，然后我的代码正在工作，但在这种情况下，任何人都可以帮助我获得解决方案吗？我已经为单个密钥对值编写了以下代码。

public static Object[][] getData(String path) { 
    JSONParser parser = new JSONParser(); 
    JSONArray jArray = null; 
    Object[][] testData = null; 
    try { 
     jArray = (JSONArray) parser.parse(new FileReader(System.getProperty("user.dir") + path)); 
     testData = new Object[jArray.size()][1]; 
     Hashtable<String, String> table = new Hashtable<String, String>(); 
     int i = 0; 
     for (Object obj : jArray) { 
      table = new Hashtable<String, String>(); 
      JSONObject objJson = (JSONObject) obj; 
      Set<?> keys = objJson.keySet(); 
      Iterator a = keys.iterator(); 
      while (a.hasNext()) { 
       String key = (String) a.next(); 
       String value = (String) objJson.get(key); 
       // System.out.print("key : "+key); 
       // System.out.println(" value :"+value); 
       table.put(key, value); 
      } 
      testData[i][0] = table; 
      i++; 
     } 
     return testData; 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (ParseException e) { 
     e.printStackTrace(); 
    } 
    return null; 
} 

Answer 1

这很容易。首先创建一个类，让我们说TestObject.java和Item.java如下，以适应您的JSON结构。

TestObject.java

import java.util.List; 

public class TestObject { 
    private String name; 
    private String type; 
    private List<Item> items; 
    private String successMsg; 

    /** 
    * @return the name 
    */ 
    public String getName() { 
     return name; 
    } 
    /** 
    * @param name the name to set 
    */ 
    public void setName(String name) { 
     this.name = name; 
    } 
    /** 
    * @return the type 
    */ 
    public String getType() { 
     return type; 
    } 
    /** 
    * @param type the type to set 
    */ 
    public void setType(String type) { 
     this.type = type; 
    } 
    /** 
    * @return the items 
    */ 
    public List<Item> getItems() { 
     return items; 
    } 
    /** 
    * @param items the items to set 
    */ 
    public void setItems(List<Item> items) { 
     this.items = items; 
    } 
    /** 
    * @return the successMsg 
    */ 
    public String getSuccessMsg() { 
     return successMsg; 
    } 
    /** 
    * @param successMsg the successMsg to set 
    */ 
    public void setSuccessMsg(String successMsg) { 
     this.successMsg = successMsg; 
    } 
} 

Item.java

public class Item { 
    private String itemNo; 
    private int qty; 

    /** 
    * @return the itemNo 
    */ 
    public String getItemNo() { 
     return itemNo; 
    } 
    /** 
    * @param itemNo the itemNo to set 
    */ 
    public void setItemNo(String itemNo) { 
     this.itemNo = itemNo; 
    } 
    /** 
    * @return the qty 
    */ 
    public int getQty() { 
     return qty; 
    } 
    /** 
    * @param qty the qty to set 
    */ 
    public void setQty(int qty) { 
     this.qty = qty; 
    } 

} 

现在，解析您的JSON字符串如下。下面是示例程序，这将帮助你了解的基础知识：

Test.java

import java.util.ArrayList; 
import java.util.List; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

public class Test { 

    public static void main(String[] args) { 
     TestObject testObject = new TestObject(); 
     try { 
      JSONObject jsonObject = new JSONObject("{\"name\": \"Test\"," 
                + "\"type\": \"Private\"," 
                + "\"item\":[{\"itmeNo\":\"PT-15003C\",\"quantity\":\"3\"}," 
                + "   {\"itmeNo\":\"PT-15003C\",\"quantity\":\"3\"}]," 
                + "\"successMsg\":\"Item(s) added to the job list.\"}"); //pass json string 

      JSONArray jsonArray = jsonObject.getJSONArray("item"); //get the item jsonarray 

      testObject.setName(jsonObject.getString("name")); 
      testObject.setType(jsonObject.getString("type")); 

      List<Item> items = new ArrayList<>(); 
      Item item = null; 

      //Iterate the item array and add to the itemlist object 
      for (int i = 0; i < jsonArray.length() ; i++) { 
       JSONObject jsonItem = jsonArray.getJSONObject(i); 
       String itmeNo = jsonItem.getString("itmeNo"); 
       String quantity = jsonItem.getString("quantity"); 
       item = new Item(); 
       item.setItemNo(itmeNo); 
       item.setQty(Integer.parseInt(quantity)); 
       items.add(item); 
      } 

      testObject.setItems(items); 
      testObject.setSuccessMsg(jsonObject.getString("successMsg")); //Now you will have a testObject which have all values from json. 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
    } 


}