Question

我正在尝试获取变量TenderType，TenderAmount和CrdName，因此我可以将它们发送到另一个将它们打印出来的类。我不认为我可以使用getter和setter，因为我在while循环中声明变量，以便org.json.simple解析器工作。还在学习：/非常感谢任何帮助！

Here is JSON:

{
    "Tender" : 
[
{
"TenderType" : "1",
"TenderAmount" : "21.00",
"CrdName" : "Visa"
}
]
}


//So for example the other class will be test() so

(FIRST CLASS)
 public class test{
  public String callvars(){
    JSONtoVar meh = new JSONtoVar(); 
   // ??? not sure the correct way to call any variable over???
   return "";
   }
  }

(SECOND CLASS)
//???Not sure what to do to return variables that are already declared inside of while Parser???
package json;
import java.io.FileReader;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class JSONtoVar {
  public int PARSEJson(){
    try {
        JSONParser parser = new JSONParser();
        Object obj = parser.parse(new FileReader("C:\\Users\\interMind\\Desktop\\variables_json.txt"));
        JSONObject jsonObject = (JSONObject) obj;
        JSONArray Tender = (JSONArray) jsonObject.get("Tender");

        @SuppressWarnings("rawtypes")
        Iterator z = Tender.iterator();
        while (z.hasNext()) {
            JSONObject innerObj = (JSONObject) z.next();

            //Trying to get these three strings Below   
            String TenderType = (String)innerObj.get("TenderType");         
            String TenderAmount = (String)innerObj.get("TenderAmount");
            String CrdName = (String)innerObj.get("CrdName");
            System.out.println("\nTender: \n" + TenderType + "\n" + TenderAmount + "\n" + CrdName);
            } 
          }
           catch (Exception e) {
           e.printStackTrace();           
         }
   return 1;
  }
} //ends class

Answer 1

在类JSONtoVar中的方法parseJson中，执行以下操作

一个。将parseJson的返回类型更改为Map
```
 public Map<String,String> parseJson(){.....  }
```
湾创建一个Hashmap
```
 HashMap<String, String> tender= new HashMap<String, String>();
```
℃。在HashMap中添加TenderType，TenderAmount和CrdNo。
```
  tender.put("TenderType",TenderType);
  tender.put("TenderAmount",TenderAmount);
  tender.put("CrdName",CrdName);
```
d。将HashMap返回给调用者，返回招标

在调用方法（test.callvars）中创建调用者类的实例并从hashmap中检索值

JSONtoVar jsonToVar=new JSONtoVar();
HashMap<String, String> mapJson=(HashMap<String, String>)jsonToVar.parseJson();

System.out.println("mapJson TenderType "+mapJson.get("TenderType"));
System.out.println("mapJson TenderAmount "+mapJson.get("TenderAmount"));
System.out.println("mapJson CrdName "+mapJson.get("CrdName"));

示例代码

    public class myMain {

public static void main(String[] args) {

    JSONtoVar jsonToVar=new JSONtoVar();
    HashMap<String, String> mapJson=(HashMap<String, String>) jsonToVar.parseJson();

    System.out.println("mapJson TenderType "+mapJson.get("TenderType"));
    System.out.println("mapJson TenderAmount "+mapJson.get("TenderAmount"));
    System.out.println("mapJson CrdName "+mapJson.get("CrdName"));

   }

 }

 class JSONtoVar {

    public Map<String,String> parseJson(){

    HashMap<String, String> tender= new HashMap<String, String>();

    /*
        Get the value from JSON and set value.This has already be done          by you

    */

     tender.put("TenderType",TenderType)    ;
     tender.put("TenderAmount",TenderAmount);
     tender.put("CrdName",CrdName);


    return tender;



  }
}

使用org.json.simple json解析器将变量从while循环传递到另一个类

1 个答案: