讀取和寫入字符串的文件用JSON在Java中

Question

我想讀的文本文件並處理它data.so例如輸入文件看起來像：

john,judd,134 
Kaufman,kim,345 

則程序應該解析和存儲這些數據在JSON文件的形式，從而將進一步processing.I'm使用JSON-simple此任務安排。而這是一個原型代碼我已經寫了：

package com.company; 

import org.json.simple.JSONObject; 

import java.io.*; 

public class Main { 


static JSONObject jsonObject = new JSONObject(); 
static String output; 

public static void main(String[] args) throws IOException { 

    read("/Users/Sepehr/Desktop/JSONexample.txt"); 
    write("/Users/Sepehr/Desktop/JSONexampleout,txt"); 

} 

public static String read(String filenameIn) throws IOException { 

    BufferedReader bufferedReader = new BufferedReader(new FileReader(filenameIn)); 
    String s ; 

    while ((s = bufferedReader.readLine()) != null) 

    { 
     String[] stringsArr = s.split(","); 


     jsonObject.put("famname" , stringsArr[0]); 
     jsonObject.put("name" , stringsArr[1]); 
     jsonObject.put("id", stringsArr[2]); 

     bufferedReader.close(); 


    } 

    return output=jsonObject.toJSONString(); 


} 


public static String write(String filenameOut) throws FileNotFoundException { 

    PrintWriter printWriter = new PrintWriter(filenameOut); 
    printWriter.write(jsonObject.toJSONString()); 
    printWriter.close(); 

    String se = "yaaayyy :|"; 
    return se; 

} 



} 

運行該程序後，這些是例外我得到：

Exception in thread "main" java.io.IOException: Stream closed 
at java.io.BufferedReader.ensureOpen(BufferedReader.java:97) 
at java.io.BufferedReader.readLine(BufferedReader.java:292) 
at java.io.BufferedReader.readLine(BufferedReader.java:362) 
at com.company.Main.read(Main.java:30) 
at com.company.Main.main(Main.java:18) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:597) 
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140) 

究竟是什麼錯誤？

以及如何爲這個程序做出更好的設計？

Answer 1

您關閉的BufferedReader在循環

while ((s = bufferedReader.readLine()) != null) 

    { 
     String[] stringsArr = s.split(","); 


     jsonObject.put("famname" , stringsArr[0]); 
     jsonObject.put("name" , stringsArr[1]); 
     jsonObject.put("id", stringsArr[2]); 

     //************* 
     bufferedReader.close(); // don't close the reader! 
     //************* 

    }