我想读取一个文本文件并处理它的数据。例如输入文件将如下所示:
john,judd,134
Kaufman,kim,345
然后程序应该以 JSON 文件的形式解析和存储这些数据,以便将其组织起来以供进一步处理。我正在使用 JSON-simple对于这个任务。这是我编写的原型(prototype)代码:
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;
}
}
运行程序后,我得到以下异常:
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)
到底出了什么问题?
应该如何更好地设计这个程序?
最佳答案
您正在关闭循环中的 BufferedReader
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!
//*************
}
关于java - 在java中使用JSON读取和写入字符串文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29387152/