BufferedWriter不写入文件 [英] BufferedWriter isnt writing to file

问题描述

我必须从用户那里获取用户的名称和地址，并将其放入textfile中。我写下面的代码：

I have to take name and address of user from user and put it into textfile. I write following code:

package selfTest.nameAndAddress;

import com.intellij.codeInsight.template.postfix.templates.SoutPostfixTemplate;

import java.io.*;
import java.util.Arrays;

/**
 * Created by 
 */
public class Test {
    public static void main(String[] args) throws IOException {
        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br=new BufferedReader(isr);


        //creating addressbook text file
        File fl=new File("E:/addressbook.txt");
        fl.createNewFile();

        FileReader fr=new FileReader(fl);
        BufferedReader in=new BufferedReader(fr);



        boolean eof=false;
        int inChar=0;

        String[] name=new String[2];
        String[] address=new String[2];

        int counter=0;


        do{
            FileWriter fw=new FileWriter(fl);
            BufferedWriter out=new BufferedWriter(fw);

            System.out.println("Enter "+(counter+1)+" students name "+" and address");

            name[counter]=br.readLine();
            address[counter]=br.readLine();

            out.write(name[counter]);
            System.out.println("Nmae: "+name[counter]+" ddress: "+address[counter]);
            counter++;
        }while(counter<2);
    }
}

当我运行代码时，需要用户输入但文本文件为空。地址和名称不会写入文本文件。如何在上面的代码中将名称和地址存储到文本文件中。

When I run the code, it takes input from user but the text file is empty. The address and name is not written into text file. How can I store the name and address into text file in the above code.

推荐答案

您创建 BufferedWriter ，但从不 flush 或 关闭 它。

You create the BufferedWriter, but never flush or close it.

这些操作是实际写入文件的内容

These operations are what actually write to the file

正如@ManoDestra在评论中指出的那样，Java支持 try-with-resources 语句，它允许您格式化语句，如：

As @ManoDestra pointed out in the comments, Java supports the try-with-resources statement, which allows you to format your statements like:

try(BufferedWriter out = new BufferedWriter(new FileWriter(fl))) {

由于 BufferedWriter 实现 AutoCloseable 界面，当<时，Java会自动清理 out code>尝试阻止退出

Since BufferedWriter implements the AutoCloseable interface, Java will automatically take care of cleanup of out when the try block exits

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