用Java写和读文件 [英] write and read in file in java

问题描述

我正在尝试从文件中读取，取每一行的长度，将长度写入另一个文件，然后打印第二个文件以查看写入结果，但是当我打开第二个文件时，结果却不然正是我想要的东西.运行此代码后，文件中有很多数字:

I'm trying to read from a file, take the length of the each line, write the length into another file and then print the second file to see the writing result, but when I open the second file the result is not exactly the thing that I want. There are many numbers in the file after running this code:

    String line = null;

    boolean flag = false;

    BufferedReader bf = new BufferedReader(new FileReader("c:\\lm_giga_5k_nvp_2gram.arpa"));

    BufferedWriter index = new BufferedWriter(new FileWriter("c:\\index.txt"));
    int l;

    int counter=0;

     while (( line = bf.readLine()) != null)

     {

        l=line.length();

        index.write( l + "\n" );

     }

     BufferedReader bf1 = new BufferedReader(new FileReader("c:\\index.txt"));

     String line1=null;

     while (( line1 = bf1.readLine()) != null)


     {
         System.out.println(line1);


     }

     bf.close();

     bf1.close();

请使用此示例帮助我.我关闭了索引，但是仍然有同样的问题.

Please help me using this example. I close the index, but still have the same problem.

注意:不要关注arpa文件，而可以将txt文件图像化.

Notice: Don't pay attention to arpa file you can image a txt file instead.

推荐答案

在打开其他位置之前，应先关闭index.txt.或至少flush

You should close index.txt before opening in a different place; or at least flush it:

... 
index.close();

BufferedReader bf1 = new BufferedReader(new FileReader("c:\\index.txt"));

String line1=null;
...

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