文件复制

    如下代码实现一个文件内容的拷贝,原文件为b.txt,拷贝生成的文件为b.txt_bak.

package com.hxl;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.StringReader;

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

        File file = new File("C:\\dir\\b.txt_bak");
        // System.out.println(file.getAbsolutePath());


        FileOutputStream fos = new FileOutputStream("C:\\dir\\b.txt_bak");
        OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
        BufferedWriter out = new BufferedWriter(osw);

        if (!(file.exists())) {
            if (!(file.createNewFile())) {
                System.out.println("The file created failed!");
            }
            System.out.println(file.getAbsolutePath());
        }
        ;

        StringReader in = new StringReader(
                BufferedInputFile.read("C:\\dir\\b.txt"));

        int c;
        while ((c = in.read()) != -1) {
            System.out.print((char) c);
            if (c == '\n') {
                out.newLine();
            } else {
                out.write(c);
            }
        }
        out.flush();
    }

}

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