IO流--五种方式复制文本文件

最新推荐文章于 2024-04-01 21:42:39 发布

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最新推荐文章于 2024-04-01 21:42:39 发布

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文章标签： java

原文链接：http://www.cnblogs.com/neuhao/p/6491258.html

本文介绍了一种使用Java实现文件复制的方法，重点展示了五种不同的复制技术。这些技术涵盖了从逐字符复制到使用缓冲区进行高效数据传输的过程。通过具体代码示例，读者可以了解如何利用Java的文件读写API来实现高效的文件复制。

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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
 * 数据源：
 *         a.txt -- FileReader -- BufferdReader
 * 目的地：
 *         b.txt -- FileWriter -- BufferedWriter
 * 推荐使用第五种
 */
public class CopyFileDemo {
    public static void main(String[] args) throws IOException {
        String srcString = "a.txt";
        String destString = "b.txt";
        // method1(srcString, destString);
        // method2(srcString, destString);
        // method3(srcString, destString);
        // method4(srcString, destString);
        method5(srcString, destString);
    }

    // 字符缓冲流一次读写一个字符串
    private static void method5(String srcString, String destString) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(srcString));
        BufferedWriter bw = new BufferedWriter(new FileWriter(destString));

        String line = null;
        while ((line = br.readLine()) != null) {
            bw.write(line);
            bw.newLine();
            bw.flush();
        }

        bw.close();
        br.close();
    }

    // 字符缓冲流一次读写一个字符数组
    private static void method4(String srcString, String destString) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(srcString));
        BufferedWriter bw = new BufferedWriter(new FileWriter(destString));

        char[] chs = new char[1024];
        int len = 0;
        while ((len = br.read(chs)) != -1) {
            bw.write(chs, 0, len);
        }

        bw.close();
        br.close();
    }

    // 字符缓冲流一次读写一个字符
    private static void method3(String srcString, String destString) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(srcString));
        BufferedWriter bw = new BufferedWriter(new FileWriter(destString));

        int ch = 0;
        while ((ch = br.read()) != -1) {
            bw.write(ch);
        }

        bw.close();
        br.close();
    }

    // 基本字符流一次读写一个字符数组
    private static void method2(String srcString, String destString) throws IOException {
        FileReader fr = new FileReader(srcString);
        FileWriter fw = new FileWriter(destString);

        char[] chs = new char[1024];
        int len = 0;
        while ((len = fr.read(chs)) != -1) {
            fw.write(chs, 0, len);
        }

        fw.close();
        fr.close();
    }

    // 基本字符流一次读写一个字符
    private static void method1(String srcString, String destString) throws IOException {
        FileReader fr = new FileReader(srcString);
        FileWriter fw = new FileWriter(destString);

        int ch = 0;
        while ((ch = fr.read()) != -1) {
            fw.write(ch);
        }

        fw.close();
        fr.close();
    }
}

转载于:https://www.cnblogs.com/neuhao/p/6491258.html