IO流之复制文件的五种方式（读取一个字符，读取一个字符数组，缓冲流读取一个字符，读取一个字符数组，读取一行）

本文链接：https://blog.youkuaiyun.com/AFacetoj/article/details/88842965

本文介绍了一种使用Java实现文件复制的方法，通过五种不同的方式展示了如何从一个文件读取内容并将其写入另一个文件中。这些方法包括直接使用FileReader和FileWriter、利用字符数组进行缓冲读取、使用BufferedReader和BufferedWriter提高效率以及按行读取文件内容。

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package IOliu.DemoCopyFive;

import org.omg.CosNaming.NamingContextExtPackage.StringNameHelper;

import java.io.*;

public class    DemoTest {
    static String srcFileName="F:\\untitledxuexi\\src\\IOliu\\DemoCopyFive\\DemoTest.java";
    static String desFileName="F:\\untitledxuexi\\src\\IOliu\\DemoCopyFive\\DemoCopy.txt";

    public static void main(String[] args) throws IOException{
      method1();
      method2();
      method3();
      method4();
      method5();

    }
    public static void method1() throws IOException{
        FileReader fr=new FileReader(srcFileName);
        FileWriter fw=new FileWriter(desFileName);
        int ch;
        while ((ch=fr.read())!=-1){
            fw.write(ch);
        }
        fw.close();
        fw.close();
    }
    public static void method2() throws IOException{
        FileReader fr=new FileReader(srcFileName);
        FileWriter fw=new FileWriter(desFileName);
        char chs[]=new char[1024];
        int len;
        while ((len=fr.read(chs))!=-1){
            fw.write(chs,0,len);
        }
        fw.close();
        fr.close();
    }
    public static void method3() throws IOException{
        FileReader fr=new FileReader(srcFileName);
        FileWriter fw=new FileWriter(desFileName);
        BufferedReader br=new BufferedReader(fr);
        BufferedWriter bw=new BufferedWriter(fw);
        int ch;
        while ((ch=br.read())!=-1){
            bw.write(ch);
        }
        br.close();
        bw.close();
        fw.close();
        fr.close();

    }
    public static void method4() throws IOException{
        FileReader fr=new FileReader(srcFileName);
        FileWriter fw=new FileWriter(desFileName);
        BufferedReader br=new BufferedReader(fr);
        BufferedWriter bw=new BufferedWriter(fw);
        char chs[]=new char[1024];
        int len;
        while ((len=br.read(chs))!=-1){
            bw.write(chs,0,len);
        }
        br.close();
        bw.close();
        fw.close();
        fr.close();

    }
    public static void method5() throws IOException{
        FileReader fr=new FileReader(srcFileName);
        FileWriter fw=new FileWriter(desFileName);
        BufferedReader br=new BufferedReader(fr);
        BufferedWriter bw=new BufferedWriter(fw);
        String stu;
        while ((stu=br.readLine())!=null){
            bw.write(stu);
            bw.newLine();
            bw.flush();
        }
        bw.close();
        br.close();
        fr.close();
        fw.close();
    }
}