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）

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();
    }
}