Java实现本地 fileCopy

前言：

　　Java中流是重要的内容，基础的文件读写与拷贝知识点是很多面试的考点。故通过本文进行简单测试总结。

2.图展示【文本IO/二进制IO】(这是参考自网上的一张总结图，相当经典，方便对比记忆)

3.文本复制的实验Java实现code:

 package com.gdufe.io;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;

 public class TestInputOutputStream {

 //    private final static String SOURCE="t.txt";
 //    private final static String TARGET="tt.txt";
 //    private final static String SOURCE="p.png";
 //    private final static String TARGET="pp.png";
     private final static String SOURCE="D:\\Tool_Software\\mysql-installer-community-5.6.23.0.msi";
     private final static String TARGET="mysql-installer-community-5.6.23.0.msi";
     //D:\Tool_Software\Ryuyan.zip

     public static void main(String[] args) {
 //        TestInputOutputStream.copy1(SOURCE, TARGET);
 //        TestInputOutputStream.copy2(SOURCE, TARGET);
         TestInputOutputStream.copy3(SOURCE, TARGET);
         System.out.println("--End---");
     }

     public static void copy1(String src,String tar){

         InputStream input = null;
         OutputStream output = null;
         try{
             input = new FileInputStream(src);
             output = new FileOutputStream(tar);
             int r;
             while((r=input.read())!=-1){
                 output.write((byte)r);
             }
         }catch(Exception e){
             e.printStackTrace();
         }finally{
             try {
                 input.close();
                 output.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

     }
     public static void copy2(String src,String tar){
         InputStream input = null;
         OutputStream output = null;
         try{
             input = new FileInputStream(src);
             output = new FileOutputStream(tar);
             int length=0;
             byte []b  = new byte[1024];
             while((length=input.read(b))!=-1){
                 output.write(b,0,length);
             }
         }catch(Exception e){
             e.printStackTrace();
         }finally{
             try {
                 input.close();
                 output.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }

     public static void copy3(String src,String tar){
         InputStream input = null;
         OutputStream output = null;
         try{
             input = new DataInputStream(new BufferedInputStream(new FileInputStream(src)));
             output = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(tar)));
             /***经过亲测，buffer缓冲流读取时确实更快一些****/

             int length=0;
             byte []b  = new byte[1024];    //先将stream读入字节数组
             while((length=input.read(b))!=-1){
                 output.write(b,0,length);
             }
         }catch(Exception e){
             e.printStackTrace();
         }finally{
             try {
                 input.close();
                 output.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }
 }

（附：参考代码时注意准备好测试文件，不然出现异常“file can't be found”！

　　文件拷贝到Java工程的直接目录下，刷新project可查看！

）