1501 王奕开 实验9

1.思维导图：

1. package test;
   import java.io.*;
   public class Test{
   public static void main(String args[]) {
   FileInputStream in=null;
   FileOutputStream out=null;
   File fSource=new File("d:"+File.separator+"my.jpg");
   File fDest=new File("d:"+File.separator+"java"+File.separator+"my.jpg");
   if(!fSource.exists()){
   System.out.println("源文件不存在");
   System.exit(1);
   }
   if(!fDest.getParentFile().exists()){
   fDest.getParentFile().mkdirs();
   }
   try {
   in=new FileInputStream(fSource);
   out=new FileOutputStream(fDest);
   int len=0;
   long begintime = System.currentTimeMillis();
   while((len=in.read())!=-1){
   out.write(len);
   }
   long endtime = System.currentTimeMillis();
   System.out.println("文件拷贝完成，耗时"
   +(endtime-begintime)+"毫秒");
   }catch(Exception e){
   System.out.println("文件操作失败");
   }finally{
   try {
   in.close();
   out.close();
   } catch (IOException e) {
   e.printStackTrace();
   }
   }
   }
   }

使用BufferedInputSream和用BufferedOut putSream修改：
package test;

import java.io.*;
public class Test{
public static void main(String args[]) {
FileInputStream in=null;
FileOutputStream out=null;
File fSource=new File("d:"+File.separator+"my.jpg");
File fDest=new File("d:"+File.separator+"java"+File.separator+"my.jpg");
if(!fSource.exists()){
System.out.println("源文件不存在");
System.exit(1);
}
if(!fDest.getParentFile().exists()){
fDest.getParentFile().mkdirs();
}
try {
in=new FileInputStream(fSource);
out=new FileOutputStream(fDest);
byte[]b=new byte[1];
BufferedInputStream q = new BufferedInputStream(in);
BufferedOutputStream m=new BufferedOutputStream(out);
int len=0;
long begintime = System.currentTimeMillis();
while((len=in.read())!=-1){
m.write(len);
}
long endtime = System.currentTimeMillis();
System.out.println("文件拷贝完成，耗时"
+(endtime-begintime)+"毫秒");
}catch(Exception e){
System.out.println("文件操作失败");
}finally{
try {
in.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

3.代码托管

https://git.oschina.net/wangyikai1996/shiyan9.git