java的IO流的一些测试

public class Demo02 {
public static void main(String[] args) {
//获取当前毫秒值，用于测试
long l = System.currentTimeMillis();
//创建文件对象,需要读取的文件
File file = new File("F:/java/sql语句的执行顺序.txt");
//写入的文件
File file2 = new File("F:/test2.txt");
//创建字节输入流和输出流
BufferedInputStream in=null;
BufferedOutputStream out=null;
//创建一个存储数据的字节数组
byte [] b=new byte [3];
try {
in =new BufferedInputStream(  new FileInputStream(file));
out = new BufferedOutputStream(new FileOutputStream(file2));
int read=0;
//如果没有数据了会返回-1；如果还有会返回数据的长度
while ((read = in.read(b))!=-1) {
//读取多少输出多少
out.write(b,0,read);
}
//刷新
out.flush();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//关流
if(out!=null){
try {

out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(in!=null){
try {

in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
long m = System.currentTimeMillis();
System.out.println(m-l);
}

//-------------------------------------------------------------------------------------------------------------
public static void demo02(){

long l = System.currentTimeMillis();
//创建文件对象,需要读取的文件
File file = new File("F:/java/sql语句的执行顺序.txt");
//写入的文件
File file2 = new File("F:/test2.txt");
//创建字节输入流和输出流
FileOutputStream out=null;
FileInputStream in=null;
//创建一个存储数据的字节数组
byte [] b=new byte [3];
try {
in = new FileInputStream(file);
out = new FileOutputStream(file2);
int read=0;
//如果没有数据了会返回-1；如果还有会返回数据的长度
while ((read = in.read(b))!=-1) {
//读取多少输出多少
out.write(b,0,read);
}
//刷新
out.flush();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//关流
if(out!=null){
try {

out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(in!=null){
try {

in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
long m = System.currentTimeMillis();
System.out.println(m-l);
}
}

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