Java学习日记13——File*putStream的方法

package com.sxu.cs.io;

import java.io.*;
public class FileInputStreamMethod {
static FileInputStream in = null;
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
in = new FileInputStream("G:/input.txt");
//			testRead();
//			testRead1();
//			testRead2();
testSkip();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(in!=null)
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private static void testRead(){
byte b = 0;
try {
b = (byte)in.read();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println((char)b);
}
private static void testRead1(){
byte[] bArr  = new byte[1024];
int counter = 0;
try {
counter = in.read(bArr);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.print
("the file:G:/input.txt has "+counter
+" 字节,文件内容为：");
for(int i = 0;i<bArr.length;i++)
{
System.out.print((char)bArr[i]);
}
}
private static void testRead2(){
byte[] bArr = new byte[1024];
int offset = 5;//偏移量
int length = 5;//长度
try {
in.read(bArr,offset,length);
for(int i = 0;i<bArr.length;i++)
{
System.out.print((char)bArr[i]);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static void testSkip(){
try {
long l = in.skip(5+3);
System.out.println("跳过 "+l+" 字节");
testRead1();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

package com.sxu.cs.io;

import java.io.*;

public class FileOutputStreanMethod {

public static void main(String[] args) {
// TODO Auto-generated method stub
File file = new File("G:/output.txt");
FileOutputStream out = null;
byte[] b1 ={12,34,56,78,90};
String s = "i love java";
byte[] b2 = s.getBytes();
try {
out = new FileOutputStream(file);
out.write(123);
out.write(b1);
out.write(b2);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(out != null)
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

}