JAVA IO最常用类及实例

java.io.*

最常用的几个类：

     FileImputStream   FileOutputStream

     InputStreamReader OutPutStreamWriter

测试代码：

package com.tiger.io;
import java.io.*;


public class IoTest {

public static void main(String[] args) {

    //创建文件
File a=new File("e://testCreateFile.txt");
try {
a.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

    //写文件
FileOutputStream outputStream =null;
try {
 outputStream =new FileOutputStream(a);
OutputStreamWriter streamWriter=new OutputStreamWriter(outputStream);
streamWriter.write("测试写文件");
streamWriter.close();
outputStream.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

//测试读文件
FileInputStream inputStream;
byte[] b=new byte[100];
try {
inputStream = new FileInputStream(a);
InputStreamReader streamReader =new InputStreamReader(inputStream);
inputStream.read(b);
System.out.println(new String(b));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}



}





}