java 文件读写_FileInputStream_File

package test;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class Test {

public static void main(String arg[]) {

String fileName = "E:\\share\\test.txt";

File file = new File(fileName);

String writeData = "HelloWorld!\r\nnihao我的内存是2G的 ";

byte[] byteOutData = writeData.getBytes();

byte[] byteInData = new byte[20];

int length = 0;

if (file.isFile()) {

file.delete();

}

try {

if (file.createNewFile() && file.canWrite()) {

FileOutputStream fileOutStream = new FileOutputStream(file);

fileOutStream.write(byteOutData);

fileOutStream.close();

}

if (file.canRead()) {

FileInputStream fileInStream = new FileInputStream(file);

while ((length = fileInStream.read(byteInData)) != -1) {

System.out.print(new String(byteInData, 0, lenght));

}

fileInStream.close();

}

} catch (IOException e) {

System.out.println("IOException occur");

e.getMessage();

}

}

}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/whb3118/archive/2009/12/29/5099577.aspx