Java的输入输出流

Java的输入输出流分为字节流和字符流

InputStream/Reader：所有输入流的基类，前者是字节输入流，后者是字符输入流

OutputStream/Writer：所有输出流的基类，前者是字节输出流，后者是字符输出流

FileInputStream/FileReader分别继承InputStream/Reader实现输入流操作：

字节流输入：

import java.io.FileInputStream;import java.io.IOException;//import java.io.File;public class FileInputStreamTest  {public static void main(String[] args) throws IOException {//创建字节输入流FileInputStream fis = new FileInputStream("F:\\Project\\HelloJava\\src\\IO\\FileInputStreamTest.java");//创建一个长度为1024的“竹筒”byte[] bbuf = new byte[1024];// 用户保存实际读取的字节数int hasRead = 0;while((hasRead = fis.read(bbuf)) > 0) {System.out.print(new String(bbuf, 0, hasRead) );}fis.close();}}

字符流输入：

import java.io.IOException;import java.io.FileReader;public class FileReaderTest {public static void main(String[] args) throws IOException {FileReader fr = new FileReader("F:\\Project\\HelloJava\\src\\IO\\FileReaderTest.java");try {char[] cbuf = new char[32];int hasRead = 0;while((hasRead = fr.read(cbuf) ) > 0) {System.out.print(new String(cbuf, 0, hasRead) );}}catch(IOException ex) {ex.printStackTrace();}}}

字节输出流：

import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class FileOutputStreamTest {public static void main(String[] args) throws IOException {//创建字节输入流FileInputStream fis = new FileInputStream("F:\\Project\\HelloJava\\src\\IO\\FileOutputStreamTest.java");//创建字节输出流FileOutputStream fos = new FileOutputStream("F:\\Project\\HelloJava\\src\\IO\\new.txt");try {byte[] bbuf = new byte[1024];int hasRead = 0;while((hasRead = fis.read(bbuf) ) > 0) {fos.write(bbuf, 0, hasRead);}}catch (IOException ioe) {ioe.printStackTrace();}}}