文件读写概要

package com.li.javase;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.InputStream;import java.io.OutputStream;import java.io.Writer;public class TestArray {//字节流读写public static void file1(){File fl1 = new File("ccc.gif");File fl2 = new File("bbb.gif");try{InputStream is = new FileInputStream(fl2);OutputStream os = new FileOutputStream(fl1);int len = 0;byte [] b1 = new byte[1024];while((len = is.read(b1))!=-1){os.write(b1, 0, len);}is.close();os.close();}catch(Exception e){e.printStackTrace();}}//字节流写public static void file2(){File fl1 = new File("str.txt");String s = "this is a String!这是字符串哦 ";try {OutputStream os = new FileOutputStream(fl1);byte [] b = s.getBytes();os.write(b);os.close();} catch (Exception e) {}}//字符流写public static void file3(){File fl1 = new File("str.txt");String s = "this is a String!这是字符串哦ddddddd ";try {Writer writer = new FileWriter(fl1);//Reader reader = new FileReader(fl1);char [] c = s.toCharArray();writer.write(c);writer.close();} catch (Exception e) {}}/** * 在Java中IO操作也是有相应步骤的，以文件操作为例，主要的操作流程如下：1 使用File类打开一个文件2 通过字节流或字符流的子类，指定输出的位置3 进行读/写操作4 关闭输入/输出字节流抽象类：InputStream/OutputStream根据需要选择子类进行文件读写即可字符流抽象类：Writer/Reader同样根据需要选择子类进行文件读写即可一般中文由字符流处理，二进制文件由字节流处理 *//** * @param args */public static void main(String[] args) {//file1();//file2();file3();}}