Java IO 输入输出流 实例解释
- package IO;
- /*
- * Java In Out 输入输出流
- * Date:2014.02.21
- * Author:璀若星辰
- *reference
- * */
- import java.io.BufferedInputStream;
- import java.io.BufferedReader;
- import java.io.BufferedWriter;
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
- import java.io.InputStreamReader;
- import java.io.OutputStreamWriter;
- import java.util.ArrayList;
- import java.util.List;
- /*主要操作的内容：
- * 1.字节流： 图片， 2.字符流 （字符文件 .html .java .txt）
- *
- *
- * */
- public class testIO {
- //读 字符输入流
- public static List<String>testCharInput() throws Exception {
- FileInputStream fis = new FileInputStream(“D:/1.txt”);
- try {
- InputStreamReader isr = new InputStreamReader(fis, “gb2312”);
- try{
- BufferedReader br = new BufferedReader(isr);
- try{
- List<String> all = new ArrayList<String>();
- String temp = br.readLine();
- while(temp!=null) {
- System.out.println(“temp=”+temp);
- all.add(temp);
- System.out.println(“all= “+all);
- temp= br.readLine();
- }
- return all;
- }finally{
- br.close();
- }
- }finally{
- isr.close();
- }
- } finally{
- fis.close();
- }
- }
- // 读 字节流
- public static void testByteInputStream() throws Exception {
- FileInputStream fis = new FileInputStream(“D:/1.txt”);
- try {
- BufferedInputStream bis = new BufferedInputStream(fis);
- try {
- byte[] bs = new byte[1024]; //1024的长度可改
- while (bis.read(bs, 0, 1024) != -1) {
- System.out.print(“bs=”+new String(bs));
- }
- } finally {
- bis.close();
- }
- } finally {
- fis.close();
- }
- }
- //写 字符流
- public static void testCharOutput(List<String>list) throws Exception{
- FileOutputStream fos = new FileOutputStream(“d:/1.txt”);
- try{
- OutputStreamWriter osw = new OutputStreamWriter(fos,”utf-8″);//文件的编码
- try{
- BufferedWriter bw = new BufferedWriter(osw);
- try{
- for(String line:list){
- bw.write(line);
- bw.newLine();//使用newLine()换行 \n
- }
- System.out.println(“success”);
- }finally{
- bw.close();
- }
- }finally{
- osw.close();
- }
- }finally{
- fos.close();
- }
- }
- public static void main(String[] args) throws Exception {
- //testIO.testCharInput();
- //testIO.testByteInputStream();
- ArrayList<String> list = new ArrayList<String>();
- list.add(“Happy”);
- list.add(“Boy”);
- testIO.testCharOutput(list);
- testIO.testByteInputStream();
- }
- //写入内容时不想删除原来的文本，可以先读出来保存下来，然后和新内容一起写入文本，此处不再赘述
- }
