10040---Java IO --缓冲流

来源：互联网发布：淘宝服务器品牌编辑：程序博客网时间：2024/05/19 14:40

//使用BufferedInputStream和BufferedOutputStream实现非文本文件的复制@Testpublic void testBufferedInputOutputStream(){BufferedInputStream bis = null;BufferedOutputStream bos = null;try {//1.提供读入、写出的文件File file1 = new File("1.jpg");File file2 = new File("2.jpg");//2.想创建相应的节点流：FileInputStream、FileOutputStreamFileInputStream fis = new FileInputStream(file1);FileOutputStream fos = new FileOutputStream(file2);//3.将创建的节点流的对象作为形参传递给缓冲流的构造器中bis = new BufferedInputStream(fis);bos = new BufferedOutputStream(fos);//4.具体的实现文件复制的操作byte[] b = new byte[1024];int len;while((len = bis.read(b)) != -1){bos.write(b, 0, len);bos.flush();}}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{//5.关闭相应的流if(bos != null){try {bos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(bis != null){try {bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

---

bos.flush();

---

缓冲流（处理流的一种,可以提升文件操作的效率）
BufferedInputStream
BufferedOutputStream (flush())
BufferedReader (readLine())
BufferedWriter (flush())

实际的开发中，用的是BufferedXXX类，不用FileXXX，因为前者效率高。

----

@Testpublic void testBufferedReader(){BufferedReader br = null;BufferedWriter bw = null;try {File file = new File("dbcp.txt");File file1 = new File("dbcp3.txt");FileReader fr = new FileReader(file);FileWriter fw = new FileWriter(file1);br = new BufferedReader(fr);bw = new BufferedWriter(fw);//char[] c = new char[1024];//int len;//while((len = br.read(c))!= -1){//String str = new String(c, 0, len);//System.out.print(str);//}String str;while((str = br.readLine()) != null){//System.out.println(str);bw.write(str + "\n");//bw.newLine();bw.flush();}}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(bw != null){try {bw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(br != null){try {br.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

0 0