JAVA程序设计第八章讲述.ppt

InputStreamReader类的构造方法 InputStreamReader(InputStream in) InputStreamReader(InputStream in , String CharsetName) public String getEncoding() OutputStreamWriter(OutputStream out) OutputStreamWriter(OutputStream out , String CharsetName) public String getEncoding() OutputStreamWriter类的构造方法 8.3.2 字节/字符转换流 为了达到最好的效率，避免频繁地在字节和字符间的相互转换，最好不要直接使用InputStreamReader和OutputStreamWriter读写数据，应尽量使用BufferedReader类来包装InputStreamReader类，使用BufferedWriter类来包装OutputStreamWriter类。 BufferedWriter out=new BufferedWriter(new OutputStreamWriter(System.out)) BufferedReader in=new BufferedReader(new InputStreamReader(System.in)) 编程实例：BufferedTest.java 8.3.2 字节/字符转换流 InputStreamReader isr=new InputStreamReader(System.in); BufferedReader br=new BufferedReader(isr); String strLine=br.readLine(); 思考：怎样用一种简单的方式一下就读取到键盘上输入的一整行字符？ 8.3.2 字节/字符转换流 8.3.3 文件字符流 FileReader类声明如下: public class FileReader extends InputStreamReader { public FileReader(String fileName) throws FileNotFoundException public FileReader(File file) throws FileNotFoundException } FileWriter类声明如下: public class FileWriter extends OutputStreamWriter { public FileWriter(String fileName) throws IOException public FileWriter(String fileName, boolean append) throws IOException public FileWriter(File file) throws IOException public FileWriter(File file, boolean append) throws IOException } 8.3.3 文件字符流 文件复制操作：FileCopyTest.java 8.3.4 缓冲字符流 Public class BufferedReader extends Reader{ public BufferedReader(Reader in) public BufferedReader(Reader in, int sz) public String readLine() throws IOException } BufferedReader类声明如下： Public class BufferedWriter extends Writer{ public BufferedWriter(Writer out) public BufferedWriter(Writer out, int sz) public void newLine() throws IOException } BufferedWriter类声明如下： 将读取到的换行符自动丢弃，输入流结束时返回null BufferedInputStream bis=new BufferedInputStream (new FileInputStream(D\\电影\\猫和老鼠\\cd1.rmvb) //bis有一个默认的缓冲区，大小为32个字节 byte [] buf=new b