Java SE 095 Java字符流详解 续_免费下载.docx

Java SE 095 Java字符流详解 续一、FileWriterFileWriter创建一个可以写文件的Writer类。FileWriter继承于OutputStreamWriter。它最常用的构造方法如下：FileWriter(String filePath);FileWriter(String filePath,boolean append);FileWriter(File fileObj)append:如果为true,则将字节写入文本末尾处，而不是写入文件开始处。package com.javase.io2;import java.io.FileWriter;public class FileWriter1 public static void main(String args) throws Exception String str = hello world welcome nihao;/FileWriter操纵的是字符或者是字符数组，字符串与字符数组是两个不同的对象，可以将其转换成字符数组char buffer = new charstr.length();/将字符串儿里面的内容复制到buffer数组str.getChars(0, str.length(), buffer, 0);FileWriter writer = new FileWriter(file2.txt);for(int i = 0 ; i buffer.length; i+)writer.write(bufferi);writer.close();package com.javase.io2;import java.io.CharArrayReader;public class CharArrayReader1 public static void main(String args) throws Exception String tmp = Liu Manlin I love you!;char ch = new chartmp.length();tmp.getChars(0, tmp.length(), ch, 0);CharArrayReader car = new CharArrayReader(ch);int i;while(-1!=(i = car.read()System.out.println(char)i);这个类既能读，又能写！package com.javase.io2;import java.io.IOException;import java.io.RandomAccessFile;public class RandomAccessFile1 public static void main(String args) throws IOException Person p = new Person(1,Jie Lin,160);RandomAccessFile raf = new RandomAccessFile(test.txt,rw);p.write(raf);Person p1 = new Person();raf.seek(0);/让读的位置重新回到文件开头p1.read(raf);System.out.println(p1.id+ ++ +p1.height);class Personint id;String name;double height;public Person()public Person(int id,String name,double height)this.id = id; = name;this.height = height;public void write(RandomAccessFile raf) throws IOExceptionraf.writeInt(id);raf.writeUTF(name);raf.writeDouble(height);public void read(RandomAccessFile raf) throws I