[Java SE] JAVA.IO 相关--第四篇，写文件
1.以PrintWriter来实现写入
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import java.io.*;public class test {/** * @param args */public static void main(String[] args) {String path="e://a.txt";try {FileWriter fw=new FileWriter(path,true);PrintWriter pw=new PrintWriter(fw);pw.println("世界");pw.close();//bw.close();fw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace(); } }}?2.以BufferedWriter来实现写入
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import java.io.*; public class test { /** * @param args */ public static void main(String[] args) { String path="e://a.txt"; try { FileWriter fw=new FileWriter(path,true); BufferedWriter bw=new BufferedWriter(fw); bw.newLine(); bw.write("Hello"); bw.newLine(); bw.write("世界"); bw.close(); fw.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } //读文件用//BufferedReader br = new BufferedReader( new FileReader(new File("e://a.txt"))); //br.readLine();//一行一行的读 package test;import java.io.File;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.io.RandomAccessFile;public class FileRW {public static void main(String[] a) {try {FileOutputStream fos = new FileOutputStream (new File("d:\\abc.txt"),true ) ; String str = "ABC \n" ;fos.write(str.getBytes()) ;fos.close ();} catch (IOException e) {e.printStackTrace();}try {FileWriter fw = new FileWriter("d:\\abc.txt",true);PrintWriter pw=new PrintWriter(fw);pw.println("append content");pw.close () ;fw.close () ;} catch (IOException e) {e.printStackTrace();} try { RandomAccessFile rf=new RandomAccessFile("d:\\abc.txt","rw"); rf.seek(rf.length());//将指针移动到文件末尾 rf.writeBytes("Append a line again!\n"); rf.close();//关闭文件流 }catch (IOException e){e.printStackTrace(); }}}