Java操作文本文件的方法(2)

　　FileWriter fw = new FileWriter("hello.txt");
　　String s = "hello world";
　　fw.write(s,0,s.length());
　　fw.flush();

　　OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("hello2.txt"));
　　osw.write(s,0,s.length());
　　osw.flush();

　　PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("hello3.txt")),true);
　　pw.println(s);

　　不要忘记用完后关闭流！下面是个小例子，帮助新手理解。其实有的时候java的IO系统是需要我们多记记的，不然哪天就生疏了。

　　hello world i like java language

　　import java.io.*;

　　public class TestFile2
　　{
　　public static void main(String[] args) throws IOException
　　{
　　FileReader fr = new FileReader("ming.txt");
　　char[] buffer = new char[1024];
　　int ch = 0;
　　while((ch = fr.read())!=-1 )
　　{
　　　System.out.print((char)ch);
　　}

　　InputStreamReader isr = new InputStreamReader(new FileInputStream("ming.txt"));
　　while((ch = isr.read())!=-1)
　　{
　　　System.out.print((char)ch);
　　}

　　BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("ming.txt")));
　　String data = null;
　　while((data = br.readLine())!=null)
　　{
　　　System.out.println(data);
　　}

　　FileWriter fw = new FileWriter("hello.txt");
　　String s = "hello world";
　　fw.write(s,0,s.length());
　　fw.flush();

　　OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("hello2.txt"));
　　osw.write(s,0,s.length());
　　osw.flush();

　　PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("hello3.txt")),true);
　　pw.println(s);

　　fr.close();
　　isr.close();
　　br.close();
　　fw.close();
　　osw.close();
　　pw.close();
　　}
　　}