Java IO流将信息写入文本文件 .

我们在编程的时候需要把一些信息写入到文本文件中去,比如错误信息,日志信息等。这里罗列几个把信息写入文件的方法:

import java.io.*;

public class Test{
    public static void main(String[] args)
    {
        try {
            BufferedWriter bw = new BufferedWriter(new FileWriter("data.txt"));
            //文件将会创建在程序所在的文件夹中,
            //("data.txt")也可以加上路径,如:("C://data.txt"),这样就会在C盘根目录创建一个data.txt文件
            BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream("data2.txt"));
            DataOutputStream dout=new DataOutputStream(new BufferedOutputStream(new FileOutputStream("data3.txt")));
            PrintStream pout=new PrintStream(new BufferedOutputStream(new FileOutputStream("data4.txt")));
            RandomAccessFile rout=new RandomAccessFile("data5.txt","rw");//"rw"表示此文件可读可写
            PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter("data6.txt")));
           
            //设置文本内容
            StringBuilder sb=new StringBuilder("");
            sb.append("How are you?"+"/r/n");
            sb.append("Fine,thanks,and you?"+"/r/n");
            sb.append("Fine,too.");
          
            String a=sb.toString();
            byte[] b=(a).getBytes();
            //写入文件,还可以用其他方法如:write(String str)
            bw.write(a,0,b.length);
            out.write(b, 0, b.length);
            dout.write(b, 0, b.length);
            pout.write(b, 0, b.length);
            rout.write(b, 0, b.length);
            pw.print(a);
            //关闭流
             out.close();
            bw.close();
            dout.close();
            pout.close();
            rout.close();
            pw.close();
        } catch (IOException ex) {
            System.out.println(ex);
        }
     }
}


 

你可能感兴趣的:(java,编程,IO流)