java 临时文件使用方法

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.File;

public class tmp
{
        public static void main(String args[]) throws Exception
        {
                File tmpfile = File.createTempFile("sky", null);
                System.out.println("temporary file create success.");

                BufferedWriter writer = new BufferedWriter(new FileWriter(tmpfile));
                writer.write("hello world\r\n");
                writer.flush();
                writer.close();

                BufferedReader reader = new BufferedReader(new FileReader(tmpfile));
                String str = reader.readLine();
                System.out.println(str);
                reader.close();

                tmpfile.deleteOnExit();
                System.out.println("temporary file delete success.");
        }
}