使用当前的日期时间作为log文件名字

1，/* * 自动化测试，每一次运行会生成一个log，使用当前的日期时间作为log文件名字会带来方便,用该log文件来记录所有的输入输出。 */

package c1;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.io.*;
public class Test{
 public static void main(String[] args){
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd-HHmmss");
  String sLogFileName=sdf.format(new Date())+".log"; 
  TestOut testout=new TestOut(sLogFileName);

  testout.logOut("hello");
  testout.logOut("hello1");

 }
}

class TestOut{
 public String sLogFileName="";
 public TestOut(String sLogFileName){
  this.sLogFileName=sLogFileName;
  
  File logfile=new File(sLogFileName);
  try{
   logfile.createNewFile();
   logOut(sLogFileName+" was created.");
   //throw new IOException();
  }
  catch(IOException e){   
   e.printStackTrace();//System.out.println (e);
   System.out.println("failed to create file:"+sLogFileName);// print out the runtime variables
   
   //return false;
   System.exit(0); //terminate the program or Runtime.getRuntime().exit(0);   
  }
  
 }
 public void logOut(String sOut){
  System.out.println(sOut);
  
  try{
   BufferedWriter bw = new BufferedWriter( new FileWriter(sLogFileName,true));
   
    bw.write(new Date()+" -- "+sOut);
    bw.newLine();
    bw.close();
   //throw new IOException();
  }
  catch(IOException e){   
   e.printStackTrace();//System.out.println (e);
   System.out.println("failed to write "+sOut+" into file:"+sLogFileName);// print out the runtime variables
   System.exit(0); //terminate the program or Runtime.getRuntime().exit(0);
  }

 } 
}
/*
输出结果：
2010-01-18-102901.log was created.
hello
hello1

log文件2010-01-18-102901.log内容：
Mon Jan 18 10:29:01 CST 2010 -- 2010-01-18-102901.log was created.
Mon Jan 18 10:29:01 CST 2010 -- hello
Mon Jan 18 10:29:01 CST 2010 -- hello1
*/

 

2，用static方法重写此类，事情变得更简单。

/*
 * 自动化测试，每一次运行会生成一个log，使用当前的日期时间作为log文件名字会带来方便
*/
package c1;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.io.*;
public class Test{
 public static void main(String[] args){
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd-HHmmss");
  String sLogFileName=sdf.format(new Date())+".log"; 
  TestOut.sLogFileName=sLogFileName;

  TestOut.logOut("hello");
  TestOut.logOut("hello1");

 }
}

class TestOut{
 public static String sLogFileName="";

 public static void logOut(String sOut){
  System.out.println(sOut);
  
  try{
   BufferedWriter bw = new BufferedWriter( new FileWriter(sLogFileName,true));
   
    bw.write(new Date()+" -- "+sOut);
    bw.newLine();
    bw.close();
   //throw new IOException();
  }
  catch(IOException e){   
   e.printStackTrace();//System.out.println (e);
   System.out.println("failed to write "+sOut+" into file:"+sLogFileName);// print out the runtime variables
   System.exit(0); //terminate the program or Runtime.getRuntime().exit(0);
  }

 } 
}
/*
输出结果：
2010-01-18-102901.log was created.
hello
hello1

log文件2010-01-18-102901.log内容：
Mon Jan 18 10:29:01 CST 2010 -- 2010-01-18-102901.log was created.
Mon Jan 18 10:29:01 CST 2010 -- hello
Mon Jan 18 10:29:01 CST 2010 -- hello1
*/