每隔五分钟需要将数据重复性写入一个文件中。写了一段代码,但每隔五分钟新数据会将原有数据覆盖掉。请教达人如何解决这个问题。 具体代码如下:
import java.io.*;
import java.util.*;public class WriteFile
{
public static void main(String[] args)
{
final WriteFile tf = new WriteFile();
Timer t = new Timer();
try
{
t.schedule(new TimerTask(){
public void run()
{
tf.outPut();
}},0,300000);
}
catch (Exception ex4)
{
System.out.println (ex4.toString());
}
}
public void outPut()
{
try
{
File myFile = new File("E:\\newFile.txt");
myFile.createNewFile();
}
catch(Exception ex2)
{
System.out.println("can not make file");
}
try
{
PrintWriter out = new PrintWriter(new FileWriter("E:\\newFile.txt"));
for (int k = 1; k<=10; k++)
{
String serverName = "@labp2"+String.valueOf(k);
out.append(serverName);
out.append("\r\n");
}
}
catch(Exception ex3)
{
System.out.println (ex3.toString());
}
out.close();
}
}
import java.io.*;
import java.util.*;public class WriteFile
{
public static void main(String[] args)
{
final WriteFile tf = new WriteFile();
Timer t = new Timer();
try
{
t.schedule(new TimerTask(){
public void run()
{
tf.outPut();
}},0,300000);
}
catch (Exception ex4)
{
System.out.println (ex4.toString());
}
}
public void outPut()
{
try
{
File myFile = new File("E:\\newFile.txt");
myFile.createNewFile();
}
catch(Exception ex2)
{
System.out.println("can not make file");
}
try
{
PrintWriter out = new PrintWriter(new FileWriter("E:\\newFile.txt"));
for (int k = 1; k<=10; k++)
{
String serverName = "@labp2"+String.valueOf(k);
out.append(serverName);
out.append("\r\n");
}
}
catch(Exception ex3)
{
System.out.println (ex3.toString());
}
out.close();
}
}
可以这样public static void main(String[] args)
{
final WriteFile tf = new WriteFile();
Timer t = new Timer();
try
{
File myFile = new File("E:\\newFile.txt");
myFile.createNewFile();
PrintWriter out = new PrintWriter(new FileWriter("E:\\newFile.txt"));
t.schedule(new TimerTask(){
public void run()
{
tf.outPut(out);
}},0,300000);
out.close();
}
catch (Exception ex4)
{
System.out.println (ex4.toString());
}
} public void outPut(PrintWriter out)
{
try
{
for (int k = 1; k <=10; k++)
{
String serverName = "@labp2"+String.valueOf(k);
out.append(serverName);
out.append("\r\n");
}
}
catch(Exception ex3)
{
System.out.println (ex3.toString());
}
}
PrintWriter out = new PrintWriter(new FileWriter("E:\\newFile.txt",true));
import java.util.Date;
public class Filetest3 { public Filetest3() {
}
public static void main (String[] args)throws Exception {
File f=new File("D:\\a.txt");
f.createNewFile();
FileOutputStream out=new FileOutputStream("D:\\a.txt");
Date d=new Date();
long da=d.getTime();
String str= Long.toString(da);
byte[] buffer= str.getBytes();
while(2>1){
out.write(buffer);
Thread.sleep(5000);
}
out.close();
}
}