try
{
String filePath = "D:\\tomcat\\webapps\\myweb\\new.txt";
File new_file = new File(filePath);
PrintWriter pnWriter = null;
if(new_file.exists()){//添加到文件尾
new PrintWriter(new FileOutputStream(new_file,true));
}else{//新建文件内容
new PrintWriter(new FileOutputStream(new_file,true));
}
}
catch(FileNotFoundException ex)
{
System.out.println(ex.getMessage());
}
{
String filePath = "D:\\tomcat\\webapps\\myweb\\new.txt";
File new_file = new File(filePath);
PrintWriter pnWriter = null;
if(new_file.exists()){//添加到文件尾
new PrintWriter(new FileOutputStream(new_file,true));
}else{//新建文件内容
new PrintWriter(new FileOutputStream(new_file,true));
}
}
catch(FileNotFoundException ex)
{
System.out.println(ex.getMessage());
}
import java.io.*;
public class NewFile
{
public static void main(String[] args)
{
try
{
boolean flag = true;//ÓÃÓÚÅжÏÊÇ·ñ´æÔÚ¸ÃÎļþ String filePath = "D:\\tomcat\\webapps\\myweb";
File new_file = new File(filePath);
if (!fileDir.exists()) {//½¨Á¢D:\tomcat\webapps\mywebĿ¼
fileDir.mkdirs();
}
String[] fileNames = fileDir.list();
for (int i = 0; i < fileNames.length; i++) {
if (fileNames[i].equals("new.txt")) {
flag = false;
break;
}
}
if (flag) {
PrintWriter pnWriter = new PrintWriter(new FileOutputStream("D:\\tomcat\\webapps\\myweb\\new.txt"));
}
}
catch(FileNotFoundException ex)
{
System.out.println(ex.getMessage());
}
}
}