Question

java怎样判断一个文件中是否存在内容

Answer 1

package test1701;

import java.io.FileInputStream;
import java.io.IOException;

public class Test10 {
    public static void main(String[] args){
        String path  = "文件路径";
        FileInputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(path);
            if(fileInputStream.available() == 0){
                System.out.println("文件为空");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            if(fileInputStream != null){
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

Answer 2

import java.io.File;public class $ { public static void main(String[] args) { File f = new File("d:/a.txt"); System.out.println(f.exists()); }}false.不存在 true.存在