5.判断文件或目录是否存在

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class isFIleExist {
        public static void main(String[] args) {
                    try {
                            String filename = "test";
                            //经典配置四件套
                            Configuration conf = new Configuration();
                            conf.set("fs.defaultFS","hdfs://localhost:9000");
                            conf.set("fs.hdfs.impl","org.apache.hadoop.hdfs.DistributedFileSystem");
                            FileSystem fs = FileSystem.get(conf);
                            if(fs.exists(new Path(filename))){
                                    System.out.println("文件或目录存在");
                            }else{
                                    System.out.println("文件或目录不存在");
                            }
                            fs.close();
                } catch (Exception e) {
                        e.printStackTrace();
                }
        }
}