Changes between Initial Version and Version 1 of NCHCCloudCourse100928_3_EXE3_sol

Timestamp:

Jul 21, 2011, 11:32:47 AM (13 years ago)

Author:

waue

Comment:

--

NCHCCloudCourse100928_3_EXE3_sol

@@ +1 @@
+{{{
+#!java
+package org.nchc.hadoop;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+
+
+public class CheckAndDelete {
+        // checkAndDelete函式，檢查是否存在該資料夾，若有則刪除之
+        static boolean checkAndDelete(final String path, Configuration conf) {
+                Path dst_path = new Path(path);
+                try {
+                        // 產生操作hdfs的物件
+                        FileSystem hdfs = dst_path.getFileSystem(conf);
+                        // 檢查是否存在
+                        if (hdfs.exists(dst_path)) {
+                                // 有則刪除
+                                hdfs.delete(dst_path, true);
+                                return true;
+                        }else{
+                                return false;
+                        }
+
+                } catch (IOException e) {
+                        e.printStackTrace();
+                        return false;
+                        
+                }
+                
+        }
+        static public void main(String args[]){
+                Configuration conf = new Configuration();
+                String path = "/user/hadoop/program_put_input";
+
+                boolean status = checkAndDelete( path, conf);
+                System.err.println("delete? :" + status);
+                
+        }
+}
+
+}}}