add udf

src/main/java/com/winhc/bigdata/udf/StringToMillis.java

@@ -0,0 +1,39 @@
+package com.winhc.bigdata.udf;
+
+import com.aliyun.odps.udf.UDF;
+import com.aliyun.odps.utils.StringUtils;
+
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Pattern;
+
+/**
+ * @Author: π
+ * @Date: 2022/6/14 11:13
+ * @Description:
+ */
+public class StringToMillis extends UDF {
+
+    public String evaluate(String date) {
+        if (StringUtils.isEmpty(date)) {
+            return null;
+        }
+        String p = "yyyy-MM-dd HH:mm:ss";
+        if (date.length() == 10) {
+            p = "yyyy-MM-dd";
+        }
+        SimpleDateFormat fm = new SimpleDateFormat(p);
+        try {
+            return String.valueOf(fm.parse(date).getTime());
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public static void main(String[] args) {
+        String s = "2022-06-14 00:00:00";
+        StringToMillis r = new StringToMillis();
+        System.out.println(r.evaluate(s));
+    }
+}