diff --git a/src/main/java/dev/surl/surl/util/CheckSumUtil.kt b/src/main/java/dev/surl/surl/util/CheckSumUtil.kt
new file mode 100644
index 0000000..96ff05e
--- /dev/null
+++ b/src/main/java/dev/surl/surl/util/CheckSumUtil.kt
@@ -0,0 +1,8 @@
+package dev.surl.surl.util
+
+import org.springframework.util.DigestUtils
+
+fun md5(str: String): String {
+    val cksum = DigestUtils.md5Digest(str.toByteArray())
+    return cksum.joinToString("") { "%02x".format(it) }
+}
\ No newline at end of file
diff --git a/src/main/java/dev/surl/surl/util/UIDUtil.kt b/src/main/java/dev/surl/surl/util/UIDUtil.kt
new file mode 100644
index 0000000..b5b8e4c
--- /dev/null
+++ b/src/main/java/dev/surl/surl/util/UIDUtil.kt
@@ -0,0 +1,15 @@
+package dev.surl.surl.util
+
+import java.util.concurrent.ThreadLocalRandom
+
+private val CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray()
+private const val LENGTH = 16
+
+fun genSurlUID(): String {
+    return genSurlUID(LENGTH)
+}
+
+fun genSurlUID(length: Int): String {
+    val random = ThreadLocalRandom.current()
+    return CharArray(length) { CHARS[random.nextInt(CHARS.size)] }.concatToString()
+}
\ No newline at end of file
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 54f3721..639b0c8 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,7 +1,7 @@
 server:
-  port: 18888
+  port: 18888 #服务端口
 spring:
   application:
-    name: surl
+    name: surl # 应用名称
   main:
-    banner-mode: off
+    banner-mode: off # 关闭banner
diff --git a/src/test/java/dev/surl/surl/UtilTests.kt b/src/test/java/dev/surl/surl/UtilTests.kt
new file mode 100644
index 0000000..a40a09a
--- /dev/null
+++ b/src/test/java/dev/surl/surl/UtilTests.kt
@@ -0,0 +1,18 @@
+package dev.surl.surl
+
+import dev.surl.surl.util.genSurlUID
+import dev.surl.surl.util.md5
+import org.junit.jupiter.api.Test
+
+class UtilTests {
+    @Test
+    fun md5Test() {
+        assert(md5("sd") == "6226f7cbe59e99a90b5cef6f94f966fd")
+    }
+
+    @Test
+    fun randomUIDTest() {
+        println(genSurlUID())
+        println(genSurlUID(8))
+    }
+}
\ No newline at end of file