diff --git a/src/test/java/TestString.java b/src/test/java/TestString.java
new file mode 100644
index 0000000000000000000000000000000000000000..6517a6fa291059b0b121cf510509171fb3be98a3
--- /dev/null
+++ b/src/test/java/TestString.java
@@ -0,0 +1,40 @@
+import cn.hutool.core.lang.PatternPool;
+import cn.hutool.core.util.ReUtil;
+
+import java.nio.charset.Charset;
+import java.util.Collection;
+import java.util.SortedMap;
+import java.util.regex.Pattern;
+
+/**
+ * Created by jiangzeyin on 2019/3/1.
+ */
+public class TestString {
+    public static void main(String[] args) {
+
+        Pattern pattern = Pattern.compile("(https://|http://)?([\\w-]+\\.)+[\\w-]+(:\\d+|/)+([\\w- ./?%&=]*)?");
+        String url = "http://192.168.1.111:2122/node/index.html?nodeId=dyc";
+        System.out.println(ReUtil.isMatch(pattern, url));
+        System.out.println(ReUtil.isMatch(PatternPool.URL_HTTP, url));
+
+        System.out.println(Math.pow(1024, 2));
+
+        System.out.println(Integer.MAX_VALUE);
+
+        while (true) {
+            SortedMap<String, Charset> x = Charset.availableCharsets();
+            Collection<Charset> values = x.values();
+            boolean find = false;
+            for (Charset charset : values) {
+                String name = charset.name();
+                if ("utf-8".equalsIgnoreCase(name)) {
+                    find = true;
+                    break;
+                }
+            }
+            if (!find) {
+                System.out.println("没有找utf-8");
+            }
+        }
+    }
+}