x

src/main/java/com/egolm/common/MathUtil.java

@@ -42,5 +42,9 @@ public class MathUtil {
 		return (T)k;
 	}
 	
+	public static int random(int min, int max) {
+        Random random = new Random();
+        return random.nextInt(max) % (max - min + 1) + min;
+    }
 
 }

src/main/java/com/egolm/common/StringUtil.java

@@ -17,6 +17,7 @@ import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
+import java.util.Random;
 import java.util.Map.Entry;
 import java.util.TreeMap;
 import java.util.UUID;
@@ -53,6 +54,18 @@ import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombi
  */
 public class StringUtil {
 	
+	private static final String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+	
+	public static String getRandomString(int length){
+	     Random random = new Random();
+	     StringBuffer sb=new StringBuffer();
+	     for(int i=0;i<length;i++){
+	       int number=random.nextInt(62);
+	       sb.append(str.charAt(number));
+	     }
+	     return sb.toString();
+	 }
+	
 	public static String join(Map<String, Object> map, String sign, String before, String after, String joinKey) {
 		sign = sign == null ? "" : sign;
 		before = before == null ? "" : before;