Java random string: Random numeric string, tool class

Tool class for generating random numbers, strings in Java

1. Call methods need to pass in the length of the generated string and the type required

　　Generate random numbers

Generate a random letter string

Generate random strings + numbers, etc.

.........

2. For a total of 8 types, see the comments in the tool class.

1 Importjava.util.Date;2 ImportJava.util.Random;3 ImportJava.util.UUID;4 5 /**6 * @Name Randomstringutil7 * @Descr generate random strings8  * @authorDX9 * @date October 15, 2015 PM 2:36:05Ten  */ One  Public classRandomstringutil { A     /** -      * @paramPasslength - *: How many lengths of string to generate the      * @paramtype - *: What kind of type is required -      * @returnAccording to the type passed in to determine -      */ +      -     //can be based on their own needs to cut down the following code, not the type can be deleted +       A     //type=0: Pure numerals (0-9) at     //type=1: Full lowercase letter (A-Z) -     //type=2: All caps (A-Z) -     //type=3: Numbers + lowercase letters -     //type=4: Numbers + uppercase letters -     //type=5: Uppercase + lowercase letters -     //type=6: Numbers + uppercase letters + lowercase letters in     //type=7: fixed-length 33-bit: Four "-" (equivalent to 33-bit lowercase letters plus numbers) removed from the random string obtained by the UUID -  to      Public StaticString Getrandomcode (intPasslength,inttype) { +StringBuffer buffer =NULL; -StringBuffer SB =NewStringBuffer (); theRandom r =NewRandom (); *R.setseed (NewDate (). GetTime ()); $         Switch(type) {Panax Notoginseng          Case0: -Buffer =NewStringBuffer ("0123456789"); the              Break; +          Case1: ABuffer =NewStringBuffer ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"); the              Break; +          Case2: -Buffer =NewStringBuffer ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"); $              Break; $          Case3: -Buffer =NewStringBuffer ("0123456789abcdefghijklmnopqrstuvwxyz"); -              Break; the          Case4: -Buffer =NewStringBuffer ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");Wuyi              Break; the          Case5: -Buffer =NewStringBuffer ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"); Wu              Break; -          Case6: AboutBuffer =NewStringBuffer ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); $Sb.append (Buffer.charat (R.nextint (buffer.length)-10))); -Passlength-= 1; -              Break; -          Case7: AString s =Uuid.randomuuid (). toString (); +Sb.append (s.substring (0, 8) + s.substring (9) + s.substring (+) + s.substring (+ +) + s.substring (24)); the         } -  $         if(Type! = 7) { the             intRange =buffer.length (); the              for(inti = 0; i < passlength; ++i) { the sb.append (Buffer.charat (R.nextint (range))); the             } -         } in         returnsb.tostring (); the     } the}

Java random string: Random numeric string, tool class