常用的获取随机字符串

骑猪看日落 2022-08-06 13:26 127阅读 0赞

package com.tianren.util;  
import java.util.Random;    
   
/\*\*   
 \* RandomString.java   
 \* utils class   
 \* @author jinxx  
 \* @version 1.0  2009-6-10  
 \* \*/   
public class RandomString \{    
        
    /\*\*返回大写随机字母字符串\*/   
    public static String getRandomStringU(int length)\{    
        String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(26);    
            sb.append(str.charAt(number));    
        \}           
        return sb.toString();    
    \}    
        
    /\*\*返回小写随机字母字符串\*/   
    public static String getRandomStringL(int length)\{    
        String str = "abcdefghijklmnopqrstuvwxyz";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(26);    
            sb.append(str.charAt(number));    
        \}           
        return sb.toString();    
    \}    
        
    /\*\*返回随机数字字符串\[0-9\]\*/   
    public static String getRandomStringN10(int length)\{    
        String str = "0123456789";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(10);    
            sb.append(str.charAt(number));    
        \}           
        return sb.toString();  
    \}    
        
    /\*\*返回随机数字字符串\[1-9\]\*/   
    public static String getRandomStringN9(int length)\{    
        String str = "123456789";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(9);    
            sb.append(str.charAt(number));    
        \}           
        return sb.toString();    
    \}    
        
    /\*\*返回随机数字\[1-9\]\*/   
    public static int getRandomIntN9(int length)\{    
        String str = "123456789";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(9);    
            sb.append(str.charAt(number));    
        \}           
        return Integer.parseInt(sb.toString());    
    \}    
        
    /\*\*返回随机数字\[0-9\]\*/   
    public static int getRandomIntN10(int length)\{    
        String str = "0123456789";    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();    
        for(int i=0;i<length;++i)\{    
            int number = random.nextInt(10);    
            sb.append(str.charAt(number));    
        \}           
        return Integer.parseInt(sb.toString());    
    \}       
        
    /\*\*返回大小写字母及数字混合的字符串\*/   
    public static String getRandomStringA(int length)\{    
        Random random = new Random();    
        StringBuffer sb = new StringBuffer();           
        for(int i = 0; i < length; ++i)\{    
            int number = random.nextInt(3);    
            long result = 0;    
            switch(number)\{    
            case 0:    
                result = Math.round(Math.random() \* 25 + 64);    
                sb.append(String.valueOf((char)result));    
                break;    
            case 1:    
                result = Math.round(Math.random() \* 25 + 97);    
                sb.append(String.valueOf((char)result));    
                break;    
            case 2:    
                sb.append(String.valueOf(new Random().nextInt(10)));    
                break;                  
            \}    
        \}       
        return sb.toString();    
    \}    
        
\}