原标题：Java 生成随机数的 5 种方式，你知道几种？

1. Math.random 静态方法

产生的随机数是 0 - 1 之间的一个 double ，即 0 commons-lang

< artifactId> commons-lang

< version> 2.6

API 参考：https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/RandomStringUtils.html

示例：

publicclassRandomStringDemo{

publicstaticvoidmain( String[] args) {

// Creates a 64 chars length random string of number.

String result = RandomStringUtils.random( 64, false, true);

System. out.println( "random = "+ result);

// Creates a 64 chars length of random alphabetic string.

result = RandomStringUtils.randomAlphabetic( 64);

System. out.println( "random = "+ result);

// Creates a 32 chars length of random ascii string.

result = RandomStringUtils.randomAscii( 32);

System. out.println( "random = "+ result);

// Creates a 32 chars length of string from the defined array of

// characters including numeric and alphabetic characters.

result = RandomStringUtils.random( 32, 0, 20, true, true, "qw32rfHIJk9iQ8Ud7h0X".toCharArray);

System. out.println( "random = "+ result);

}

}

RandomStringUtils 类的实现上也是依赖了 java.util.Random 工具类：

RandomStringUtils 类的定义

参考：

http://yangzb.iteye.com/blog/325264

http://stackoverflow.com/questions/11051205/difference-between-java-util-random-and-java-security-securerandom

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