Created
January 6, 2019 08:20
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Java 随机字符串
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import java.security.SecureRandom; | |
import java.util.Locale; | |
import java.util.Objects; | |
import java.util.Random; | |
public class RandomString { | |
/** | |
* Generate a random string. | |
*/ | |
public String nextString() { | |
for (int idx = 0; idx < buf.length; ++idx) | |
buf[idx] = symbols[random.nextInt(symbols.length)]; | |
return new String(buf); | |
} | |
public static final String upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
public static final String lower = upper.toLowerCase(Locale.ROOT); | |
public static final String digits = "0123456789"; | |
public static final String alphanum = upper + lower + digits; | |
private final Random random; | |
private final char[] symbols; | |
private final char[] buf; | |
public RandomString(int length, Random random, String symbols) { | |
if (length < 1) throw new IllegalArgumentException(); | |
if (symbols.length() < 2) throw new IllegalArgumentException(); | |
this.random = Objects.requireNonNull(random); | |
this.symbols = symbols.toCharArray(); | |
this.buf = new char[length]; | |
} | |
/** | |
* Create an alphanumeric string generator. | |
*/ | |
public RandomString(int length, Random random) { | |
this(length, random, alphanum); | |
} | |
/** | |
* Create an alphanumeric strings from a secure generator. | |
*/ | |
public RandomString(int length) { | |
this(length, new SecureRandom()); | |
} | |
/** | |
* Create session identifiers. | |
*/ | |
public RandomString() { | |
this(21); | |
} | |
} |
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@Test | |
public void test2() { | |
RandomNumberGenerator rng = new SecureRandomNumberGenerator(); | |
Object salt = rng.nextBytes(); | |
System.out.println(salt.toString()); | |
} |
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