Java实现密码生成器，生成密码明文和加密后的密码

import sun.misc.BASE64Encoder;

import java.util.Random;
import java.security.MessageDigest;

public class PasswordCreator {

public static class GeneratedPassword {
private String clearText;
private String encrypted;

private GeneratedPassword(String clearText, String encrypted) {
this.clearText = clearText;
this.encrypted = encrypted;
}

public String getClearText() {
return clearText;
}

public String getEncrypted() {
return encrypted;
}
}
//the below number 13,58,74 you can change any number for you company.
public static GeneratedPassword generate(int length) {
Random rnd = new Random(System.currentTimeMillis());
int letterLength = length - 1;
byte[] buf = new byte[letterLength];
for (int i = 0; i < letterLength; ++i) {
int idx = Math.abs(rnd.nextInt()) % 13;
int offset = idx % 2 == 1 ? 58 : 74;
int ch = offset + idx;
buf[i] = (byte) ch;
}
String clearText = insertRandomNumber(buf);
String encrypted = encryptUnsaltedSha1(clearText);

return new GeneratedPassword(clearText, encrypted);
}
//the below number 9, you can change any number for you company.
private static String insertRandomNumber(byte[] buf) {
StringBuffer sb = new StringBuffer(new String(buf));
Random rnd = new Random(System.currentTimeMillis());
int number = Math.abs(rnd.nextInt()) % 9;
int offset = Math.abs(rnd.nextInt()) % (sb.length());
sb.insert(offset, number);
return sb.toString();
}

private static String encryptUnsaltedSha1(String password) {
try {
String alg = "SHA-1";
MessageDigest digest = MessageDigest.getInstance(alg);
digest.update(password.getBytes("UTF-8"));
return new BASE64Encoder().encode(digest.digest());
} catch (Exception e) {
throw new RuntimeException(e);
}
}

//Other service can invoke this util like below:
public static void main(String[] args) {
GeneratedPassword password=generate(6);
System.out.println(password.getClearText());
System.out.println(password.getEncrypted());
}
/*the output like below:
JNRR6A
Yvp+P0KeFaBjamzJ3wW8yDUafko=*/
}