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Java生成随机长度密码。
代码如下/**
* 生成随机密码
*
* @param pwd_len
* 生成的密码的总长度
* @return 密码的字符串
*/
public static String genRandomNum(int pwd_len) {
// 35是因为数组是从0开始的,26个字母+10个数字
final int maxNum = 36;
int i; // 生成的随机数
int count = 0; // 生成的密码的长度
char[] str = { ‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’, ‘h’, ‘i’, ‘j’, ‘k’,
‘l’, ‘m’, ‘n’, ‘o’, ‘p’, ‘q’, ‘r’, ‘s’, ‘t’, ‘u’, ‘v’, ‘w’,
‘x’, ‘y’, ‘z’, ’0′, ’1′, ’2′, ’3′, ’4′, ’5′, ’6′, ’7′, ’8′, ’9′ };
StringBuffer pwd = new StringBuffer(“”);
Random r = new Random();
while (count < pwd_len) {
// 生成随机数,取绝对值,防止生成负数,
i = Math.abs(r.nextInt(maxNum)); // 生成的数最大为36-1
if (i >= 0 && i < str.length) {
pwd.append(str[i]);
count++;
}
}
return pwd.toString();
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(genRandomNum(14));//生成14位随机密码
}
生成指定长度的随机密码
import java.util.Random;
public class test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(genRandomNum(10));
}
/**
* 生成随即密码
* @param pwd_len 生成的密码的总长度
* @return 密码的字符串
*/
public static String genRandomNum(int pwd_len){
//35是因为数组是从0开始的,26个字母+10个数字
final int maxNum = 36;
int i; //生成的随机数
int count = 0; //生成的密码的长度
char[] str = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
"x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
StringBuffer pwd = new StringBuffer("");
Random r = new Random();
while(count < pwd_len){
//生成随机数,取绝对值,防止生成负数,
i = Math.abs(r.nextInt(maxNum)); //生成的数最大为36-1
if (i >= 0 && i < str.length) {
pwd.append(str[i]);
count ++;
}
}
return pwd.toString();
}
}
java 生成15位的随机码
代码如下import java.util.ArrayList;
import java.util.List;
public class GeneratePswd {
@SuppressWarnings({ "unchecked", "unchecked" })
public static void main(String[] args) {
StringBuffer buf = new StringBuffer("a,b,c,d,e,f,g,h,i,g,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z");
buf.append(",A,B,C,D,E,F,G,H,I,G,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z");
buf.append(",~,@,#,$,%,^,&,*,(,),_,+,|,`,.");
buf.append(",1,2,3,4,5,6,7,8,9,0");
String[] arr = buf.toString().split(",");
List pswdList = new ArrayList();
for(int i=0;i<50;i++){
pswdList.add(getPswd(arr));
}
for(int i=0;i
}
}
public static String getPswd(String[] arr){
StringBuffer b = new StringBuffer();
java.util.Random r;
int k ;
for(int i=0;i<15;i++){
r = new java.util.Random();
k = r.nextInt();
b.append(String.valueOf(arr[Math.abs(k % 76)]));
}
return b.toString();
}
}