用java生成6位验证码，要求字母大小写数字组成，不能重复字符 用java生成6为验证码，要求大小写，数字，不能重复字符
\u7528java\u751f\u62106\u4f4d\u9a8c\u8bc1\u7801\uff0c\u7531\u5927\u5c0f\u5199\u6570\u5b57\u7ec4\u6210\uff0c\u4e0d\u80fd\u91cd\u590d\u5b57\u7b26\u751f\u6210\u968f\u673a\u53ef\u4ee5\u7528Random\u7c7b\uff0c\u4e0d\u80fd\u91cd\u590d\u53ef\u4ee5\u8003\u8651\u653e\u5728HashSet\u4e2d\uff0c\u56e0\u4e3aHashSet\u7684\u503c\u662f\u4e0d\u80fd\u91cd\u590d\u7684\uff0c\u770b\u4ee3\u7801\u5982\u4e0b\uff1a
public class GenerateRandomLetterAndNum {public static void main(String[] args) { Set store = getletterandnum(6); printSet(store);}public static Set getletterandnum(int length) {Set set =new HashSet();for (int i = 0; i < length; i++) {String value = getrandom();set.add(value);}if (set.size()<length) { //\u5982\u679c\u6ca1\u6709\u751f\u62106\u4f4dString value = getrandom();//\u7ee7\u7eed\u8c03\u7528\u751f\u6210\u968f\u673a\u6570\u7684\u65b9\u6cd5set.add(value);}return set;}private static String getrandom() { //\u751f\u6210\u968f\u673a\u5b57\u6bcd\u548c\u6570\u5b57\u65b9\u6cd5String value = "";Random random = new Random();int gen = random.nextInt(2);//0\u30011\u30012String charornum = gen % 2 == 0 ? "char" : "num";if ("char".equals(charornum)) {int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;int ascii = random.nextInt(26);value += (char) (ascii + temp);} else if ("num".equalsIgnoreCase(charornum)) {value += String.valueOf(random.nextInt(10));}return value;}public static void printSet(Set set){ //\u6253\u5370set\u7684\u65b9\u6cd5 Iterator iterator = set.iterator(); while (iterator.hasNext()) {String ele = (String) iterator.next();System.out.print(ele+" "); }}
public class test{
private static String [] 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","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"};
private static String DarwCode(){
String strRandom="";
char temp;
int [] num = new int[6];
int numA=0,numB=0,numC=0,ramNum=(int)(Math.random()*62);
//\u53bb\u6389\u91cd\u590d\u7684\u5173\u952e\u4ee3\u7801
num[0]=ramNum;
for (int i = 1; i < num.length; i++) {
num[i] = (int)(Math.random()*62);
for (int j = 0; j < i; j++) {
while ((num[i]==num[j])&&(i>=1)) {
i--;
}
}
}
//\u8f93\u51fa\u5b57\u7b26\u4e32
for (int i = 0; i < num.length; i++) {
strRandom+=str[num[i]];
}
for (int i = 0; i <strRandom.length(); i++) {
temp=strRandom.substring(i,i+1).charAt(0);
if ((int)temp>=48&&(int)temp<=57) {
numA++;
}else if ((int)temp>=65&&(int)temp<=90) {
numB++;
}else if((int)temp>=97&&(int)temp<=122){
numC++;
}
}
if ((numA+numB==6)||(numA+numC==6)||(numB+numC==6)) {
strRandom = DarwCode();
}
return strRandom;
}
public static void main(String[] args) {
System.out.println(DarwCode());
}
}
public static void main(String[] args) {
Set<String> store = getletterandnum(6);
printSet(store);
}
public static Set<String> getletterandnum(int length) {
Set<String> set =new HashSet<String>();
for (int i = 0; i < length; i++) {
String value = getrandom();
set.add(value);
}
if (set.size()<length) { //如果没有生成6位
String value = getrandom();//继续调用生成随机数的方法
set.add(value);
}
return set;
}
private static String getrandom() { //生成随机字母和数字方法
String value = "";
Random random = new Random();
int gen = random.nextInt(2);//0、1、2
String charornum = gen % 2 == 0 ? "char" : "num";
if ("char".equals(charornum)) {
int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
int ascii = random.nextInt(26);
value += (char) (ascii + temp);
} else if ("num".equalsIgnoreCase(charornum)) {
value += String.valueOf(random.nextInt(10));
}
return value;
}
public static void printSet(Set set){ //打印set的方法
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
String ele = (String) iterator.next();
System.out.print(ele+" ");
}
}
表达式转换类
${expression}计算expression并输出
#{ expression }数字计算#{ expression ;format}安格式输出数字format为M和m
M表示小数点后最多的位数,m表示小数点后最少的位数如#{121.2322;m2M2}输出121.23 ！
有些长，给你个可以直接使用的验证码，你可以改下长度，
http://www.cnblogs.com/wufengxyz/archive/2011/12/04/2275489.html
用random生成随机数
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