写在前面
前段时间大家都说最近大环境不好,好多公司在裁员,换工作的话不推荐轻易的裸辞,但是我想说的是我所在的公司好流弊,有做不完的业务需求,还有就是招不完的人......
最近我也是比较繁忙,但是还是要抽一点时间来进行自我复盘和记录,最近也写一个简单的小功能,就是登陆界面的图片验证码功能
环境:tomcat9、jdk1.8
1 生成验证码的工具类
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public class randomvalidatecodeutil {
public static final string randomcodekey= "randomvalidatecodekey" ; //放到session中的key
private string randstring = "0123456789" ; //随机产生只有数字的字符串 private string
//private string randstring = "abcdefghijklmnopqrstuvwxyz";//随机产生只有字母的字符串
//private string randstring = "0123456789abcdefghijklmnopqrstuvwxyz";//随机产生数字与字母组合的字符串
private int width = 95 ; // 图片宽
private int height = 25 ; // 图片高
private int linesize = 40 ; // 干扰线数量
private int stringnum = 4 ; // 随机产生字符数量
private static final logger logger = loggerfactory.getlogger(randomvalidatecodeutil. class );
private random random = new random();
/**
* 获得字体
*/
private font getfont() {
return new font( "fixedsys" , font.center_baseline, 18 );
}
/**
* 获得颜色
*/
private color getrandcolor( int fc, int bc) {
if (fc > 255 )
fc = 255 ;
if (bc > 255 )
bc = 255 ;
int r = fc + random.nextint(bc - fc - 16 );
int g = fc + random.nextint(bc - fc - 14 );
int b = fc + random.nextint(bc - fc - 18 );
return new color(r, g, b);
}
/**
* 生成随机图片
*/
public void getrandcode(httpservletrequest request, httpservletresponse response) {
httpsession session = request.getsession();
// bufferedimage类是具有缓冲区的image类,image类是用于描述图像信息的类
bufferedimage image = new bufferedimage(width, height, bufferedimage.type_int_bgr);
graphics g = image.getgraphics(); // 产生image对象的graphics对象,改对象可以在图像上进行各种绘制操作
g.fillrect( 0 , 0 , width, height); //图片大小
g.setfont( new font( "times new roman" , font.roman_baseline, 18 )); //字体大小
g.setcolor(getrandcolor( 110 , 133 )); //字体颜色
// 绘制干扰线
for ( int i = 0 ; i <= linesize; i++) {
drowline(g);
}
// 绘制随机字符
string randomstring = "" ;
for ( int i = 1 ; i <= stringnum; i++) {
randomstring = drowstring(g, randomstring, i);
}
logger.info(randomstring);
//将生成的随机字符串保存到session中
session.removeattribute(randomcodekey);
session.setattribute(randomcodekey, randomstring);
g.dispose();
try {
// 将内存中的图片通过流动形式输出到客户端
imageio.write(image, "jpeg" , response.getoutputstream());
} catch (exception e) {
logger.error( "将内存中的图片通过流动形式输出到客户端失败>>>> " , e);
}
}
/**
* 绘制字符串
*/
private string drowstring(graphics g, string randomstring, int i) {
g.setfont(getfont());
g.setcolor( new color(random.nextint( 101 ), random.nextint( 111 ), random
.nextint( 121 )));
string rand = string.valueof(getrandomstring(random.nextint(randstring
.length())));
randomstring += rand;
g.translate(random.nextint( 3 ), random.nextint( 3 ));
g.drawstring(rand, 13 * i, 16 );
return randomstring;
}
/**
* 绘制干扰线
*/
private void drowline(graphics g) {
int x = random.nextint(width);
int y = random.nextint(height);
int xl = random.nextint( 13 );
int yl = random.nextint( 15 );
g.drawline(x, y, x + xl, y + yl);
}
/**
* 获取随机的字符
*/
public string getrandomstring( int num) {
return string.valueof(randstring.charat(num));
}
}
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这个类不用动,可以直接拿来用
2 页面代码
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<!--html/bady代码-->
<div >
<div >
<div >
<input type= "tel" id= "verify_input" placeholder= "请输入验证码" maxlength= "4" >
</div>
</div>
<div >
<a href= "javascript:void(0);" rel= "external nofollow" title= "点击更换验证码" >
<img id= "imgverify" src= "login/getverify" alt= "更换验证码" height= "36" width= "170" onclick= "getverify(this);" >
</a>
</div>
<input type= "button" onclick= "averify()" value= "提交" >
</div>
</body>
<!--js中的代码-->
<script type= "text/javascript" src= "./js/jquery.min.js" ></script>
<script>
//获取验证码
/*function getverify(obj){
obj.src = "login/getverify?"+math.random();//原生js方式
}*/
//获取验证码
function getverify() {
// $("#imgcode").on("click", function() {
$( "#imgverify" ).attr( "src" , 'login/getverify?' + math.random()); //jquery方式
// });
}
function averify(){
var value =$( "#verify_input" ).val();
// alert(value);
$.ajax({
async: false ,
type: 'post' ,
url: 'login/checkverify' ,
datatype: "json" ,
data: {
verifyinput: value
},
success: function (result) {
if (result) {
alert( "success!" );
} else {
alert( "failed!" );
}
// window.location.reload();
getverify();
}
});
}
</script>
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注意:这里有2种获取验证码图片的方法
3 获取code和验证code的类
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@restcontroller
@requestmapping ( "/login" )
public class picverifyaction {
private final static logger logger = loggerfactory.getlogger(picverifyaction. class );
/**
* 生成验证码
*/
@requestmapping (value = "/getverify" )
public void getverify(httpservletrequest request, httpservletresponse response) {
try {
response.setcontenttype( "image/jpeg" ); //设置相应类型,告诉浏览器输出的内容为图片
response.setheader( "pragma" , "no-cache" ); //设置响应头信息,告诉浏览器不要缓存此内容
response.setheader( "cache-control" , "no-cache" );
response.setdateheader( "expire" , 0 );
randomvalidatecodeutil randomvalidatecode = new randomvalidatecodeutil();
randomvalidatecode.getrandcode(request, response); //输出验证码图片方法
} catch (exception e) {
logger.error( "获取验证码失败>>>> " , e);
}
}
/**
* 校验验证码
*/
@requestmapping (value = "/checkverify" , method = requestmethod.post,headers = "accept=application/json" )
public boolean checkverify( @requestparam string verifyinput, httpsession session) {
try {
//从session中获取随机数
string inputstr = verifyinput;
string random = (string) session.getattribute( "randomvalidatecodekey" );
if (random == null ) {
return false ;
}
if (random.equals(inputstr)) {
return true ;
} else {
return false ;
}
} catch (exception e){
logger.error( "验证码校验失败" , e);
return false ;
}
}
}
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4 效果图镇楼
5 源码
当然上面代码只是核心部分,如果有问题可去github自行下载 charmsongo
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。