建立工具類:
package com.lyt.util;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;
/**
* 驗證碼生成器
*
* @author
*/
public class ValidateCode {
// 圖檔的寬度。
private int width = 160;
// 圖檔的高度。
private int height = 40;
// 驗證碼字元個數
private int codeCount = 5;
// 驗證碼幹擾線數
private int lineCount = 150;
// 驗證碼
private String code = null;
// 驗證碼圖檔Buffer
private BufferedImage buffImg = null;
// 驗證碼範圍,去掉0(數字)和O(拼音)容易混淆的(小寫的1和L也可以去掉,大寫不用了)
private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
/**
* 預設構造函數,設定預設參數
*/
public ValidateCode() {
this.createCode();
}
/**
* @param width 圖檔寬
* @param height 圖檔高
*/
public ValidateCode(int width, int height) {
this.width = width;
this.height = height;
this.createCode();
}
/**
* @param width 圖檔寬
* @param height 圖檔高
* @param codeCount 字元個數
* @param lineCount 幹擾線條數
*/
public ValidateCode(int width, int height, int codeCount, int lineCount) {
this.width = width;
this.height = height;
this.codeCount = codeCount;
this.lineCount = lineCount;
this.createCode();
}
public void createCode() {
int x = 0, fontHeight = 0, codeY = 0;
int red = 0, green = 0, blue = 0;
x = width / (codeCount + 2);//每個字元的寬度(左右各空出一個字元)
fontHeight = height - 2;//字型的高度
codeY = height - 4;
// 圖像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
// 生成随機數
Random random = new Random();
// 将圖像填充為白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 建立字型,可以修改為其它的
Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
// Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);
g.setFont(font);
for (int i = 0; i < lineCount; i++) {
// 設定随機開始和結束坐标
int xs = random.nextInt(width);//x坐标開始
int ys = random.nextInt(height);//y坐标開始
int xe = xs + random.nextInt(width / 8);//x坐标結束
int ye = ys + random.nextInt(height / 8);//y坐标結束
// 産生随機的顔色值,讓輸出的每個幹擾線的顔色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
g.setColor(new Color(red, green, blue));
g.drawLine(xs, ys, xe, ye);
}
// randomCode記錄随機産生的驗證碼
StringBuffer randomCode = new StringBuffer();
// 随機産生codeCount個字元的驗證碼。
for (int i = 0; i < codeCount; i++) {
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
// 産生随機的顔色值,讓輸出的每個字元的顔色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
g.setColor(new Color(red, green, blue));
g.drawString(strRand, (i + 1) * x, codeY);
// 将産生的四個随機數組合在一起。
randomCode.append(strRand);
}
// 将四位數字的驗證碼儲存到Session中。
code = randomCode.toString();
}
public void write(String path) throws IOException {
OutputStream sos = new FileOutputStream(path);
this.write(sos);
}
public void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code;
}
/**
* 測試函數,預設生成到d盤
* @param args
*/
public static void main(String[] args) {
ValidateCode vCode = new ValidateCode(160,40,5,150);
try {
String path="D:/"+new Date().getTime()+".png";
System.out.println(vCode.getCode()+" >"+path);
vCode.write(path);
} catch (IOException e) {
e.printStackTrace();
}
}
}
通過controller 層進行調用:
package com.lyt.conntroller;
import com.lyt.util.ValidateCode;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@RestController
@RequestMapping("/setPric")
@CrossOrigin
public class ValidateCodes {
/**
* 響應驗證碼頁面
* @return
*/
@RequestMapping(value="/validateCode")
public String validateCode(HttpServletRequest request, HttpServletResponse response) throws Exception{
// 設定響應的類型格式為圖檔格式
response.setContentType("image/jpeg");
//禁止圖像緩存。
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
HttpSession session = request.getSession();
ValidateCode vCode = new ValidateCode(120,40,5,100);
session.setAttribute("code", vCode.getCode());
vCode.write(response.getOutputStream());
System.out.println(vCode.getCode());
return null;
}
}
建立jsp 進行測試:
<%--
Created by IntelliJ IDEA.
User: 01391056
Date: 2018/9/26
Time: 14:28
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div class="form-group col-lg-6">
<label for="id" class="col-sm-4 control-label">
驗證碼:
</label>
<div class="col-sm-8">
<input type="text" id="code" name="code" class="form-control" style="width:250px;"/>
<img id="imgObj" alt="驗證碼" src="/article/validateCode" onclick="changeImg()"/>
<a href="#" target="_blank" rel="external nofollow" onclick="changeImg()">換一張</a>
</div>
</div>
<script type="text/javascript">
// 重新整理圖檔
function changeImg() {
var imgSrc = $("#imgObj");
var src = imgSrc.attr("src");
imgSrc.attr("src", changeUrl(src));
}
//為了使每次生成圖檔不一緻,即不讓浏覽器讀緩存,是以需要加上時間戳
function changeUrl(url) {
var timestamp = (new Date()).valueOf();
var index = url.indexOf("?",url);
if (index > 0) {
url = url.substring(index, url.indexOf(url, "?"));
}
if ((url.indexOf("&") >= 0)) {
url = url + "×tamp=" + timestamp;
} else {
url = url + "?timestamp=" + timestamp;
}
return url;
}
</script>
</body>
</html>