前端調(diào)用
<li> <lable>驗(yàn)證碼:</lable> <input type="text" name="yzm"> <img alt="" src="/getCode" onclick="refreshCode(this);"> <script type="text/javascript"> //刷新驗(yàn)證碼 function refreshCode(obj){ obj.src = "/getCode?time=" + new Date().getTime(); } </script> </li>
顯示效果
實(shí)現(xiàn)驗(yàn)證碼類
package tool; import java.awt.*; import java.awt.image.BufferedImage; import java.util.Random; public class ImageUtil { public static Object[] createImage() { Object[] obj = new Object[2]; int width = 100; // 驗(yàn)證碼圖片的高度。 int height = 30; // 驗(yàn)證碼字符個(gè)數(shù) int codeCount = 4; int x = 0; // 字體高度 int fontHeight; int codeY; x = width / (codeCount + 1); fontHeight = height - 2; codeY = height - 4; char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y','3', '4', '5', '6', '7', '8', '9','a','b','c','d','e','f','g','h', 'j','k','m','n','r','s','t','u','v','w','x','y'}; //定義圖像buffer BufferedImage buffImg = new BufferedImage( width, height,BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); //創(chuàng)建一個(gè)隨機(jī)數(shù)生成器類 Random random = new Random(); //將圖像填充為白色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); //創(chuàng)建字體,字體的大小應(yīng)該根據(jù)圖片的高度來定。 Font font = new Font("Fixedsys", Font.PLAIN, fontHeight-5); //設(shè)置字體。 g.setFont(font); //畫邊框 g.setColor(Color.WHITE); g.drawRect(0, 0, width - 2, height - 2); //隨機(jī)產(chǎn)生干擾線,使圖象中的認(rèn)證碼不易被其它程序探測到。 g.setColor(Color.BLACK); for(int i = 0; i < 5; i++) { int xx = random.nextInt(width); int yy = random.nextInt(height); int xxl = random.nextInt(12); int yyl = random.nextInt(12); g.drawLine(xx, yy, xx + xxl, yy + yyl); } //randomCode用于保存隨機(jī)產(chǎn)生的驗(yàn)證碼,以便用戶登錄后進(jìn)行驗(yàn)證。 StringBuffer randomCode = new StringBuffer(); int red = 0, green = 0, blue = 0; //隨機(jī)產(chǎn)生codeCount數(shù)字的驗(yàn)證碼。 for (int i = 0; i < codeCount; i++) { //得到隨機(jī)產(chǎn)生的驗(yàn)證碼數(shù)字。 String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); //產(chǎn)生隨機(jī)的顏色分量來構(gòu)造顏色值,這樣輸出的每位數(shù)字的顏色值都將不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); //用隨機(jī)產(chǎn)生的顏色將驗(yàn)證碼繪制到圖像中。 g.setColor(new Color(red, green, blue)); g.drawString(strRand, (i + 1) * x, codeY-2); //將產(chǎn)生的四個(gè)隨機(jī)數(shù)組合在一起。 randomCode.append(strRand); } obj[0] = randomCode.toString(); obj[1] = buffImg; return obj; } }
控制器調(diào)用:
package com.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import tool.ImageUtil; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.image.BufferedImage; import java.io.OutputStream; @Controller public class GetValiadateCode { //生成驗(yàn)證碼圖片 @ResponseBody @RequestMapping(value = "/getCode", method = RequestMethod.GET) public void validateCode(HttpServletRequest request, HttpServletResponse response) throws Exception{ //第一個(gè)參數(shù)是生成的驗(yàn)證碼,第二個(gè)參數(shù)是生成的圖片 Object[] objs = ImageUtil.createImage(); //將驗(yàn)證碼存入Session request.getSession(true).setAttribute("validateCode",objs[0]); //將圖片輸出給瀏覽器 BufferedImage image = (BufferedImage) objs[1]; // 禁止圖像緩存。 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); OutputStream os = response.getOutputStream(); ImageIO.write(image, "jpeg", os); os.flush(); } }