一、创建image工具类

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.Random;

public class ImageUtil {

// 图片的宽度。

private int width = 160;

// 图片的高度。

private int height = 40;

// 验证码字符个数

private int codeCount = 5;

// 验证码干扰线数

private int lineCount = 150;

// 验证码

private String code = null;

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‘};

private BufferedImage bufferedImage;

private ImageUtil(int width, int height){

this.width = width;

this.height = height;

}

public ImageUtil(int width, int height, int codeCount, int lineCount){

this(width, height);

this.codeCount = codeCount;

this.lineCount = lineCount;

createCodeImage();

}

private void createCodeImage(){

//字符所在x坐标

int x = 0;

//字体高度

int fontHeight = 0;

//字符所在y坐标

int codeY = 0;

int red = 0;

int green = 0;

int blue = 0;

x = width / (codeCount + 2);

fontHeight = height - 2;

codeY = height - 4;

bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);

Graphics2D graphics2D = bufferedImage.createGraphics();

Random random = new Random();

graphics2D.setColor(Color.WHITE);

graphics2D.fillRect(0, 0, width,height);

Font font = new Font("Fixedays",Font.PLAIN,fontHeight);

graphics2D.setFont(font);

for (int i = 0; i < lineCount; i++) {

//x轴第一个点的位置

int x1 = random.nextInt(width);

//y轴第一个点的位置

int y1 = random.nextInt(height);

//x轴第二个点的位置

int x2 = x1 + random.nextInt(width >> 2);

//y轴第二个点的位置

int y2 = y1 + random.nextInt(height >> 2);

red = random.nextInt(255);

green = random.nextInt(255);

blue = random.nextInt(255);

graphics2D.setColor(new Color(red, green, blue));

graphics2D.drawLine(x1, y1, x2, y2);

}

StringBuffer randomCode = new StringBuffer(codeCount);

for (int i = 0; i < codeCount; i++) {

String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);

red = random.nextInt(255);

green = random.nextInt(255);

blue = random.nextInt(255);

graphics2D.setColor(new Color(red, green, blue));

graphics2D.drawString(strRand, (i +1) * x, codeY);

randomCode.append(strRand);

}

code = randomCode.toString();

}

public void write(String path) throws IOException {

OutputStream outputStream = new FileOutputStream(path);

this.write(outputStream);

outputStream.flush();

outputStream.close();

}

public void write(OutputStream outputStream) throws IOException {

ImageIO.write(bufferedImage, "png", outputStream);

}

public BufferedImage getBufferedImage(){

return bufferedImage;

}

public String getCode(){

return code;

}

}

二、controller

@GetMapping(value = "/code")

public String getCode(HttpServletRequest request, HttpServletResponse response) throws Exception{

response.setContentType("image/jpeg");

//禁止图像缓存

response.setHeader("Pragma","no-cache");

response.setHeader("Cache-Control", "no-cache");

response.setDateHeader("Expires", 0);

HttpSession session = request.getSession();

ImageUtil imageUtil = new ImageUtil(120, 40, 5,30);

session.setAttribute("code", imageUtil.getCode());

imageUtil.write(response.getOutputStream());

return null;

}

三、前台调用

$("#vimg").on("click",function () { var timestamp = (new Date()).valueOf(); $(this).attr("src","code?timestamp=" + timestamp); });