本文共 1608 字，大约阅读时间需要 5 分钟。

1.  新建一个controller

@Controller@RequestMapping("/index")public class LoginController {
   	@RequestMapping("/logins")	public void login(HttpServletRequest request, HttpServletResponse response) throws IOException {
   		int width=100;		int height=50;		//创建一个对象，在内存中图片（验证码图片对象）		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);		//美化图片		//填充背景色		Graphics graphics = image.getGraphics();		graphics.setColor(Color.green);		Font font = new Font("黑体",Font.PLAIN,20);		graphics.setFont(font);		graphics.fillRect(0,0,width,height);		//画边框		graphics.setColor(Color.black);		graphics.drawRect(0,0,width-1,height-1);		String str="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";		Random random = new Random();		for (int i = 0; i < 4; i++) {
   			int index = random.nextInt(str.length());			//随机字符			char charAt = str.charAt(index);			//写验证码			graphics.drawString(charAt+"",width/5*i,height/2);		}		//画干扰线		graphics.setColor(Color.GREEN);		//随机生成坐标点		for (int i = 0; i < 10; i++) {
   			int x1=random.nextInt(width);			int x2= random.nextInt(width);			int y1=random.nextInt(height);			int y2=random.nextInt(height);			graphics.drawLine(x1,y1,x2,y2);			//将图片输出到页面上			ImageIO.write(image,"jpg",response.getOutputStream());		}	}}

2.在resources/static目录下新建一个html文件

  
       
   
  
    
         
      
             
用户名
             
          
          
             
密码
             
          
          
             
验证码
             
          
          
             
          
          
             
          
       
    
   

3.此项目的端口为8084，所以访问地址http://localhost:8084/login.html

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