struts2验证码登陆实现

Posted 2022-12-13 Richard_i

首先是生成图片的Action:

package actions;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class CreateImageAction extends ActionSupport
	  private ByteArrayInputStream inputStream;

	    private static int WIDTH = 60;

	    private static int HEIGHT = 20;

	    public ByteArrayInputStream getInputStream()
	    
	        return inputStream;
	    

	    public void setInputStream(ByteArrayInputStream inputStream)
	    
	        this.inputStream = inputStream;
	    

	    private static String createRandom()
	    
	        String str = "0123456789qwertyuiopasdfghjklzxcvbnm";

	        char[] rands = new char[4];

	        Random random = new Random();

	        for (int i = 0; i < 4; i++)
	        
	            rands[i] = str.charAt(random.nextInt(36));
	        

	        return new String(rands);
	    

	    private void drawBackground(Graphics g)
	    
	        // 画背景
	        g.setColor(new Color(0xDCDCDC));

	        g.fillRect(0, 0, WIDTH, HEIGHT);

	        // 随机产生 120 个干扰点

	        for (int i = 0; i < 120; i++)
	        
	            int x = (int) (Math.random() * WIDTH);

	            int y = (int) (Math.random() * HEIGHT);

	            int red = (int) (Math.random() * 255);

	            int green = (int) (Math.random() * 255);

	            int blue = (int) (Math.random() * 255);

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

	            g.drawOval(x, y, 1, 0);
	        
	    

	    private void drawRands(Graphics g, String rands)
	    
	        g.setColor(Color.BLACK);

	        g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));

	        // 在不同的高度上输出验证码的每个字符

	        g.drawString("" + rands.charAt(0), 1, 17);

	        g.drawString("" + rands.charAt(1), 16, 15);

	        g.drawString("" + rands.charAt(2), 31, 18);

	        g.drawString("" + rands.charAt(3), 46, 16);

	        System.out.println(rands);

	    

	    public String execute() throws Exception
	    
	        HttpServletResponse response = ServletActionContext.getResponse();

	        // 设置浏览器不要缓存此图片
	        response.setHeader("Pragma", "no-cache");

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

	        response.setDateHeader("Expires", 0);

	        String rands = createRandom();

	        BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
	                BufferedImage.TYPE_INT_RGB);

	        Graphics g = image.getGraphics();

	        // 产生图像
	        drawBackground(g);

	        drawRands(g, rands);

	        // 结束图像 的绘制 过程， 完成图像
	        g.dispose();

	        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

	        ImageIO.write(image, "jpeg", outputStream);

	        ByteArrayInputStream input = new ByteArrayInputStream(outputStream
	                .toByteArray());

	        this.setInputStream(input);

	        HttpSession session = ServletActionContext.getRequest().getSession();

	        session.setAttribute("checkCode", rands);
	        
	        input.close();
	        
	        outputStream.close();

	        return SUCCESS;
	    
	

以上是生成随机验证码图片的action，将生成的随机数放到session里，然后页面提交到验证随机数的action:

package actions;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import beans.User;
import beans.UserDao;

public class Login_Action extends ActionSupport
    private User user;
    private String checkCode;
	public User getUser() 
		return user;
	

	public void setUser(User user) 
		this.user = user;
	
	
public String getCheckCode() 
		return checkCode;
	

	public void setCheckCode(String checkCode) 
		this.checkCode = checkCode;
	

		public String execute() throws Exception
    
        return SUCCESS;
     
	
	 @Override
	    public void validate()
	    
	        HttpSession session = ServletActionContext.getRequest().getSession();
	         
	        String checkCode2 = (String)session.getAttribute("checkCode");
	         
	        if(!checkCode.equals(checkCode2))
	        
	            addFieldError(checkCode, "输入的验证码不正确,请重新输入");
	        
	    

下面是struts.xml配置部分代码:

   <action name="login" class="actions.Login_Action">
   	 <result name="success">/login_Success.jsp</result>
      <result name="input">/login.jsp</result>
   </action>
   <action name="createImageAction" class="actions.CreateImageAction">
     <result name="success" type="stream">
           <param name="contentType">image/jpeg</param>
           <param name="inputName">inputStream</param>
     </result>
</action>

最后就是jsp部分的代码:

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">  
    function refresh()   
        //IE存在缓存,需要new Date()实现更换路径的作用  
        document.getElementById("image").src="createImageAction.action?+ Math.random()"+new Date();  
      
</script>  
<title>登陆页面</title>
</head>
<body>
<center>
<h3>用户登录</h3>
<s:fielderror cssStyle="color:red"></s:fielderror>
<s:form action="login.action" method="post" name="code">
<s:textfield name="user.userName" label="用户名"/>
<s:textfield name="user.userPwd" label="用户密码"/><br>
<s:textfield name="checkCode" maxlength="4" label="验证码"/>
  验证码：<img id="image" border="0"  οnclick="refresh()"  src="createImageAction.action" title="看不清，换一张">
<s:submit value="登陆"/> 
<s:reset value="重新输入"/>
<s:url ></s:url>
<a href="register.jsp">尚未注册，点击注册</a>
</s:form>
</center>
</body>
</html>

到此，就完成用struts2生成随机验证码图片以及实现登陆验证啦！