struts2中的Ajax异步校验
Posted bluedarkni
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登录时验证码的异步校验:
1.验证码生成的是图片因此在struts.xml文件里面配置action 时,result标签中type 属性是stream
2.验证码图片的src的值为配置action名字:
3.登录处理的action里面需要有一个对应的JSONObject 类型的成员变量
4.struts.xml里面配置异步请求的action,pakage需要继承json-default;result标签中type 属性是josn;
param标签的name属性为root,还有个后处理器,对结果进行处理,
如果自己定义name的话,需要注意返回的josn\'格式再获取值:
验证码action:
package ni.jun.yang.action; 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.HttpServletRequest; 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 static final long serialVersionUID = 1L; 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); } @Override public String execute() throws Exception { HttpServletResponse response = ServletActionContext.getResponse(); // HttpServletRequest request = ServletActionContext.getRequest(); // HttpSession session = request.getSession(); // 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.setMaxInactiveInterval(120); //设置验证码有效时间120s session.setAttribute("checkCode", rands); input.close(); outputStream.close(); return SUCCESS; } }
验证码xml配置:
<action name="checkimage" class="ni.jun.yang.action.CreateImageAction"> <result name="success" type="stream"></result> </action>
页面jsp代码:
<%@ page language="Java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%@taglib uri="/struts-tags" prefix = "s" %> <!DOCTYPE HTML > <html> <head> <base href="<%=basePath%>"> <title>登录</title> <meta charset="utf-8"> <script src="jquery-3.2.1.min.js"></script> </head> <body> <script> $(function(){ $("#check").blur(function(){ var checkcode = $(this).val(); alert(checkcode); $.ajax({ url:"checkimage1", data:{check:checkcode}, type:"post", dataType:"json", success:function(result){ alert(result.result); } }); }); }); </script> <s:form action="loginaction" theme="simple"> 帐户:<s:textfield name = "userName"></s:textfield><br/> 密码:<s:password name = "psw"></s:password><br/> 验证码:<img src="checkimage"><s:textfield name = "check" id="check"></s:textfield><br/> <s:submit value="登录"></s:submit> </s:form> </body> </html>
登录处理action:
package ni.jun.yang.action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionContext; import net.sf.json.JSONObject; import ni.jun.yang.service.LoginService; import ni.jun.yang.bean.User; import ni.jun.yang.service.*; public class LoginAction { private String userName; private String psw; private String check; private JSONObject result; public LoginAction() { } public JSONObject getResult() { return result; } public void setResult(JSONObject result) { this.result = result; } public String getCheck() { return check; } public void setCheck(String check) { this.check = check; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPsw() { return psw; } public void setPsw(String psw) { this.psw = psw; } public String execute(){ // HttpServletRequest request = ServletActionContext.getRequest(); // String xString = request.getParameter("userName"); // System.out.println("请求获取:"+xString); // System.out.println("--------"); // System.out.println("参数封装:"+userName); // // request.setAttribute("userName", userName); // LoginService ls = new LoginService(); String checkCode = (String) ActionContext.getContext().getSession().get("checkCode"); if(check.equals(checkCode)){ IUserService ius = new UserServiceImpl(); User user1 = new User(); user1.setUserName(userName); user1.setUserPsw(psw); User user = ius.selectUser(user1); System.out.println(user.getUserSex()); if(user != null){ HttpSession session = ServletActionContext.getRequest().getSession(); session.setMaxInactiveInterval(30*60); //登录成功设置session时间1800s return "success"; }else{ return "fail"; } }else{ return "fail"; } } public String execute1(){ // ajax 异步验证验证码 String checkCode = (String) ActionContext.getContext().getSession().get("checkCode"); result = new JSONObject(); if(check.equals(checkCode)){ result.accumulate("result", "正确!"); }else{ result.accumulate("result", "错误!"); } return "success"; } }
ajax请求的xml配置:
<package name="mystrusts1" extends="json-default" namespace="/"> <action name="checkimage1" class="ni.jun.yang.action.LoginAction" method="execute1"> <result name="success" type="json"> <param name="root">result</param> </result> </action> </package>
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