1 package cn.itcast.javaee.js.checkcode;
 2 
 3 import java.io.PrintWriter;
 4 import javax.servlet.http.HttpServletResponse;
 5 import org.apache.struts2.ServletActionContext;
 6 import com.opensymphony.xwork2.ActionContext;
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 /**
10 * 验证码检查
11 * @author AdminTC
12 */
13 public class CheckcodeAction extends ActionSupport{
14 //客户端验证码
15 private String checkcode;//2525
16 //注入客户端验证码
17 public void setCheckcode(String checkcode) {
18 this.checkcode = checkcode;
19 }
20 /**
21 * 验证
22 */    
23 public String check() throws Exception {
24 //图片路径
25 String tip = "images/MsgError.gif";
26 //从服务器获取session中的验证码
27 String checkcodeServer = (String) ActionContext.getContext().getSession().get("CHECKNUM");
28 //将客户端的验证码与服务端的验证码进行比较
29 if(checkcode.equals(checkcodeServer)){
30 tip = "images/MsgSent.gif";
31 }
32 //以IO流的方式将tip变量的值输出到AJAX异步对象中
33 HttpServletResponse response = ServletActionContext.getResponse();
34 response.setContentType("text/html;charset=UTF-8");
35 PrintWriter pw = response.getWriter();
36 pw.write(tip);
37 pw.flush();
38 pw.close();
39 //以下方式不是最好的，但可以完成AJAX异步交互
40 return null;
41 }
42 }