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代码简介 springmvc中自己实现的token防表单重复提交,防止二次提交！！！代码片段 一：首先创建一个token处理类 ，这里的类名叫 TokenHandler
private static Logger logger = Logger.getLogger(TokenHandler.class);
static Map<String, String> springmvc_token = new HashMap<String, String>();
//生成一个唯一值的token
@SuppressWarnings("unchecked")
public synchronized static String generateGUID(HttpSession session) {
String token = "";
try {
Object obj = session.getAttribute("SPRINGMVC.TOKEN");
if(obj!=null)
springmvc_token = (Map<String,String>)session.getAttribute("SPRINGMVC.TOKEN");
token = new BigInteger(165, new Random()).toString(36)
.toUpperCase();
springmvc_token.put(Constants.DEFAULT_TOKEN_NAME + "." + token,token);
session.setAttribute("SPRINGMVC.TOKEN", springmvc_token);
Constants.TOKEN_VALUE = token;
} catch (IllegalStateException e) {
logger.error("generateGUID() mothod find bug,by token session...");
}
return token;
}
//验证表单token值和session中的token值是否一致
@SuppressWarnings("unchecked")
public static boolean validToken(HttpServletRequest request) {
String inputToken = getInputToken(request);
if (inputToken == null) {
logger.warn("token is not valid!inputToken is NULL");
return false;
}
HttpSession session = request.getSession();
Map<String, String> tokenMap = (Map<String, String>) session.getAttribute("SPRINGMVC.TOKEN");
if (tokenMap == null || tokenMap.size() < 1) {
logger.warn("token is not valid!sessionToken is NULL");
return false;
}
String sessionToken = tokenMap.get(Constants.DEFAULT_TOKEN_NAME + "."
+ inputToken);
if (!inputToken.equals(sessionToken)) {
logger.warn("token is not valid!inputToken='" + inputToken
+ "',sessionToken = '" + sessionToken + "'");
return false;
}
tokenMap.remove(Constants.DEFAULT_TOKEN_NAME + "." + inputToken);
session.setAttribute("SPRINGMVC.TOKEN", tokenMap);
return true;
}
//获取表单中token值
@SuppressWarnings("unchecked")
public static String getInputToken(HttpServletRequest request) {
Map params = request.getParameterMap();
if (!params.containsKey(Constants.DEFAULT_TOKEN_NAME)) {
logger.warn("Could not find token name in params.");
return null;
}
String[] tokens = (String[]) (String[]) params
.get(Constants.DEFAULT_TOKEN_NAME);
if ((tokens == null) || (tokens.length < 1)) {
logger.warn("Got a null or empty token name.");
return null;
}
return tokens[0];
}代码片段 三 ：这是我用到的常量： public static String DEFAULT_TOKEN_MSG_JSP = "unSubmit.jsp" ; public static String TOKEN_VALUE ; public static String DEFAULT_TOKEN_NAME = "springMVC.token"; 代码片段 二： 自己实现一个自定义标签 这里我自定义的标签叫： <dy:token/> (自定义标签的代码实现，我放csdn上了，不会的赶紧去下载，这里我不讲了)，页面中使用如下：
1：引入标签库：<%@ taglib prefix="dy" uri="/dy-tags"%>
2:jsp页面中的表单，注意加上token标签！！！如下：
index.jsp!!!
<%@ taglib prefix="dy" uri="/dy-tags"%>
<html>
<head>
<title>spring mvc</title>
</head>
<body>
welcome to spring mvc!<br/>
<form name="mvcForm" action="indexSubmit.do" method="post">
<dy:token/>
username: <input name="username" type="text" value="${user.username}"/>
password: <input name="password" type="text" value="${user.password}"/>
email: <input name="email" type="text" value="${user.email}"/>
<input type="submit" value="提交">
</form>
</body>
</html>
代码片段 四： 我MyController类的以下2个方法要用到token，防止表单重复提交
@RequestMapping(value = "index.do")
public String index(HttpServletRequest request) {
return "index";
}
@RequestMapping(value = "indexSubmit.do", method = RequestMethod.POST)
public String indexSubmit(User user,HttpServletRequest request) {
try {
myService.insert(user);
logger.info("info=新增成功");
} catch (Exception e) {
logger.error("exception:" + e);
}代码片段 五：以下是我拦截器的实现，注意有两个拦截器，一个生成token，一个验证token。
/**
* @Title
* @author dengyang
* @date 2013-6-4
*/
public class TokenHandlerInterceptor implements HandlerInterceptor{
public void afterCompletion(HttpServletRequest arg0,
HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
}
public void postHandle(HttpServletRequest request, HttpServletResponse response,
Object arg2, ModelAndView arg3) throws Exception {
TokenHandler.generateGUID(request.getSession());
}
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object arg2) throws Exception {
return true;
}
}
/**
* @Title
* @author dengyang
* @date 2013-6-4
*/
public class TokenValidInterceptor implements HandlerInterceptor{
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object arg2, Exception arg3)
throws Exception {
}
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2, ModelAndView arg3) throws Exception {
}
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object arg2) throws Exception {
if(!TokenHandler.validToken(request)){
response.sendRedirect(Constants.DEFAULT_TOKEN_MSG_JSP);
return false;
}
return true;
}
}
代码片段 六：ok，这下面是我的spring拦截器配置 <mvc:interceptor> <mvc:mapping path="/index.do" />-->这个请求返回的是你有token的页面 <bean class="com.dengyang.interceptor.TokenHandlerInterceptor" /> </mvc:interceptor> <mvc:interceptor> <mvc:mapping path="/indexSubmit.do" />-->这个是提交请求 <bean class="com.dengyang.interceptor.TokenValidInterceptor" /> </mvc:interceptor> 七：ok，总体实现原理和struts的token标签类似，有问题请留言... |
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