springMVC中基于token防止表单重复提交方法
本文介绍了springMVC中基于token防止表单重复提交方法,分享给大家,具体如下:
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实现思路:
在springmvc配置文件中加入拦截器的配置,拦截两类请求,一类是到页面的,一类是提交表单的。当转到页面的请求到来时,生成token的名字和token值,一份放到redis缓存中,一份放传给页面表单的隐藏域。(注:这里之所以使用redis缓存,是因为tomcat服务器是集群部署的,要保证token的存储介质是全局线程安全的,而redis是单线程的)
当表单请求提交时,拦截器得到参数中的tokenName和token,然后到缓存中去取token值,如果能匹配上,请求就通过,不能匹配上就不通过。这里的tokenName生成时也是随机的,每次请求都不一样。而从缓存中取token值时,会立即将其删除(删与读是原子的,无线程安全问题)。
实现方式:
TokenInterceptor.Java
package com.xxx.www.common.interceptor; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.Logger; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; import com.xxx.cache.redis.IRedisCacheClient; import com.xxx.common.utility.JsonUtil; import com.xxx.www.common.utils.TokenHelper; /** * * @see TokenHelper */ public class TokenInterceptor extends HandlerInterceptorAdapter { private static Logger log = Logger.getLogger(TokenInterceptor.class); private static MapviewUrls = new HashMap (); private static Map actionUrls = new HashMap (); private Object clock = new Object(); @Autowired private IRedisCacheClient redisCacheClient; static { viewUrls.put("/user/regc/brandregnamecard/", "GET"); viewUrls.put("/user/regc/regnamecard/", "GET"); actionUrls.put("/user/regc/brandregnamecard/", "POST"); actionUrls.put("/user/regc/regnamecard/", "POST"); } { TokenHelper.setRedisCacheClient(redisCacheClient); } /** * 拦截方法,添加or验证token */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String url = request.getRequestURI(); String method = request.getMethod(); if(viewUrls.keySet().contains(url) && ((viewUrls.get(url)) == null || viewUrls.get(url).equals(method))) { TokenHelper.setToken(request); return true; } else if(actionUrls.keySet().contains(url) && ((actionUrls.get(url)) == null || actionUrls.get(url).equals(method))) { log.debug("Intercepting invocation to check for valid transaction token."); return handleToken(request, response, handler); } return true; } protected boolean handleToken(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { synchronized(clock) { if(!TokenHelper.validToken(request)) { System.out.println("未通过验证..."); return handleInvalidToken(request, response, handler); } } System.out.println("通过验证..."); return handleValidToken(request, response, handler); } /** * 当出现一个非法令牌时调用 */ protected boolean handleInvalidToken(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Map data = new HashMap (); data.put("flag", 0); data.put("msg", "请不要频繁操作!"); writeMessageUtf8(response, data); return false; } /** * 当发现一个合法令牌时调用. */ protected boolean handleValidToken(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return true; } private void writeMessageUtf8(HttpServletResponse response, Map json) throws IOException { try { response.setCharacterEncoding("UTF-8"); response.getWriter().print(JsonUtil.toJson(json)); } finally { response.getWriter().close(); } } }
TokenHelper.java
package com.xxx.www.common.utils; import java.math.BigInteger; import java.util.Map; import java.util.Random; import javax.servlet.http.HttpServletRequest; import org.apache.log4j.Logger; import com.xxx.cache.redis.IRedisCacheClient; /** * TokenHelper * */ public class TokenHelper { /** * 保存token值的默认命名空间 */ public static final String TOKEN_NAMESPACE = "xxx.tokens"; /** * 持有token名称的字段名 */ public static final String TOKEN_NAME_FIELD = "xxx.token.name"; private static final Logger LOG = Logger.getLogger(TokenHelper.class); private static final Random RANDOM = new Random(); private static IRedisCacheClient redisCacheClient;// 缓存调用,代替session,支持分布式 public static void setRedisCacheClient(IRedisCacheClient redisCacheClient) { TokenHelper.redisCacheClient = redisCacheClient; } /** * 使用随机字串作为token名字保存token * * @param request * @return token */ public static String setToken(HttpServletRequest request) { return setToken(request, generateGUID()); } /** * 使用给定的字串作为token名字保存token * * @param request * @param tokenName * @return token */ private static String setToken(HttpServletRequest request, String tokenName) { String token = generateGUID(); setCacheToken(request, tokenName, token); return token; } /** * 保存一个给定名字和值的token * * @param request * @param tokenName * @param token */ private static void setCacheToken(HttpServletRequest request, String tokenName, String token) { try { String tokenName0 = buildTokenCacheAttributeName(tokenName); redisCacheClient.listLpush(tokenName0, token); request.setAttribute(TOKEN_NAME_FIELD, tokenName); request.setAttribute(tokenName, token); } catch(IllegalStateException e) { String msg = "Error creating HttpSession due response is commited to client. You can use the CreateSessionInterceptor or create the HttpSession from your action before the result is rendered to the client: " + e.getMessage(); LOG.error(msg, e); throw new IllegalArgumentException(msg); } } /** * 构建一个基于token名字的带有命名空间为前缀的token名字 * * @param tokenName * @return the name space prefixed session token name */ public static String buildTokenCacheAttributeName(String tokenName) { return TOKEN_NAMESPACE + "." + tokenName; } /** * 从请求域中获取给定token名字的token值 * * @param tokenName * @return the token String or null, if the token could not be found */ public static String getToken(HttpServletRequest request, String tokenName) { if(tokenName == null) { return null; } Map params = request.getParameterMap(); String[] tokens = (String[]) (String[]) params.get(tokenName); String token; if((tokens == null) || (tokens.length < 1)) { LOG.warn("Could not find token mapped to token name " + tokenName); return null; } token = tokens[0]; return token; } /** * 从请求参数中获取token名字 * * @return the token name found in the params, or null if it could not be found */ public static String getTokenName(HttpServletRequest request) { Map params = request.getParameterMap(); if(!params.containsKey(TOKEN_NAME_FIELD)) { LOG.warn("Could not find token name in params."); return null; } String[] tokenNames = (String[]) params.get(TOKEN_NAME_FIELD); String tokenName; if((tokenNames == null) || (tokenNames.length < 1)) { LOG.warn("Got a null or empty token name."); return null; } tokenName = tokenNames[0]; return tokenName; } /** * 验证当前请求参数中的token是否合法,如果合法的token出现就会删除它,它不会再次成功合法的token * * @return 验证结果 */ public static boolean validToken(HttpServletRequest request) { String tokenName = getTokenName(request); if(tokenName == null) { LOG.debug("no token name found -> Invalid token "); return false; } String token = getToken(request, tokenName); if(token == null) { if(LOG.isDebugEnabled()) { LOG.debug("no token found for token name " + tokenName + " -> Invalid token "); } return false; } String tokenCacheName = buildTokenCacheAttributeName(tokenName); String cacheToken = redisCacheClient.listLpop(tokenCacheName); if(!token.equals(cacheToken)) { LOG.warn("xxx.internal.invalid.token Form token " + token + " does not match the session token " + cacheToken + "."); return false; } // remove the token so it won't be used again return true; } public static String generateGUID() { return new BigInteger(165,RANDOM).toString(36).toUpperCase(); } }
spring-mvc.xml
input.jsp 在form中加如下内容:
" value="<%=token %>"/> "/>
当前这里也可以用类似于struts2的自定义标签来做。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
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