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springMVC中基于token防止表单重复提交方法

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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:

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 。

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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 Map<String , String> viewUrls = new HashMap<String , String>();
   private static Map<String , String> actionUrls = new HashMap<String , String>();
   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<String , Object> data = new HashMap<String , Object>();
     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<String , Object> json) throws IOException
   {
     try
     {
       response.setCharacterEncoding( "UTF-8" );
       response.getWriter().print(JsonUtil.toJson(json));
     }
     finally
     {
       response.getWriter().close();
     }
   }
 
}

TokenHelper.java 。

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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 。

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<!-- token拦截器-->
   < bean id = "tokenInterceptor" class = "com.xxx.www.common.interceptor.TokenInterceptor" ></ bean >  
   < bean class = "org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" >  
     < property name = "interceptors" >  
       < list >  
         < ref bean = "tokenInterceptor" />  
       </ list >
     </ property >  
   </ bean >

input.jsp 在form中加如下内容:

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<input type= "hidden" name= "<%=request.getAttribute(" xxx.token.name ") %>" value= "<%=token %>" />
 
<input type= "hidden" name= "xxx.token.name" value= "<%=request.getAttribute(" xxx.token.name ") %>" />

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我.

原文链接:http://blog.csdn.net/letter_believe/article/details/76034791 。

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