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Springboot 如何实现filter拦截token验证和跨域

2021-08-12 14:31:30 作者：牧竹子

这篇文章主要介绍了Springboot 如何实现filter拦截token验证和跨域操作，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教

Springboot filter拦截token验证和跨域

背景

web验证授权合法的一般分为下面几种

使用session作为验证合法用户访问的验证方式
使用自己实现的token
使用OCA标准

在使用API接口授权验证时，token是自定义的方式实现起来不需要引入其他东西，关键是简单实用。

合法登陆后一般使用用户UID+盐值+时间戳使用多层对称加密生成token并放入分布式缓存中设置固定的过期时间长（和session的方式有些相同），这样当用户访问时使用token可以解密获取它的UID并据此验证其是否是合法的用户。

#springboot中实现filter

一种是注解filter
一种是显示的硬编码注册filter

先有filter

import javax.servlet.annotation.WebFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import springfox.documentation.spring.web.json.Json;
import com.alibaba.fastjson.JSON; 
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/***************
 * token验证拦截
 * @author bamboo zjcjava@163.com
 * @time 2017-08-01
 */
@Component
//@WebFilter(urlPatterns = { "/api/v/*" }, filterName = "tokenAuthorFilter")
public class TokenAuthorFilter implements Filter {
 private static Logger logger = LoggerFactory
   .getLogger(TokenAuthorFilter.class);
 @Override
 public void destroy() {
 }
 @Override
 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  HttpServletRequest req = (HttpServletRequest) request;
  HttpServletResponse rep = (HttpServletResponse) response;
  //设置允许跨域的配置
  // 这里填写你允许进行跨域的主机ip（正式上线时可以动态配置具体允许的域名和IP）
  rep.setHeader("Access-Control-Allow-Origin", "*");
  // 允许的访问方法
  rep.setHeader("Access-Control-Allow-Methods","POST, GET, PUT, OPTIONS, DELETE, PATCH");
  // Access-Control-Max-Age 用于 CORS 相关配置的缓存
  rep.setHeader("Access-Control-Max-Age", "3600");
  rep.setHeader("Access-Control-Allow-Headers","token,Origin, X-Requested-With, Content-Type, Accept");
  response.setCharacterEncoding("UTF-8");
  response.setContentType("application/json; charset=utf-8");
  String token = req.getHeader("token");//header方式
  ResultInfo resultInfo = new ResultInfo();
  boolean isFilter = false;  
   
  String method = ((HttpServletRequest) request).getMethod();
  if (method.equals("OPTIONS")) {
   rep.setStatus(HttpServletResponse.SC_OK);
  }else{
      
   if (null == token || token.isEmpty()) {
    resultInfo.setCode(Constant.UN_AUTHORIZED);
    resultInfo.setMsg("用户授权认证没有通过!客户端请求参数中无token信息");
   } else {
    if (TokenUtil.volidateToken(token)) {
     resultInfo.setCode(Constant.SUCCESS);
     resultInfo.setMsg("用户授权认证通过!");
     isFilter = true;
    } else {
     resultInfo.setCode(Constant.UN_AUTHORIZED);
     resultInfo.setMsg("用户授权认证没有通过!客户端请求参数token信息无效");
    }
   }
   if (resultInfo.getCode() == Constant.UN_AUTHORIZED) {// 验证失败
    PrintWriter writer = null;
    OutputStreamWriter osw = null;
    try {
     osw = new OutputStreamWriter(response.getOutputStream(),
       "UTF-8");
     writer = new PrintWriter(osw, true);
     String jsonStr = JSON.toJSONString(resultInfo);
     writer.write(jsonStr);
     writer.flush();
     writer.close();
     osw.close();
    } catch (UnsupportedEncodingException e) {
     logger.error("过滤器返回信息失败:" + e.getMessage(), e);
    } catch (IOException e) {
     logger.error("过滤器返回信息失败:" + e.getMessage(), e);
    } finally {
     if (null != writer) {
      writer.close();
     }
     if (null != osw) {
      osw.close();
     }
    }
    return;
   }
   
   if (isFilter) {
   logger.info("token filter过滤ok!");
   chain.doFilter(request, response);
   }
  } 
 }
 @Override
 public void init(FilterConfig arg0) throws ServletException {
 }
}

注解配置filter

加上如下配置则启动时会根据注解加载此filter

@WebFilter(urlPatterns = { “/api/*” }, filterName = “tokenAuthorFilter”)

硬编码注册filter

在application.java中加入如下代码

    //注册filter
    @Bean  
    public FilterRegistrationBean  filterRegistrationBean() {  
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();  
        TokenAuthorFilter tokenAuthorFilter = new TokenAuthorFilter();  
        registrationBean.setFilter(tokenAuthorFilter);  
        List<String> urlPatterns = new ArrayList<String>();  
        urlPatterns.add("/api/*");
        registrationBean.setUrlPatterns(urlPatterns);  
        return registrationBean;  
    }

以上两种方式都可以实现filter

跨域说明

springboot可以设置全局跨域，但是对于filter中的拦截地址并不其中作用，因此需要在dofilter中再次设置一次

区局设置跨域方式如下

方式1.在application.java中加入如下代码

 //跨域设置
 private CorsConfiguration buildConfig() {  
        CorsConfiguration corsConfiguration = new CorsConfiguration();  
        corsConfiguration.addAllowedOrigin("*");  
        corsConfiguration.addAllowedHeader("*");  
        corsConfiguration.addAllowedMethod("*");         
        return corsConfiguration;  
    }  
      
    /** 
     * 跨域过滤器 
     * @return 
     */  
    @Bean  
    public CorsFilter corsFilter() {  
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();  
        source.registerCorsConfiguration("/**", buildConfig()); // 4  
        return new CorsFilter(source);  
    }

方式2.配置注解

必须集成WebMvcConfigurerAdapter类

/**********
 * 跨域 CORS:使用 方法3
 * 方法:
 1服务端设置Respone Header头中Access-Control-Allow-Origin
 2配合前台使用jsonp
 3继承WebMvcConfigurerAdapter 添加配置类
 http://blog.csdn.net/hanghangde/article/details/53946366
 * @author xialeme
 *
 */
@Configuration  
public class CorsConfig extends WebMvcConfigurerAdapter{  
  
   /* @Override  
    public void addCorsMappings(CorsRegistry registry) {  
        registry.addMapping("/**")  
                .allowedOrigins("*")  
                .allowCredentials(true)  
                .allowedMethods("GET", "POST", "DELETE", "PUT")  
                .maxAge(3600);  
    }  */
  
 private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*"); // 1
        corsConfiguration.addAllowedHeader("*"); // 2
        corsConfiguration.addAllowedMethod("*"); // 3
        return corsConfiguration;
    }
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4
        return new CorsFilter(source);
    }     
}

springboot配置Filter & 允许跨域请求

1.filter类

加注解：

@WebFilter(filterName = "authFilter", urlPatterns = "/*")

代码如下：

package com.activiti.filter; 
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
// renwenqiang
@WebFilter(filterName = "authFilter", urlPatterns = "/*")
public class SystemFilter implements Filter {
 
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException,
            ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin","*");
        System.out.println(request.getRequestURL());
        filterChain.doFilter(request, servletResponse);
    }
 
    @Override
    public void destroy() { 
    }
 
    @Override
    public void init(FilterConfig arg0) throws ServletException { 
    }
}

2.启动类