spring-boot后端解决跨域问题

约定不等于承诺〃 2023-06-15 06:41 2阅读 0赞

# 代码 #

import cn.hutool.log.Log;
    import cn.hutool.log.LogFactory;
    import com.alibaba.fastjson.JSONObject;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import javax.servlet.*;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.util.*;
    
    /** * Copyright (C), 2019-2019, 北京力盟亚有限公司 * @Description: 过滤器 * @Author: qianxi * @Date: 2019/10/28 17:47 * @version:1.0 */
    //@WebFilter(value="/*",filterName = "aaaaaLoggingFilter" )
    @Configuration
    public class LoggingFilterConfig  implements Filter { 
    // @Override
        public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { 
            log.info("接收Object报文：{} \n Exception={} " , o , e );
        }
        @Bean
        public FilterRegistrationBean registrationBean(){ 
            FilterRegistrationBean filter = new FilterRegistrationBean(new LoggingFilterConfig());
            filter.addUrlPatterns("/*");
            //多个过滤器时执行顺序
            // 最高级别。
            filter.setOrder(FilterRegistrationBean.HIGHEST_PRECEDENCE);
            return filter;
        }
    
        private final static Log log = LogFactory.get();
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException { 
    
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse res,
                             FilterChain chain) throws IOException, ServletException { 
            // TODO Auto-generated method stub
            request.setCharacterEncoding("UTF-8");
            res.setCharacterEncoding("UTF-8");
    
            HttpServletRequest req = (HttpServletRequest)request;
            Map<String, Object> map = new HashMap<String, Object>();
    
            // Get request URL.
            map.put("URL", req.getRequestURL());
            map.put("Method", req.getMethod());
            map.put("Protocol",req.getProtocol());
            // 获取header信息
    
            List<Map<String,String>> headerList = new ArrayList<>();
            Map<String,String> headerMaps = new HashMap<String,String>();
            for(Enumeration<String> enu = req.getHeaderNames(); enu.hasMoreElements();){ 
                String name = enu.nextElement();
                headerMaps.put(name,req.getHeader(name));
            }
            headerList.add(headerMaps);
            map.put("headers", headerList);
            //获取parameters信息
    
            List<Map<String,String>> parameterList = new ArrayList<>();
            Map<String,String> parameterMaps = new HashMap<String,String>();
            for(Enumeration<String> names = req.getParameterNames();names.hasMoreElements();){ 
                String name = names.nextElement();
                parameterMaps.put(name, req.getParameter(name));
            }
            parameterList.add(parameterMaps);
            map.put("parameters", parameterList);
            String line = "";
            // 获取请求体信息
    // if (req.getMethod().equalsIgnoreCase("POST")) { 
    // int len = req.getContentLength();
    // char[] buf = new char[len];
    // int bufcount = requestWrapper.getReader().read(buf);
    // if (len > 0 && bufcount <= len) { 
    // line = String.copyValueOf(buf).substring(0, bufcount);
    // }
    // } else if (req.getMethod().equalsIgnoreCase("GET")) { 
            int idx = req.getRequestURL().indexOf("?");
            if (idx != -1) { 
                line = req.getRequestURL().substring(idx + 1);
            } else { 
                line = null;
            }
    // }
    
            if (line != null) { 
                map.put("Context", new String[] {  line });
            }
            log.info("接收请求报文：\n"+ JSONObject.toJSONString(map));
            HttpServletResponse response = (HttpServletResponse) res;
            // 解决跨域问题。
            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
            chain.doFilter(request, response);
            // 辞书
    // log.info("接收response报文：\n"+ response.getContentType());
        }
    
        @Override
        public void destroy() { 
    
        }
    
    }

# 参考资料 #

*  [java后端解决跨域问题][java]

[java]: https://blog.csdn.net/weixin_41383527/article/details/79237438