如何在AOP中获取Request和Response对象

蔚落 2024-02-18 16:58 51阅读 0赞

## [spring aop 获取request、response对象][spring aop _request_response] ##

在网上看到有不少人说如下方式获取：

1.在web.xml中添加监听

<listener>  
<listener-class>  
org.springframework.web.context.request.RequestContextListener  
</listener-class>  
</listener>

2.在aop类中有以下两种方式获取

@Autowired  
HttpServletRequest request; //这里可以获取到request

或者

HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();

但是我试后，发现都获取不到。

既然这样那就要用其他方式获取了。

1. 新建一个存储request、response对象的类

![复制代码][copycode.gif]

import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    public class SysContent {
        private static ThreadLocal<HttpServletRequest> requestLocal = new ThreadLocal<HttpServletRequest>();
        private static ThreadLocal<HttpServletResponse> responseLocal = new ThreadLocal<HttpServletResponse>();
    
        public static HttpServletRequest getRequest() {
            return (HttpServletRequest) requestLocal.get();
        }
    
        public static void setRequest(HttpServletRequest request) {
          
            requestLocal.set(request);
        }
    
        public static HttpServletResponse getResponse() {
          
            return (HttpServletResponse) responseLocal.get();
        }
    
        public static void setResponse(HttpServletResponse response) {
          
            responseLocal.set(response);
        }
    
        public static HttpSession getSession() {
            return (HttpSession) ((HttpServletRequest) requestLocal.get()).getSession();
        }
    }

![复制代码][copycode.gif]

2. 新建一个filter，并在web.xml中添加filter配置

![复制代码][copycode.gif]

import java.io.IOException;
    
    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;
    
    public class InitContent implements Filter {
    
        @Override
        public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
                throws IOException, ServletException {
            SysContent.setRequest((HttpServletRequest) arg0);
            SysContent.setResponse((HttpServletResponse) arg1);
            arg2.doFilter(arg0, arg1);
        }
    
        @Override
        public void init(FilterConfig arg0) throws ServletException {
        }
        @Override
        public void destroy() {
        }
    
    }

![复制代码][copycode.gif]

web.xml

![复制代码][copycode.gif]

<filter>
            <filter-name>InitContent</filter-name>
            <filter-class>com.*.filter.InitContent</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>InitContent</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>

![复制代码][copycode.gif]

这样一来，每次请求的request、response都存在了ThreadLocal中，每次需要的时候从里面获取即可

HttpServletRequest request = SysContent.getRequest();  
HttpServletResponse response = SysContent.getResponse();  
HttpSession session = SysContent.getSession();

[spring aop _request_response]: http://www.cnblogs.com/qlong8807/p/7573175.html
[copycode.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/ab680f9ff9664b619e3066fee373998c.png