spring aop 获取request、response对象

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

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();
    }
}

2. 新建一个filter，并在web.xml中添加filter配置

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() {
    }

}

web.xml

    <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>

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();