RequestContextHolder获取request和response

RequestContextHolder获取request和response

2019年03月16日 15:18:15 whp404 阅读数：21更多

个人分类： Spring

 

首先需要在web.xml中配置监听器，这个监听器源码如下,实现了ServletRequestListener，则每个请求进来都会被监听

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package org.springframework.web.context.request;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;
import org.springframework.context.i18n.LocaleContextHolder;
public class RequestContextListener implements ServletRequestListener {
    private static final String REQUEST_ATTRIBUTES_ATTRIBUTE = RequestContextListener.class.getName() + ".REQUEST_ATTRIBUTES";
    public RequestContextListener() {
    }
    public void requestInitialized(ServletRequestEvent requestEvent) {
        if (!(requestEvent.getServletRequest() instanceof HttpServletRequest)) {
            throw new IllegalArgumentException("Request is not an HttpServletRequest: " + requestEvent.getServletRequest());
        } else {
            HttpServletRequest request = (HttpServletRequest)requestEvent.getServletRequest();
            ServletRequestAttributes attributes = new ServletRequestAttributes(request);
            request.setAttribute(REQUEST_ATTRIBUTES_ATTRIBUTE, attributes);
            LocaleContextHolder.setLocale(request.getLocale());
            RequestContextHolder.setRequestAttributes(attributes);//将request包装的ServletRequestAttributes放入RequestContextHolder
        }
    }
    public void requestDestroyed(ServletRequestEvent requestEvent) {
        ServletRequestAttributes attributes = (ServletRequestAttributes)requestEvent.getServletRequest().getAttribute(REQUEST_ATTRIBUTES_ATTRIBUTE);
        ServletRequestAttributes threadAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
        if (threadAttributes != null) {
            if (attributes == null) {
                attributes = threadAttributes;
            }
            LocaleContextHolder.resetLocaleContext();
            RequestContextHolder.resetRequestAttributes();  //将ServletRequestAttributes等资源清除掉
        }
        if (attributes != null) {
            attributes.requestCompleted();
        }
    }
}

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web.xml中配置如下

<listener>
      <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
spring中获取request 和 response代码
  HttpServletRequest req = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
  HttpServletResponse resp = ((ServletWebRequest)RequestContextHolder.getRequestAttributes()).g