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1. 在方法参数中声明
最常见和推荐的方式是在控制器方法的参数中直接声明HttpServletRequest和HttpServletResponse对象。Sp…在Spring Boot中你可以以多种方式获取当前请求的HttpServletRequest和HttpServletResponse对象。以下是几种常见的写法示例
1. 在方法参数中声明
最常见和推荐的方式是在控制器方法的参数中直接声明HttpServletRequest和HttpServletResponse对象。Spring Boot会自动将它们注入到方法中。
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;RestController
public class MyController {GetMapping(/hello1)public String hello1(HttpServletRequest request, HttpServletResponse response) {// 使用 request 对象String method request.getMethod();String uri request.getRequestURI();// 使用 response 对象response.setContentType(text/plain);response.setStatus(HttpServletResponse.SC_OK);return Hello 1, Spring Boot!;}
}2. 使用 RequestMappingHandlerAdapter
你可以通过注入RequestMappingHandlerAdapter来手动获取HttpServletRequest和HttpServletResponse对象。这种方式比较灵活但相对较少使用。
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;RestController
public class MyController {Autowiredprivate RequestMappingHandlerAdapter handlerAdapter;GetMapping(/hello2)public String hello2(HttpServletRequest request, HttpServletResponse response) throws Exception {// 通过 handlerAdapter 获取 request 和 response 对象HttpServletRequest req (HttpServletRequest) handlerAdapter.getWebBindingInitializer().getBindingContext().getModel().get(org.springframework.web.servlet.HandlerMapping.uriTemplateVariables);// 使用 request 对象String method req.getMethod();String uri req.getRequestURI();// 使用 response 对象response.setContentType(text/plain);response.setStatus(HttpServletResponse.SC_OK);return Hello 2, Spring Boot!;}
}3. 使用 ThreadLocal
另一种方式是使用ThreadLocal来存储当前的HttpServletRequest和HttpServletResponse对象然后在需要时从ThreadLocal中获取。
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;RestController
public class MyController {GetMapping(/hello3)public String hello3() {// 从 RequestContextHolder 中获取 ServletRequestAttributesServletRequestAttributes attributes (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();// 获取 HttpServletRequest 对象HttpServletRequest request attributes.getRequest();// 获取 HttpServletResponse 对象HttpServletResponse response attributes.getResponse();// 使用 request 对象String method request.getMethod();String uri request.getRequestURI();// 使用 response 对象response.setContentType(text/plain);response.setStatus(HttpServletResponse.SC_OK);return Hello 3, Spring Boot!;}
}总结
以上是在Spring Boot中常见的几种方式获取当前请求的HttpServletRequest和HttpServletResponse对象。推荐使用第一种方式即在方法参数中声明因为它简单直观且符合Spring Boot的最佳实践。
