建设网站建议,课程设计超市会员网站建设,自己做网站要会什么软件下载,智能建站推荐在Spring Boot中#xff0c;拦截器是通过实现HandlerInterceptor接口来实现的。它允许你在请求到达控制器方法之前和之后执行自定义的逻辑。下面我将为你提供一个简单的Spring Boot拦截器的例子。
假设我们有一个简单的控制器类UserController#xff0c;其中有两个请求处理…在Spring Boot中拦截器是通过实现HandlerInterceptor接口来实现的。它允许你在请求到达控制器方法之前和之后执行自定义的逻辑。下面我将为你提供一个简单的Spring Boot拦截器的例子。
假设我们有一个简单的控制器类UserController其中有两个请求处理方法getUser和saveUser我们希望在每次请求这两个方法前后记录日志。
1. 创建一个拦截器类 LoggingInterceptor 实现 HandlerInterceptor 接口
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;public class LoggingInterceptor implements HandlerInterceptor {Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println(Before handling request. URL: request.getRequestURL());return true; // Returning true allows the request to continue to the controller method. Returning false will stop the request.}Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {System.out.println(After handling request. URL: request.getRequestURL());}Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {// This method is called after the view rendering is complete.// It can be used for resource cleanup tasks.}
} 2. 在Spring Boot中注册拦截器创建一个配置类InterceptorConfig
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;Configuration
public class InterceptorConfig implements WebMvcConfigurer {Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoggingInterceptor());}
} 3. 创建一个简单的UserController
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;RestController
public class UserController {GetMapping(/user)public String getUser(RequestParam(id) String userId) {System.out.println(Getting user: userId);return User: userId;}PostMapping(/user)public String saveUser(RequestParam(name) String username) {System.out.println(Saving user: username);return Saved user: username;}
} 4. 运行Spring Boot应用然后通过浏览器或者API请求测试
当访问http://localhost:8080/user?id123时控制台输出 Before handling request. URL: http://localhost:8080/user?id123 Getting user: 123 After handling request. URL: http://localhost:8080/user?id123 当通过POST请求http://localhost:8080/user参数为nameJohn Doe时控制台输出 Before handling request. URL: http://localhost:8080/user Saving user: John Doe After handling request. URL: http://localhost:8080/user 以上就是一个简单的Spring Boot拦截器的例子它会在请求到达控制器方法前后记录日志。实际应用中你可以根据需要在拦截器中添加更多的逻辑比如权限验证、异常处理等。
