繼承HandlerInterceptorAdapter確實可以攔截，但是afterCompletion在preHandle方法返回false后并
不執行，那么只能在preHandle中處理了，比如轉向，ajax請求返回內容
3,關于快速跳轉
有時候只是做一個簡單的跳轉，可以集中寫在這里
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/index").setViewName("/index");
registry.addViewController("/converter").setViewName("/converter");
}
完整示例：
package com.example.demo.config;
import java.util.List;
import javax.servlet.MultipartConfigElement;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
//其中默認配置的 /** 映射到 /static （或/public、/resources、/META-INF/resources）
//其中默認配置的 /webjars/** 映射到 classpath:/META-INF/resources/webjars/
/*
spring.mvc.static-path-pattern=
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/myres/**").addResourceLocations("classpath:/myres/");
//使用外部目錄 registry.addResourceHandler("/api_files/**").addResourceLocations("file:D:/data/api_files");
super.addResourceHandlers(registry);
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
viewResolver.setViewClass(JstlView.class);
return viewResolver;
}
//攔截器
@Override
public void addInterceptors(InterceptorRegistry registry) {// 2
InterceptorRegistration i=registry.addInterceptor(demoInterceptor());
i.addPathPatterns("/jsp/*");//只攔截 /jsp/* 的action
}
@Bean
// 1 配置攔截器
public DemoInterceptor demoInterceptor() {
return new DemoInterceptor();
}
//快速轉向
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// registry.addViewController("/index").setViewName("/index");
registry.addViewController("/toUpload").setViewName("/upload");
registry.addViewController("/converter").setViewName("/converter");
registry.addViewController("/sse").setViewName("/sse");
registry.addViewController("/async").setViewName("/async");
}
@Bean
public MultipartConfigElement multipartConfigElement() {
MultipartConfigFactory factory = new MultipartConfigFactory();
factory.setMaxFileSize("128KB");
factory.setMaxRequestSize("128KB");
return factory.createMultipartConfig();
}
}
攔截器類
public class DemoInterceptor extends HandlerInterceptorAdapter {// 1
@Override
public boolean preHandle(HttpServletRequest request, // 2
HttpServletResponse response, Object handler) throws Exception {
long startTime = System.currentTimeMillis();
System.out.println("本次始請求處理時間為:" + startTime + "ms");
request.setAttribute("startTime", startTime);
if (request.getHeader("x-requested-with") != null
&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
response.setHeader("sessionstatus", "timeout"); // 響應頭設置session狀態
} else {
response.sendRedirect("/");
}
return false;
}
@Override
public void postHandle(HttpServletRequest request, // 3
HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
long startTime = (Long) request.getAttribute("startTime");
request.removeAttribute("startTime");
long endTime = System.currentTimeMillis();
System.out.println("本次請求處理時間??:" + new Long(endTime - startTime) + "ms");
request.setAttribute("handlingTime", endTime - startTime);
}
}