springboot踩坑篇-01--@EnableWebMvc注解和@EnableAutoConfiguration 注解

springboot踩坑篇-01

springboot踩坑篇-01–@EnableWebMvc注解和@EnableAutoConfiguration 注解
问题出现

最近项目在用springboot开发，项目当中要用到spring的拦截器;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.jcl.gycms.entity.LoginLogs;
import com.jcl.gycms.service.LoginLogsService;

/**

• @author zpf

• @version 1.0
  */
  @Component
  public class LoginInterceptor implements HandlerInterceptor {

  @Autowired
  private LoginLogsService loginLogsService;
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
  throws Exception {
  return true;
  }

  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
  ModelAndView modelAndView) throws Exception {
  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
  throws Exception {
  String username = (String) request.getSession().getAttribute(“isLogin”);
  if(StringUtils.isNotBlank(username)) {
  LoginLogs loginLogs = new LoginLogs();
  loginLogs.setLoginname(username);
  loginLogs.setLogintime(new Date());
  String localAddr = request.getLocalAddr();
  String ip = request.getRemoteAddr();
  System.out.println("–localAddr"+localAddr+"----ip"+ip);
  loginLogs.setLoginip(request.getLocalAddr());
  int i = loginLogsService.saveSelective(loginLogs);
  if(i>0) {
  System.out.println(“记录登录日志-----成功”);
  }
  }
  }
  }

在配置拦截器时用到了@EnableWebMvc
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**

• @author zpf

• @version 1.0
  */
  @EnableWebMvc
  @Configuration
  public class LoginConfiguration extends WebMvcConfigurerAdapter{

  @Bean
  LoginInterceptor localInterceptor() {
  System.out.println(“将拦截器注册成bean”);
  return new LoginInterceptor();
  }
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
  System.out.println(“拦截登录了-------------------”);
  // 注册拦截器
  LoginInterceptor loginInterceptor = new LoginInterceptor();
  InterceptorRegistration loginRegistry = registry.addInterceptor(loginInterceptor);
  // 拦截路径
  loginRegistry.excludePathPatterns("/WEB-INF/jsp");
  loginRegistry.addPathPatterns("/adminLogin/**");

  }
  }

然后项目可以正常启动，但是当我访问项目是

查看后台发现报错Could not resolve view with name ‘index’ in servlet with name ‘dispatcherServlet’–路径映射不到，但是也没想到问题所在，于是只能问万能的度娘了

问题解决
参考了https://blog.youkuaiyun.com/testcs_dn/article/details/80249894微wx笑的博客发现是@EnableWebMvc这个注解的问题

使用 @EnableWebMvc 注解，需要以编程的方式指定视图文件相关配置；
使用 @EnableAutoConfiguration 注解，会读取 application.properties 或 application.yml 文件中的配置。

解决1
换成@EnableAutoConfiguration
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
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.WebMvcConfigurerAdapter;

/**

• @author zpf

• @version 1.0
  */
  @EnableAutoConfiguration
  @Configuration
  public class LoginConfiguration extends WebMvcConfigurerAdapter{

  @Bean
  LoginInterceptor localInterceptor() {
  System.out.println(“将拦截器注册成bean”);
  return new LoginInterceptor();
  }
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
  System.out.println(“拦截登录了-------------------”);
  // 注册拦截器
  LoginInterceptor loginInterceptor = new LoginInterceptor();
  InterceptorRegistration loginRegistry = registry.addInterceptor(loginInterceptor);
  // 拦截路径
  loginRegistry.excludePathPatterns("/WEB-INF/jsp");
  loginRegistry.addPathPatterns("/adminLogin/**");

  }
  }

然后得到解决，可以访问了

解决二
在入口类注入视图解析器

import javax.servlet.MultipartConfigElement;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan({“com.jcl.gycms.mapper”})
public class GycmsApplication {
public static void main(String[] args) {
SpringApplication.run(GycmsApplication.class, args);
}
@Bean
public MultipartConfigElement multipartConfigElement() {
MultipartConfigFactory factory = new MultipartConfigFactory();
//单个文件最大
factory.setMaxFileSize(“10240KB”); //KB,MB
//设置总上传数据总大小
factory.setMaxRequestSize(“102400KB”);
return factory.createMultipartConfig();
}

@Bean
public InternalResourceViewResolver setupViewResolver() {
	InternalResourceViewResolver resolver = new InternalResourceViewResolver();
	/** 设置视图路径的前缀 */
	resolver.setPrefix("/WEB-INF/jsp/");
	/** 设置视图路径的后缀 */
	resolver.setSuffix(".jsp");
	return resolver;
}

}