1天搞定SpringBoot+Vue全栈开发 (1)文件上传与拦截器

package com.example.helloworld.controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
 
 
@RestController
public class FileUploadController {
    @PostMapping("/upload") //等价于RequestMapping(value="/upload",method=RequestMethod.POST)
    //昵称 头像
    public String up(String nickname, MultipartFile photo, HttpServletRequest request) throws IOException {
        //昵称
        System.out.println(nickname);
        //获取图片的原始名称
        System.out.println(photo.getOriginalFilename());
        //取文件类型
        System.out.println(photo.getContentType());
        //获取web服务器的运行目录，因为最终要把文件存储到web服务器上（运行在linux系统上）
        String path= request.getServletContext().getRealPath("/upload/");
        System.out.println(path);
        saveFile(photo,path);
        return "上传成功！";
    }
 
    public void saveFile(MultipartFile photo, String path) throws IOException {
        File dir= new File(path);
        if(!dir.exists()){
            dir.mkdir();
        }
        File file = new File(path+photo.getOriginalFilename());
        photo.transferTo(file);
 
    }
}
 

spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB

spring.web.resources.static-locations=/upload/

package com.example.helloworld.interceptor;
 
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if(!(handler instanceof HandlerMethod)){
            return true;
        }
        System.out.println("LoginInterceptor");
        return true;
    }
}
 

package com.example.helloworld.config;
 
import com.example.helloworld.interceptor.LoginInterceptor;
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 WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/user/**");
    }
}