梦神十夜的小站

application.yml

spring:
  #Spring Boot 1.4.x或者之后
  http:
    multipart:
      maxFileSize: 100Mb
      maxRequestSize: 1000Mb

FileController.java

package com.daimeng.web.file.action;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
@Controller
@RequestMapping("/mp")
public class FileController {
    
    private static String UPLOADED_FOLDER = "D:/java_test/";
    @GetMapping("/pg")
    public String pg(Model model) {
        return "mapping/upload";
    }
    
    @GetMapping("/us")
    public String us(Model model,RedirectAttributes redirectAttributes) {
        return "mapping/us";
    }
    
    @PostMapping("/up")
    //@ResponseBody
    public String up(@RequestParam("file") MultipartFile file,
            RedirectAttributes redirectAttributes) {
        if (file.isEmpty()) {
            redirectAttributes.addFlashAttribute("message", "请选择一个文件进行上传！");
            return "redirect:/mp/up";
        }
        try {
            // Get the file and save it somewhere
            byte[] bytes = file.getBytes();
            Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename());
            Files.write(path, bytes);
            redirectAttributes.addFlashAttribute("message",
                    "成功上传文件：'" + file.getOriginalFilename() + "'");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "redirect:/mp/us";
    }
    
}

GlobalExceptonHandler.java

package com.daimeng.interceptor;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
/**
* 设置一个@ControllerAdvice用来监控Multipart上传的文件大小是否受限，当出现此异常时在前端页面给出提示。
* 利用@ControllerAdvice可以做很多东西，比如全局的统一异常处理等
* @author daimeng
*
*/
@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(MultipartException.class)
    public String handleError1(MultipartException e, RedirectAttributes redirectAttributes) {
        redirectAttributes.addFlashAttribute("message", e.getCause().getMessage());
        return "redirect:/file/uploadStatus";
    }
}

up.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<body>
<h1>Spring Boot - 文件上传</h1>
<form method="POST" action="/file/upload"  enctype="multipart/form-data">
    <input type="file" name="file" /><br/><br/>
    <input type="submit" value="Submit" />
</form>
</body>
</html>

us.html

<div th:if="${message}">
    <h2 th:text="${message}"/>
</div>