Le exemple de Upload file avec Spring Boot et jQuery Ajax

package org.o7planning.sbfileupload;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootFileUploadAjaxApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootFileUploadAjaxApplication.class, args);
    }
    
}

package org.o7planning.sbfileupload.form;

import org.springframework.web.multipart.MultipartFile;

public class UploadForm {

    private String description;

    private MultipartFile[] files;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public MultipartFile[] getFiles() {
        return files;
    }

    public void setFiles(MultipartFile[] files) {
        this.files = files;
    }

}

package org.o7planning.sbfileupload.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class MainController {

    @GetMapping("/")
    public String index() {
        return "upload";
    }

}

package org.o7planning.sbfileupload.restcontroller;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.o7planning.sbfileupload.form.UploadForm;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class MainRESTController {

    // Linux: /home/{user}/test
    // Windows: C:/Users/{user}/test
    private static String UPLOAD_DIR = System.getProperty("user.home") + "/test";

    @PostMapping("/rest/uploadMultiFiles")
    public ResponseEntity<?> multiUploadFileModel(@ModelAttribute UploadForm form) {

        System.out.println("Description:" + form.getDescription());

        String result = null;
        try {

            result = this.saveUploadedFiles(form.getFiles());

        }
        // Here Catch IOException only.
        // Other Exceptions catch by RestGlobalExceptionHandler class.
        catch (IOException e) {
            e.printStackTrace();
            return new ResponseEntity<>("Error: " + e.getMessage(), HttpStatus.BAD_REQUEST);
        }

        return new ResponseEntity<String>("Uploaded to: <br/>" + result, HttpStatus.OK);

    }

    // Save Files
    private String saveUploadedFiles(MultipartFile[] files) throws IOException {

        // Make sure directory exists!
        File uploadDir = new File(UPLOAD_DIR);
        uploadDir.mkdirs();

        StringBuilder sb = new StringBuilder();

        for (MultipartFile file : files) {

            if (file.isEmpty()) {
                continue;
            }
            String uploadFilePath = UPLOAD_DIR + "/" + file.getOriginalFilename();

            byte[] bytes = file.getBytes();
            Path path = Paths.get(uploadFilePath);
            Files.write(path, bytes);

            sb.append(uploadFilePath).append("<br/>");
        }
        return sb.toString();
    }
}

package org.o7planning.sbfileupload.exceptionhandler;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
public class RestGlobalExceptionHandler extends ResponseEntityExceptionHandler {

    // Catch max file size Exception.
    @ExceptionHandler(MultipartException.class)
    @ResponseBody
    public ResponseEntity<?> handleControllerException(HttpServletRequest request, Throwable ex) {

        HttpStatus status = this.getStatus(request);
        return new ResponseEntity<String>("(Message in RestGlobalExceptionHandler *): " + ex.getMessage(), status);
    }

    // Cache Other Exception
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public ResponseEntity<?> handleControllerRootException(HttpServletRequest request, Throwable ex) {

        HttpStatus status = this.getStatus(request);
        return new ResponseEntity<String>("(Message in RestGlobalExceptionHandler **): " + ex.getMessage(), status);
    }

    private HttpStatus getStatus(HttpServletRequest request) {
        Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");
        if (statusCode == null) {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        }
        return HttpStatus.valueOf(statusCode);
    }

}