Spring Boot File Upload Example | Code Factory

2 min readApr 3, 2020

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SpringBootFileUploadApplication.java

package com.codeFactory;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootFileUploadApplication {public static void main(String[] args) {
  SpringApplication.run(SpringBootFileUploadApplication.class, args);
 }}

FileExceptionHandler.java

package com.codeFactory.controller;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;@ControllerAdvice
public class FileExceptionHandler {//Spring 4.3.5 supports RedirectAttributes
 @ExceptionHandler(MultipartException.class)
    public String handleError1(MultipartException e, RedirectAttributes redirectAttributes) {
        redirectAttributes.addFlashAttribute("message", e.getCause().getMessage());
        return "redirect:/uploadStatus";
    }
 
 /* Spring < 4.3.5
 @ExceptionHandler(MultipartException.class)
    public String handleError2(MultipartException e) {
        return "redirect:/errorPage";
    }*/
}

FileUploadController.java

package com.codeFactory.controller;import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;@Controller
public class FileUploadController {private static String UPLOADED_FOLDER = "R://fileUpload//";@GetMapping("/")
 public String index() {
  return "upload";
 }@PostMapping("/upload")
 public String upload(@RequestParam("file") MultipartFile file,
   RedirectAttributes redirectAttributes) {if (file.isEmpty()) {
   redirectAttributes.addFlashAttribute("message", "Please select a file.");
   return "redirect:uploadStatus";
  }try {
   byte[] bytes = file.getBytes();
   Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename());
   Files.write(path, bytes);redirectAttributes.addFlashAttribute("message", "Successfully uploaded file : '" + file.getOriginalFilename() + "'");
  } catch (IOException e) {
   e.printStackTrace();
  }return "redirect:/uploadStatus";
 }@GetMapping("/uploadStatus")
 public String uploadStatus() {
  return "uploadStatus";
 }
}

application.properties

spring.mvc.view.prefix=/
spring.mvc.view.suffix=.jsp#search multipart
spring.http.multipart.max-file-size=1MB
spring.http.multipart.max-request-size=1MB

upload.jsp

<html>
<head>
<title>Insert title here</title>
</head>
<body>
<h1>Spring Boot file upload example</h1><form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file" /><br/><br/>
    <input type="submit" value="Submit" />
</form>
</body>
</html>

uploadStatus.jsp

<!DOCTYPE html>
<html>
<body><h1>File Upload Status</h1><h2>${message}</h2></body>
</html>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.5.RELEASE</version>
  <relativePath /> <!-- lookup parent from repository -->
 </parent>
 <groupId>com.codeFactory</groupId>
 <artifactId>SpringBootFileUpload</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>war</packaging>
 <name>SpringBootFileUpload</name>
 <description>Spring Boot File Upload Example</description><properties>
  <java.version>1.8</java.version>
 </properties><dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-devtools</artifactId>
   <scope>runtime</scope>
   <optional>true</optional>
  </dependency>
  <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
 </dependencies><build>
  <plugins>
   <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
  </plugins>
 </build></project>

Spring Boot File Upload Example | Code Factory

Written by Code Factory