Spring Boot upload file with form example 2016-04-17 22:29
For most project uploading file is a commonly-used function. In this page I will show you how to upload a file in Spring Boot. It works if you just use SpringMVC in your project. I use jsp as page, so if you don't kow how to use jsp in Spring Boot you can click here for more detail.
Project structure
├─main
│ ├─java
│ │ └─com
│ │ └─henry
│ │ └─upload
│ │ SampleUploadController.java
│ │
│ └─resources
│ │ application.properties
│ │
│ └─META-INF
│ └─resources
│ └─WEB-INF
│ └─jsp
│ upload.jsp
dependencies in pom file
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>8.0.28</version>
</dependency>
</dependencies>
java code
@Controller
@EnableAutoConfiguration
public class SampleUploadController extends SpringBootServletInitializer {
@RequestMapping("/")
public String index() {
return "upload";
}
@RequestMapping("/upload")
@ResponseBody
public String upload(@RequestParam("file") MultipartFile file) {
try {
String content = new String(file.getBytes());
return "file name:" + file.getOriginalFilename() + "<br> content:" + content;
} catch (IOException e) {
e.printStackTrace();
}
return "file name:" + file.getOriginalFilename() +"<br> read file content error.";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleUploadController.class, args);
}
}
application properties file
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
multipart.maxFileSize: 15MB
multipart.maxRequestSize: 15MB
multipart.maxFileSize specifies the maximum size permitted for uploaded files. The default is 1Mb. multipart.maxRequestSize specifies the maximum size allowed for multipart/form-data requests. The default is 10Mb
jps file
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload file</title>
</head>
<body>
<form action="upload" method="POST" enctype="multipart/form-data">
<input type="file" id="file" name="file">
<input type="submit">
</form>
</body>
</html>
Run the main method and visit http://localhost:8080/, click upload button choose the file you want upload then click submit. You will get the file name and content.