Beispiel Upload file mit Spring Boot

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1- Die Erstellung des Projekt Spring Boot

OK. Project has been created.
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>

    <groupId>org.o7planning</groupId>
    <artifactId>SpringBootFileUpload</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringBootFileUpload</name>
    <description>Spring Boot + File Upload Example</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>
 
SpringBootFileUploadApplication.java
package org.o7planning.sbfileupload;

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);
    }
}
 

2- Die Größe der File konfigurieren

Spring Boot hat die notwendigen Bibliotheke konfigurieren damit sie die Funktion des Hochladen der File (upload) bauen können. Die hochladende File auf Server begrenzt nach dem Standard kleiner als (<) 128KB, deshalb brauchen Sie konfigurieren um die Wert des Parameter zu ändern. Die folgenden Properties nach der File  application.properties ​​​​​​​einfügen.
application.properties
spring.servlet.multipart.max-file-size=5MB
spring.servlet.multipart.max-request-size=5MB
Die größte Kapazität der File kann 5GB sein

3- Form & Controller

MyUploadForm.java
package org.o7planning.sbfileupload.form;

import org.springframework.web.multipart.MultipartFile;

public class MyUploadForm {

    private String description;

    // Upload files.
    private MultipartFile[] fileDatas;

    public String getDescription() {
        return description;
    }

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

    public MultipartFile[] getFileDatas() {
        return fileDatas;
    }

    public void setFileDatas(MultipartFile[] fileDatas) {
        this.fileDatas = fileDatas;
    }

}
MyFileUploadController.java
package org.o7planning.sbfileupload.controller;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.o7planning.sbfileupload.form.MyUploadForm;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class MyFileUploadController {

   @RequestMapping(value = "/")
   public String homePage() {

      return "index";
   }

   // GET: Show upload form page.
   @RequestMapping(value = "/uploadOneFile", method = RequestMethod.GET)
   public String uploadOneFileHandler(Model model) {

      MyUploadForm myUploadForm = new MyUploadForm();
      model.addAttribute("myUploadForm", myUploadForm);

      return "uploadOneFile";
   }

   // POST: Do Upload
   @RequestMapping(value = "/uploadOneFile", method = RequestMethod.POST)
   public String uploadOneFileHandlerPOST(HttpServletRequest request, //
         Model model, //
         @ModelAttribute("myUploadForm") MyUploadForm myUploadForm) {

      return this.doUpload(request, model, myUploadForm);

   }

   // GET: Show upload form page.
   @RequestMapping(value = "/uploadMultiFile", method = RequestMethod.GET)
   public String uploadMultiFileHandler(Model model) {

      MyUploadForm myUploadForm = new MyUploadForm();
      model.addAttribute("myUploadForm", myUploadForm);

      return "uploadMultiFile";
   }

   // POST: Do Upload
   @RequestMapping(value = "/uploadMultiFile", method = RequestMethod.POST)
   public String uploadMultiFileHandlerPOST(HttpServletRequest request, //
         Model model, //
         @ModelAttribute("myUploadForm") MyUploadForm myUploadForm) {

      return this.doUpload(request, model, myUploadForm);

   }

   private String doUpload(HttpServletRequest request, Model model, //
         MyUploadForm myUploadForm) {

      String description = myUploadForm.getDescription();
      System.out.println("Description: " + description);

      // Root Directory.
      String uploadRootPath = request.getServletContext().getRealPath("upload");
      System.out.println("uploadRootPath=" + uploadRootPath);

      File uploadRootDir = new File(uploadRootPath);
      // Create directory if it not exists.
      if (!uploadRootDir.exists()) {
         uploadRootDir.mkdirs();
      }
      MultipartFile[] fileDatas = myUploadForm.getFileDatas();
      //
      List<File> uploadedFiles = new ArrayList<File>();
      List<String> failedFiles = new ArrayList<String>();

      for (MultipartFile fileData : fileDatas) {

         // Client File Name
         String name = fileData.getOriginalFilename();
         System.out.println("Client File Name = " + name);

         if (name != null && name.length() > 0) {
            try {
               // Create the file at server
               File serverFile = new File(uploadRootDir.getAbsolutePath() + File.separator + name);

               BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(serverFile));
               stream.write(fileData.getBytes());
               stream.close();
               //
               uploadedFiles.add(serverFile);
               System.out.println("Write file: " + serverFile);
            } catch (Exception e) {
               System.out.println("Error Write file: " + name);
               failedFiles.add(name);
            }
         }
      }
      model.addAttribute("description", description);
      model.addAttribute("uploadedFiles", uploadedFiles);
      model.addAttribute("failedFiles", failedFiles);
      return "uploadResult";
   }

}

4- Thymeleaf Templates

_menu.html
<div  xmlns:th="http://www.thymeleaf.org"
   style="border:1px solid #ccc;padding:5px;">
 
   <a th:href="@{/uploadOneFile}">Upload One File</a>
   
   &nbsp;|&nbsp;
   
   <a th:href="@{/uploadMultiFile}">Upload Multi File</a>
   
   
 </div>
index.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

   <head>
      <meta charset="UTF-8">
      <title>Spring Boot File Upload Example</title>
   </head>
   
   <body>
      <th:block th:include="/_menu"></th:block>
      
      <h3>Spring Boot File Upload Example</h3>
      
      <ul>
        <li><a th:href="@{/uploadOneFile}">Upload One File Example</a></li>
        <li><a th:href="@{/uploadMultiFile}">Upload Multiple Files Example</a></li>
      </ul>
      
   </body>
</html>
uploadOneFile.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

   <head>
      <meta charset="UTF-8">
      <title>Upload One File</title>
   </head>
  
   <body>
      <th:block th:include="/_menu"></th:block>
      
      <h3>Upload One File:</h3>
      
      <!-- MyUploadForm -->
      
      <form th:object="${myUploadForm}" method="POST"
         action="" enctype="multipart/form-data">
         Description:
         <br>
         <input th:field="*{description}" style="width:300px;"/>                
         <br/><br/>  
         File to upload: <input th:field="*{fileDatas}" type="file"/>
         <br />  
         <input type="submit" value="Upload">
      </form>
      
   </body>
</html>
uploadMultiFile.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

   <head>
      <meta charset="UTF-8">
      <title>Upload Multi File</title>
   </head>
   
   <body>
      <th:block th:include="/_menu"></th:block>
      <h3>Upload Multiple File:</h3>
      
      <!-- MyUploadForm -->
      <form th:object="${myUploadForm}" method="POST"
         action="" enctype="multipart/form-data">
         Description:
         <br>
         <input th:field="*{description}" style="width:300px;"/>                
         <br/><br/>                 
         File to upload (1): <input th:field="*{fileDatas}" type="file"/><br />      
         File to upload (2): <input th:field="*{fileDatas}" type="file"/><br />    
         File to upload (3): <input th:field="*{fileDatas}" type="file"/><br />    
         File to upload (4): <input th:field="*{fileDatas}" type="file"/><br />    
         File to upload (5): <input th:field="*{fileDatas}" type="file"/><br />    
         <input type="submit" value="Upload">
      </form>
      
   </body>
</html>
uploadResult.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="UTF-8">
      <title>Upload Result</title>
   </head>
   
   <body>
      <th:block th:include="/_menu"></th:block>
      
      Description: <span th:utext="${description}"></span>
      <br/>
      <h3>Uploaded Files:</h3>
      
      <ul th:each="file : ${uploadedFiles}">
         <li th:utext="${file}"></li>  
      </ul>      
      
      <h3>Failed:</h3>
      <ul th:each="file : ${failedFiles}">
         <li style="color:red;" th:utext="${file}"></li>  
      </ul>
      
   </body>
   
</html>

5- Die Applikation laufen

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