Spring Boot实现文件上传示例代码

  <dependencies>    <!-- spring boot web支持 -->    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <!-- thmleaf模板依赖. -->    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-thymeleaf</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-test</artifactId>      <scope>test</scope>    </dependency>  </dependencies>

package com.example.controller;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;/** * 文件上传的Controller *  * @author 单红宇(CSDN CATOOP) * @create 2017年3月11日 */@Controllerpublic class FileUploadController {  // 访问路径为：http://ip:port/upload  @RequestMapping(value = "/upload", method = RequestMethod.GET)  public String upload() {    return "/fileupload";  }  // 访问路径为：http://ip:port/upload/batch  @RequestMapping(value = "/upload/batch", method = RequestMethod.GET)  public String batchUpload() {    return "/mutifileupload";  }  /**   * 文件上传具体实现方法（单文件上传）   *   * @param file   * @return   *    * @author 单红宇(CSDN CATOOP)   * @create 2017年3月11日   */  @RequestMapping(value = "/upload", method = RequestMethod.POST)  @ResponseBody  public String upload(@RequestParam("file") MultipartFile file) {    if (!file.isEmpty()) {      try {        // 这里只是简单例子，文件直接输出到项目路径下。        // 实际项目中，文件需要输出到指定位置，需要在增加代码处理。        // 还有关于文件格式限制、文件大小限制，详见：中配置。        BufferedOutputStream out = new BufferedOutputStream(            new FileOutputStream(new File(file.getOriginalFilename())));        out.write(file.getBytes());        out.flush();        out.close();      } catch (FileNotFoundException e) {        e.printStackTrace();        return "上传失败," + e.getMessage();      } catch (IOException e) {        e.printStackTrace();        return "上传失败," + e.getMessage();      }      return "上传成功";    } else {      return "上传失败，因为文件是空的.";    }  }  /**   * 多文件上传 主要是使用了MultipartHttpServletRequest和MultipartFile   *   * @param request   * @return   *    * @author 单红宇(CSDN CATOOP)   * @create 2017年3月11日   */  @RequestMapping(value = "/upload/batch", method = RequestMethod.POST)  public @ResponseBody String batchUpload(HttpServletRequest request) {    List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");    MultipartFile file = null;    BufferedOutputStream stream = null;    for (int i = 0; i < files.size(); ++i) {      file = files.get(i);      if (!file.isEmpty()) {        try {          byte[] bytes = file.getBytes();          stream = new BufferedOutputStream(new FileOutputStream(new File(file.getOriginalFilename())));          stream.write(bytes);          stream.close();        } catch (Exception e) {          stream = null;          return "You failed to upload " + i + " => " + e.getMessage();        }      } else {        return "You failed to upload " + i + " because the file was empty.";      }    }    return "upload successful";  }}

package com.example.configuration;import javax.servlet.MultipartConfigElement;import org.springframework.boot.web.servlet.MultipartConfigFactory;import org.springframework.context.annotation.Bean;/** * 文件上传配置 *  * @author 单红宇(CSDN CATOOP) * @create 2017年3月11日 */public class FileUploadConfiguration {  @Bean  public MultipartConfigElement multipartConfigElement() {    MultipartConfigFactory factory = new MultipartConfigFactory();    // 设置文件大小限制 ,超出设置页面会抛出异常信息，    // 这样在文件上传的地方就需要进行异常信息的处理了;    factory.setMaxFileSize("256KB"); // KB,MB    /// 设置总上传数据总大小    factory.setMaxRequestSize("512KB");    // Sets the directory location where files will be stored.    // factory.setLocation("路径地址");    return factory.createMultipartConfig();  }}

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

<!DOCTYPE html><html><head><title>文件上传示例</title></head><body>  <h2>文件上传示例</h2>  <hr/>  <form method="POST" enctype="multipart/form-data" action="/upload">    <p>      文件：<input type="file" name="file" />    </p>    <p>      <input type="submit" value="上传" />    </p>  </form></body></html>

<!DOCTYPE html><html><head><title>批量文件上传示例</title></head><body>  <h2>批量文件上传示例</h2>  <hr/>  <form method="POST" enctype="multipart/form-data"    action="/upload/batch">    <p>      文件1：<input type="file" name="file" />    </p>    <p>      文件2：<input type="file" name="file" />    </p>    <p>      文件3：<input type="file" name="file" />    </p>    <p>      <input type="submit" value="上传" />    </p>  </form></body></html>