额外加入的依赖
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency>
上传
上传页面：注意上传域的name属性要和controller参数名一致，enctype属性
<form method="POST" enctype="multipart/form-data" action="fileUpLoad.action"> <p> 文件：<input type="file" name="file" /> </p> <p> <input type="submit" value="上传" /> </p> </form>
上传参数控制
package com.example.demo.config; import javax.servlet.MultipartConfigElement; import org.springframework.boot.web.servlet.MultipartConfigFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * 配置上传 * @author 柴火 * */ @Configuration public class FileUpLoadConfig { @Bean public MultipartConfigElement multipartConfigElement() { MultipartConfigFactory factory = new MultipartConfigFactory(); 设置文件大小限制,超了，页面会抛出异常信息，这时候就需要进行异常信息的处理了; factory.setMaxFileSize("128KB"); // KB,MB /// 设置总上传数据总大小 factory.setMaxRequestSize("256KB"); // Sets the directory location where files will be stored. 设置上传路径 //factory.setLocation("路径地址"); return factory.createMultipartConfig(); } }
controller代码（2种上传方式）
package com.example.demo.controller; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; @Controller public class UpLoadController { @RequestMapping("/fileUpLoad.action") @ResponseBody public String upLoadFile(MultipartFile file) throws IllegalStateException, IOException { BufferedOutputStream stream = null; if (!file.isEmpty()) { String path = "E:/stsWorkSpace/SpringBoot_Test/src/main/resources/upload"; File newFile=new File(path+"/"+file.getOriginalFilename()); if(!newFile.exists()){ newFile.createNewFile(); } BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(newFile)); out.write(file.getBytes()); out.flush(); out.close(); return "上传成功"; } return "上传失败"; } }
package com.example.demo.controller; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; @Controller public class UpLoadController { @RequestMapping("/fileUpLoad.action") @ResponseBody public String upLoadFile(MultipartFile file) throws IllegalStateException, IOException { BufferedOutputStream stream = null; if (!file.isEmpty()) { // 打印文件的名称 System.out.println("FileName:" + file.getOriginalFilename()); // 确定上传文件的位置 String path = "E:/stsWorkSpace/SpringBoot_Test/src/main/resources/upload"; File newFile = new File(path, file.getOriginalFilename()); //如果不存在，创建一哥副本 if (!newFile.exists()) { newFile.createNewFile(); } //将io上传到副本中 file.transferTo(newFile); return "上传成功"; } return "上传失败"; } }
下载
package com.example.demo.controller; import java.io.File; import org.apache.commons.io.FileUtils; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class DownLoadController { @RequestMapping("/fileDownLoad.action") public ResponseEntity<byte[]> textFileDownload() throws Exception { String path = "E:/WorkSpace1/SpringMVC_001/WebContent/WEB-INF/fileupload/1.jpg"; File file = new File(path); HttpHeaders headers = new HttpHeaders(); // String fileName=new // String("你好.xlsx".getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题 String fileName = new String(file.getName().getBytes("UTF-8"), "iso-8859-1");// 为了解决中文名称乱码问题 headers.setContentDispositionFormData("attachment", fileName); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED); } }
