springboot-17-springboot的文件上传和下载
单文件上传
1, 需要使用thymeleaf模板: http://www.cnblogs.com/wenbronk/p/6565834.html
src/main/resource/template/file.html
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> <head> <title>Hello World!</title> </head> <body> <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>
文件上传方法
package com.iwhere.main.controller; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.util.List; import java.util.UUID; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; 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.RestController; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; /** * 文件上传controller * * @RestController 相当于同时 @Controller和@ResponseBody两个注解 * * @author wenbronk * @time 2017年4月6日 下午2:43:03 2017 */ @RestController public class FileUploadController { /** * 文件上传 * * @return */ @RequestMapping(value = "/upload", method = RequestMethod.POST) public String handlFileUpload(@RequestParam("file") MultipartFile file) { if (file.isEmpty()) { return "文件是空的"; } // 读取文件内容并写入 指定目录中 String fileName = file.getOriginalFilename(); // String suffixName = fileName.substring(fileName.lastIndexOf(".")); fileName = UUID.randomUUID() + "|+=|-|" + fileName; File dest = new File("E:/test/" + fileName); // 判断目录是否存在 if (!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); } try { file.transferTo(dest); } catch (IOException e) { return "后台也不知道为什么, 反正就是上传失败了"; } return "上传成功"; } }
多文件上传:
1, thymeleaf
src/main/resource/template/multifile.html
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> <head> <title>Hello World!</title> </head> <body> <form method="POST" enctype="multipart/form-data" action="/batch/upload"> <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>
2, 多文件上传方法
/** * 多文件上传 * 类似单文件上传, 遍历 * @return */ @RequestMapping(value = "multiUpload", method = RequestMethod.POST) public String handleMultiFileupload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file"); for (MultipartFile multipartFile : files) { if (multipartFile.isEmpty()) { return "文件是空的"; } // 读取文件内容并写入 指定目录中 String fileName = multipartFile.getOriginalFilename(); // String suffixName = // fileName.substring(fileName.lastIndexOf(".")); fileName = UUID.randomUUID() + "|+=|-|" + fileName; File dest = new File("E:/test/" + fileName); // 判断目录是否存在 if (!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); } try { multipartFile.transferTo(dest); } catch (IOException e) { return "后台也不知道为什么, 反正就是上传失败了"; } } return "上传成功"; }
文件下载
/** * 文件下载 * * @return */ @RequestMapping("/download") public String downLoadFile(HttpServletRequest request, HttpServletResponse response) { // 文件名可以从request中获取, 这儿为方便, 写死了 String fileName = "rtsch_ex.json"; // String path = request.getServletContext().getRealPath("/"); String path = "E:/test"; File file = new File(path, fileName); if (file.exists()) { // 设置强制下载打开 response.setContentType("application/force-download"); // 文件名乱码, 使用new String() 进行反编码 response.addHeader("Content-Disposition", "attachment;fileName=" + fileName); // 读取文件 BufferedInputStream bi = null; try { byte[] buffer = new byte[1024]; bi = new BufferedInputStream(new FileInputStream(new File(""))); ServletOutputStream outputStream = response.getOutputStream(); int i = -1; while (-1 != (i = bi.read(buffer))) { outputStream.write(buffer, 0, i); } return "下载成功"; } catch (Exception e) { return "程序猿真不知道为什么, 反正就是下载失败了"; } finally { if (bi != null) { try { bi.close(); } catch (IOException e) { e.printStackTrace(); } } } } return "文件不存在"; }
文件下载时, 最容易出现文件名乱码的问题, 这儿使用new String() 进行反编码,
String downname = new String(filename.getBytes("gbk"),"iso8859-1");
当然还有个不太稳的方法:
URLEncoder.encode(fileName, "UTF-8"));
还有一种, 不太奏效
