利用spring的MultipartFile实现文件上传原
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利用spring的MultipartFile实现文件上传
主要依赖jar包
spring-web-3.0.6.RELEASE.jar 用到 (org.springframework.web.multipart.MultipartFile)
commons-fileupload-1.3.1.jar
commons-logging-1.0.4.jar
前台
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>上传</title> <style type="text/css"> </style> </head> <body> <form enctype="multipart/form-data" action="/kingtool/file/upload.do" method="POST"> file: <input type="file" name="file" /> <input type="submit" value="提交" /> </form> </body> </html>
后台
package com.bobo.code.web.controller; import java.io.File; import java.io.IOException; import java.math.BigDecimal; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; 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.multipart.MultipartFile; @Controller @RequestMapping({ "file/*" }) public class LoginController { /** * 承保文件上传 * * @param session */ @RequestMapping(value = "upload.do", method = { RequestMethod.POST, RequestMethod.GET }) public void fileUpload(HttpSession session, ModelMap modelMap, HttpServletResponse response, HttpServletRequest request, @RequestParam("file") MultipartFile file) throws Exception, IOException { String ret = ""; request.setCharacterEncoding("UTF-8");// 编码格式处理 // 获取文件名 String fileName = file.getOriginalFilename(); System.out.println("fileName:------------------------------------------------------" + fileName); // 获取文件大小kb BigDecimal fileSize = new BigDecimal(file.getSize()).divide(new BigDecimal(1024), 2, BigDecimal.ROUND_HALF_UP); String startFileName = fileName.substring(0, fileName.indexOf(".")); String endFileName = fileName.substring(fileName.lastIndexOf(".")); // 新文件名称 String newFileName = startFileName + "_" + Math.random() + endFileName; // 文件保存路径 String parentPath = request.getSession().getServletContext().getRealPath("/") + "upload/"; String filePath = parentPath + newFileName; System.out.println("filePath:-----------------------------------------------------------" + filePath); System.out.println("System.setProperty(‘sun.jnu.encoding‘) --------" + System.getProperty("sun.jnu.encoding")); System.setProperty("sun.jnu.encoding", "utf-8"); System.out.println("System.setProperty(‘sun.jnu.encoding‘) --------" + System.getProperty("sun.jnu.encoding")); File newFile = new File(parentPath); if (!newFile.exists()) {// 判断文件夹是否创建，没有创建则创建新文件夹 newFile.mkdirs(); } boolean uploadFile = true; // 比较上传文件大小是否超过10M if (fileSize.compareTo(new BigDecimal(1024 * 10)) > 0) { uploadFile = false; ret = "上传文件的大小不能超过10Mb,请重新选择!"; } if (uploadFile) { try { file.transferTo(new File(filePath));// 转存文件 ret = "上传成功!"; } catch (Exception e) { ret = "上传失败!"; } } try { response.setContentType("text/html;charset=UTF-8"); response.getWriter().write(ret); response.getWriter().flush(); } catch (IOException e) { e.printStackTrace(); } } }
spring bean配置
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- maxUploadSize:文件上传的最大值以byte为单位 --> <property name="maxUploadSize" value="1024000"></property> <property name="defaultEncoding" value="GBK"></property> </bean>
如果不配置,可能报如下错org.springframework.web.bind.MissingServletRequestParameterException: Required MultipartFile parameter ‘file‘ is not present
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