springMVC默認(rèn)的解析器里面是沒(méi)有加入對(duì)文件上傳的解析的,，使用springmvc對(duì)文件上傳的解析器來(lái)處理文件上傳的時(shí)需要用springmvc提供的MultipartResolver的申明，又因?yàn)镃ommonsMultipartResolver實(shí)現(xiàn)了MultipartResolver接口，所以我們可以在springmvc配置文件中這樣配置：
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="utf-8" /> <property name="maxUploadSize" value="10485760000" /> <property name="maxInMemorySize" value="40960" /> </bean>
首先引入文件上傳所需要的包,commons-logging-*.jar commons-io-*.jar commons-fileupload-*.jar
新建一個(gè)JSP頁(yè)面.
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>文件上傳</title> </head> <body> <%--<form action="user/fileUpload" method="post" enctype="multipart/form-data">--%> <form action="user/fileUpload" method="post" enctype="multipart/form-data"> <input type="file" name="fileUpload" /> <input type="submit" value="上傳" /> </form> </body> </html>
springmvc上傳文件的形式有很多,這里我介紹兩種.
第一種,看Controller
package gd.hz.springmvc.controller; import java.io.File; import java.io.IOException; 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.multipart.commons.CommonsMultipartFile; import org.springframework.web.servlet.ModelAndView; @Controller("userController") @RequestMapping("user") public class UserController { // 處理文件上傳一 @RequestMapping(value = "fileUpload", method = RequestMethod.POST) public ModelAndView fileUpload( @RequestParam("fileUpload") CommonsMultipartFile file) { // 獲取文件類型 System.out.println(file.getContentType()); // 獲取文件大小 System.out.println(file.getSize()); // 獲取文件名稱 System.out.println(file.getOriginalFilename()); // 判斷文件是否存在 if (!file.isEmpty()) { String path = "D:/" + file.getOriginalFilename(); File localFile = new File(path); try { file.transferTo(localFile); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return new ModelAndView("dataSuccess"); } } 類CommonsMultipartFile為我們提供了許多對(duì)文件處理的方法.例如文件大小,上傳文件名稱,文件類型,具體用法可以查看spring的文檔.transferTo就是將文件輸出到指定地方.
文件上傳的第二種方法,這種方法比較常用:
package gd.hz.springmvc.controller; import java.io.File; import java.io.IOException; import java.util.Iterator; 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.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.multipart.commons.CommonsMultipartResolver; @Controller("userController") @RequestMapping("user") public class UserController { // 處理文件上傳二 @RequestMapping(value = "fileUpload2", method = RequestMethod.POST) public String fileUpload2(HttpServletRequest request) throws IllegalStateException, IOException { // 設(shè)置上下方文 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver( request.getSession().getServletContext()); // 檢查form是否有enctype="multipart/form-data" if (multipartResolver.isMultipart(request)) { MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request; Iterator<String> iter = multiRequest.getFileNames(); while (iter.hasNext()) { // 由CommonsMultipartFile繼承而來(lái),擁有上面的方法. MultipartFile file = multiRequest.getFile(iter.next()); if (file != null) { String fileName = "demoUpload" + file.getOriginalFilename(); String path = "D:/" + fileName; File localFile = new File(path); file.transferTo(localFile); } } } return "dataSuccess"; } } MultipartHttpServletRequest提供了更加靈活的方法,可以獲取多個(gè)文件和文件名,可以遍歷獲得每個(gè)文件.
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