這個例子實在SpringMVC的基礎上完成的，因此在web.xml中需要配置
web.xml
<!-- 配置Spring MVC的入口 DispatcherServlet，把所有的請求都提交到該Servlet --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
在springmvc-servlet.xml中配置
<!-- 為了上傳文件引入 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
單個文件上傳
firstUpload.jsp
<%@ 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>第一種上傳方式</title> </head> <body> <form action="firstUploadController" method="post" enctype="multipart/form-data"> <h2>文件上傳</h2> 文件:<input type="file" name="uploadFile"/><br/><br/> <input type="submit" value="上傳"/> </form> </body> </html>
enctype="multipart/form-data"
enctype就是encodetype就是編碼類型的意思。
multipart/form-data是指表單數據有多部分構成，既有文本數據，又有文件等二進制數據的意思。
需要注意的是：默認情況下，enctype的值是application/x-www-form-urlencoded，不能用於文件上傳，只有使用了multipart/form-data，才能完整的傳遞文件數據。
application/x-www-form-urlencoded不是不能上傳文件，是只能上傳文本格式的文件，multipart/form-data是將文件以二進制的形式上傳，這樣可以實現多種類型的文件上傳。
FirstUploadController.java
package controller; import java.io.File; import java.io.IOException; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class FirstUploadController { @RequestMapping("firstUploadController") public String doFirst(@RequestParam("uploadFile") MultipartFile uploadFile, HttpSession session) throws IllegalStateException, IOException { String filename = uploadFile.getOriginalFilename(); String leftPath = session.getServletContext().getRealPath("/image"); System.out.println(leftPath); File file = new File(leftPath, filename); uploadFile.transferTo(file); return "index"; } }
多文件上傳
secondUpload.jsp
<%@ 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>Insert title here</title> </head> <body> <form action="secondUploadController" method="post" enctype="multipart/form-data"> <h2>文件上傳</h2> 文件1:<input type="file" name="uploadFile"/><br/><br/> 文件2:<input type="file" name="uploadFile"/><br/><br/> 文件3:<input type="file" name="uploadFile"/><br/><br/> <input type="submit" value="上傳"/> </form> </body> </html>
SecondUplodController.java
package controller; import java.io.File; import java.io.IOException; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class SecondUploadController { @RequestMapping("secondUploadController") public String doFirst(@RequestParam("uploadFile") MultipartFile[] uploadFile, HttpSession session) throws IllegalStateException, IOException { for(MultipartFile item:uploadFile) { if(item.getSize()>0) { String filename = item.getOriginalFilename(); String leftPath = session.getServletContext().getRealPath("/image"); //System.out.println(leftPath); File file = new File(leftPath, filename); item.transferTo(file); } } return "index"; } }
和單個文件上傳的區別就是用MultipartFile[ ]來接收前端傳來的文件，然后循環處理每個文件，每個文件的上傳和單個文件的上傳一樣