这个例子实在SpringMVC的基础上完成的，因此在web.xml中需要配置
web.xml
<!-- 配置Spring MVC的入口 DispatcherServlet，把所有的请求都提交到该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
<!-- 为了上传文件引入 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
单个文件上传
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>第一种上传方式</title> </head> <body> <form action="firstUploadController" method="post" enctype="multipart/form-data"> <h2>文件上传</h2> 文件:<input type="file" name="uploadFile"/><br/><br/> <input type="submit" value="上传"/> </form> </body> </html>
enctype="multipart/form-data"
enctype就是encodetype就是编码类型的意思。
multipart/form-data是指表单数据有多部分构成，既有文本数据，又有文件等二进制数据的意思。
需要注意的是：默认情况下，enctype的值是application/x-www-form-urlencoded，不能用于文件上传，只有使用了multipart/form-data，才能完整的传递文件数据。
application/x-www-form-urlencoded不是不能上传文件，是只能上传文本格式的文件，multipart/form-data是将文件以二进制的形式上传，这样可以实现多种类型的文件上传。
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"; } }
多文件上传
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>文件上传</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="上传"/> </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"; } }
和单个文件上传的区别就是用MultipartFile[ ]来接收前端传来的文件，然后循环处理每个文件，每个文件的上传和单个文件的上传一样