spring mvc文件上传

最新推荐文章于 2020-02-13 21:40:45 发布

xiaong520jl

最新推荐文章于 2020-02-13 21:40:45 发布

阅读量985

点赞数

分类专栏： JAVA 文章标签： spring mvc

本文链接：https://blog.youkuaiyun.com/xiang520jl/article/details/39054495

版权

JAVA 专栏收录该内容

21 篇文章

订阅专栏

1：导入commons-fileupload-1.3.jar,commons-io-1.3.2.jar 这两个jar包。

2：在Spring.xml文件中添加Bean，如下

<span style="font-family: Arial, Helvetica, sans-serif;">
</span>

<span style="font-family: Arial, Helvetica, sans-serif;"><bean id="multipartResolver"</span>

	class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
	<!-- set the max upload size 5MB -->
	<property name="maxUploadSize" value="5242880" />  <!--In KB -->
	<property name="defaultEncoding" value="UTF-8" />
</bean>

此处限制文件最大为5MB。

3：配置web.xml ，定义mvc-dispatcher处理请求。

<servlet>
	<servlet-name>mvc-dispatcher</servlet-name>
	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	<init-param>
		<param-name>contextConfigLocation</param-name>
		 <param-value>/WEB-INF/cfg/spring/applicationContext.xml</param-value>
	</init-param>
	<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
		<servlet-name>mvc-dispatcher</servlet-name>
		<url-pattern>*.do</url-pattern>
</servlet-mapping>

4：定义控制类。

package com.order.control;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/files")
public class FileUploadController {
	
	@RequestMapping("/showUpload")
	public ModelAndView showUpload(HttpServletRequest request){
		return new ModelAndView("commons/fileupload");
	}
	
	@RequestMapping("/upload")
	public ModelAndView upload(HttpServletRequest request){
		try {
			// 转型为MultipartHttpRequest  
			MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
			
			// 根据前台的name名称得到上传的文件  
			MultipartFile file = multipartRequest.getFile("file"); 
			
			// 获得文件名：  
			String realFileName = file.getOriginalFilename();
			
			// 获取路径
			String separator = System.getProperty("file.separator");
			String ctxPath = request.getSession().getServletContext()
							.getRealPath("/") + separator + "files"+separator;
			
			// 创建文件夹  
			File dirPath = new File(ctxPath);
			
			// 文件夹不存在 新建文件夹
			if (!dirPath.exists()) {
				dirPath.mkdir();
			}
			
			// 创建文件
			File uploadFile = new File(ctxPath + realFileName);
			FileCopyUtils.copy(file.getBytes(), uploadFile);
			
		} catch (IOException e) {
			e.printStackTrace();
		}  
		return new ModelAndView("success");  
	}
}

5.前台JSP页面

<%@ page pageEncoding="utf-8"%>
<%@ include file="../commons/commons.jsp" %>
<!DOCTYPE html>  
<html>  
<head>  
<meta charset="utf-8">  
<title>上传文件</title>  
</head>  
<body>  
<form action="${ROOT_PATH}/files/upload.do" method="post" enctype="multipart/form-data">  
<input type="file" name="file" /> <input type="submit" value="Submit" /></form>  
</body>

注意 form 必需设置method=“post”,enctype="multipart/form-data"

否则会报org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest