Springmvc文件上传

目录

• Springmvc文件上传
  • 依赖的jar包
  • web.xml相关配置
  • springmvc核心配置文件
  • 单文件上传
    • controller层Java代码
    • 相关jsp代码:upload.jsp
  • 多文件批量上传
    • controller层Java代码
    • 相关jsp代码:batchUpload.jsp
    • index.jsp
  • 项目结构

Springmvc文件上传

依赖的jar包

commons-io
commons-upload

Spring 核心依赖包：bean context aop context core web webmvc expression

web.xml相关配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
	<display-name>springmvc_upload</display-name>
	<filter>
		<filter-name>characterencoding</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>characterencoding</filter-name>
		<url-pattern>*.do</url-pattern>
	</filter-mapping>
	<servlet>
		<servlet-name>upload</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:mvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>upload</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
</web-app>

注意点：

• springmvc的核心配置文件一定在DispatcherServlet处配置其具体位置，而不是
• 映射的虚拟路径可以是"/"、"/"、".do"等，但是不要写成"/*.do"

springmvc核心配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
	<!-- 开启mvc的注解 -->
	<mvc:annotation-driven />
	<!-- 扫描包 -->
	<context:component-scan base-package="com.zrm.controller"></context:component-scan>
	<!-- 配置视图解析器 -->
	<bean id="InternalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	<!-- 配置文件解析器 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="utf-8"></property>
		<property name="maxUploadSize" value="10240000"></property>
		<property name="maxInMemorySize" value="4096000"></property>
	</bean>
</beans>

注意点：

• 上传的文件大小不得超过文件解析器中maxUploadSize设置的大小，否则会报错
• 若是在web.xml的url-pattern中设置如/拦截了静态资源，可在此处添加类似<mvc:resources location="/" mapping="//.js"></mvc:resources>这样的设置来放行静态资源，最好把静态资源放置在wencontent下而非WEB-INF(访问权限受限)

单文件上传

controller层Java代码

@Controller
public class UploadCtrl {
	@RequestMapping("/toUpload.do")
	public String toUpload() {
		return "upload";
	}
	@RequestMapping("/upload.do")
	public ModelAndView upload(HttpServletRequest req,@RequestParam("file")CommonsMultipartFile file) {
		String path = req.getServletContext().getRealPath("/upload");
		String name = file.getOriginalFilename();
		System.out.println("文件名："+name);
		InputStream is = null;
		OutputStream os = null;
		try {
			is = file.getInputStream();
			os = new FileOutputStream(new File(path,name));
			byte[] bytes = new byte[1024];
			int len =0;
			while((len=is.read(bytes))!=-1) {
				os.write(bytes,0,len);
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				if(is!=null)
					is.close();
				if(os!=null)
					os.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		   return new ModelAndView("index");
	}

注意点：

• CommonsMultipartFile file处必须使用注解@RequestParam("file")为其注入请求中的file属性值，否则CommonsMultipartFile会自己去尝试初始化file，从而报错（找不到CommonsMultipartFile的file值）
• 通过 "String path = req.getServletContext().getRealPath("/upload");" 将"/upload"这个虚拟路径映射为webcontent下的真实路径。

相关jsp代码:upload.jsp

<body>
    <form action="upload.do" method="post" enctype="multipart/form-data">
    	file:<input type="file" name="file"/><input type="submit" value="上传"/>
    </form>
 </body>

多文件批量上传

controller层Java代码

@RequestMapping("/toBatchUpload.do")
	public String toBatchUpload() {
		return "batchUpload";
	}
	@RequestMapping("/batchUpload.do")
	public ModelAndView batchUpload(HttpServletRequest req,@RequestParam("file")CommonsMultipartFile[] file) {
		String path = req.getServletContext().getRealPath("/upload");
		String name = null;
		InputStream is = null;
		OutputStream os = null;
			byte[] bytes = new byte[1024];
			int len =0;
			for (int i = 0; i < file.length; i++) {
				try {
					name = file[i].getOriginalFilename();
					is = file[i].getInputStream();
					System.out.println("文件名："+name);
					os = new FileOutputStream(new File(path,name));
					while((len=is.read(bytes))!=-1) {
						os.write(bytes,0,len);
					}
				} catch (FileNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally {
					try {
						if(is!=null)
							is.close();
						if(os!=null)
							os.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
			return new ModelAndView("index");
	}

通过for循环，重复执行单文件上传代码

相关jsp代码:batchUpload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Home Page</title>
    <script src="${pageContext.request.contextPath }/js/jquery-2.1.0.min.js" type="text/javascript"></script>
</head>
<body>
    <form action="batchUpload.do" method="post"  >
    	file:<input type="file" name="file"/>
    	<input id="add" type="button" value="添加">
    	<input type="submit" value="上传"/>
    	<div id="fileList"></div>
    </form>
 </body>
 <script type="text/javascript">
	 $("#add").click(function(){
	 		var field = "<p>选择文件：<input type='file' name='file'/><input type='button' value='删除 '  onclick='del(this);' /></p>";
	 		$("#fileList").append(field);
	 	});
	 function del(obj){
		 $(obj).parent().remove();
	 };
 </script>
</html>

index.jsp

<body>
上传成功
</body>

注意点：

• jquery的基本语法就是以function，所以del()函数需要单独定义，而不能将其嵌套在$().ready里面。总结起来就是，使用时可嵌套，但是定义时不可嵌套
• enctype="multipart/form-data"上传的文件类型不能忘了

项目结构

项目源码已上传至 github fileupload