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网页上传文件，首先需要了解MIME多媒体类型
http://www.w3school.com.cn/media/media_mimeref.asp
再看web.xml配置，巩固之前的知识
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>webtest</display-name> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/config/applicationContext.xml /WEB-INF/config/codeifAction.xml </param-value> </context-param> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/config/codeifAction.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 拦截所有以do结尾的请求 --> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.do</welcome-file> </welcome-file-list> </web-app>
接着是applicationContext.xml
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" default-lazy-init="true"> <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" /> <!-- 另外最好还要加入DefaultAnnotationHandlerMapping，不然会被 XML或其它的映射覆盖！ --> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" /> <!-- 支持上传文件 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> </beans>
在spring中，文件被包装为multipart类型。
接着是controller
package com.codeif.action; import java.io.File; import java.util.Date; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class UploadAction { @RequestMapping(value = "/upload.do") public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) { System.out.println("开始"); String path = request.getSession().getServletContext().getRealPath("upload");//获取网页根目录的upload目录的绝对路径 String fileName = file.getOriginalFilename(); //从页面上传过来的文件名 // String fileName = new Date().getTime()+".jpg"; System.out.println(path); File targetFile = new File(path, fileName); if(!targetFile.exists()){ targetFile.mkdirs(); } //保存 try { file.transferTo(targetFile); } catch (Exception e) { e.printStackTrace(); } model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName); return "result"; } }
最后是网页表单类型：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>上传图片</title> </head> <body> <form action="upload.do" method="post" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" value="Submit" /></form> </body> </html>
注意这里的enctype="multipart/form-data"
这就是设置请求的mime的，默认为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，进行下面的操作.
这样就完成了文件上传
可用uploadify插件美化上传
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原文地址：http://www.cnblogs.com/guangshan/p/4475599.html
