spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方 1.form的enctype=”multipart/form-data” 这个是上传文件必须的 2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少
大家可以看具体代码如下:
web.xml
[html] view plain copy print ? <?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>
applicationContext.xml
[html] view plain copy print ? <?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>
codeifAction.xml
[html] view plain copy print ? <?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" 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"> <bean id="uploadAction" class="com.codeif.action.UploadAction" /> </beans>
UploadAction.java
[java] view plain copy print ? 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"); String fileName = file.getOriginalFilename(); // 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"; } }
index.jsp
[html] view plain copy print ? <%@ page pageEncoding="utf-8"%> <!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>
WEB-INF/jsp/下的result.jsp
[html] view plain copy print ? <%@ page pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>上传结果</title> </head> <body> <img alt="" src="${fileUrl }" /> </body> </html>