?

?spring mvc(注解)上傳文件的簡單例子,這有幾個需要注意的地方
1.form的enctype=”multipart/form-data” 這個是上傳文件必須的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 關于文件上傳的配置不能少

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大家可以看具體代碼如下:

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web.xml

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<?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>??

????<!--?攔截所有以do結尾的請求?-->??

????<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>??

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applicationContext.xml

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<?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">??

??

????<!--?啟動Spring?MVC的注解功能，完成請求和注解POJO的映射?-->??

????<bean?class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"?lazy-init="false"?/>??

??

????<!--?另外最好還要加入DefaultAnnotationHandlerMapping，不然會被?XML或其它的映射覆蓋！?-->??

????<bean?class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"?/>??

??

????<!--?對模型視圖名稱的解析，即在模型視圖名稱添加前后綴?-->??

????<bean?class="org.springframework.web.servlet.view.InternalResourceViewResolver"?p:prefix="/WEB-INF/jsp/"?p:suffix=".jsp"?/>??

??

????<!--?支持上傳文件?-->??

????<bean?id="multipartResolver"?class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>??

??

</beans>??

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codeifAction.xml

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<?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>??

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?

UploadAction.java

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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("開始");??

????????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";??

????}??

??

}??

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index.jsp

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<%@?page?pageEncoding="utf-8"%>??

<!DOCTYPE?html>??

<html>??

<head>??

<meta?charset="utf-8">??

<title>上傳圖片</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

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<%@?page?pageEncoding="utf-8"%>??

<!DOCTYPE?html>??

<html>??

<head>??

<meta?charset="utf-8">??

<title>上傳結果</title>??

</head>??

<body>??

<img?alt=""?src="${fileUrl?}"?/>??

</body>??

</html>??

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