java中的文件上傳

[Java] Spring2文件上传实例 [复制链接]

李凯

项目结构视图: web.xml文件内容: <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet>   <servlet-name>spring-action</servlet-name>   <servlet-class>    org.springframework.web.servlet.DispatcherServlet   </servlet-class>   <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping>   <servlet-name>spring-action</servlet-name>   <url-pattern>*.mhtml</url-pattern> </servlet-mapping> <welcome-file-list>   <welcome-file>testuploadfile.jsp</welcome-file> </welcome-file-list> </web-app> 复制代码 spring-action-servlet.xml文件内容: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <!-- 使用Spring已集成的Commons FileUpload上传组件。 1.为了让DispatcherServlet处理MultipartRequest， 在Spring配置文件中声明一个MultipartResolver。 这样一旦某个Request是一个MultipartRequest， 它就会首先被MultipartResolver处理，然后再转发到相应的Controller。 --> <bean id="multipartResolver"   class="org.springframework.web.multipart.commons.CommonsMultipartResolver">   <!-- set the max upload size10MB -->   <property name="maxUploadSize">    <value>10485760</value>   </property> </bean> 复制代码 <!-- 2.配置一个Controller,来处理上传的文件。 --> <bean name="fileUploadController" autowire-candidate="false"   class="test.web.controller.uploadfile.FileUploadController">   <property name="commandClass" value="java.lang.Object" />   <!-- 上传失败时跳转页面 -->   <property name="formView" value="/user/err.jsp" />   <!-- 上传成功时跳转页面 -->   <property name="successView"    value="redirect:/testuploadfile.jsp" />   <property name="uploadDir" value="c:/testUploadFile/" /> </bean> 复制代码 <!-- 3.配置一个URL映射控制器，直接将URL映射到相应的控制器处理。 --> <bean id="urlMapping"   class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">   <property name="mappings">    <props>     <prop key="/testuploadfile.mhtml">      fileUploadController     </prop>    </props>   </property> </bean> 复制代码 <!-- 4.配置一个视图解析器，将逻辑视图名解析为一个用模板文件（如JSP或Velocity模板）渲染的视图对象。 --> <bean id="viewResolver"   class="org.springframework.web.servlet.view.InternalResourceViewResolver">   <property name="requestContextAttribute" value="rc" />   <property name="viewClass"    value="org.springframework.web.servlet.view.JstlView" />   <property name="prefix" value="" />   <property name="suffix" value=".jsp" /> </bean> </beans> 复制代码 FileUploadController.java文件内容: package test.web.controller.uploadfile; import java.io.File; import java.util.Iterator; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.validation.BindException; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.SimpleFormController; public class FileUploadController extends SimpleFormController { private String uploadDir;//上传文件路径 public void setUploadDir(String uploadDir) {   this.uploadDir = uploadDir; } public String getUploadDir() {   return this.uploadDir; } protected ModelAndView onSubmit(HttpServletRequest request,    HttpServletResponse response, Object cmd, BindException errors)    throws Exception {   uploadFile(request);   return new ModelAndView(getSuccessView()); } private void uploadFile(HttpServletRequest request) {   // 转型为MultipartHttpRequest：   MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;   // 遍历所有文件域，获得上传的文件   for (Iterator it = multipartRequest.getFileNames(); it.hasNext();) {    String key = (String) it.next();    MultipartFile file = multipartRequest.getFile(key);    saveFile(file);   } } private void saveFile(MultipartFile file) {   if (file == null || file.isEmpty())    return;   String filename = file.getOriginalFilename();   String localfileName = uploadDir + filename;   // 写入文件   File source = new File(localfileName.toString());   try {    file.transferTo(source);   } catch (Exception e) {    e.printStackTrace();   } } } 复制代码 testuploadfile.jsp文件内容: <%@ page language="java" contentType="text/html; charset=UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head>   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">   <title>Insert title here</title>   <style>    .addAttachFileUrl{     position: relative;     font-size: 12px;    }    .file {     position: absolute;     width: 1px;     left: -3px;     filter: Alpha(opacity=0);     cursor: hand;     top: -3px;    }    .filelistItem {     display: block;     background: #ffffcc;     font: "宋体";     font-size: 12px;    }   </style>   <script type="text/javascript">     var i=1;     //文件上传     var attachname = "attach_";     function addFile(obj){      if(obj.value.length>0){       var fileNewInput = document.createElement("<input type='file' name='"+       attachname + i + "' class='file' onchange='addFile(this)'/>");       var fileName = document.createElement("span");       fileName.className = "filelistItem";       fileName.innerHTML = obj.value+       "  <a href='javascript:void(0)' onclick='delFile(this)'>删除</a>";       fileName.appendChild(obj);       document.getElementById("filelist").appendChild(fileName);       document.getElementById("filebutton").appendChild(fileNewInput)       obj.style.display="none";       i = i + 1;      }     }     function delFile(obj){      document.getElementById("filelist").removeChild(obj.parentNode)     }      </script> </head> <body>   <FORM id="myForm" method="POST" enctype="multipart/form-data"   action="testuploadfile.mhtml">    上传附件: <div id="filelist"></div>    <br />    <a class="addAttachFileUrl" href="javascript:void(0)" id="filebutton">点击添加附件     <input type="file" name="file_0" class="file"      onchange="addFile(this)" /> </a>    <br />    <input type="submit" value="提交">   </FORM> </body> </html> 复制代码