Spring MVC 文件上传
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
3.需要commons.fileupload和commons.io的jar包
Spring的配置文件
<!-- SpringMVC上传文件时,需要配置MultipartResolver处理器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"/> <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件,而是所有文件的容量之和 --> <property name="maxUploadSize" value="200000"/> </bean> <!-- SpringMVC在超出上传文件限制时,会抛出org.springframework.web.multipart.MaxUploadSizeExceededException --> <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的,而且此时还没有进入到Controller方法中 --> <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <!-- 遇到MaxUploadSizeExceededException异常时,自动跳转到/WEB-INF/ftl/common/error_fileupload.ftl页面 --> <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">/common/error_fileupload</prop> </props> </property> </bean>
Controller
package com.zyz.action; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.util.Date; /** * Created by zyz on 2016-8-26. */ @Controller public class UploadAction { @RequestMapping(value = "/uploadform",method = RequestMethod.GET) public String uploadForm(){ return "uploadForm"; } @RequestMapping(value = "/upload",method = RequestMethod.POST) 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 "uploadResult"; } }