序言:
该案例是采用springMvc实现跨服务器图片上传功能,其中用到的主要类和工具有:CommonsMultipartResolver、jquery.form.js。如果要实现多个文件上传,只需要在input元素中加入multiple="multiple",即可选择多个文件进行上传。另外本文的上传的文件路径不是在tomcat下对应的文件夹中,而是在workspace对应的文件夹中存在。该案例使用ajax上传页面不刷新,多个图片可立即回显,并将其相对路径可以随着表单一起保存到数据库中,而文件则存放在文件服务器中。还有,点击选择,选择了文件之后,文件是依附于form表单,因此在使用jquery.form.js的$("#formId").ajaxSubmit(options)提交的表单,提交之后,文件是以流的形式通过HttpServeltRequest传递到Controller当中,之后再通过向下强转成HttpServeltRequest的实现接口MultipartHttpServletRequest进一步获取到文件集合。
代码:
springMvc-servlet.xml文件中需要配置:
<!-- 文件上传解析器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="20180000"></property> </bean>
jsp页面:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery.js"></script> <script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery.form.js"></script> <script type="text/javascript"> function fileOnchage(){ var option = { type:"post", data:{myUploadFile:'uploadFile'}, dataType:"string", url:"${pageContext.request.contextPath }/uploadController/upload.do", success:function(data){ //String格式json,转json对象 var json = $.parseJSON(data); //将对象转String格式的json(例如数组) //JSON.stringify('obj'); for(var i in json){ $("#picImg").append('<img id="myImg" src="'+json[i].fullPath+'"/>'); } } } $("#fileForm").ajaxSubmit(option); } </script> </head> <body> <form id="fileForm" method="post"> <div id="picImg"></div> <input type="file" name="uploadFile" value="请选择" multiple="multiple" onchange="fileOnchage()"/> <input type="hidden" id="relativePath" value=""> </form> </body> </html>
controller:
package com.cissst.it; import java.io.IOException; import java.io.InputStream; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Random; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import net.sf.json.JSONArray; import org.springframework.stereotype.Controller; import org.springframework.web.bind.ServletRequestDataBinder; import org.springframework.web.bind.annotation.InitBinder; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.multipart.commons.CommonsMultipartFile; import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor; import com.sun.jersey.api.client.Client; import com.sun.jersey.api.client.WebResource; @Controller @RequestMapping("/uploadController") public class UploadController { @InitBinder protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws ServletException { binder.registerCustomEditor(CommonsMultipartFile.class, new ByteArrayMultipartFileEditor()); } @RequestMapping("upload") @ResponseBody public String upload(String myUploadFile,HttpServletRequest request){ //多部件请求对象 MultipartHttpServletRequest mh = (MultipartHttpServletRequest) request; //获取文件list集合 List<MultipartFile> files = mh.getFiles(myUploadFile); //创建jersey服务器,进行跨服务器上传 Client client = Client.create(); //json格式的图片路径 List<String> listJsonPath = new ArrayList<String>(); for (MultipartFile file : files) { String newFileName=""; SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); newFileName = sdf.format(new Date()); Random r = new Random(); //{'':''} String jsonPath=""; for(int i =0 ;i<3;i++){ newFileName=newFileName+r.nextInt(10); } //原始的文件名 String originalFilename = file.getOriginalFilename(); //截取文件扩展名 String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); //绝对路径(另一台服务器文件路径) String fullPath="http://127.0.0.1:8083/springMvc_fileServler/upload/"+newFileName+suffix; //相对路径(数据库中存放的文件名) String relativePath=newFileName+suffix; //各自的流 InputStream inputStream = null; try { inputStream = file.getInputStream(); } catch (IOException e1) { e1.printStackTrace(); } //将文件传入文件服务器 WebResource resource = client.resource(fullPath); resource.put(String.class, inputStream); jsonPath = "{\"fullPath\":\""+fullPath+"\",\"relativePath\":\""+relativePath+"\"}"; listJsonPath.add(jsonPath); } JSONArray jsonArray = JSONArray.fromObject(listJsonPath); return jsonArray.toString(); } }
服务器信息:
master server's and point :
file server's and point:
you must confrim two server's point diffrence
上传后的文件:
页面回显: