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  • springMvc---跨服务器文件上传(实测总结)

    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:

      

    Best Regards
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  • 原文地址:https://www.cnblogs.com/pecool/p/9669030.html
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