14.SpringMVC之文件上传下载

SpringMVC通过MultipartResolver（多部件解析器）对象实现对文件上传的支持。

MultipartResolver是一个接口对象，需要通过它的实现类CommonsMultipartResolver来完成文件的上传工作。

1.上传需要jar包 commons-fileupload.jar commons-io.jar

2.使用MultipartResolver对象，在XML中配置Bean.

<?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-4.3.xsd

       http://www.springframework.org/schema/context

       http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <context:annotation-config/>

    <context:component-scan base-package="com.wxy.controller"/>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/jsp/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

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

        <property name="defaultEncoding" value="UTF-8" />

        <property name="maxUploadSize" value="2097152" />

    </bean>

</beans>

3.fileUpload.jsp上传页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>文件上传</title>

    <script>

        <%--判断是否填写上传人并已经选择上传文件--%>

        function check() {

            var name = document.getElementById("name").value();

            var name = document.getElementById("file").value();

            if(name==""){

                alert("请填写上传人");

                return false;

            }

            if(file.length==0||file==""){

                alert("请选择上传文件");

                return false;

            }

            return true;

        }

    </script>

</head>

<body>

<%--enctype="multipart/form-data"采用二进制流处理表单数据--%>

<form action="${pageContext.request.contextPath}/fileUpload.action" method="post" enctype="multipart/form-data" onsubmit="return check()">

    上传人：<input id="name" type="text" name="name"/><br/>

    请选择文件：<input id="file" type="file" name="uploadfile" multiple="multiple"/><br/>

    <%--multiple属性选择多个文件上传--%>

    <input type="submit" value="文件上传" />

</form>

</body>

</html>

4.fileDownload.jsp下载页面

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>

<%@ page import="java.net.URLEncoder" %>

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <title>文件下载</title>

</head>

<body>

<a href="${pageContext.request.contextPath}/download.action?filename=<%=URLEncoder.encode("图像.txt","UTF-8")%>">文件下载</a>

</body>

</html>

5.FileUploadAndDownloadController.java文件上传和下载控制器类

package com.wxy.controller;

import org.apache.commons.io.FileUtils;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;

import java.io.File;

import java.net.URLEncoder;

import java.util.List;

import java.util.UUID;

@Controller("controller")

public class FileUploadAndDownloadController {

    @RequestMapping("/tofileUpload")

    public String toupload(){

        return "fileUpload";

    }

    @RequestMapping("/tofiledownload")

    public String todownload(){

        return "download";

    }

    @RequestMapping("/fileUpload.action")

    public String handleFormUpload(@RequestParam("name") String name,

                                   @RequestParam("uploadfile") List<MultipartFile> uploadfile, HttpServletRequest request) {

        if (!uploadfile.isEmpty() && uploadfile.size() > 0) {

            for (MultipartFile file : uploadfile) {

                String originalFilename = file.getOriginalFilename();

                String dirPath = request.getServletContext().getRealPath("/upload/");

                File filePath = new File(dirPath);

                if (!filePath.exists()) {

                    filePath.mkdirs();

                }

                String newFilename = name +"_" + originalFilename;

                try {

                    file.transferTo(new File(dirPath + "_"+newFilename));

                } catch (Exception e) {

                    e.printStackTrace();

                    return "error";

                }

            }

            return "success";

        } else {

            return "error";

        }

    }

    @RequestMapping("/download.action")

    public ResponseEntity<byte[]> filedownload(HttpServletRequest request,String filename) throws Exception{

        String path = request.getServletContext().getRealPath("/upload");

        File file = new File(path+File.separator+filename);

        filename = this.getFilename(request,filename);

        HttpHeaders headers = new HttpHeaders();

        headers.setContentDispositionFormData("attachment",filename);

        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);

    }

    public String getFilename(HttpServletRequest request,String filename) throws Exception{

        String[] IEBrowserKeyWord = {"MSIE","Trident","Edge"};

        String userAgent = request.getHeader("User-Agent");

        for(String keyWord:IEBrowserKeyWord){

            if(userAgent.contains(keyWord)){

                return URLEncoder.encode(filename,"UTF-8");

            }

        }

        return new String(filename.getBytes("UTF-8"),"ISO-8859-1");

    }

}

巴特西

14.SpringMVC之文件上传下载

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