springmvc的文件上传和下载

把以前的笔记做到这里方便复制。

一、 添加依赖和配置

添加依赖pom.xml

        <!-- commons-fileupload -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>
        <!-- commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

springmvc-servlet.xml中添加CommonsMultipartResolver

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <property name="defaultEncoding" value="utf-8"></property>   
        <property name="maxUploadSize" value="10485760000"></property>  
        <property name="maxInMemorySize" value="40960"></property>  
    </bean>

二、 springmvc的文件上传

在webapp目录下新建个upload文件夹。

写springmvc文件上传FileUploadController

package com.imddy.tsession.controller;

import java.io.File;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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 org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/fileupload/")
public class FileUploadController {

    private static Log log = LogFactory.getLog(FileUploadController.class);

    @RequestMapping("upload1")
    public String upload1(HttpServletRequest request, @RequestParam("file1") MultipartFile file1) {
        // 判断文件是否为空  
        if (!file1.isEmpty()) {
            try {
                // 文件保存路径 
                String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"
                        + file1.getOriginalFilename();
                // 转存文件  
                file1.transferTo(new File(filePath));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("UserName:" + username);
        System.out.println("Password:" + password);
        log.info("UserName:" + username);
        log.info("Password:" + password);
        // 重定向 
        return "redirect:/fileupload/filelist.do";
    }

    @RequestMapping("filelist")
    public ModelAndView filelist(HttpServletRequest request) {
        String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/";
        ModelAndView mav = new ModelAndView("/filelist");
        File uploadDest = new File(filePath);
        String[] fileNames = uploadDest.list();
        for (int i = 0; i < fileNames.length; i++) {
            //打印出文件名 
            System.out.println(fileNames[i]);
            System.out.println(filePath);
            log.info(fileNames[i]);
            log.info(filePath);
        }
        String path = request.getContextPath();
        String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
        mav.addObject("uploadPath", basePath+"upload/");
        mav.addObject("fileNames", fileNames);
        return mav;
    }

     @SuppressWarnings("unused")
     private boolean saveFile(MultipartFile file) {  
            // 判断文件是否为空  
            if (!file.isEmpty()) {
                try {
                    // 文件保存路径  
                    // String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/" + file.getOriginalFilename();
                    String filePath = "/usr/local/upload/" + file.getOriginalFilename();
                    // 转存文件 
                    file.transferTo(new File(filePath));
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return false;
     }

     private boolean saveFile2(HttpServletRequest request,MultipartFile file) {  
            // 判断文件是否为空  
            if (!file.isEmpty()) {
                try {
                    // 文件保存路径  
                    String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/" + file.getOriginalFilename();
                    // 转存文件 
                    file.transferTo(new File(filePath));
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return false;
     }

     @RequestMapping("upload2")  
        public String upload2(@RequestParam("files") MultipartFile[] files, HttpServletRequest request) {  
            //判断file数组不能为空并且长度大于0
            if(files!=null&&files.length>0){
                //循环获取file数组中得文件 
                for(int i = 0;i<files.length;i++){
                    MultipartFile file = files[i];
                    //保存文件 
                    System.out.println("True&False : " + saveFile2(request,file));
                }
            }
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            System.out.println("2UserName:" + username);
            System.out.println("2Password:" + password);
            log.info("2UserName:" + username);
            log.info("2Password:" + password);
            // 重定向  
            return "redirect:/fileupload/filelist.do";
     }

}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index.jsp</title>
<body>
<h2>Hello World!</h2>
<a href = "t.do">t.do</a><br>
<a href = "loginGet.do">loginGet.do</a><br>
<hr>
<a href = "Test/t.do">Test/t.do</a><br>
<a href = "Test/loginGet.do">Test/loginGet.do</a><br>

<hr>
<a href = "fileupload/filelist.do">fileupload/filelist.do</a><br>
<a href = "fileupload1.jsp">fileupload1.jsp</a><br>
<a href = "fileupload2.jsp">fileupload2.jsp</a><br>
<hr>
<a href = "fileupload11.jsp">fileupload11.jsp</a><br>
<a href = "fileupload12.jsp">fileupload12.jsp</a><br>
<a href = "filedownload.jsp">filedownload.jsp</a><br>
</body>
</html>

fileupload1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script type="text/javascript">

</script>

<title>fileupload.jsp</title>
</head>
<body>

    <form role="form" action="fileupload/upload1.do" enctype="multipart/form-data" method="post" class="col-md-6 col-md-offset-3">
        <input type="file" name="file1" placeholder="文件1">
        <input type="text" name="username" class="form-control" placeholder="请输入用户名" >
        <input type="password" name="password" class="form-control" placeholder="请输入密码" >
        <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>
    </form>

</body>
</html>

fileupload2.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script type="text/javascript">

</script>

<title>fileupload.jsp</title>
</head>
<body>

    <form role="form" action="fileupload/upload2.do" enctype="multipart/form-data" method="post" class="col-md-6 col-md-offset-3">
        <input type="file" name="files" placeholder="文件1">
        <input type="file" name="files" placeholder="文件2">
        <input type="file" name="files" placeholder="文件3">
        <input type="text" name="username" class="form-control" placeholder="请输入用户名" >
        <input type="password" name="password" class="form-control" placeholder="请输入密码" >
        <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>
    </form>

</body>
</html>

filelist.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml"%>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script type="text/javascript">

</script>

<title>fileupload.jsp</title>
</head>
<body>

uploadPath:<c:out value="${uploadPath}"></c:out><br>
<hr>
<c:forEach items="${fileNames}" var="filename">
    <li><a href="${uploadPath }${filename}" class="showimg">${filename}</a></li><br>
</c:forEach>

</body>
</html>

文件上传不好看使用了bootstrap-fileinput

fileupload11.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<link href="./jslib/bootstrap-fileinput-4.4.6/css/fileinput.min.css" media="all" rel="stylesheet" type="text/css"/>
<link href="./jslib/bootstrap-fileinput-4.4.6/themes/explorer-fa/theme.css" media="all" rel="stylesheet" type="text/css"/>

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script src="./jslib/bootstrap-fileinput-4.4.6/js/plugins/sortable.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/fileinput.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/locales/fr.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/locales/es.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/themes/explorer-fa/theme.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/themes/fa/theme.js" type="text/javascript"></script>

<script type="text/javascript">

</script>

<title>fileupload.jsp</title>
</head>
<body>

    <form role="form" action="fileupload/upload1.do" enctype="multipart/form-data" method="post" class="col-md-6 col-md-offset-3">

        <input id="input-b0" name="file1" type="file" class="file" data-show-preview="false">
        <input type="text" name="username" class="form-control" placeholder="请输入用户名" >
        <input type="password" name="password" class="form-control" placeholder="请输入密码" >
        <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>

    </form>

</body>
</html>

fileupload12.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<link href="./jslib/bootstrap-fileinput-4.4.6/css/fileinput.min.css" media="all" rel="stylesheet" type="text/css"/>
<link href="./jslib/bootstrap-fileinput-4.4.6/themes/explorer-fa/theme.css" media="all" rel="stylesheet" type="text/css"/>

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script src="./jslib/bootstrap-fileinput-4.4.6/js/plugins/sortable.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/fileinput.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/locales/fr.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/js/locales/es.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/themes/explorer-fa/theme.js" type="text/javascript"></script>
<script src="./jslib/bootstrap-fileinput-4.4.6/themes/fa/theme.js" type="text/javascript"></script>

<script type="text/javascript">

</script>

<title>fileupload.jsp</title>
</head>
<body>

    <form role="form" action="fileupload/upload2.do" enctype="multipart/form-data" method="post" class="col-md-6 col-md-offset-3">

        <input id="input-b1" name="files" type="file" class="file" placeholder="文件1" data-show-preview="false">
        <input id="input-b2" name="files" type="file" class="file" placeholder="文件2" data-show-preview="false">
        <input id="input-b3" name="files" type="file" class="file" placeholder="文件3" data-show-preview="false">
        <input type="text" name="username" class="form-control" placeholder="请输入用户名" >
        <input type="password" name="password" class="form-control" placeholder="请输入密码" >
        <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>

    </form>

</body>
</html>

这样文件就用文件上传就会好看多了。

四、springmvc文件下载

springmvc文件下载FileDownloadController

package com.imddy.tsession.controller;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/filedownload")
public class FileDownloadController {

    private static Log log = LogFactory.getLog(FileDownloadController.class);

    public static void download(String fileName, String filePath, HttpServletRequest request, HttpServletResponse response) throws Exception {
        if (fileName != null) {
            File file = new File(filePath, fileName);
            System.out.println("file路径:" + file);
            if (file.exists()) {
                // 设置强制下载不打开,也有设置成response.setContentType("application/octet-stream charset=utf-8");
                response.setContentType("application/force-download charset=utf-8");
                // 设置文件名
                response.addHeader("Content-Disposition","attachment;fileName=" + new String(fileName.getBytes("UTF-8"), "iso8859-1"));
                response.setContentLength((int) file.length());
                byte[] buffer = new byte[1024];  
                FileInputStream fis = null;  
                BufferedInputStream bis = null;

                try {
                    fis = new FileInputStream(file);
                    bis = new BufferedInputStream(fis);
                    OutputStream os = response.getOutputStream();
                    int i = bis.read(buffer);
                    while (i != -1) {
                        os.write(buffer, 0, i);
                        i = bis.read(buffer);
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } finally {
                    if (bis != null) {
                        try {
                            bis.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();  
                        }
                    }
                    if (fis != null) {
                        try {
                            fis.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }

            } else {
                System.out.println("文件不存在");
            }
        } else {
            System.out.println("下载的文件名为空");
        }

    }

    @RequestMapping("down")
    public void down(String fileName, HttpServletRequest request, HttpServletResponse response) throws Exception {
        request.setCharacterEncoding("UTF-8");
        String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/";
        System.out.println("fileName: " + fileName);
        System.out.println("filePath: " + filePath);
        log.info("fileName: " + fileName);
        log.info("filePath: " + filePath);
        download(fileName, filePath, request, response);
    }

}

filedownload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="./jslib/bootstrap/css/bootstrap-theme.min.css" rel="stylesheet">
<link href="./jslib/bootstrap/css/bootstrap.min.css" rel="stylesheet">

<script src="./jslib/jquery/1.12.4/jquery.min.js"></script>
<script src="./jslib/bootstrap/js/bootstrap.min.js"></script>

<script type="text/javascript">

</script>

<title>filedownload.jsp</title>
</head>
<body>

    <form role="form" action="filedownload/down.do" enctype="multipart/form-data" method="post" class="col-md-6 col-md-offset-3">
        <input type="text" name="fileName" placeholder="下载的文件名称">
        <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>
    </form>

</body>
</html>

结论：

文章永久链接：https://tech.souyunku.com/24811