springMVC实现文件上传和下载

springMVC实现文件上传和下载

本文实例为大家分享了springMVC实现文件上传和下载的具体代码，供大家参考，具体内容如下

1准备工作

web.xml文件导入DispatcherServlet，CharacterEncodingFilter

springmvc

org.springframework.web.servlet.Dispahttp://tcherServlet

contextConfigLocation

classpath:applicationContext.xml

1

springmvc

/

encoding

org.springframework.web.filter.CharacterEncodingFilter

encoding

utf-8

encoding

/*

前端测试页面

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

<%-- 必须将表单的method设置为POST--%>

<%-- 设置enctype属性为multipart/form-data，二进制传递数据--%>

点击下载

spring配置文件applicationContext.xml

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/context

https://springframework.org/schema/context/spring-context.xsd

http://springframework.org/schema/mvc

https://springframework.org/schema/mvc/spring-mvc.xsd">

id="internalResourceViewResolver">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/context

https://springframework.org/schema/context/spring-context.xsd

http://springframework.org/schema/mvc

https://springframework.org/schema/mvc/spring-mvc.xsd">

id="internalResourceViewResolver">

id="internalResourceViewResolver">

2.文件上传

controller

package com.zky.controller;

import org.springframework.stereotype.Controller;

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

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

import org.springframework.web.multipart.commons.CommonsMultipartFile;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

import java.net.URLEncoder;

@Controller

public class FileController {

//@RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象

//批量上传CommonsMultipartFile则为数组即可

@RequestMapping("/upload")

public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException {

//获取文件名 : file.getOriginalFilename();

String uploadFileName = file.getOriginalFilename();

//如果文件名为空，直接回到首页！

if ("".equals(uploadFileName)){

return "redirect:/index.jsp";

}

System.out.println("上传文件名 : "+uploadFileName);

//上传路径保存设置

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

//如果路径不存在，创建一个

File realPath = new File(path);

if (!realPath.exists()){

realPath.mkdir();

}

System.out.println("上传文件保存地址："+realPath);

InputStream is = file.getInputStream(); //文件输入流

OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件输出流

//读取写出

int len=0;

byte[] buffer = new byte[1024];

while ((len=is.read(buffer))!=-1){

os.write(buffer,0,len);

os.flush();

}

os.close();

is.close();

return "redirect:/index.jsp";

}

}

采用file.Transto 来保存上传的文件

/*

* 采用file.Transto 来保存上传的文件

*/

@RequestMapping("/upload2")

public String fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {

//上传路径保存设置

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

File realPath = new File(path);

if (!realPath.exists()){

realPath.mkdir();

}

//上传文件地址

System.out.println("上传文件保存地址："+realPath);

//通过CommonsMultipartFile的方法直接写文件（注意这个时候）

file.transferTo(new File(realPath +"/"+ file.getOriginalFilename()));

return "redirect:/index.jsp";

}

3.文件下载

@RequestMapping(value="/download")

public String downloads(HttpServletResponse response , HttpServletRequest request) throws Exception{

//要下载的图片地址，改为自己图片路径,我是下载在我的项目里面的

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

//文件名

String fileName = "新建文本文档.txt";

//1、设置response 响应头

response.reset(); //设置页面不缓存,清空buffer

response.setCharacterEncoding("UTF-8"); //字符编码bGepjnMDy

response.setContentType("multipart/form-data"); //二进制传输数据

//设置响应头

response.setHeader("Content-Disposition",

"attachment;fileName="+ URLEncoder.encode(fileName, "UTF-8"));

File file = new File(path,fileName);

//2、 读取文件--输入流

InputStream input=new FileInputStream(file);

//3、 写出文件--输出流

OutputStream out = response.getOutputStream();

byte[] buff =new byte[1024];

int index=0;

//4、执行 写出操作

while((index= input.read(buff))!= -1){

out.write(buff, 0, index);

out.flush();

}

out.close();

input.close();

return null;

}

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