了解SpringMVC的上传和下载
作者：wbcra
今天小编就为大家分享一篇关于Spring整合Springmvc的相关介绍，小编觉得内容挺不错的，现在分享给大家，具有很好的参考价值，需要的朋友一起跟随小编来看看吧
springmvc.xml的配置
<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"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
https://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
https://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 开启ioc注解开启扫描-->
<context:component-scan base-package="cn.hp"></context:component-scan>
<!-- 开启mvc的注解扫描 里面有个转换服务器-->
<mvc:annotation-driven ></mvc:annotation-driven>
<!-- 将视图解析器 交给spring-->
<bean id="resolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- <property name="prefix" value="/WEB-INF/pages/"></property>-->
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 配置一个bean 让他支持文件上传-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 俩属性 name="defaultEncoding" 编码格式utf-8
name="maxUploadSize" 文件上传最大 值 100M
-->
<property name="defaultEncoding" value="utf-8"></property>
<property name="maxUploadSize" value="10240000"></property>
</bean>
</beans>
web.xml的配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 初始化时加载springmvc配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:*.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<filter>
<filter-name>fileEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>Encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>fileEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
主要代码
package cn.hp.controller;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Random;
@Controller
public class FileUploadController {
@RequestMapping(value="upload.do")
public String upload(MultipartFile file[], HttpServletRequest request) throws IOException {
//1.获取上传文件路径
String path = request.getServletContext().getRealPath("/upload");
for (int i =0;i<file.length;i++) {
//2.拿到上传的文件名
String name = file[i].getOriginalFilename();
//3.改名，把用户上传的文件进行改名操作
String newNmae = new Date().getTime() + new Random().nextInt(999999) + name;
//4.实例化File类的对象加载上传的路径和文件
File f = new File(path + newNmae);
//5. MultipartFile里面的方法把这个路径的文件写入过去
file[i].transferTo(f);
}
return "success";
}
@RequestMapping(value="download.do")
public ResponseEntity<byte[]> download(@RequestParam("fileName") String fileName,HttpServletRequest request) throws IOException {
//1.下载路径
String path = request.getServletContext().getRealPath("/download/");
//2.实例化File类的对象加载下载的路径和文件
File f= new File(path+fileName);
//3.转格式
String newName = new String(fileName.getBytes("utf-8"),"iso8859-1");
//4.转流
HttpHeaders hh = new HttpHeaders();
hh.setContentDispositionFormData("attachment",newName);
hh.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//5.相应发送
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(f),hh, HttpStatus.CREATED);
}
}
NewFile.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%--如果说表单有文件上传的功能，那么表达就要设置这个属性--%>
<form action="upload" method="post" enctype="multipart/form-data">
文件上传<input type="file" name="file" /><br/>
文件上传<input type="file" name="file" /><br/>
文件上传<input type="file" name="file" /><br/>
<input type="submit" value="确定" />
</form>
<a href="download/自我介绍模板.docx">下载文件</a>
<a href="download/10.png">下载文件</a>
<a href="download/4.jpg">下载文件1</a>
<a href="download.do?fileName=新建文本文档.txt">下载文件2</a>
<a href="download/新建文本文档.txt">下载文件3</a>
</body>
</html>
success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
上传成功
</body>
</html>
总结
本篇文章就到这里了，希望能给你带来帮助，也希望您能够多多关注脚本之家的更多内容！