【无标题】
作者：互联网
springmvc的文件上传与下载
1、导入依赖包
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
2、web.xml
<?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>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherservlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--配置过滤器-->
<filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
3、springmvc-servlet.xml
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--JSON乱码问题配置-->
<!-- <mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>-->
<!--自动扫描包,让指定包下的注解生效，由IOC容器统一管理-->
<context:component-scan base-package="com.mzj.controller"/>
<!--开启springmvc注解模式-->
<mvc:annotation-driven/>
<!--过滤静态资源-->
<mvc:default-servlet-handler/>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
<!--文件上传的配置-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--请求编码格式，必须和jsp的pageEncoding属性一致，以便于正确读取表单数据，默认为ISO-8859-1 -->
<property name="defaultEncoding" value="utf-8"/>
<!-- 上传文件大小上限，单位为字节，10485760 = 10M -->
<property name="maxUploadSize" value="10485760"/>
</bean>
</beans>
4、创建上传页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<form action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data" method="post">
<input type="file" name="file" />
<input type="submit" value="upload" />
</form>
5、在配置springmvc-servlet.xml文件中配置
<!--文件上传的配置-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--请求编码格式，必须和jsp的pageEncoding属性一致，以便于正确读取表单数据，默认为ISO-8859-1 -->
<property name="defaultEncoding" value="utf-8"/>
<!-- 上传文件大小上限，单位为字节，10485760 = 10M -->
<property name="maxUploadSize" value="10485760"/>
</bean>
6、创建Controller
package com.mzj.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* @author XM
*/
@RestController
public class FileUpload {
/**
* 原生态文件上传写入，用字节输入输出流
*
* @param filename
* @param file
* @param request
* @return
* @throws IOException
*/
@RequestMapping("/upload")
public String fileupload(String filename, MultipartFile file, HttpServletRequest request) throws IOException {
// 获取文件名
String uploadFileName = file.getOriginalFilename();
// 如果文件名为空，直接返回到首页
if ("".equals(uploadFileName)) {
return "redirect:/index.jsp";
}
System.out.println("上传文件名为：" + uploadFileName);
// 上传路径保存设置
String path = request.getServletContext().getRealPath("/upload");
// 如果路径不存在就创建一个
File realPath = new File(path);
if (!realPath.exists()) {
realPath.mkdir();
}
System.out.println("上传文件保存地址：" + realPath);
// 文件输入流
InputStream is = file.getInputStream();
FileOutputStream os = new FileOutputStream(new File(realPath, uploadFileName));
// 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.transferTo来保存上传的文件
*/
@RequestMapping("/uoload2")
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
file.transferTo(new File(realPath + "/" + file.getOriginalFilename()));
return "redirect:/index.jsp";
}
}
标签：web,realPath,无标题,springframework,file,import,上传 来源： https://blog.csdn.net/m0_46235711/article/details/121684408