19-文件上传
作者：互联网
文件上传
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>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encoding</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>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
pom.xml
<dependencies>
<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>4.0.1</version>
</dependency>
</dependencies>
applicationContext.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">
<!--处理器映射器-->
<context:component-scan base-package="com.kuang.controller"/>
<!-- 静态资源过滤 -->
<mvc:default-servlet-handler/>
<mvc:annotation-driven/>
<!-- JSON乱码问题配置 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp" />
</bean>
<!-- 文件上传配置-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"/>
<property name="maxUploadSize" value="10485760"/>
<property name="maxInMemorySize" value="40960"/>
</bean>
</beans>
jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/upload2" enctype="multipart/form-data" method="post">
<input type="file" name="file"/>
<input type="submit" value="upload"/>
</form>
</body>
</html>
controller
package com.kuang.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.commons.CommonsMultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
@RestController
public class FileController {
@RequestMapping("/upload")
public String fileUpload(@RequestParam("file")CommonsMultipartFile file, HttpServletRequest request) throws IOException {
String uploadFileName = file.getOriginalFilename();
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();
OutputStream os = new FileOutputStream(new File(realPath, uploadFileName));
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";
}
@RequestMapping("/upload2")
public String fileUpload2(@RequestParam("file")CommonsMultipartFile file, HttpServletRequest request) throws IOException {
String path = request.getServletContext().getRealPath("/upload");
File realPath = new File(path);
if(!realPath.exists()){
realPath.mkdir();
}
System.out.println("上传文件保存地址："+realPath);
file.transferTo(new File(realPath+"/"+file.getOriginalFilename()));
return "redirect:/index.jsp";
}
@RequestMapping(value="/download")
public String downloads(HttpServletResponse response,HttpServletRequest request) throws Exception {
System.out.println("downloads()");
//要下载的图片地址
String path=request.getServletContext().getRealPath("/upload");
String fileName="4.png";
response.reset();
response.setCharacterEncoding("UTF-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(fileName,"UTF-8"));
File file=new File(path,fileName);
InputStream input = new FileInputStream(file);
OutputStream out = response.getOutputStream();
byte[] buff = new byte[1024];
int index=0;
while((index=input.read(buff))!=-1){
out.write(buff,0,index);
out.flush();
}
out.close();
input.close();
return "ok";
}
}
标签：文件,String,realPath,19,file,import,new,上传,out 来源： https://blog.csdn.net/xixihaha_coder/article/details/120142233