SpringMVC文件上传
1、单文件上传
第一步、创建javawe项目并导入依赖包
spring-expression-4.3.2.RELEASE.jar
commons-fileupload-1.2.2.jar
spring-beans-4.3.2.RELEASE.jar
spring-context-4.3.2.RELEASE.jar
jackson-annotations-2.9.5.jar
jackson-databind-2.9.5.jar
spring-core-4.3.2.RELEASE.jar
spring-aop-4.3.2.RELEASE.jar
jackson-core-2.9.5.jar
spring-webmvc-4.3.2.RELEASE.jar
spring-web-4.3.2.RELEASE.jar
上传文件的依赖包
commons-io-1.4.jar
commons-logging-1.2.jar
第二步、编写上传文件页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>上传图片</title>
</head>
<body>
<fieldset>
<legend>单个文件上传</legend>
<form action="${pageContext.request.contextPath}/upload.do" method="post" enctype="multipart/form-data">
姓名: <input name="username"><br>
头像: <input type="file" name="headImg"><br>
<button type="submit">提交</button>
</form>
</fieldset>
</body>
</html>
注意:
enctype="multipart/form-data" 转化为二进制流提交
默认是表单提交
第三步、修改web.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<!--配置编码过滤器-->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<!--设置参数-->
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--配置前端过滤器-->
<servlet>
<servlet-name>MVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!--容器启动就加载配置文件-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>MVC</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
第四步、配置spring配置文件
<?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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<!--配置包扫描-->
<context:component-scan base-package="com.kl"/>
<!--支持注解驱动-->
<mvc:annotation-driven/>
<!--配置文件上传解析器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--设置上传文件的属性 单位 ： bytes #可以计算-->
<property name="maxUploadSize" value="#{1024*1024}"/>
</bean>
</beans>
第五步、编写上传控制器
package com.kl.controller;
import org.apache.commons.io.FilenameUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
@Controller
public class UploadController {
@PostMapping(value = "/upload")
public String singleUpload(MultipartFile headImg, @RequestParam("username")String username){
System.out.println("文件名:"+headImg.getOriginalFilename());
System.out.println("上传用户:"+username);
//保存到指定路径的文件对象
File destFile= new File("G:/upload");
//如果没有该路径就创建
if (!destFile.exists()){
destFile.mkdir();
}
//文件的随机名称
String fileName = UUID.randomUUID().toString().replaceAll("-", "");
//使用FileNameUtils获取上传文件名的后缀
String extension = FilenameUtils.getExtension(headImg.getOriginalFilename());
//创建新的文件名称
String newFileName = fileName+"."+extension+headImg.getOriginalFilename();
//创建要保存文件的对象 参数 路径 + 文件
File file = new File(destFile,newFileName);
//保存文件包本地磁盘
try {
headImg.transferTo(file);
System.out.println("上传成功");
} catch (IOException e) {
e.printStackTrace();
System.out.println("上传失败");
}
return "redirect:/upload.jsp";
}
}
2、多文件上传
第一步、编写上传页面
<fieldset>
<legend>多个文件上传</legend>
<form action="${pageContext.request.contextPath}/uploads.do" method="post" enctype="multipart/form-data">
文件1: <input type="file" name="headImgs"><br>
文件2: <input type="file" name="headImgs"><br>
文件3: <input type="file" name="headImgs"><br>
<button type="submit">提交</button>
</form>
</fieldset>
第二步、编写上传控制器
//多文件上传
@PostMapping(value = "/uploads")
public String MultipartUpload(MultipartFile[] headImgs){
//保存到指定路径的文件对象
File destFile= new File("G:/upload");
//如果没有该路径就创建
if (!destFile.exists()){
destFile.mkdir();
}
for (int i = 0; i < headImgs.length; i++) {
/*取到第i个文件*/
MultipartFile headImg = headImgs[i];
System.out.println("文件名称:"+headImg.getOriginalFilename());
//使用uuid作为文件随机名称
String fileName = UUID.randomUUID().toString().replaceAll("-", "");
//使用FileNameUtils获取上传文件名的后缀
String extension = FilenameUtils.getExtension(headImg.getOriginalFilename());// jpg , png 等等
//创建新的文件名称
String newFileName = fileName + "."+extension+headImg.getOriginalFilename();
//创建要保存文件的File对象
File file = new File(destFile, newFileName);
try {
headImg.transferTo(file);
System.out.println("上传成功");
} catch (IOException e) {
e.printStackTrace();
System.out.println("上传失败");
}
}
return "redirect:/upload.jsp";
}
3、文件下载
第一步、编写文件下载页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>下载页面</title>
</head>
<body>
点击连接开始下载资料:
<a href="${pageContext.request.contextPath}/download.do?fileName=毕业论文.docx">下载</a>
</body>
</html>
第二步、编写控制器
package com.kl.controller;
import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
@Controller
public class DownLoadController {
@RequestMapping(value = "/download")
public void downLoad(HttpServletRequest request, HttpServletResponse response,String fileName) {
System.out.println("下载的文件名称:" + fileName);
try {
/*获取从磁盘文件的输入流*/
FileInputStream fis = new FileInputStream("G:/upload/" + fileName);
//2.获取输出流对象
ServletOutputStream sos = response.getOutputStream();
/*获取请求头*/
String userAgent = request.getHeader("User-Agent");
System.out.println("用户代理:" + userAgent);
//W3C标准浏览器 MSIE浏览器内核标识
if (!userAgent.contains("MSIE")) {
//先将UTF-8的字符串转换成 字节数组
byte[] bytes = fileName.getBytes("UTF-8");
//再讲字节数组转换成ISO-8859-1 编码的字符串
fileName = new String(bytes, "ISO-8859-1");
}
//4.响应的内容应该是以附件的形式响应给浏览器(设置响应头)
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
/*
* 使用Apache commons-io 工具包中 IOUtils工具
*/
//5.响应数据给浏览器（下载）
IOUtils.copy(fis, sos);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
/*不要返回任何东西*/
}
}