导入maven依赖
1 <dependencies> 2 <!--文件上传--> 3 <dependency> 4 <groupId>commons-fileupload</groupId> 5 <artifactId>commons-fileupload</artifactId> 6 <version>1.3.3</version> 7 </dependency> 8 <!--servlet-api 导入高版本--> 9 <dependency> 10 <groupId>javax.servlet</groupId> 11 <artifactId>javax.servlet-api</artifactId> 12 <version>4.0.1</version> 13 </dependency> 14 </dependencies>
配置web.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" 5 version="4.0"> 6 7 <servlet> 8 <servlet-name>DispatcherServlet</servlet-name> 9 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 10 <init-param> 11 <param-name>contextConfigLocation</param-name> 12 <param-value>classpath:applicationContext.xml</param-value> 13 </init-param> 14 <load-on-startup>1</load-on-startup> 15 </servlet> 16 17 <servlet-mapping> 18 <servlet-name>DispatcherServlet</servlet-name> 19 <url-pattern>/</url-pattern> 20 </servlet-mapping> 21 22 23 <!--防止中文乱码--> 24 <filter> 25 <filter-name>encoding</filter-name> 26 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 27 <init-param> 28 <param-name>encoding</param-name> 29 <param-value>UTF-8</param-value> 30 </init-param> 31 </filter> 32 <filter-mapping> 33 <filter-name>encoding</filter-name> 34 <url-pattern>/*</url-pattern> 35 </filter-mapping> 36 </web-app>
在src下的resources下建applicationContext.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:mvc="http://www.springframework.org/schema/mvc" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context.xsd 10 http://www.springframework.org/schema/mvc 11 http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 12 <!--自动扫描包,下面注解类交给iod容器处理--> 13 <context:component-scan base-package="com.rzk.controller"/> 14 <!--静态资源过滤--> 15 <mvc:default-servlet-handler/> 16 <!--注解驱动--> 17 <mvc:annotation-driven/> 18 <!--JSON乱码问题配置--> 19 <mvc:annotation-driven> 20 <mvc:message-converters> 21 <bean class="org.springframework.http.converter.StringHttpMessageConverter"> 22 <constructor-arg value="UTF-8"/> 23 </bean> 24 <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> 25 <property name="objectMapper"> 26 <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> 27 <property name="failOnEmptyBeans" value="false"/> 28 </bean> 29 </property> 30 </bean> 31 </mvc:message-converters> 32 </mvc:annotation-driven> 33 34 35 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 36 <property name="prefix" value="/WEB-INF/jsp/"/> 37 <property name="suffix" value=".jsp"/> 38 </bean> 39 40 <!--文件上传配置--> 41 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 42 <!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --> 43 <property name="defaultEncoding" value="utf-8"/> 44 <!-- 上传文件大小上限，单位为字节（10485760=10M） --> 45 <property name="maxUploadSize" value="10485760"/> 46 <property name="maxInMemorySize" value="40960"/> 47 </bean> 48 49 </beans>
新建上传页面
1 <form action="${pageContext.request.contextPath}/file/upload" method="post" enctype="multipart/form-data">
2 <input type="file" name="file">
3 <input type="submit" value="upload">
4 </form>
controller
1 @Controller
2 @RequestMapping("/file")
3 public class FileController {
4 //@RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象
5 //批量上传CommonsMultipartFile则为数组即可
6 @RequestMapping("/upload")
7 public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException {
8
9 //获取文件名 : file.getOriginalFilename();
10 String uploadFileName = file.getOriginalFilename();
11
12 //如果文件名为空，直接回到首页！
13 if ("".equals(uploadFileName)){
14 return "redirect:/index.jsp";
15 }
16 System.out.println("上传文件名 : "+uploadFileName);
17
18 //上传路径保存设置
19 String path = request.getServletContext().getRealPath("/upload");
20 //如果路径不存在，创建一个
21 File realPath = new File(path);
22 if (!realPath.exists()){
23 realPath.mkdir();
24 }
25 System.out.println("上传文件保存地址："+realPath);
26
27 InputStream is = file.getInputStream(); //文件输入流
28 OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件输出流
29
30 //读取写出
31 int len=0;
32 byte[] buffer = new byte[1024];
33 while ((len=is.read(buffer))!=-1){
34 os.write(buffer,0,len);
35 os.flush();
36 }
37 os.close();
38 is.close();
39 return "redirect:/index.jsp";
40 }
41 }
controller第二种上传方式
1 @RequestMapping("/upload2")
2 public String fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
3
4 //上传路径保存设置
5 String path = request.getServletContext().getRealPath("/upload");
6 File realPath = new File(path);
7 if (!realPath.exists()){
8 realPath.mkdir();
9 }
10 //上传文件地址
11 System.out.println("上传文件保存地址："+realPath);
12
13 //通过CommonsMultipartFile的方法直接写文件（注意这个时候）
14 file.transferTo(new File(realPath +"/"+ file.getOriginalFilename()));
15
16 return "redirect:/index.jsp";
17 }