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首先一定要在pom.xml文件中导入两个坐标依赖,主要是用于文件上传所用的:
<!-- 文件上传需要导入的坐标依赖 --><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency>
其次我们要配置文件SpringMVC.xml中配置上传的文件解析器:
<!-- 配置文件解析器 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 上传文件大小10M = 10 * 1024 * 1024 --><property name="maxUploadSize" value="10485760"></property></bean>
在前端的form表单提交当中,一定要有 enctype = "multipart/form-data",并且为post请求
<%-- 传统文件上传 --%><h3>传统方式</h3><form action="file/fileUpload1" method="post" enctype="multipart/form-data">选择文件:<input type="file" name="upload"></br><input type="submit" value="上传"></form><h3>SpringMVC方式</h3><form action="file/fileUpload2" method="post" enctype="multipart/form-data">选择文件:<input type="file" name="upload"></br><input type="submit" value="上传"></form>
!!!传统的文件上传方式 controller层代码!!!
/*** 第一个文件上传(传统的文件上传方式)** @return*/@RequestMapping("/fileUpload1")public String fileUpload1(HttpServletRequest request) throws Exception{//使用fileupload组件完成文件上传//上传的位置要指定String path = request.getSession().getServletContext().getRealPath("/uploads/");//判断该路径是否存在File file = new File(path);if (!file.exists()) {//如果这个文件夹不存在的话,就创建这个文件file.mkdirs();}//解析request对象,从而获取上传文件项DiskFileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);//解析requestList<FileItem> items = upload.parseRequest(request);//遍历for (FileItem item : items) {//进行判断,当前Item对象是否为普通表单项if (item.isFormField()) {//说明是true,则为普通表单项} else {//如果为false,说明是文件上传项//获取上传文件名称String filename = item.getName();//把文件名称设置成唯一值 uuid 以防止文件名相同覆盖String uuid = UUID.randomUUID().toString().replace("-","");//新文件名filename = uuid + "_" + filename;//完成文件上传item.write(new File(path,filename));System.out.println(path + filename);//删除临时文件item.delete();}}return "success";}
!!!基于SpringMVC的文件上传方式的controller层代码!!!
/*** SpingMVC的方式上传** @return*/@RequestMapping("/fileUpload2")//这里要记得使用MultipartFile获取前端传过来的input文件框(type=file),参数名就是namepublic String fileUpload2(HttpServletRequest request, MultipartFile upload) throws Exception{//使用fileupload组件完成文件上传//上传的位置要指定String path = request.getSession().getServletContext().getRealPath("/uploads/");//判断该路径是否存在File file = new File(path);if (!file.exists()) {//如果这个文件夹不存在的话,就创建这个文件file.mkdirs();}//获取上传文件名称String filename = upload.getOriginalFilename();//把文件名称设置成唯一值 uuid 以防止文件名相同覆盖String uuid = UUID.randomUUID().toString().replace("-","");//新文件名filename = uuid + "_" + filename;//完成文件上传upload.transferTo(new File(path,filename));return "success";}
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接下来提供配置环境:
这里提供这个案例中的整个pom.xml文件:
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.ysw</groupId><artifactId>day03_SpringMvcFileUpload</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>day03_SpringMvcFileUpload Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><!-- 版本锁定 --><spring.version>5.0.2.RELEASE</spring.version></properties><dependencies><!--导入Spring坐标依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><!-- 导入SpringMVC坐标依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><!-- 导入servlet的坐标依赖 --><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version><scope>provided</scope></dependency><!-- 导入jsp的坐标依赖 --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.0</version><scope>provided</scope></dependency><!-- 单元测试的坐标依赖 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!-- 文件上传需要导入的坐标依赖 --><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency><!-- 跨服务器文件上传的坐标依赖 --><dependency><groupId>com.sun.jersey</groupId><artifactId>jersey-core</artifactId><version>1.18.1</version></dependency><dependency><groupId>com.sun.jersey</groupId><artifactId>jersey-client</artifactId><version>1.18.1</version></dependency></dependencies><build><finalName>day03_SpringMvcFileUpload</finalName><pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --><plugins><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></pluginManagement></build>
</project>
提供整个web.xml文件:
<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name><!--配置前端控制器--><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.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><!--配置解决中文乱码的过滤器--><filter><filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>
提供整个SpringMVC.xml配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!-- 开启注解的扫描 --><context:component-scan base-package="com.ysw.controller"></context:component-scan><!-- 配置试图解析器,用于controller成功之后返回的时候跳转用的 --><bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 配置这个的目的是成功之后跳转到 /WEB-INF/pages/目录下的文件/WEB-INF/pages/ --><!-- 这种是默认跳转到webapp路径下的 --><property name="prefix" value="/"></property><!-- 文件后缀名 --><property name="suffix" value=".jsp"></property></bean><!--前端控制器,哪些静态资源不拦截这里的意思是在/js、css、images目录下所有的文件都不会进行拦截--><!--前端控制器,哪些静态资源不拦截--><mvc:resources location="/css/" mapping="/css/**"/><mvc:resources location="/images/" mapping="/images/**"/><mvc:resources location="/js/" mapping="/js/**"/><!-- 配置文件解析器 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 上传文件大小10M = 10 * 1024 * 1024 --><property name="maxUploadSize" value="10485760"></property></bean><!-- 开启SpringMvc框架对注解的支持 --><mvc:annotation-driven></mvc:annotation-driven></beans>