mendeliangyang 2020-02-20
SSM:Mybatis + Spring + SpringMVC
Model(模型):数据模型,提供要展示的数据,因此包含数据和行为,可以认为是领域模型或JavaBean组件(包含数据和行为),不过现在一般都分离开来:Value Object(数据Dao)和服务层(行为Service)。也就是模型提供了模型数据查询和模型数据的状态更新等功能,包括数据和业务。
View(视图):负责进行模型的展示,一般就是我们见到的用户界面,客户想看到的东西。
Colltroller(控制器):接收用户请求,委托给模型进行处理(状态改变),处理完毕后把返回代数据模型数据返回给视图,由视图负责展示。也就是说是控制器做了个调度员的工作
表现层,业务层,持久层
一般指web层。负责接收客户端请求,向客户端相应结果
表现层包括展示层和控制层!(控制层负责接收请求,展示层负责结果的展示)
表现层依赖于业务层,接收到客户端请求一般会调用业务层进行业务处理,并将结果返回给客户端。
表现层的设计一般使用MVC模型。(MVC是表现层的设计模型,和其他层没有关系)
一般指service层,负责业务逻辑处理
表现层依赖业务层,但是业务层不依赖表现层
业务层在业务处理时,可能会依赖持久层,如果要对数据持久化需要保证事务一致性。
一般指dao层,负责数据持久化
持久层包括数据库和数据访问层(数据库是载体,数据访问层是业务层和持久层交互的接口)
业务层通过数据访问层将数据持久化到数据库中。
比较典型的MVC模式:JSP+Servlet+JavaBean
MVC:模型(dao,service)视图(jsp)控制器(Servlet)
职责分析
controller:控制器
Model:模型
View:视图
MVC框架做的事情
SpringMVC是Spring Framework的一部分,是基于Java实现的MVC的轻量级Web框架
特点:
Spring的web框架围绕DispatcherServlet[调度Servlet]设计。
DispatcherServlet的作用是将请求分发到不同的处理器。
SpringMVC框架以请求为驱动,围绕一个中心Servlet分派请求及提供其他功能,DispatcherServlet是一个实际的Servlet(他继承自HttpServlet基类)
发起请求时,被前置的控制器拦截到请求,根据请求参数生成代理请求,找到请求对应的实际控制器,控制器处理请求,创建数据模型,访问数据库,将模型响应给中心处理器,控制器使用模型与视图渲染图结果,将结果返回给中心控制器,再将结果返回给请求者。
搭建环境
<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> <spring.version>5.0.2.RELEASE</spring.version> </properties> <dependencies> <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> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> </dependencies>
<servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 加载Spring的配置文件--> <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> <!-- 发送任何请求都会经过Servlet--> <url-pattern>/</url-pattern> </servlet-mapping> <!-- springMVC自带过滤器--> <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>
<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> </beans>
<!-- 开启注解扫描--> <context:component-scan base-package="cn.imut"/>
<!-- 视图解析器--> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 文件所在目录--> <property name="prefix" value="/WEB-INF/jsp/"/> <!-- 文件的后缀名--> <property name="suffix" value=".jsp"/> </bean>
<!-- 开启SpringMVC注解支持--> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
编写程序
//控制器 @Controller public class HelloController { @RequestMapping(path = "/hello") public String sayHello() { System.out.println("Hello StringMVC!"); return null; } }
SpringMVC框架基于组件方式执行流程
//定义控制器 //注意点:不要导错包,实现Controller接口,重写方法; public class ControllerTest1 implements Controller { public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception { //返回一个模型视图对象 ModelAndView mv = new ModelAndView(); mv.addObject("msg","Test1Controller"); mv.setViewName("test"); return mv; } }
<bean name="/t1" class="com.kuang.controller.ControllerTest1"/>
<!-- 自动扫描指定的包,下面所有注解类交给IOC容器管理 --> <context:component-scan base-package="com.kuang.controller"/>
//@Controller注解的类会自动添加到Spring上下文中 @Controller public class ControllerTest2{ //映射访问路径 @RequestMapping("/t2") public String index(Model model){ //Spring MVC会自动实例化一个Model对象用于向视图中传值 model.addAttribute("msg", "ControllerTest2"); //返回视图位置 return "test"; } }
概念
Restful就是一个资源定位及资源操作的风格。不是标准也不是协议,只是一种风格。基于这个风格设计的软件更简洁,更有层次,更易于实现缓存等机制。
功能
传统方式操作资源:通过不同的参数来实现不同的效果!方法单一,post和get
使用RESTful操作资源:可以通过不同的请求方式来实现不同的效果!如下:请求地址一样,但功能可以不同
@Controller public class ModelTest { @RequestMapping(path = "/m1/t1") public String test(Model model) { model.addAttribute("msg","ModelTest"); return "forward:/WEB-INF/jsp/test.jsp"; } }
@Controller public class ModelTest { @RequestMapping(path = "/m1/t1") public String test(Model model) { model.addAttribute("msg","ModelTest"); return "redirect:/index.jsp"; } }
提交的域名称和处理方法的参数名一致
提交的域名称和处理方法的参数名不一致
@GetMapping("/t1") public String test1(@RequestParam("name1") String name, Model model) { //1.接收前端参数 System.out.println("接收到前端的参数为:" + name); //2.将返回代结果传递给前端 model.addAttribute("msg",name); //3.跳转视图 return "test"; }
提交的是一个对象
@GetMapping("/t2") public String test2(User user) { System.out.println(user); return "test"; }
http://localhost:8080/springmvc_03_servlet_war_exploded/user/t2?id=1&name=q&age=1
Model、ModelMap、ModeAndView的区别
public class EncodingFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { servletRequest.setCharacterEncoding("utf-8"); servletResponse.setCharacterEncoding("utf-8"); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { } }
<filter> <filter-name>encoding</filter-name> <filter-class>cn.imut.filter.EncodingFilter</filter-class> </filter> <filter-mapping> <filter-name>encoding</filter-name> <!-- 过滤所有的请求--> <url-pattern>/*</url-pattern> </filter-mapping>
@Controller public class EncodingController { //过滤器解决乱码 @PostMapping("/e/t1") public String test1(String name, Model model) { model.addAttribute("msg",name); return "test"; } }
<!-- springMVC自带过滤器--> <filter> <filter-name>encoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>eccoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
后端部署后端,提供接口:提供接口
? JSON
前端独立部署,负责渲染后端的数据:
JSON(JavaScript Object Notation,JS 对象标记)是一种轻量级的数据交换格式
JSON采用完全独立于编程语言的文本格式来存储和表示数据
简洁和清晰的层次结构使得JSON成为理想的数据交换语言
易于人阅读和编写,同时也易于机器解析和生成。并有效的提升网络传输效率
在JavaScript语言中,一切都是对象。因此,任何JavaScript支持的类型都可以通过JSON来表示,例如字符串、数字、对象、数组等。
JSON键值对是用来保存JavaScript对象的一种方式,和JavaScript对象的写法也大同小异,键/值对组合中的键名写在前面并用双引号 "" 包裹,使用冒号:分隔,然后紧接着值:
{"name": "Qinjiang"} {"age": "3"} {"sex": "男"}
JSON和JavaScript对象的关系
var obj = {a: 'hello', b: 'world'}; //对象 var json = '{"a" : "Hello", "b": "world"}'; //JSON字符串
JSON和JavaScript对象互转
var obj = JSON.parse('{"a": "hello, "b": "world"}'); //结果为 " "
var json = JSON.stringify({a: 'hello', b: 'world'}); //结果为 ' '
<script type="text/javascript"> //编写一个JavaScript对象 var user = { name : "张磊", age : 3, sex: "男" }; //将js对象转换为JSON对象 var json = JSON.stringify(user); console.log(json); console.log("================"); //将JSON对象转换为JavaScript对象 var obj = JSON.parse(json); console.log(obj) </script>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.10.2</version> </dependency>
<!-- JSON乱码--> <mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <property name="supportedMediaTypes"> <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> <property name="failOnEmptyBeans" value="false"/> </bean> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>
@Controller public class UserController { @RequestMapping("/j1") @ResponseBody //不会走视图解析器,直接返回一个字符串 public String json1() throws JsonProcessingException { //jackson, ObjectMapper ObjectMapper mapper = new ObjectMapper(); //创建一个对象 User user = new User("张磊",22,"男"); String s = mapper.writeValueAsString(user); return s; } }
fastjson.jar是阿里开发的一款专门用于Java开发的包,可以方便的实现json对象与JavaBean对象的转换,实现JavaBean对象与json字符串的转换,实现json对象与json字符串的转换。实现json的转换方法很多,最后的实现结果都是一样的。
依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.60</version> </dependency>
System.out.println("*******Java对象 转 JSON字符串*******"); String str1 = JSON.toJSONString(list); System.out.println("JSON.toJSONString(list)==>"+str1); String str2 = JSON.toJSONString(user1); System.out.println("JSON.toJSONString(user1)==>"+str2); System.out.println("\n****** JSON字符串 转 Java对象*******"); User jp_user1=JSON.parseObject(str2,User.class); System.out.println("JSON.parseObject(str2,User.class)==>"+jp_user1); System.out.println("\n****** Java对象 转 JSON对象 ******"); JSONObject jsonObject1 = (JSONObject) JSON.toJSON(user2); System.out.println("(JSONObject) JSON.toJSON(user2)==>"+jsonObject1.getString("name")); System.out.println("\n****** JSON对象 转 Java对象 ******"); User to_java_user = JSON.toJavaObject(jsonObject1, User.class); System.out.println("JSON.toJavaObject(jsonObject1, User.class)==>"+to_java_user);
use `ssmbuild`; create table books ( `bookID` int(10) not null auto_increment comment '书id', `bookName` varchar(100) not null comment '书名', `bookCounts` int(11) not null comment '数量', `detail` varchar(200) not null comment '描述', key `bookID` (`bookID`) )engine = InnoDB default charset = utf8; insert into books values (1,'Java',1,'从入门到放弃'), (2,'MySQL',10,'从删库到跑路'), (3,'Linux',5,'从进门到进牢'); select * from books;
<dependencies> <!-- 依赖:junit,数据库驱动,连接池,servlet,jsp,mybatis,mybatis-spring,spring--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.5</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <!-- https://mvnrepository.com/artifact/javax.servlet/jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.3</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.3</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.3.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.3.RELEASE</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> </dependency> </dependencies> <!-- 静态资源导出--> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build>
jdbc.url = jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <!-- 核心配置文件--> <configuration> <!-- 配置数据源,交给Spring去做--> <!-- 别名--> <typeAliases> <package name="cn.imut.pojo"/> </typeAliases> <mappers> <mapper resource="cn/imut/dao/BookMapper.xml"/> </mappers> </configuration>
spring-dao.xml
<?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" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"> <!-- 1.关联数据库配置文件--> <context:property-placeholder location="classpath:database.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!-- 3.配置SqlSessionFactory对象 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="dataSource"/> <!-- 配置Mybatis全局配置文件:mybatis-config.xml --> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> <!-- 4.配置dao接口扫描包,动态的实现Dao接口可以注入到Spring容器中--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 注入 sqlSessionFactory--> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!-- 扫描dao包--> <property name="basePackage" value="cn.imut.dao"/> </bean> </beans>
spring-service.xml
<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 扫描service下的包--> <context:component-scan base-package="cn.imut.service"/> <!-- 将业务类注入--> <bean id="bookServiceImpl" class="cn.imut.service.Impl.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <!-- 声明式事务--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据源--> <property name="dataSource" ref="dataSource"/> </bean> <!-- aop横切事务--> </beans>
spring-mvc.xml
<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 注解驱动--> <mvc:annotation-driven/> <!-- 静态资源过滤--> <mvc:default-servlet-handler/> <!-- 扫描包--> <context:component-scan base-package="cn.imut.controller"/> <!-- 视图解析器--> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 文件所在目录--> <property name="prefix" value="/WEB-INF/JSP/"/> <!-- 文件的后缀名--> <property name="suffix" value=".jsp"/> </bean> </beans>
applicationContext.xml
<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <import resource="classpath:spring-dao.xml"/> <import resource="classpath:spring-service.xml"/> <import resource="classpath:spring-mvc.xml"/> </beans>
文件上传是项目开发中最常见的功能之一 ,springMVC 可以很好的支持文件上传,但是SpringMVC上下文中默认没有装配MultipartResolver,因此默认情况下其不能处理文件上传工作。如果想使用Spring的文件上传功能,则需要在上下文中配置MultipartResolver。
前端表单要求:为了能上传文件,必须将表单的method设置为POST,并将enctype设置为multipart/form-data。只有在这样的情况下,浏览器才会把用户选择的文件以二进制数据发送给服务器;
<!--文件上传--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency> <!--servlet-api导入高版本的--> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> </dependency>
<!-- 文件上传--> <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="40968"/> </bean>
@RequestMapping("/upload") public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException { //获取文件名 : file.getOriginalFilename(); String uploadFileName = file.getOriginalFilename(); //如果文件名为空,直接回到首页! 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(); //文件输入流 OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件输出流 //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.Transto 来保存上传的文件 */ @RequestMapping("/upload2") 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(注意这个时候) file.transferTo(new File(realPath +"/"+ file.getOriginalFilename())); return "redirect:/index.jsp"; }