详细速成"/>
SSM详细速成
ssm速成
此文对狂神说ssm整合 进行解读
mybatis 学习+测试
pojo.Books
@AllArgsConstructor
@NoArgsConstructor
@Data
public class Books {private int bookId;private String bookName;private int bookCounts;private String detail;
}
mybatis.xml核心文件
- 设置连接用户名密码
- 要访问的数据库名字
- 关联映射文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN"".dtd">
<configuration><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments>
<!--关联mapper映射文件--><mappers><mapper resource="com/oxt/dao/BookMapper.xml"/></mappers>
</configuration>
编写dao.BookMapper接口
public interface BookMapper {public void addBook(Books books);public void deleteBookById(int id);public void updateBook(Books books);public List<Books> getAllBooks();
}
实现接口,编写映射文件BookMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"".dtd"><mapper namespace="com.oxt.dao.BookMapper"><select id="allBooks" resultType="com.oxt.pojo.Books">select * from books</select> <!--大小写不敏感--><update id="updateBook" parameterType="com.oxt.pojo.Books">update ssmbuild.booksset bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}where BOOKID=#{bookId}</update><!--这里的参数可以随便#{}--><delete id="deleteBookById" parameterType="int">delete from ssmbuild.bookswhere BoOkID=#{s}</delete><!--这里的参数 不 能随便#{}--><insert id="addBook" parameterType="com.oxt.pojo.Books">insert into ssmbuild.books(bookName,bookCounts,detail)values(#{bookName},#{bookCounts},#{detail})</insert></mapper>
工具类
public class MybatisUtils {private static SqlSessionFactory sqlSessionFactory;static {try {String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);} catch (IOException e) {e.printStackTrace();}}//获取SqlSession连接public static SqlSession getSession(){return sqlSessionFactory.openSession();}}
编写测试类
public class MyTest {@Testpublic void selectUser() {SqlSession session = MybatisUtils.getSession();//方法一:
// List<Books> books = session.selectList("com.oxt.dao.BookMapper.allBooks");//方法二:BookMapper mapper = session.getMapper(BookMapper.class);List<Books> books = mapper.getAllBooks();for (Books book: books){System.out.println(book);}// mapper.addBook(new Books(5,"老人与海",5,"good"));mapper.deleteBookById(13);
// mapper.updateBook(new Books(13,"老人与海",2222,"better"));session.commit();session.close();}
}
- 创建sqlsessionfactory
- 打开session会话,获取sqlSession连接
- session获取mapper
小结:
- 所有的增删改操作都需要提交事务!
- 接口所有的普通参数,尽量都写上@Param参数,尤其是多个参数时,必须写上!
- 有时候根据业务的需求,可以考虑使用map传递参数!
- 为了规范操作,在SQL的配置文件中,我们尽量将Parameter参数和resultType都写上!
spring-mybatis 整合
导入依赖
- spring
- spring-jdbc操作数据库
- aop植入器
- mybatis-spring整合包
<!--spring相关--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.1.10.RELEASE</version></dependency>
<!-- spring操作数据库--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.1.10.RELEASE</version></dependency>
<!--aspectJ AOP植入器-->
<!-- .aspectj/aspectjweaver --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version></dependency>
<!--mybatis-spring整合包--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.2</version></dependency>
beans.xml
- 数据源,可以是spring自带,c3p0等
- 注入SQLsessionfactory,无需new;并关联mybatis(SQLsessionfactory需要数据源作为参数)
- 注入SQLSessionTemplate,即sqlSession
- 注入bookMapper的实现,该实现类中直接使用sqlSession
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xmlns:aop=""xsi:schemaLocation="://www.springframework.org/schema/beans/spring-beans.xsd://www.springframework.org/schema/aop/spring-aop.xsd">
<!--数据源--><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8"/><property name="username" value="root"/><property name="password" value="root"/></bean><!--sqlSessionFactory--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"/><!--关联Mybatis--><property name="configLocation" value="classpath:mybatis-config.xml"/></bean>
<!--SqlSessionTemplate需要用构造方法注入sqlSessionFactory--><bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!-- 无set方法,只能--><constructor-arg index="0" ref="sqlSessionFactory"/></bean><bean id="bookMapper" class="com.oxt.dao.BookDaoImp"><property name="sqlSession" ref="sqlSession"/></bean></beans>
mybatis-config.xml
<typeAliases><package name="com.oxt.pojo"/></typeAliases><mappers>
<!-- <mapper class="com.oxt.dao.BookMapper"/>--><package name="com.oxt.dao"/></mappers>
BookDaoImp
package com.oxt.dao;import com.oxt.pojo.Books;
import org.mybatis.spring.SqlSessionTemplate;import java.util.List;public class BookDaoImp implements BookMapper {//sqlSession不用我们自己创建了,Spring来管理private SqlSessionTemplate sqlSession;public void setSqlSession(SqlSessionTemplate sqlSession) {this.sqlSession = sqlSession;}@Overridepublic void addBook(Books books) {BookMapper mapper=sqlSession.getMapper(BookMapper.class);mapper.addBook(books);sqlSession.commit();}@Overridepublic void deleteBookById(int id) {BookMapper mapper=sqlSession.getMapper(BookMapper.class);mapper.deleteBookById(id);sqlSession.commit();}@Overridepublic void updateBook(Books books) {BookMapper mapper=sqlSession.getMapper(BookMapper.class);mapper.updateBook(books);sqlSession.commit();}@Overridepublic List<Books> getAllBooks() {BookMapper mapper = sqlSession.getMapper(BookMapper.class);return mapper.getAllBooks();}
}
测试
@Test
public void test(){ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");BookMapper mapper = (BookMapper) context.getBean("bookMapper");List<Books> book = mapper.getAllBooks();System.out.println(book);
}
SpringMVC
网页请求与处理过程:
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-
http请求—>Tomcat从磁盘加载servlet
-
Tomcat将http请求转化为request请求对象
-
相应的servlet处理该request请求:转发,重定向,转发即反馈数据,重定向即切换页面
-
tomcat将response转化为http相应
MVC
- Model模型:dao,service 数据模型.
- view 视图jsp
- controller 控制器Servlet,负责接收用户请求和返回响应
典型mvc:javaBean+jsp+servlet
MVC框架要做哪些事情
- 将url映射到java类或 java类的方法.
- 封装用户提交的数据.
- 处理请求–调用相关的业务处理–封装响应数据.
- 将响应的数据进行渲染. jsp/html等表示层数据
Servlet
准备依赖
- servlet
- jsp
<dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version>
</dependency>
<dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2</version>
</dependency>
配置web.xml,处理http请求
- 配置处理请求的servlet
- 配置路径处理的mapping
<servlet><servlet-name>com.oxt.servlet.HelloServlet</servlet-name><servlet-class>com.oxt.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping><servlet-name>com.oxt.servlet.HelloServlet</servlet-name><url-pattern>/user</url-pattern>
</servlet-mapping>
编写servlet,处理request请求
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String method = req.getParameter("method");//获取参数if(method.equals("add")){req.getSession().setAttribute("msg","执行了add方法");}else{req.getSession().setAttribute("msg","没执行add");}req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req,resp);//视图跳转
}@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);
}
第一个SpringMVC
配置开发
web.xml
- 同上web.xml,但是servlet变成了DispatcherServlet
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns=""xmlns:xsi=""xsi:schemaLocation=" .xsd"version="5.0"><!--1.注册DispatcherServlet--><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--关联一个springmvc的配置文件:【servlet-name】-servlet.xml--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc-servlet.xml</param-value></init-param><!--启动级别-1--><load-on-startup>1</load-on-startup></servlet><!--/ 匹配所有的请求;(不包括.jsp)--><!--/* 匹配所有的请求;(包括.jsp)--><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>
关联的springmvc-servlet.xml
- 处理器
- 处理器适配器
- 视图解析器
- 请求处理类映射
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xsi:schemaLocation="://www.springframework.org/schema/beans/spring-beans.xsd">
<!--处理器映射--><bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<!--处理器适配器--><bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/><!--视图解析器:DispatcherServlet给他的ModelAndView--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver"><!--前缀--><property name="prefix" value="/WEB-INF/jsp/"/><!--后缀--><property name="suffix" value=".jsp"/></bean><!--Handler--><bean id="/hello" class="com.oxt.controller.HelloController"/></beans>
- hello请求从xx-servlet.xml转到相应的处理器
public class HelloController implements Controller {public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {//ModelAndView 模型和视图ModelAndView mv = new ModelAndView();//封装对象,放在ModelAndView中。Modelmv.addObject("msg","HelloSpringMVC!");//封装要跳转的视图,放在ModelAndView中mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jspreturn mv;}
}
- 实现接口,导入接口的包org.springframework.web.servlet.mvc.Controller;
注解开发
web.xml
- 注册DispatcherServlet
<servlet><servlet-name>SpringMVChere</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--关联springmvc配置文件--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc-servlet.xml</param-value></init-param><!--启动顺序,数字越小,启动越早--><load-on-startup>1</load-on-startup>
</servlet>
- 设置springmvc拦截请求
<servlet-mapping><servlet-name>SpringMVChere</servlet-name><url-pattern>/</url-pattern>
</servlet-mapping>
12成双
resources下建立springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xmlns:context=""xmlns:mvc=""xsi:schemaLocation="://www.springframework.org/schema/beans/spring-beans.xsd://www.springframework.org/schema/context/spring-context.xsd://www.springframework.org/schema/mvc/spring-mvc.xsd">
- 自动扫描包:该包下的
注解
生效,由IOC容器管理
<context:component-scan base-package="com.oxt.controller"/>
- 不让SpringMVC处理静态资源
在 WEB 容器启动的时候会在上下文中定义一个 DefaultServletHttpRequestHandler,它会对DispatcherServlet的请求进行处理,如果该请求已经作了映射,那么会接着交给后台对应的处理程序,如果没有作映射,就交给 WEB 应用服务器默认的 Servlet 处理,从而找到对应的静态资源,只有再找不到资源时才会报错。点击查看原文
如果想要解决访问静态资源问题,通常会使用默认handler:
<mvc:default-servlet-handler />
3.处理器和适配器
<mvc:annotation-driven /><!--支持mvc注解驱动在spring中一般采用@RequestMapping注解来完成映射关系要想使@RequestMapping注解生效必须向上下文里注册DefaultAnnotationHandlerMapping和一个AnnotationMethodHandlerAdapter实例这两个实例分别在 类级别和 方法级别 处理。而annotation-driven配置帮助我们自动完成上述两个实例的注入。-->
- 视图解析器
<!-- 3.配置jsp 显示ViewResolver视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /><property name="prefix" value="/WEB-INF/jsp/" /><property name="suffix" value=".jsp" />
</bean>
com.oxt.controller.HelloController
@Controller
@RequestMapping("/helloController")//类请求
public class HelloController{@RequestMapping("hello")pubulic String helloC(Model model){model.addAttribute("msg","hello,you,how");return "hello";//返回页面 视图解析加上前后缀:/WEB-INF/jsp/hello.jsp}
}
hello.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>SpringMVC</title>
</head>
<body>
${msg}
</body>
</html>
小结
实现步骤其实非常的简单:
- 新建一个web项目
- 导入相关jar包
- 编写web.xml , 注册DispatcherServlet
- 编写springmvc配置文件
- 接下来就是去创建对应的控制类 , controller
- 最后完善前端视图和controller之间的对应
- 测试运行调试.
使用springMVC必须配置的三大件:
处理器映射器、处理器适配器、视图解析器
通常,我们只需要手动配置视图解析器,而处理器映射器和处理器适配器只需要开启注解驱动即可,而省去了大段的xml配置
web.xml中的dispatchcer servlet用的spring总文件
spring总文件中import三层文件:springmvc,dao,service
springdao.xml中:数据源,sqlSessionFactory,
SSM整合
导入依赖
sprig+mybatis
1.编写pojo
2.编写mapper类和映射文件
3.编写service层
编写配置文件
1.spring总文件applicationContext.xml:import三层的xml文件,实际上就是一个spring文件
2.spring-dao.xml
在spring-mybatis中,用factory获取sqlsession,factory需要映射文件作为参数,sqlsession获取相应的mapper类 然后增删改查操作
- 引入database.properties
标签为<context:property-placeholder location="classpath:database.properties"/>
ssm加上classpath:才正常运行,仅用于spring-mybatis可以不加 - bean:dataSource
- bean:SQLSessionFactory ,需要注入映射文件mybatis
(mybatis文件中设置别名typeAliases 以及mappers标签中设置映射文件位置) - bean:配置class MapperScannerConfigurer 需要注入sqlsessionfactory
扫描dao层的类,自动注册各个mapper类的bean
3.spring-service.xml
- import spring-dao
- 扫描service层
- bean:serviceImp
- bean:事务管理器
spring+springmvc
idea中要注意在web文件夹中添加lib依赖
web.xml
1.servlet 指定总spring配置文件
2.servlet-mapping 指定/请求处理的servlet↑
3.filter拦截请求
4.session过期时间
conroller层类编写
1.@Controller标记
2.RequestMapping,类中和方法上
3.bean:bookService 使用@AutoWired和@Qualifier指定
3.编写各个请求的处理方法 String name(Model model){return jsp页面}
4.编写相应的jsp
spring-mvc.xml
1.注解驱动
2.静态视图资源 使用默认servlet
3.视图解析 前后缀
4.扫描controller包
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SSM详细速成
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