y1s1 SSM yyds！
构建基本项目结构：
java：pojo dao service controller
resources：mybatis-config.xml,database.properties,applicationContext.xml,spring-dao.xml,spring-service.xml,spring-mvc.xml…
配置Tomcat
隐藏的注意点：
在执行前，将项目所需要的Jar包加入l项目ib文件中，否则会出现404错误。
访问出现404，排查步骤：
查看控制台输出，看一下是不是缺少了什么jar包。如果jar包存在，显示无法输出，就在IDEA的项目发布中，添加lib依赖！重启Tomcat 即可解决！编写数据库配置文件database.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=12345这里的名字必须要是jdbc.xx
IDEA中关联数据库 MySQL版本过高需要设置时区：
serverTimeZone：UTC/GMT/Asian/Shanghai
编写Mybatis核心配置文件：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"> <configuration> <!--数据源配置交由spring整合--> <settings> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings> <!--别名--> <typeAliases> <package name="com.shl.pojo"/> </typeAliases> <!--映射--> <mappers> <package name="com.shl.dao"/> </mappers> </configuration>编写实体类pojo，对应数据库的字段来写。
import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @NoArgsConstructor @AllArgsConstructor public class Books { private int bookID; private String bookName; private int bookCounts; private String detail; }编写dao层的mapper接口
注意：注释和@Param注解
public interface BookMapper { /** * 增加一本书 * @param books * @return */ int addBook(Books books); /** * 根据编号删除书 * @param id * @return */ int deleteBookByID(@Param("bookID") int id); /** * 更新一本书 * @param books * @return */ int updateBook(Books books); /** * 根据编号查找书 * @param id * @return */ Books queryBookByID(@Param("bookID") int id); /** * 查询所有的书 * @return */ List<Books> qureryAllBooks(); /** * 根据书名查询图书 * @return */ Books queryBookByName(@Param("bookName") String bookName); }编写dao层mapper接口对应的mapper.xml文件
注意：namespace需要绑定接口，并且到mybatis核心配置文件中配置映射
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.shl.dao.BookMapper"> <insert id="addBook" parameterType="Books"> insert into ssmbuild.books (bookName, bookCounts, detail) VALUES (#{bookName},#{bookCounts},#{detail}); </insert> <update id="updateBook" parameterType="Books"> update ssmbuild.books set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail} where bookID = #{bookID}; </update> <delete id="deleteBookByID" parameterType="integer"> delete from ssmbuild.books where bookID = #{bookID}; </delete> <select id="queryBookByID" resultType="Books"> select * from ssmbuild.books where bookID = #{bookID}; </select> <select id="qureryAllBooks" resultType="Books"> select * from ssmbuild.books; </select> <select id="queryBookByName" resultType="Books"> select * from ssmbuild.books where bookName = #{bookName}; </select> </mapper>编写Service层接口与实现类
Service层就是来调用dao层的，需要新建一个对象在里面。
public interface BookService { /** * 增加一本书 * @param books * @return */ int addBook(Books books); /** * 根据编号删除书 * @param id * @return */ int deleteBookByID(int id); /** * 更新一本书 * @param books * @return */ int updateBook(Books books); /** * 根据编号查找书 * @param id * @return */ Books queryBookByID(int id); /** * 查询所有的书 * @return */ List<Books> qureryAllBooks(); /** * 根据书名查询图书 * @return */ Books queryBookByName(String bookName);Service层接口具体实现类：注意 要调用dao层的具体方法！！
@Service public class BookServiceImpl implements BookService { //Service层调dao层 组合dao private BookMapper bookMapper; //set方法 spring注入 public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper; } @Override public int addBook(Books books) { return bookMapper.addBook(books); } @Override public int deleteBookByID(int id) { return bookMapper.deleteBookByID(id); } @Override public int updateBook(Books books) { return bookMapper.updateBook(books); } @Override public Books queryBookByID(int id) { return bookMapper.queryBookByID(id); } @Override public List<Books> qureryAllBooks() { return bookMapper.qureryAllBooks(); } @Override public Books queryBookByName(String bookName) { return bookMapper.queryBookByName(bookName); } }Spring层在整合的过程中就可以理解成为一个大杂烩，一个容器，用于连接前后端的一个组件。
把Mybatis整合到Spring中，数据源使用c3p0连接池（dbcp,spring自带的,druid…）编写spring-dao.xml：spring整合dao层 <?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!-- 1.关联数据库配置文件--> <context:property-placeholder location="classpath:database.properties"/> <!-- 2.连接池--> <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}"/> <!--c3p0连接池的私有属性--> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <!-- 关闭连接后不自动commit --> <property name="autoCommitOnClose" value="false"/> <!-- 获取连接超时时间 --> <property name="checkoutTimeout" value="10000"/> <!-- 当获取连接失败重试次数 --> <property name="acquireRetryAttempts" value="2"/> </bean> <!-- 3.sqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="datasource"/> <!--绑定Mybatis的配置文件--> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> <!-- 4.配置dao接口扫描包,动态实现了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"/> <!-- 要扫描的dao包--> <property name="basePackage" value="com.shl.dao"/> </bean> </beans>具体步骤：
关联数据库配置文件—>连接池datasource的相关配置—>sqlSessionFactory---->sqlSession(可 以省略)—>dao层接口动态扫描包注入。
编写spring-service.xml：spring整合service层 <?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!-- 扫描service下的注解--> <context:component-scan base-package="com.shl.service"/> <!-- 将所有业务层实现类注入到spring 用注解或配置实现--> <bean class="com.shl.service.BookServiceImpl" id="BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <!-- 声明式事务配置--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据源--> <property name="dataSource" ref="datasource"/> </bean> <!-- AOP横切 事务支持--> </beans>AOP与声明式事务还需要再复习一遍Spring！
1.给Maven项目添加web项目支持
项目名右键add framework–web2.配置web.xml
流程：dispatchServlet–SpringMVC自带乱码过滤器–默认Session过期时间
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!-- dispatcherServlet--> <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:applicationContext.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> <!-- springmvc乱码过滤--> <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> <!-- 默认session过期时间--> <session-config> <session-timeout>15</session-timeout> </session-config> </web-app> <param-value>classpath:applicationContext.xml</param-value> 注意:这里加载的是总的配置文件applicationContext.xml！
3.编写Spring-mvc.xml：spring整合controller层
流程：注解驱动–静态资源过滤–扫描web相关的包下的bean–视图解析器
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" 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 https://www.springframework.org/schema/context/spring-context.xsd"> <!-- 注解驱动 mvc包下的--> <mvc:annotation-driven/> <!-- 静态资源过滤--> <mvc:default-servlet-handler/> <!-- 扫描controller包--> <context:component-scan base-package="com.shl.controller"/> <!-- 视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>4.Spring整合总的配置文件：applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" 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"> <import resource="classpath:spring-dao.xml"/> <import resource="classpath:spring-service.xml"/> <import resource="classpath:spring-mvc.xml"/> </beans>注意：这4个配置文件都需要放在一起！
controller层调用service层！
1.编写Controller类
里面包括了以下方法：
查询全部图书添加图书修改图书删除图书根据书名查找图书需要注意的是 传入的参数名称 需要与前端保持一致！
@Controller @RequestMapping("/book") public class BookController { //controller层调service层 @Autowired @Qualifier("BookServiceImpl") private BookService bookService; public void setBookService(BookService bookService) { this.bookService = bookService; } //查询全部书 并返回一个图书展示页面 @RequestMapping("/allBook") public String queryAllBooks(Model model) { List<Books> books = bookService.qureryAllBooks(); model.addAttribute("books",books); return "allBook"; } //跳转到增加图书页面 @RequestMapping("/toAddBook") public String toAddBook() { return "addBook"; } //添加图书的需求 @RequestMapping("/addBook") public String addBook(Books books) { bookService.addBook(books); //重定向到/allBook请求 return "redirect:/book/allBook"; } //跳转到修改图书页面 @RequestMapping("/toUpdateBook") public String toUpdateBook(int id,Model model) { Books books = bookService.queryBookByID(id); model.addAttribute("querybook",books); return "updateBook"; } //修改图书 @RequestMapping("/updateBook") public String updateBook(Books books) { System.out.println("updateBook=>" + books); bookService.updateBook(books); return "redirect:/book/allBook"; } //删除图书(restful风格骚操作。。) @RequestMapping("/deleteBook/{bookID}") public String deleteBook(@PathVariable("bookID") int id) { bookService.deleteBookByID(id); return "redirect:/book/allBook"; } //查询书籍 @RequestMapping("/queryBook") public String queryBook(String queryBookName,Model model) { Books book = bookService.queryBookByName(queryBookName); ArrayList<Books> books = new ArrayList<>(); books.add(book); model.addAttribute("books",books); return "allBook"; } }2.具体前端页面
index.jsp 首页 <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>首页</title> <style type="text/css"> a { text-decoration: none; color: black; font-size: 18px; } h3 { width: 180px; height: 38px; margin: 100px auto; text-align: center; line-height: 38px; background: deepskyblue; border-radius: 4px; } </style> </head> <body> <h3> <%-- 这里是请求跳转的url--%> <a href="${pageContext.request.contextPath}/book/allBook">进入图书展示页面</a> </h3> </body> </html> 所有图书展示allBook.jsp <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>图书展示</title> <%-- BootStrap美化界面--%> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- 引入 Bootstrap --> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>图书列表 —— 显示所有图书</small> </h1> </div> </div> </div> <div class="row"> <div class="col-md-4 column"> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增图书</a> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部图书</a> </div> <%-- <div class="col-md-4 column"></div>--%> <div class="col-md-8 column"> <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right"> <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的图书名称"> <input type="submit" value="查询" class="btn btn-primary"> </form> </div> </div> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>图书编号</th> <th>图书名字</th> <th>图书数量</th> <th>图书详情</th> <th>操作</th> </tr> </thead> <%-- 数据从数据库拉过来 从list中遍历出来： c foreach--%> <tbody> <c:forEach var="book" items="${books}"> <tr> <td>${book.getBookID()}</td> <td>${book.getBookName()}</td> <td>${book.getBookCounts()}</td> <td>${book.getDetail()}</td> <td> <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> | <a href="${pageContext.request.contextPath}/book/deleteBook/${book.getBookID()}">删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div> </body> </html>用a标签时，需要用pageContext.request.contextPath表名当前的项目名虚拟映射路径
添加图书 addBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>新增书籍</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- 引入 Bootstrap --> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>新增书籍</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/addBook" method="post"> 书籍名称：<input type="text" name="bookName" required><br><br><br> 书籍数量：<input type="text" name="bookCounts" required><br><br><br> 书籍详情：<input type="text" name="detail" required><br><br><br> <input type="submit" value="添加"> </form> </div> </body> </html>修改图书页面 updateBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>修改图书</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- 引入 Bootstrap --> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>修改图书信息</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/updateBook" method="post"> <%--隐藏域传入ID--%> <input type="hidden" name="bookID" value="${querybook.getBookID()}"/> 书籍名称：<input type="text" name="bookName" value="${querybook.getBookName()}" required/> 书籍数量：<input type="text" name="bookCounts" value="${querybook.getBookCounts()}" required/> 书籍详情：<input type="text" name="detail" value="${querybook.getDetail() }" required/> <input type="submit" value="提交"/> </form> </div> </body> </html>7.2日第一次完成了SSM整合，之后学习SpringBoot和前端知识，有空把Mybatis和Spring复习一遍。
