[Java知识库]详解：整合SSM

1.搭建spring

????????首先创建模板web模板

????????pom.xml文件，引入jar包

<properties>
  <spring.version>5.0.2.RELEASE</spring.version>
  <slf4j.version>1.6.6</slf4j.version>
  <log4j.version>1.2.12</log4j.version>
  <mysql.version>5.1.6</mysql.version>
  <mybatis.version>3.4.5</mybatis.version>
  <jackson.version>2.9.4</jackson.version>
</properties>
<dependencies>
  <!--spring-->
  <dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.6.8</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>${spring.version}</version>
  </dependency><dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>${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>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>${spring.version}</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>${spring.version}</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>${spring.version}</version>
  </dependency>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql.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>
  <dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
  </dependency>
  <!--log start-->
  <dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>${log4j.version}</version>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${slf4j.version}</version>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>${slf4j.version}</version>
  </dependency>
  <!-- log end-->
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>${mybatis.version}</version>
  </dependency>
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.0</version>
  </dependency>
  <!--连接池-->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version></dependency>
  <dependency>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-core</artifactId>
    <version>1.3.5</version>
  </dependency>
  <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>${jackson.version}</version>
  </dependency>
  <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>${jackson.version}</version>
  </dependency>
  <dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>5.1.10</version>
  </dependency>
  <dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.2.3</version>
  </dependency>
  <dependency>
      <groupId>org.thymeleaf</groupId>
      <artifactId>thymeleaf-spring4</artifactId>
      <version>3.0.9.RELEASE</version>
  </dependency>
</dependencies>
<build>
  <finalName>ssm</finalName>
  <pluginManagement>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.2</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
          <showWarnings>true</showWarnings>
        </configuration>
      </plugin>
    </plugins>
  </pluginManagement>
  <plugins>
    <plugin>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-maven-plugin</artifactId>
      <version>1.3.5</version>
      <!--告诉插件，配置文件所在的位置-->
      <configuration>
        <configurationFile>src/main/resources/mbg.xml</configurationFile>
        <verbose>true</verbose>
        <overwrite>true</overwrite>
      </configuration>
    </plugin>
  </plugins>
</build>

????????创建一个model包，在创建一个User实体类?

@Data
public class User {
    private Integer id;

    private String username ;

    private String password;

    private String sex;

    private Integer age;
}

????????创建一个service包，在创建一个UserService接口

@Service
public interface UserService {

    public List<User> findAll();
}

????????在service包下创建一个serviceImpl包，在其包下创建一个UserServiceImpl实现类

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;

    @Override
    public List<User> findAll(){
        System.out.println("我说service层");
        return this.userDao.findAll();
    }
}

????????在resources下创建一个spring.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"
       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 http://www.springframework.org/schema/context/spring-context.xsd">


    <!--开启对注解的扫描-->
    <context:component-scan base-package="com.qcby"></context:component-scan>


    <!--加载数据库配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置数据库连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--spring整合mybatis-->
    <bean id="SqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据库连接池-->
        <property name="dataSource" ref="dataSource"/>

        <!--扫描entity，配置entity包下类的别名-->
        <property name="typeAliasesPackage" value="com.qcby.model"/>


        <!--扫描sql配置文件，mapper文件夹中的xml文件-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--配置扫描Dao接口包，动态实现Dao接口，注入到ioc容器-->
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.qcby.dao"/>
    </bean>

</beans>

??

2.搭建SpringMvc

????????修改web.xml文件

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

    <!--不拦截所有是html的页面请求    下面的补充,就是如果是html不会打到DispatcherServlet中-->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>

    <!--用来表示我们想要访问的标签-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--当一旦有请求过来的时候，初始化springMvc-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:SpringMvc.xml</param-value>
        </init-param>
    </servlet>
    <!--标识号servlet地址-->
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
    <!--配置开启项目时打开的主页面-->
    <welcome-file-list>
        <welcome-file>/index.html</welcome-file>
    </welcome-file-list>

    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <async-supported>true</async-supported>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
<!--配置Spring的监听器-->
    <display-name>Archetype Created Web Application</display-name>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--配置加载类路径的配置文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:Spring.xml</param-value>
    </context-param>

</web-app>

????????创建一个index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<a href="/SSMTest/hello" >入门程序</a>
  <h1>我是主页面</h1>
</body>
</html>

????????在resources中创建一个SpringMVC.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">


    <!--开启对注解的扫描-->
    <context:component-scan base-package="com.qcby"></context:component-scan>

    <!--处理器映射器-->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <!--处理器适配器-->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

    <!--配置视图解析器-->
    <bean id="viewResolver" class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine" ref="templateEngine"/>
    </bean>
    <!-- templateEngine -->
    <bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine">
        <property name="templateResolver" ref="templateResolver"/>
    </bean>
    <bean id="templateResolver" class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
        <!--目录-->
        <property name="prefix" value="/html/" />
        <!--后缀名-->
        <property name="suffix" value=".html" />
        <property name="templateMode" value="HTML5"/>
    </bean>

    <!-- 配置spring开启注解mvc的支持  默认就是开启的 ，要想让其他组件（不包含映射器、适配器、处理器）生效就必须需要配置了-->
    <mvc:annotation-driven/>
</beans>

????????创建一个controller包，里面创建一个UserController类（相当于servlet）

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    //每个方法也叫作处理器
    /*@RequestMapping("/run")
    public void run(){

    }*/


    /**
     * 处理超链接发出来的请求
     *
     * @param model 模型
     * @return {@link String}
     */
    @RequestMapping(path = "/hello")
    public String sayHello(Model model){
        System.out.println("方法执行了。。。。");
        List<User> accounts = userService.findAll();
        for (User user:accounts
             ) {
            System.out.println(user.toString());
        }
        model.addAttribute("msg","hello,springmvc");
        return "suc";
    }

}

????????在webapp下创建一个包html，除了index.html，其他所有的html都要放在这个包下，所以在里面创建suc.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>进入</title>
</head>
<body>
<h1>Hello<b th:text="${msg}"></b></h1>
</body>
</html>

.3.整合mybatis

????????先创建一个jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_demo?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=false
jdbc.username=root
jdbc.password=123456

????????创建dao层，创建一个dao包，创建一个UserDao类

public interface UserDao {
    public List<User> findAll();
}

????????在resources创建一个mapper包，在其下创建一个UserDao.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qcby.dao.UserDao">

    <select id="findAll" resultType="com.qcby.model.User">
        select * from User;
    </select>

</mapper>

????????

?