Spring之 SSM学习笔记

其他 2020-01-14 17:46:19 阅读次数: 0

原来setting.xml中的<mirror>:

 <mirror>
      <id>mirrorId</id>
      <mirrorOf>repositoryId</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://my.repository.com/repo/path</url>
    </mirror>

首先，新建工程：
需要勾选Create from archetypy，并选择其中的webapp:
在这里插入图片描述
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这样就能通过用阿里云的那个maven repository。
在这里插入图片描述改变项目结构为：
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还需要再Project structure中添加“web”:
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在Artifacts中修改输出目录为Tomcat下的webapps：

将SpringMVC与Mybatis进行整合：
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首先，在pom.xml中添加需要用到的依赖：Spring相关core,context,aop，beans，web，web-mvc、jsp、servlet、jstl、el、mybatis、mybatis-core、DBCP(数据源)、SpringJDBC、Spring_tx,weaver(面向切面)、log4j、mybatis-spring整合用。

还需要db.properties，log4j.properties、applicationContext.xml（controller，service，mapper）。
因为是web项目，还需要在<build>中添加：（如果不是web，只是普通的Mybatis或者MVC Spring，就不需要加<resources>）

<resources>
              <resource>
      <directory>src/main/resources</directory>
                  <includes>
                  <include>**/*.xml</include>
                  <include>**/*.properties</include>
                  </includes>
              </resource>
          <resource>
              <directory>src/main/java</directory>
              <includes>
                  <include>**/*.xml</include>
                  <include>**/*.properties</include>
              </includes>
          </resource>
      </resources>

pom.xml如下：

<?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.bit</groupId>
  <artifactId>mySSMdemo</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>mySSMdemo 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>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>

    <!--
     classpath: webapp  http://localhost:8080/

     spring:
     core,context,aop,beans,web,web-mvc
     jsp,servlet,jstl,el
     mybatis:
     mybatis-core
     DB:
      mysql 5.1.38
      DBCP(数据源)
      spring_jdbc
      spring_tx
      weaver(切面)
      log4j.jar
   -->

    <!--
      文件：
       db.properties
       log4j.properties
        applicationContext-controller.xml
        applicationContext-service.xml
        applicationContext-mapper.xml
        .
        .
        .
         sqlMapConfig.xml
         xxMapper.xml
    -->

    <!--
      mybatis+spring .Jar
    -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>


    <!--*****************************spring *******************************************-->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.2</version>
      <scope>provided</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!--********************************jsp + servlet + jstl + el**************************-->

    <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </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>
      <scope>provided</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.el/javax.el-api -->
    <dependency>
      <groupId>javax.el</groupId>
      <artifactId>javax.el-api</artifactId>
      <version>3.0.0</version>
    </dependency>
    <!--*****************************mybatis + spring ****************************************-->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.1</version>
    </dependency>



    <!--**********************************mybatis********************************************-->

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.1</version>
    </dependency>

    <!--*************************************MYSQL   +   DBCP************************************************-->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.4</version>
    </dependency>

    <!--********************************************log4j***********************************************-->
    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!--**********************************************JUnit4******************************************-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!--*****************************ASPectJ***************************************************-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.7.2</version>
    </dependency>
  </dependencies>


  <build>
    <finalName>mySSMdemo</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>

      <resources>
              <resource>
      <directory>src/main/resources</directory>
                  <includes>
                  <include>**/*.xml</include>
                  <include>**/*.properties</include>
                  </includes>
              </resource>
          <resource>
              <directory>src/main/java</directory>
              <includes>
                  <include>**/*.xml</include>
                  <include>**/*.properties</include>
              </includes>
          </resource>
      </resources>

  </build>
</project>

从下往上进行整合，先是持久层，需要两个配置文件sqlMapConfig.xml和xxxMapper.xml。
先在src的resources中新建一个包mybatis，其中放sqlMapConfig.xml,而sqlMapConfig被Spring接管了，（在resources中新建applicationContext-mapper.xml）所以不用在其中写什么:(这个千万不能删的，它这里体现着"mybatis".)

<?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>
</configuration>

在resources中新建applicationContext-controller.xml，用注解的方式来配置映射器，适配器，处理器，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:p="http://www.springframework.org/schema/p"
       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
    					http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="com.bit.controller"/>
    <mvc:annotation-driven/>

    <bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>


</beans>

在java中新建com.bit.controller包 ，我们要查询的是User表，因此在其中新建UserController类：

package com.bit.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {
    @RequestMapping("/")
    public  void  sayHello()
    {System.out.println("***************************");}
}

在web.xml中配置前端处理器：

<?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">
    <display-name>Archetype Created Web Application</display-name>
    <servlet>
        <servlet-name>mymvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/applicationContext-controller.xml</param-value>
        </init-param>
    </servlet>

<servlet-mapping>
        <servlet-name>mymvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

这时候启动Tomcat，在 UserController类的sayHello方法中打断点。
接下来处理与数据库相关的配置：
在resources中新建db.properties。

jdbc.driver=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=false
jdbc.password=jdpy1229jiajia

接下来写applicationContext-mapper.xml的内容，由Spring管理数据库和Mapper相关的信息：（这正是Spring整合Mybatis的体现所在。不需要在sqlMapConfig中写内容啦，因为交给Spring整合了，而正是在这个applicationContext-mapper.xml中进行整合的。）

<?xml version="1.0" encoding="ISO-8859-1"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:cache="http://www.springframework.org/schema/cache"
       xsi:schemaLocation="
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/jdbc
    http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
    http://www.springframework.org/schema/cache
    http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util.xsd">

    <context:property-placeholder location="classpath:db.properties"/>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<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>

    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"/>
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.bit.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sessionFactory"/>
    </bean>
</beans>

这里为什么需要"dataSource" dbcp，而不是使用JDBC呢？因为我们的web项目不是只在本地进行访问，是由服务器提供相应服务，web项目应当具有全局事务的能力，只能使用数据源，数据源中提供了连接池，提供了不同数量的连接，当我们需要的时候使用即可。
在这里插入图片描述
从这里可以看出Spring管理着sqlMapConfig.xml:

 <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"/>
        
        <property name="dataSource" ref="dataSource"/>
    </bean>

这里的sesseionFactory是重量级对象，创建一次即可。
从这里可以看出Spring管理着mapper，这样写会让Spring扫描mapper包:

<bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.bit.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sessionFactory"/>
    </bean>

其实我们之前写的WebServlet("/url")是省略了的，补全应是WebServlet(basePackage="/url")。
重点！！！：以上代码块中，在class为MapperScannerConfigurer的bean中，如果dataSource属性使用的不是"value=sessionFactory"，而是"ref=sessionFactory"，那么<context:property-placeholder location="classpath:db.properties"/>会失效。（官方文档说的）

需要新建mapper包，根据7条规则，给予接口和xml，在这里只写个select语句：

package com.bit.mapper;

import com.bit.po.User;

import java.util.List;

public interface UserMapper {
    public List<User> queryUserList()throws Exception;
}


<?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.bit.mapper.UserMapper">
    <resultMap id="myResultMap" type="com.bit.po.User">
        <id column="myNumber" property="userId"/>
        <result column="myName" property="userName"/>
        <result column="birthday" property="birthday"/>
        <result column="sex" property="userSex"/>
        <result column="address" property="userAddress"/>
    </resultMap>
    <select id="queryUserList" resultMap="myResultMap">
        select
            id as myNumber,
            username as myName,
            birthday,
            sex,
            address
        from
            user;
    </select>

</mapper>

需要新建po包，创建User类（省略无参构造、getter、setter方法）：

package com.bit.po;

import java.util.Date;

public class User {
    private int userId;
    private String userName;
    private Date birthday;
    private  String userSex;
    private String useraddess;
}

新建service包，其中有UserService接口和其实现类：

package com.bit.service;

import com.bit.po.User;

import java.util.List;

public interface UserService {
    public List<User> queryUserListService()throws Exception;
}


package com.bit.service;

import com.bit.po.User;

import java.util.List;

public class UserServiceImpl implements UserService {
    @Override
    public List<User> queryUserListService() throws Exception {
        return null;
    }
}

因为在我们的View-Controller-Model(Service)-Persistance(Mapper)架构中，上层依赖下层，而下层不依赖于上层，(Persistance不依赖Service,照样可以拿到数据，Service不依赖于Controller照样能管理类与类之间的关系。)不应产生循环依赖。 Contrller层是依赖于Service层的，Service层是依赖Mapper层的，这样才能去做相应的事务管理，去控制类与类之间的关系。UserController类新增 UserService属性

   @Autowired
    private UserService userService;

可以通过配置文件applicationContext-service.xml让Spring知道service的存在l:

<bean id="userservice" class="com.bit.service.UserServiceImpl">
</bean>

这时需要在web.xml新建一个监听器：

 <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring/applicationContext-*.xml</param-value>
  </context-param>

 <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

在UserController中继续写：


    @RequestMapping("/showUserList")
    public ModelAndView userController()throws Exception
    {
        List<User> userList=
        userService.queryUserListService();
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.addObject("userListKey",userList);
        modelAndView.setViewName("showUserList");

    return modelAndView;
    }

在webapp下的jsp包下的showUserList.jsp中写:

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<html>
<head>
    <title>ShowAllOfUser</title>
</head>
<body>
<table border="1" align="center" width="100%">
    <tr>
        <th>UserID</th>
        <th>UserName</th>
        <th>UserBirthday</th>
        <th>UserSex</th>
        <th>UserAddress</th>
    </tr>
    <c:forEach items="${userListKey}" var="users">
        <tr>
            <td>${users.userId}</td>
            <td>${users.userName}</td>
            <td>${users.birthday}</td>
            <td>${users.userSex}</td>
            <td>${users.userAddress}</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

这时运行Tomcat,报错： Artifact mySSMdemo:war exploded: Error during artifact deployment. See server log for details.
将web.xml中的中改成：

 <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring/applicationContext-controller.xml,
        classpath:spring/applicationContext-service.xml,classpath:spring/applictionContext-mapper.xml</param-value>
    </init-param>

写到这里时，Controller要调用Service，Service要调用Mapper,因此需要在UserServiceImpl中写入：

 @Autowired
    private UserMapper userMapper;
    @Override
    public List<User> queryUserListService() throws Exception {
        return userMapper.queryUserList();
    }

这时启动Tomcat，浏览器显示：
在这里插入图片描述
最基础的select操作，通过SSM框架已经完成的差不多了，接下来将它改为用注解的方式装配，只改以下几个部分：
首先，在UserServiceImpl上加上@Service注解：

@Service
public class UserServiceImpl implements UserService

并需要在applicationContext-controller.xml中添加以下，使service包得以被扫描：

<context:component-scan base-package="com.bit.service"/>

进阶操作是通过写JSP来实现更多的功能：增，删，改，查等。

小洪小洪/遇见彩虹。
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