• java学习day39--SSM整合(方案二)


    项目环境搭建(SSM整合)

    项目环境搭建

    1、创建Maven的简单web工程

    2、补全WEB-INF目录和web.xml文件

    3、创建包和目录

    4、在pom.xml文件中,引入junit、log4j、servlet等依赖包

    <dependencies>
    	<!-- 单元测试 -->
    	<dependency>
    		<groupId>junit</groupId>
    		<artifactId>junit</artifactId>
    		<version>4.10</version>
    		<scope>test</scope>
    	</dependency>
    	<!-- 整合log4j -->
    	<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-log4j12</artifactId>
    			<version>1.6.4</version>
    	</dependency>
    	<!-- Servlet/JSP/JSTL -->
    	<dependency>
    		<groupId>javax.servlet</groupId>
    		<artifactId>servlet-api</artifactId>
    		<version>2.5</version>
    		<scope>provided</scope>
    	</dependency>
    	<dependency>
    		<groupId>javax.servlet</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>
      
    </dependencies>
    

    5、在resources目录下创建log4j.properties文件,配置内容如下:

    # Global logging configuration
    log4j.rootLogger=DEBUG, stdout
    # Console output...
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%5p [%t]  %m%n
    

    6、在resources目录下创建jdbc.properties文件,配置内容如下:

    db.driverClassName=com.mysql.jdbc.Driver
    db.url=jdbc:mysql:///yonghedb?characterEncoding=utf-8
    db.username=root
    db.password=root
    

    整合spring框架

    1、在pom.xml文件中,引入spring的依赖包

    <!-- 整合spring框架(包含springmvc)
    	这个jar文件包含springmvc开发时的核心类, 同时也会将依赖的相关jar文件引入进来(spring的核心jar文件也包含在内)
     -->
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-webmvc</artifactId>
    	<version>4.1.3.RELEASE</version>
    </dependency>
    <!--这个jar文件包含对Spring对JDBC数据访问进行封装的所有类 -->
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-jdbc</artifactId>
    	<version>4.1.3.RELEASE</version>
    </dependency>
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-aspects</artifactId>
    	<version>4.1.3.RELEASE</version>
    </dependency>
    

    2、在src/main/resources/spring目录下,创建spring的核心配置文件:applicationContext.xml

    配置内容如下:

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    	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-4.0.xsd
    	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
    
    </beans>
    

    整合springmvc框架

    前面在添加spring的jar包同时,将springmvc的jar包也引入了,因此这里不再引入springmvc的jar包

    1、在resources/spring目录下,创建springmvc的核心配置文件:springmvc-config.xml,内容配置如下:

    <?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/mvc
    						http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    						http://www.springframework.org/schema/beans
    						http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    						http://www.springframework.org/schema/context
              				http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    	
    	<!-- 1.配置前端控制器放行静态资源(html/css/js等,否则静态资源将无法访问) -->
    	<mvc:default-servlet-handler/>
    	
    	<!-- 2.配置注解驱动,用于识别注解(比如@Controller) -->
    	<mvc:annotation-driven></mvc:annotation-driven>
    	
    	<!-- 3.配置需要扫描的包:spring自动去扫描 base-package 下的类,
    		如果扫描到的类上有 @Controller、@Service、@Component等注解,
    		将会自动将类注册为bean 
    	 -->
    	<context:component-scan base-package="com.tedu.controller">
    	</context:component-scan>
    	
    	<!-- 4.配置内部资源视图解析器
    		prefix:配置路径前缀
    		suffix:配置文件后缀
    	 -->
    	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/pages/"/>
    		<property name="suffix" value=".jsp"/>
    	</bean>
    	
    	
    </beans>
    

    2、在web.xml中配置springmvc

    <!-- 配置springmvc, 将所有请求交给springmvc来处理 -->
    <servlet>
    	<servlet-name>springmvc</servlet-name>
    	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    	<!-- 配置springmvc核心配置文件的位置,默认Springmvc的配置文件是在WEB-INF目录下,默认的名字为springmvc-servlet.xml,如果要放在其他目录,则需要指定如下配置:
    		-->
    	<init-param>
    		<param-name>contextConfigLocation</param-name>
    		<param-value>classpath:spring/*.xml</param-value>
    	</init-param>		
    </servlet>
    <!-- 其中的斜杠(/)表示拦截所有请求(除JSP以外), 所有请求都要经过springmvc前端控制器 -->
    <servlet-mapping>
    	<servlet-name>springmvc</servlet-name>
    	<url-pattern>/</url-pattern>
    </servlet-mapping>
    

    3、配置springmvc乱码处理过滤器

    <!-- 乱码处理过滤器 -->
    <filter>
    	<filter-name>encodingFilter</filter-name>
    	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    	<!-- 指定编码集 -->
    	<init-param>
    		<param-name>encoding</param-name>
    		<param-value>utf-8</param-value>
    	</init-param>
    </filter>
    <filter-mapping>
    	<filter-name>encodingFilter</filter-name>
    	<!-- 指定拦截方式为拦截所有请求 -->
    	<url-pattern>/*</url-pattern>
    </filter-mapping>
    

    3、测试springmvc框架:

    (1)创建test.jsp页面

    在WEB-INF/pages/目录下,创建test.jsp页面。

    <%@ page pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    	<meta charset="utf-8"/>
    </head>
    <body>
    	<h1>yonghe-ssm test.jsp~~~</h1>
    </body>
    </html>
    

    (2)创建测试Controller: DoorController

    /** 测试类:测试springmvc开发环境 */
    @Controller
    public class DoorController {
    	@RequestMapping("/testmvc")
    	public String testmvc(){
    		return "test";
    	}
    }
    

    (3)将项目部署到服务器中,启动服务器:

    访问效果如下:

    image-20200422164842188

    整合mybatis框架

    1、在pom.xml文件中,引入mybatis及相关依赖包

    <!-- 整合mybatis框架 -->
    <dependency>
    	<groupId>org.mybatis</groupId>
    	<artifactId>mybatis</artifactId>
    	<version>3.2.8</version>
    </dependency>
    <dependency>
    	<groupId>org.mybatis</groupId>
    	<artifactId>mybatis-spring</artifactId>
    	<version>1.2.2</version>
    </dependency>
    <!-- mysql驱动 -->
    <dependency>
    	<groupId>mysql</groupId>
    	<artifactId>mysql-connector-java</artifactId>
    	<version>5.1.32</version>
    </dependency>
    <!-- druid连接池 -->
    <dependency>
    	<groupId>com.alibaba</groupId>
    	<artifactId>druid</artifactId>
    	<version>1.1.6</version>
    </dependency>
    

    2、在resources/mybatis目录下,创建mybatis的核心配置文件: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">
        
    <!-- MyBatis的全局配置文件 -->
    <configuration >
    	<!-- 1.配置开发环境 -->
    	<environments default="develop">
    		<!-- 这里可以配置多个环境,比如develop,test等 -->
    		<environment id="develop">
    			<!-- 1.1.配置事务管理方式:JDBC:将事务交给JDBC管理(推荐) -->
    			<transactionManager type="JDBC"></transactionManager>
    			<!-- 1.2.配置数据源,即连接池方式:JNDI/POOLED/UNPOOLED -->
    			<dataSource type="POOLED">
    				<property name="driver" value="com.mysql.jdbc.Driver"/>
    				<property name="url" value="jdbc:mysql://localhost:3306/yonghedb?characterEncoding=utf-8"/>
    				<property name="username" value="root"/>
    				<property name="password" value="root"/>
    			</dataSource>
    		</environment>
    	</environments>
    	
    	<!-- 2.加载Mapper配置文件,路径以斜杠间隔: xx/xx/../xx.xml -->
    	<mappers>
    		<mapper resource="mybatis/mapper/DoorMapper.xml"/>
    	</mappers>
    </configuration>
    

    3、在src/main/resources/mybatis/mapper目录下,创建Door实体类的映射文件:DoorMapper.xml

    配置内容如下:

    <?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">
    <!-- 门店表的映射文件	namespace值为对应接口的全路径 -->
    <mapper namespace="com.tedu.dao.DoorMapper">
    	<!-- 1.查询所有门店信息,id值为对应接口中方法的名字
    		resultType指定将查询的结果封装到哪个pojo对象中
    	 -->
    	<select id="findAll" resultType="com.tedu.pojo.Door">
    		select * from tb_door
    	</select>
    </mapper>
    

    4、在mybatis的全局配置文件中引入DoorMapper.xml映射文件

    <?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">
        
    <!-- MyBatis的全局配置文件 -->
    <configuration >
    	<!-- 1.配置开发环境 -->
    	...
    	<!-- 2.加载Mapper配置文件,路径以斜杠间隔: xx/xx/../xx.xml -->
    	<!-- 配置映射文件 -->
    	<mappers>
    		<mapper resource="mybatis/mapper/DoorMapper.xml"/>
    	</mappers>
    	
    </configuration>
    

    5、创建com.tedu.dao.DoorMapper接口,并根据EmpMapper.xml文件中的sql语句,提供findAll方法

    package com.tedu.dao;
    import java.util.List;
    import com.tedu.pojo.Door;
    /**
     * DoorMapper接口 
     * 声明增删改查方法,对门店信息进行操作
     */
    public interface DoorMapper {
    	/**
    	 * 1.查询所有门店信息
    	 */
    	public List<Door> findAll();
    
    }
    

    6、创建实体类Door,用于封装所有的门店信息

    package com.tedu.pojo;
    public class Door {
    	private Integer id;	//门店编号
    	private String name;	//门店名称
    	private String tel;	//门店电话
    	private String addr;	//门店地址
    	
    	//getter和setter方法
    	public Integer getId() {
    		return id;
    	}
    	public void setId(Integer id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public String getTel() {
    		return tel;
    	}
    	public void setTel(String tel) {
    		this.tel = tel;
    	}
    	public String getAddr() {
    		return addr;
    	}
    	public void setAddr(String addr) {
    		this.addr = addr;
    	}
    	//重写toString方法
    	@Override
    	public String toString() {
    		return "Door [id=" + id + ", name=" + name + ", tel=" + tel + ", addr=" + addr + "]";
    	}
    }
    

    7、创建测试com.tedu.controller.TestMybatis类,对mybatis开发环境进行测试

    package com.tedu.controller;
    import java.io.InputStream;
    import java.util.List;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import com.tedu.dao.DoorMapper;
    import com.tedu.pojo.Door;
    /** 测试类:测试mybatis开发环境 */
    public class TestMybatis {
    	public static void main(String[] args) throws Exception {
    		//1.读取mybatis-config.xml核心文件
    		InputStream in = Resources.getResourceAsStream(
    				"mybatis/mybatis-config.xml");
    		//2.获取SqlSessionFactory工厂
    		SqlSessionFactory factory = 
    				new SqlSessionFactoryBuilder()
    				.build(in);
    		//3.获取SqlSession对象
    		SqlSession session = factory.openSession();
    		
    		//4.获取DoorMapper接口的实例
    		DoorMapper mapper = session.getMapper(DoorMapper.class);
    		//5.调用findAll方法查询所有门店信息
    		List<Door> list = mapper.findAll();
    		//6.遍历所有门店信息
    		for(Door door : list){
    			System.out.println(door);
    		}
    	}
    }
    

    执行结果:

    整合spring和mybatis

    1、修改mybatis-config.xml文件,将数据源等配置移除,在spring的配置文件中配置

    <?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">
        
    <!-- MyBatis的全局配置文件 -->
    <configuration >
    	<!-- 1.配置开发环境 -->
    	<!-- 1.1.配置事务管理方式:JDBC:将事务交给JDBC管理(推荐) -->
    	<!-- 1.2.配置数据源,即连接池方式:JNDI/POOLED/UNPOOLED -->
    	<!-- 2.加载Mapper配置文件,路径以斜杠间隔: xx/xx/../xx.xml -->
    	
    </configuration>
    

    2、在applicationContext.xml中配置 druid连接池、SqlSession工厂等

    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    	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-4.0.xsd
    	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
    	
    	<!-- 1.加载jdbc.properties文件的位置 -->
    	<context:property-placeholder location="classpath:jdbc.properties"/>
    	
    	<!-- 2.配置druid连接池 ,id是固定值,class是druid连接池类的全路径 -->
    	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    		<!-- 配置连接数据库的基本信息 -->
    		<property name="driverClassName" value="${db.driverClassName}"></property>
    		<property name="url" value="${db.url}"></property>
    		<property name="username" value="${db.username}"></property>
    		<property name="password" value="${db.password}"></property>
    	</bean>
    	
    	<!-- 3.整合spring和mybatis框架	
    		将SqlSession等对象的创建交给Spring容器
    		id值(sqlSessionFactory)是固定值
    	 -->
    	<bean id="sqlSessionFactory" 
    		class="org.mybatis.spring.SqlSessionFactoryBean">
    		<!-- 3.1.指定mybatis核心配置文件的位置 -->
    		<property name="configLocation" 
    				value="classpath:mybatis/mybatis-config.xml"></property>
    		<!-- 3.2.配置连接池(数据源) ref指向连接池bean对象的id值 -->
    		<property name="dataSource" ref="dataSource"></property>
    		<!-- 3.3、扫描所有的 XxxMapper.xml映射文件,读取其中配置的SQL语句 -->
    		<property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"/>
    	</bean>
    	
    	<!-- 4、定义mapper接口扫描器 -->
    	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    		<!-- 扫描所有XxxMapper接口,将接口实例的创建交给spring容器 -->
    		<property name="basePackage" 
    			value="com.tedu.dao"/>
    	</bean>
    	
    	
    </beans>
    

    3、在resources目录下创建jdbc.properties文件,将连接数据库的基本信息提取到文件中

    db.driverClassName=com.mysql.jdbc.Driver
    db.url=jdbc:mysql:///yonghedb?characterEncoding=utf-8
    db.username=root
    db.password=root
    

    4、复制TestController类,改名为TestSSM

    package com.tedu.controller;
    import java.util.List;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import com.tedu.dao.DoorMapper;
    import com.tedu.pojo.Door;
    
    /** 测试类:测试SSM开发环境 */
    @Controller /* 这个注解表示当前类属于Controller层代码 */
    public class TestSSM {
    	
    	/** 自动装配:由spring自动为属性赋值(对象)  */
    	@Autowired
    	DoorMapper mapper;
    	
    	@RequestMapping("/testssm")
    	public String testSSM(){
    		//1.调用findAll方法查询所有门店信息
    		List<Door> list = mapper.findAll();
    		//2.遍历所有门店信息
    		for(Door door : list){
    			System.out.println(door);
    		}
    		return "test";
    	}
    }
    
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  • 原文地址:https://www.cnblogs.com/liqbk/p/13193224.html
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