這是基礎的SSM整合,使用IDEA+Maven,而且本次使用了逆向工程
整合步驟
1.創建空的web項目,添加pom依賴
2.需要的配置文件:
web.xml
springmvc.xml
applicationContext.xml
jdbc.properties
log4j.properties
逆向工程還需要generatorConfig.xml
在web.xml中配置Spring容器與SpringMVC核心控制器
3.整合MyBatis與Spring
添加pom依賴
<dependencies>
<!-- spring + springwebmvc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<!-- mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.3</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!-- JDBC-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<!--事務管理-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<!--AspectJ-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.0</version>
</dependency>
<!-- jstl jsp servlet-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.3</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<!--逆向工程-->
<build>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.7</version>
<configuration>
<!-- 是否覆蓋已存在的接口和POJO該配置不包括Mapper
若爲False將會生成版本記錄-->
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
web.xml加載配置文件:
<?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">
<!--Spring begin-->
<!--配置spring容器 配置監聽器 在程序啓動時加載applicationContext.xml -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--Spring end-->
<!--SpringMVC begin-->
<servlet>
<!--1.配置前端控制器-->
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<!-- 默認找 /WEB-INF/[servlet的名稱]-servlet.xml -->
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<!--前端控制器end-->
<!--2.配置編碼過濾器,處理POST提交亂碼問題-->
<filter>
<filter-name>encodingFilter</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>
<!--是否設置響應編碼-->
<init-param>
<param-name>forceResponseEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--編碼過濾器end-->
<!--SpringMVC end-->
</web-app>
jdbc.properties
jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql:///student?characterEncoding=utf8&nullCatalogMeansCurrent=true
jdbc.user = root
jdbc.password = 123456
location = D:/maven/repository/mysql/mysql-connector-java/5.1.44/mysql-connector-java-5.1.44.jar
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"
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">
<!--開啓註解掃描-->
<context:component-scan base-package="com.cx"/>
<!--整合mybatis相關的 配置數據庫-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置數據源-->
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!--產生SqlSessionFactory-->
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--如果需要可以在這裏配置別名-->
<!--<property name="typeAliases" value="對應包下的"/>-->
<!--也可以自定義一個配置文件:SqlMapConfig.xml 進行引入核心配置別名什麼的-->
<!--<property name="configLocation" value="SqlMapConfig.xml"/>-->
</bean>
<!--動態代理 掃描-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.cx.dao"/>
</bean>
</beans>
創建並配置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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--開啓掃描包註解-->
<context:component-scan base-package="com.cx"/>
<!--註解驅動-->
<mvc:annotation-driven/>
<!--配置視圖解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
逆向生成配置文件generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--導入屬性配置--><!--
<properties resource="jdbc.properties"></properties>-->
<properties resource="jdbc.properties"/>
<!--指定特定數據庫的jdbc驅動jar包的位置-->
<classPathEntry location="${location}"/>
<context id="default" targetRuntime="MyBatis3">
<!-- optional,旨在創建class時,對註釋進行控制 -->
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--jdbc的數據庫連接 -->
<jdbcConnection
driverClass="${jdbc.driver}" connectionURL="${jdbc.url}" userId="${jdbc.user}" password="${jdbc.password}">
</jdbcConnection>
<!-- 非必需,類型處理器,在數據庫類型和java類型之間的轉換控制-->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--Model模型生成器,用來生成含有主鍵key的類,記錄類 以及查詢Example類
targetPackage 指定生成的model生成所在的包名
targetProject 指定在該項目下所在的路徑 -->
<javaModelGenerator targetPackage="com.cx.pojo" targetProject="src/main/java">
<!-- 是否允許子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否對model添加 構造函數 -->
<property name="constructorBased" value="true"/>
<!-- 是否對類CHAR類型的列的數據進行trim操作 -->
<property name="trimStrings" value="true"/>
<!-- 建立的Model對象是否 不可改變 即生成的Model對象不會有 setter方法,只有構造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!--mapper映射文件生成所在的目錄 爲每一個數據庫的表生成對應的SqlMap文件 -->
<sqlMapGenerator targetPackage="com.cx.dao"
targetProject="src/main/resources">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!--mapper接口文件生成所在的目錄 爲每一個數據庫的表生成對應的接口文件 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.cx.dao" targetProject="src/main/java">
<!-- enableSubPackages:是否讓schema(數據庫名稱)作爲包的後綴 -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!--指定需要生成的表-->
<table tableName="student"></table>
</context>
</generatorConfiguration>
測試:
controller:
@Controller
public class StudentController {
@Autowired
private StudentService studentService;
@RequestMapping("selectAllStu")
public ModelAndView selectAllStu(){
List<Student> students = studentService.selectAll();
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("students",students);
modelAndView.setViewName("studentList");
return modelAndView;
}
}
service:
public interface StudentService {
List<Student> selectAll();
}
serviceImpl
@Service
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentMapper studentMapper;
@Override
public List<Student> selectAll() {
return studentMapper.selectByExample(null);
}
}
studentList.jsp:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
Created by IntelliJ IDEA.
User: ycx
Date: 2020/6/19
Time: 18:30
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<table border="1">
<c:forEach items="${students}" var="student" varStatus="in">
<tr>
<th>${in.count}</th>
<th>id</th>
<th>username</th>
<th>password</th>
</tr>
<tr>
<td>${in.count}</td>
<td>${student.id}</td>
<td>${student.name}</td>
<td>${student.pwd}</td>
</tr>
</c:forEach>
</table>
</body>
</html>
dao、pojo、mapper文件都是逆向工程產生的
運行結果:
到此SSM的整合基本上就完成了; (事務配置和其他配置均與Spring項目沒有區別)
事務AOP等配置與單獨的Spring沒有區別,但不過要注意現在有兩個Spring配置文件,別寫錯位置;
Spring和SpringMVC容器的關係
SpringMVC容器固然是一個擁有Spring所有功能的容器,但是爲了分離關注點,通常SpringMVC容器只處理與請求響應相關的內容,即Controller層;
Spring框架採用了父子容器的方式來實現分離關注點;實際上SpringMVC被作爲了Spring的子容器;如下所示:
- 外層的Spring容器爲父容器
- 裏面的SpringMVC爲子容器,要強調的是其他的框架並不是容器,只是容器中的一堆Bean;
職責分配:
- Spring容器主要負責集成其他框架,配置AOP,事務
- SpringMVC容器負責處理請求響應即Controller層
特點:
子容器可直接訪問父容器中的Bean,而父容器不能訪問子容器的Bean
子容器優先從自身裏查找Bean,找不到時纔會找父容器
容易出的問題:
- 事務處理通常在父容器中配置。
因爲MyBatis相關Bean是由父容器管理的,假設已經在父容器爲Service層配置了事務,子容器沒有配置事務,但是子容器卻掃描了Service層,這時候事務就不生效了,因爲子容器中有ServiceBean,但是卻沒有事務;