java WEB 框架开发之SSM（springmvc、spring、mybatis）
在使用SSM开发项目之前，需要单独学习springmvc、spring、mybatis。
springmvc:当一个请求到来，springmvc执行流程：
1.前端控制器DispatcherServlet：拦截请求
2.处理器映射器（HandlerMapping）：找到对应的Handler
3.处理器适配器（HandlerAdaptor）：执行处理器
4.处理器（Handler）：处理请求（开发者编写，类似于Servlet），获取参数，查询数据库等操作
5.视图解析器（viewResolver）：解析视图并响应回浏览器
常用的注解：@RequestMapping("映射路径")：在方法中添加时表示此方法是一个处理器、@ResponseBody：返回json数据（ajax）、@RequestParam("key")：参数绑定等
spring：两个核心，IOC、AOP
IOC：依赖注入，管理bean，工厂模式，属性注入（set方法），构造器注入（构造函数）、静态工厂的方法注入、实例工厂的方法注入
AOP：面向切面编程，可以将方法插入或环绕在某个方法里，前置：在某个方法执行之前执行；后置：在执行之后执行；环绕：在执行之前和执行之后。aspect
切面方法：必须有参数JoinPoint类型或ProceedingJoinPoint类型
/** *环绕 **/ public Object around(ProceedingJoinPoint point){ System.out.println("执行之前要执行的代码"); Object returnMsg = point.proceed(); //放行，执行原方法 System.out.println("执行之后要执行的代码"); return returnMsg; } public void beforeOrAfter(JoinPoint point){ System.out.println("执行之前或之后要执行的代码"); }
mybatis：根据配置文件自动实现dao接口（创建实现类），半自动orm（Object Relation Mapping）框架,只需配置入参、出参、sql即可。
常用的配置标签：
sql：<insert><update><select><delete><sql><include>
映射标签：<resultMap><parameterMap><id><result><parameter><collection>：一对多、多对多；<association>:一对一。
动态sql：<where><set><choose><when><otherwise><if> <foreach>：批量
------------------------------------SSM整合开发----------------------------------
一、springmvc准备
1.配置springmvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" 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" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 组件扫描 ,扫描组件（注解：@Controller、@Service、@Repository、@Componment）创建bean--> <context:component-scan base-package="com.hgx.note.*.*"></context:component-scan> <!-- 处理器映射器、处理器适配器，注解驱动 --> <mvc:annotation-driven></mvc:annotation-driven> <!-- 视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix" value="/WEB-INF/jsp/"/> <!-- 后缀 --> <property name="suffix" value=".jsp"/> </bean> <!-- json支持,映射json为http消息转换器 --> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> </list> </property> </bean> <!-- 开启默认servlet：处理静态资源，以便静态资源不被dispatcherServlet当成Handler（处理器）拦截报404 ，此servlet的name为default--> <mvc:default-servlet-handler/> </beans>
2.在web.xml配置DispatcherServlet和拦截路径
<!-- spring-mvc核心servlet --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/spring-mvc.xml</param-value> </init-param> <!-- 服务器启动时创建 --> <load-on-startup>1</load-on-startup> </servlet> <!-- 拦截路径需要配置为/而不是/*，/*拦截所有包括.jsp；而/拦截没有后缀的请求如：/findAll --> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
到这里springmvc准备完毕
二、mybatis准备：mybatis.xml配置，开发时在配置mapper.xml
mybatis.xml一般只配置typeAilases和plugins，其他数据源等都与spring整合
<?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> <!-- 类型别名 --> <typeAliases> <typeAlias type="java.util.Map" alias="Map"/> </typeAliases> <plugins> <plugin interceptor="com.github.pagehelper.PageHelper"> <property name="dialect" value="oracle"/> </plugin> </plugins> </configuration>
三、spring整合springmvc和mybatis：关于spring的配置
1.springmvc不需要我们手动整合，springmvc默认整合了spring，使用spring创建的controller-bean
2.spring整合mybatis：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" 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" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载jdbc.properties --> <context:property-placeholder location="classpath:config/jdbc.properties"/> <!-- 组件扫描,扫描注解创建bean --> <context:component-scan base-package="com.hgx.note.*.*"/> <!-- spring-mybatis --> <!-- dataSources --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName"> <value>${driver_class}</value> </property> <property name="url"> <value>${jdbc_url}</value> </property> <property name="username"> <value>${jdbc_username}</value> </property> <property name="password"> <value>${jdbc_password}</value> </property> </bean> <!-- sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:config/mybatis.xml"/> <property name="mapperLocations" value="classpath:mappers/*.xml"/> </bean> <!-- 事务管理transactionManager --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 注解事物 --> <tx:annotation-driven transaction-manager="transactionManager"/> <!-- mapper（dao）接口扫描器，扫描接口并获取实现类对象：mybatis的 session.getMapper();--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hgx.note.*.dao"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> </beans>
四、最后也是最关键的一步，配置web.xml，加载spring
<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"> <display-name>Archetype Created Web Application</display-name> <!-- 获取spring.xml --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/spring.xml</param-value> </context-param> <!-- 加载spring的监听 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- spring-mvc核心servlet --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/spring-mvc.xml</param-value> </init-param> <!-- 服务器启动时创建 --> <load-on-startup>1</load-on-startup> </servlet> <!-- 拦截路径需要配置为/而不是/*，/*拦截所有包括.jsp；而/拦截没有后缀的请求如：/findAll --> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet> <servlet-name>imgServlet</servlet-name> <servlet-class>note.ImageServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>imgServlet</servlet-name> <url-pattern>/imageServlet</url-pattern> </servlet-mapping> <!-- 编码过滤器 --> <filter> <filter-name>encoding</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>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 加载log4j --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:config/log4j.properties</param-value> </context-param> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <!-- 静态资源处理servlet --> <servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>*.js</url-pattern> <url-pattern>*.css</url-pattern> <url-pattern>/assets/*"</url-pattern> <url-pattern>/images/*</url-pattern> <url-pattern>/static/*</url-pattern> </servlet-mapping> <!-- 欢迎页 --> <welcome-file-list> <welcome-file>WEB-INF/index.jsp</welcome-file> </welcome-file-list> <!-- 错误页 --> <error-page> <error-code>500</error-code> <location>/WEB-INF/jsp/errorpage/500.jsp</location> </error-page> <error-page> <error-code>404</error-code> <location>/WEB-INF/jsp/errorpage/404.jsp</location> </error-page> <!-- 项目路径唯一标识,把项目路径存至变量hgx.root中，在log4j中可以使用${hgx.root}获取项目路径 --> <context-param> <param-name>webAppRootKey</param-name> <param-value>hgx.root</param-value> </context-param> </web-app>
最后的最后，附上maven的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.hgx</groupId> <artifactId>note</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>note Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <!-- spring版本号 --> <spring.version>3.2.4.RELEASE</spring.version> <!-- mybatis版本号 --> <mybatis.version>3.2.4</mybatis.version> <!-- log4j日志文件管理包版本 --> <slf4j.version>1.6.6</slf4j.version> <log4j.version>1.2.9</log4j.version> <!-- <hessian.version>4.0.38</hessian.version> --> </properties> <dependencies> <!-- spring核心包 --> <!-- springframe start --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${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>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- springframe end --> <!-- mybatis核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- mybatis/spring包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- mybatis分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.4</version> </dependency> <!-- oracle驱动包 --> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.3</version> </dependency> <!-- junit测试包 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!-- 阿里巴巴数据源 包 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.2</version> </dependency> <!-- json数据 --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.4.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.4.3</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.4</version> </dependency> <!-- json2java --> <dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> <version>1.8.3</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.2.1</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.2.3</version> </dependency> <!-- <dependency> <groupId>net.sf.ezmorph</groupId> <artifactId>ezmorph</artifactId> <version>1.0.6</version> </dependency> --> <!-- 日志文件管理包 --> <!-- 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> <!-- <dependency> <groupId>com.caucho</groupId> <artifactId>hessian</artifactId> <version>${hessian.version}</version> </dependency> --> <!-- log end --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- 标签库 --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <!-- jsp --> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <!-- mysql驱动包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> </dependencies> <build> <finalName>note</finalName> </build> </project>
