JavaWeb项目(SSM)准备工作
1.新建dynamic web project(Maven project也行)
我用的Eclipse + ssm + mysql
2.准备jar包
整合ssm的包
1. springmvc: ...
2. 数据库连接: mysql-connector-java-5.1.39.jar
3. mybatis: ...
4. spring: spring4.2
5. spring和mybatis整合包: mybatis-spring-1.3.0.jar
6. log4j: ...
7. dbcp数据库连接池: ...
8. jstl表达式: ...
如果用maven,就只要配置好pom.xml即可,否则自己去下jar包,有点麻烦。。。
大概依赖包有这么多,有一点点是多余的。。。
3.建好工程目录
SqlMapConfig.xml - Mybatis的配置文件
<?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"> <configuration> <!-- 加载映射文件 --> <mappers> <!-- 加载原始dao层开发的配置文件 --> <!-- <mapper resource="sqlmap/User.xml"/> --> <!-- 批量加载mapper 指定mapper接口的包名,mybatis下自动扫描包下的接口加载 遵循一些规范:需要将mapper接口类名和mapper.xml名一致,且在一个目录中 spring扫描过就不需要扫描了 --> <!-- <package name="com.happycode.ssm.mapper"></package> --> </mappers> </configuration>
applicantionContext.xml - spring的配置文件
<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- 加载mysql连接配置文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置数据源,使用dbcp --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driver}"></property> <property name="url" value="${jdbc.url}"></property> <property name="username" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> <property name="maxActive" value="10"></property> <property name="maxIdle" value="5"></property> </bean> <!-- 配置sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 加载mybatis配置文件 --> <property name="configLocation" value="mybatis/SqlMapConfig.xml"></property> <property name="dataSource" ref="dataSource"></property> </bean> <!-- mapper的批量扫描,从mapper的包中,扫描出mapper接口,自动创建出代理对象,并在spring中注入 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 如果扫描多个包,用逗号隔开 --> <property name="basePackage" value="com.happycode.ssm.mapper"></property> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean> </beans>
db.properties - 配置数据库连接参数
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8&useSSL=true jdbc.username=happycode jdbc.password=twh123
log4j.properties - log4j用于输出运行日志信息
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
#log4j.logger.org.mybatis.example.BlogMapper=TRACE
# 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
springmvc.xml - springmvc的配置
<?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-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd"> <!-- 配置handler name 是给第一个映射器用的 id 是给第二个映射器用的 --> <bean id="ItemController1" name="/queryItems.action" class="com.happycode.ssm.controller.ItemController1"></bean> <!-- 另一个Handler --> <bean id="ItemController2" class="com.happycode.ssm.controller.ItemController2"></bean> <!-- 配置单个注解Handler --> <!-- <bean class="com.happycode.ssm.controller.ItemController3"></bean> --> <!-- 可以扫描controller,service --> <context:component-scan base-package="com.happycode.ssm.controller"></context:component-scan> <!-- 处理器映射器,第一种 x将Bean的name当作url进行查找,需要在配置Handler时指定beanname(就是url) --> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean> <!-- 处理器映射器,第二种 x简单url映射 --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/queryItemList.action">ItemController1</prop> <!-- 直接配置ItemController2 --> <prop key="/queryItemList2.action">ItemController2</prop> </props> </property> </bean> <!-- 注解的处理器映射器 --> <bean name="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean> <!-- 注解的处理器适配器 --> <bean name="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean> <!-- 使用mvc:annotation-driven代替上边的映射器和适配器 x默认加载了很多参数绑定方法,比如json转换的解析器 --> <mvc:annotation-driven></mvc:annotation-driven> <!-- 处理器适配器,第一种--> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean> <!-- 处理器适配器,第二种 --> <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean> <!-- 配置视图解析器 x解析jsp,默认使用jstl --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean> </beans>
web.xml - springmvc的前端控制器配置
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>springmvc01</display-name> <!-- springmvc前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- contextConfigLocation配置springmvc加载 如果不配置 contextConfigLocation默认加载/WEB-INF/servlet名称-servlet.xml(此例: /WEB-INF/srpingmvc-servlet.xml) --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <!-- 第一种:*.action访问.action结尾都由DispatcherServlet进行解析 第二种:/,所有访问的地址都由DispatcherServlet进行解析,对于静态文件无需配置DispatcherServlet进行解析 第三种/*,这样配置不对,使用这种配置, 最终转发到一个jsp页面时,任然由DispatcherServlet解析jsp地址,不能根据jsp页面找到handler,会报错 --> <servlet-name>springmvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
4.mybatis逆向工程(可选)
这个可以对你规定的单表生成对应的pojo类,并准备好各种sql语句,单表查询极为方便,还可以生成对应的mapper
generatorConfig.xml - 将这个放在项目根目录下
<?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> <context id="testTables" targetRuntime="MyBatis3"> <commentGenerator> <!-- 是否去除自动生成的注释 true:是 : false:否 --> <property name="suppressAllComments" value="true" /> </commentGenerator> <!--数据库连接的信息:驱动类、连接地址、用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/mybatis" userId="happycode" password="twh123"> </jdbcConnection> <!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver" connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg" userId="yycg" password="yycg"> </jdbcConnection> --> <!-- 默认false,把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer,为 true时把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal --> <javaTypeResolver> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <!-- targetProject:生成PO类的位置 --> <javaModelGenerator targetPackage="com.happycode.ssm.po" targetProject=".\src"> <!-- enableSubPackages:是否让schema作为包的后缀 --> <property name="enableSubPackages" value="false" /> <!-- 从数据库返回的值被清理前后的空格 --> <property name="trimStrings" value="true" /> </javaModelGenerator> <!-- targetProject:mapper映射文件生成的位置 --> <sqlMapGenerator targetPackage="com.happycode.ssm.mapper" targetProject=".\src"> <!-- enableSubPackages:是否让schema作为包的后缀 --> <property name="enableSubPackages" value="false" /> </sqlMapGenerator> <!-- targetPackage:mapper接口生成的位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.happycode.ssm.mapper" targetProject=".\src"> <!-- enableSubPackages:是否让schema作为包的后缀 --> <property name="enableSubPackages" value="false" /> </javaClientGenerator> <!-- 指定数据库表 --> <table schema="" tableName="user"></table> <table schema="" tableName="orders"></table> <table schema="" tableName="Item"></table> <table schema="" tableName="orderdetail"></table> <!-- 有些表的字段需要指定java类型 <table schema="" tableName=""> <columnOverride column="" javaType="" /> </table> --> </context> </generatorConfiguration>
执行代码,生成文件:
import java.io.File; import java.util.ArrayList; import java.util.List; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.internal.DefaultShellCallback; public class GeneratorSqlMap { public void generator() throws Exception { List<String> warnings = new ArrayList<String>(); boolean overwrite = true; File configFile = new File("generatorConfig.xml"); ConfigurationParser cp = new ConfigurationParser(warnings); Configuration config = cp.parseConfiguration(configFile); DefaultShellCallback callback = new DefaultShellCallback(overwrite); MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); } public static void main(String[] args) throws Exception { GeneratorSqlMap generatorSqlMap = new GeneratorSqlMap(); generatorSqlMap.generator(); } }