玩转 SSH（六）：SpringMVC + MyBatis 架构搭建（注解版）
一、创建 SSMVCAnnoDemo 项目
点击菜单，选择“File -> New Project” 创建新项目。选择使用 archetype 中的 maven-webapp 模版创建。
输入对应的项目坐标GroupId 和 ArtifactId
之后在项目名称中填入项目名称，这里我填的 ProjectName 和上文的 ArtifactId 相同，都是 SSMVCAnnoDemo。
点击确定后，等待 Maven 帮我们构建好项目的目录结构。当控制台显示 BUILD SUCCESS 就表示初始化完成了。
初始化完成后的目录结构是这样的：
在 main 目录下创建 java 目录并将其设置为源码目录：
之后创建 com.chanshuyi.action 等包，创建完成后的目录结构如下：
二、导入依赖的包和插件
设置 POM.XML 配置文件中的全局属性：
<!-- 声明全局属性 --> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <struts.version>2.3.24</struts.version> <springframework.version>4.1.6.RELEASE</springframework.version> <junit.version>3.8.1</junit.version> <commonsLogging.version>1.2</commonsLogging.version> </properties>
依次引入 MyBatis、Spring、SpringMVC、MySQL、Druid、JUnit、Log4J 等的依赖 Jar 包：
<!-- ********************** MyBatis ********************** --> <!-- MyBatis 核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.1.1</version> </dependency> <!-- 添加mybatis与Spring整合的核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.1.1</version> </dependency> <!-- ********************** Spring ********************** --> <!-- Spring MVC 依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加Spring-core包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-tx包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${springframework.version}</version> </dependency> <!-- Spring ORM 相关--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-jdbc包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${springframework.version}</version> </dependency> <!--添加spring-web包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-context包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${springframework.version}</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>${commonsLogging.version}</version> </dependency> <!--添加aspectjweaver包 --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.5</version> </dependency> <!-- ********************** Spring MVC 依赖的jar包 **********************--> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- Servelt API --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> <!-- ********************** DB Connection ********************** --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.21</version> </dependency> <!-- Druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.6</version> </dependency> <!-- ********************** 其他 ********************** --> <!-- 单元测试 JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <!-- 日志记录 Log4j --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.6</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.6</version> </dependency>
之后导入 Tomcat 启动插件，我们将通过 Maven 方式启动 Tomcat，这样就不必在本地配置一个 Tomcat 服务器。
<!-- Maven的Tomcat插件（支持Maven以"tomcat7:run"方式启动web项目） --> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.1</version> <configuration> <port>5050</port> <path>/</path> <uriEncoding>UTF-8</uriEncoding> <finalName>mgr</finalName> <server>tomcat7</server> </configuration> </plugin>
配置完成后的 POM.XML 是这样的：
<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.chanshuyi.SSMVCAnnoDemo</groupId> <artifactId>SSMVCAnnoDemo</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>SSMVCAnnoDemo Maven Webapp</name> <url>http://maven.apache.org</url> <!-- 声明全局属性 --> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <struts.version>2.3.24</struts.version> <springframework.version>4.1.6.RELEASE</springframework.version> <junit.version>3.8.1</junit.version> <commonsLogging.version>1.2</commonsLogging.version> </properties> <dependencies> <!-- ********************** MyBatis ********************** --> <!-- MyBatis 核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.1.1</version> </dependency> <!-- 添加mybatis与Spring整合的核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.1.1</version> </dependency> <!-- ********************** Spring ********************** --> <!-- Spring MVC 依赖 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加Spring-core包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-tx包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${springframework.version}</version> </dependency> <!-- Spring ORM 相关--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-jdbc包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${springframework.version}</version> </dependency> <!--添加spring-web包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${springframework.version}</version> </dependency> <!-- 添加spring-context包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${springframework.version}</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>${commonsLogging.version}</version> </dependency> <!--添加aspectjweaver包 --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.5</version> </dependency> <!-- ********************** Spring MVC 依赖的jar包 **********************--> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!-- Servelt API --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> <!-- ********************** DB Connection ********************** --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.21</version> </dependency> <!-- Druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.6</version> </dependency> <!-- ********************** 其他 ********************** --> <!-- 单元测试 JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <!-- 日志记录 Log4j --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.6</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.6</version> </dependency> </dependencies> <build> <finalName>SSMVCAnnoDemo</finalName> <plugins> <!-- Maven的Tomcat插件（支持Maven以"tomcat7:run"方式启动web项目） --> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.1</version> <configuration> <port>5050</port> <path>/</path> <uriEncoding>UTF-8</uriEncoding> <finalName>mgr</finalName> <server>tomcat7</server> </configuration> </plugin> </plugins> </build> </project>
三、开发模型层（MyBatis）
创建 SpringMVC 配置文件 resources/spring-servlet.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" xmlns:p="http://www.springframework.org/schema/p" 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" default-lazy-init="true"> <!-- 添加注解驱动 --> <mvc:annotation-driven /> <!-- 默认扫描的包路径 --> <context:component-scan base-package="com.chanshuyi.controller, com.chanshuyi.service.impl, com.chanshuyi.dao.impl" /> <!-- mvc:view-controller可以在不需要Controller处理request的情况，转向到设置的View --> <!-- 像下面这样设置，如果请求为/，则不通过controller，而直接解析为/index.jsp --> <!--<mvc:view-controller path="/" view-name="index" />--> <!-- 配置 SpringMVC Controller 转发JSP页面的路径 --> <bean class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> <!-- 配置jsp路径前缀 --> <property name="prefix" value="/"></property> <!-- 配置URl后缀 --> <property name="suffix" value=".jsp"></property> </bean> <!-- ================================== import sub-config file ================================== --> <import resource="spring-mybatis.xml" /> <!-- ================================== /import sub-config file ================================== --> </beans>
创建 spring-mybatis.xml 文件，配置一个只读的数据源以及一个只写的数据源
<?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 http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 引入外部properties文件 --> <context:property-placeholder location="classpath:jdbc.properties" /> <!-- ====================================================== Add MyBatis Support Start ====================================================== --> <!-- 配置写数据源 --> <bean id="dataSourceWrite" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本属性 url、user、password --> <property name="url" value="${jdbc.master.url}" /> <property name="username" value="${jdbc.master.username}" /> <property name="password" value="${jdbc.master.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="${jdbc.master.initialSize}" /> <property name="minIdle" value="${jdbc.master.minIdle}" /> <property name="maxActive" value="${jdbc.master.maxActive}" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="60000" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT '1'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="true" /> <property name="testOnReturn" value="false" /> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 mysql false --> <property name="poolPreparedStatements" value="false" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> <!-- 配置监控统计拦截的filters --> <property name="filters" value="config,stat,log4j,wall" /> <property name="connectionProperties" value="config.decrypt=false" /> </bean> <!-- 配置读数据源 --> <bean id="dataSourceRead" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本属性 url、user、password --> <property name="url" value="${jdbc.slave.url}" /> <property name="username" value="${jdbc.slave.username}" /> <property name="password" value="${jdbc.slave.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="${jdbc.slave.initialSize}" /> <property name="minIdle" value="${jdbc.slave.minIdle}" /> <property name="maxActive" value="${jdbc.slave.maxActive}" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="60000" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT '1'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 mysql false --> <property name="poolPreparedStatements" value="false" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> <!-- 配置监控统计拦截的filters --> <property name="filters" value="config,stat,log4j,wall" /> <property name="connectionProperties" value="config.decrypt=false" /> </bean> <!-- 可写的SessionFactory --> <bean id="sqlWriteSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" scope="singleton"> <property name="dataSource" ref="dataSourceWrite" /> <property name="configLocation" value="classpath:mybatis-config.xml" /> </bean> <!-- 只读的SessionFactory --> <bean id="sqlReadOnlySessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" scope="singleton"> <property name="dataSource" ref="dataSourceRead" /> <property name="configLocation" value="classpath:mybatis-config.xml" /> </bean> <!-- 可写的Session --> <bean id="writableSQLSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0" ref="sqlWriteSessionFactory" /> </bean> <!-- 只读的Session --> <bean id="readonlySQLSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0" ref="sqlReadOnlySessionFactory" /> </bean> <!-- ====================================================== Add MyBatis Support End ====================================================== --> </beans>
创建 jdbc.properties 配置文件
############################ MySQL/Oracle/SQLServer Database Configuratioin Info ###############################
# MySQL Master DB Info
jdbc.master.dialet=org.hibernate.dialect.MySQLDialect
jdbc.master.driverClassName=com.mysql.jdbc.Driver
jdbc.master.url=jdbc:mysql://127.0.0.1:3306/SSMDemo
jdbc.master.username=root
jdbc.master.password=sa
# MySQL Slave DB Info
jdbc.slave.dialet=org.hibernate.dialect.MySQLDialect
jdbc.slave.driverClassName=com.mysql.jdbc.Driver
jdbc.slave.url=jdbc:mysql://localhost:3306/SSMDemo
jdbc.slave.username=root
jdbc.slave.password=sa
############################## Connection Pool Configuration Info ##############################################
# MySQL Master DB Setting
jdbc.master.initialSize = 10
jdbc.master.minIdle = 0
jdbc.master.maxActive = 30
# MySQL Slave DB Setting
jdbc.slave.initialSize = 10
jdbc.slave.minIdle = 0
jdbc.slave.maxActive = 30
在本地 MySQL 数据库创建一个 SSMDemo 数据库，执行下面的语句创建 user 表并插入一条测试数据。
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(45) DEFAULT NULL,
`password` varchar(45) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'admin', 'password');
创建 mybatis-config.xml 文件，并配置需要扫描包路径
<?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> <mappers> <!-- 配置扫描的Mapper类 --> <package name="com.chanshuyi.dao.mapper"/> </mappers> </configuration>
下载 MBGGenerator（密码：c1dy），这是MyBatis 官方的 MyBatis Generator，我们使用它将数据库表转化成 model、mapper 以及 SqlProvider 文件。
下载文件解压放到 resources 目录下。进入 resources/mbg 目录，双击运行 generate.bat，程序自动将配置文件 resources/mbgconfig.xml 中配置的表格映射成相对应的文件。
四、开发视图层（Spring）
创建 resources/log4j.properties 文件，提供日志记录。
#Console Log
log4j.rootLogger=info, console, file
# Write to Console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=INFO
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%5p %d{MM-dd HH:mm:ss}(%F:%L): %m%n
# Write to File
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=${catalina.home}app/log/log.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%5p %d{MM-dd HH:mm:ss}(%F:%L): %m%n
在 com.chanshuyi.dao.mapper.UserMapper 类中增加 getUserListByMapSql 接口：
/** * 根据参数构造SQL进行查询 * @param param * @return */ @SelectProvider(type = UserSqlProvider.class, method = "getUserListByMapSql") List<User> getUserListByMapSql(@Param("param") Map<String, String> param);
在 UserSqlProvider 类增加对上面接口 SQL 的实现：
/** * 获取查询SQL * @param param * @return */ public String getUserListByMapSql(Map<String, Object> param) { StringBuilder builder = new StringBuilder(); Map<String, String> realParam = (Map<String, String>)param.get("param"); //add select part builder.append(" select * from user where 1 = 1 "); //add condition part String conditionStr = ""; if(!StringUtil.isNullOrEmpty(realParam)){ conditionStr = getQueryCondition(realParam); if(!StringUtil.isNullOrEmpty(conditionStr)){ builder.append(conditionStr); } } return new String(builder); } public String getQueryCondition(Map<String, String> param){ StringBuilder builder = new StringBuilder(); //if param is null or empty, return empty String if(param == null || param.size() < 1){ return ""; } for(String key : param.keySet()){ String value = param.get(key); if(value != null && !value.isEmpty()){ builder.append(" and " + key + " = '" + value + "'"); } } return new String(builder); }
上面用到了 StringUtil.java，我们在 com.chanshuyi.util 中导入它：
package com.mszz.util; import java.util.Collection; import java.util.Map; /** * 字符串工具类 * @author chenxinquan * */ public class StringUtil { /** * 判断对象或对象数组中每一个对象是否为空: 对象为null，字符序列长度为0，集合类、Map为empty * @author zl * @param obj * @return */ public static boolean isNullOrEmpty(Object obj) { if (obj == null) return true; if (obj instanceof CharSequence) return ((CharSequence) obj).length() == 0; if (obj instanceof Collection) return ((Collection) obj).isEmpty(); if (obj instanceof Map) return ((Map) obj).isEmpty(); if (obj instanceof Object[]) { Object[] object = (Object[]) obj; if (object.length == 0) { return true; } boolean empty = true; for (int i = 0; i < object.length; i++) { if (!isNullOrEmpty(object[i])) { empty = false; break; } } return empty; } return false; } } StringUtil.java
创建 com.chanshuyi.dao.impl.BaseDao.java 类，提供基本的数据库读写对象，并用注解方式将 SqlSession 注入。
package com.chanshuyi.dao.impl; import org.apache.ibatis.session.SqlSession; import org.springframework.beans.factory.annotation.Autowired; /** * 所有Service的基类，用来注入sqlSession */ public class BaseDao { /** * 可写的sqlSession */ @Autowired protected SqlSession writableSQLSession; /** * 只读的sqlSession */ @Autowired protected SqlSession readonlySQLSession; }
创建DAO层接口 IUserDao.java：
package com.chanshuyi.dao; import com.chanshuyi.model.User; import java.util.List; import java.util.Map; /** * Created by chanshuyi on 2015/12/26. */ public interface IUserDao { User getUserById(int userId); /** * * @param param Map中的key要与数据库表中的字段名相同 * @return */ User getUserByMapSql(Map<String, String> param); List<User> getUserListByMapSql(Map<String, String> param); }
创建 UserDaoImpl.java 继承 BaseDao.java、实现 IUserDao 接口，并用 @Repository 创建名称为 userDao 的对象。
package com.chanshuyi.dao.impl; import com.chanshuyi.dao.IUserDao; import com.chanshuyi.dao.mapper.UserMapper; import com.chanshuyi.model.User; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.stereotype.Repository; import java.util.List; import java.util.Map; /** * Created by Administrator on 2015/12/26. */ @Repository("userDao") public class UserDaoImpl extends BaseDao implements IUserDao { private static Log logger = LogFactory.getLog(UserDaoImpl.class); @Override public User getUserById(int userId) { UserMapper mapper = readonlySQLSession.getMapper(UserMapper.class); return mapper.selectByPrimaryKey(userId); } /** * * @param param * @return */ @Override public User getUserByMapSql(Map<String, String> param) { logger.info("getUserByMapSql 根据动态参数查询用户对象"); return getUserListByMapSql(param).size() > 0 ? getUserListByMapSql(param).get(0) : null; } /** * get**MapSql()类的方法只能用于各参数的等于查询 * 例如：select * from user where username = 1 and password = 3 （正确） * select * from user where username in (1,2,3) （错误，无法实现） * @param param * @return */ @Override public List<User> getUserListByMapSql(Map<String, String> param) { logger.info("getUserListByMapSql 根据动态参数查询用户对象列表"); UserMapper mapper = readonlySQLSession.getMapper(UserMapper.class); return mapper.getUserListByMapSql(param); } }
创建 IUserService.java 和 UserServiceImpl.java。在 UserServiceImpl 中添加 @Service 注解创建名称为 userService 的对象，并将 userDao 对象注入。
package com.mszz.service; import com.mszz.model.User; import java.util.List; import java.util.Map; /** * Created by chanshuyi on 2015/12/26. */ public interface IUserService { User getUserById(int userId); /** * * @param param Map中的key要与数据库表中的字段名相同 * @return */ User getUserByMapSql(Map<String, String> param); List<User> getUserListByMapSql(Map<String, String> param); }
package com.chanshuyi.service.impl; import com.chanshuyi.dao.IUserDao; import com.chanshuyi.model.User; import com.chanshuyi.service.IUserService; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; import java.util.Map; /** * Created by Administrator on 2015/6/18. */ @Service("userService") public class UserServiceImpl implements IUserService { private static Log logger = LogFactory.getLog(UserServiceImpl.class); @Autowired IUserDao userDao; @Override public User getUserById(int userId) { return userDao.getUserById(userId); } @Override public User getUserByMapSql(Map<String, String> param) { return userDao.getUserByMapSql(param); } @Override public List<User> getUserListByMapSql(Map<String, String> param) { return userDao.getUserListByMapSql(param); } }
五、开发控制层（Struts）
创建 com.chanshuyi.action.UserController 类
package com.chanshuyi.controller; import com.chanshuyi.service.IUserService; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import java.util.HashMap; import java.util.Map; /** * Created by Administrator on 2015/6/18. */ @Controller("userAction") @RequestMapping(value="/login") public class UserController{ private static Logger logger = LoggerFactory.getLogger(UserController.class); private String message; private String username; private String password; @Autowired private IUserService userService; @Autowired private HttpServletRequest request; @RequestMapping("") public String login(@RequestParam(value = "username", required = false) String username, @RequestParam(value = "password", required = false) String password){ try{ Map<String, String> param = new HashMap<String, String>(); param.put("username", username); param.put("password", password); if(userService.getUserByMapSql(param) != null){ message = "登录成功！"; logger.info(message); }else{ message = "登录失败！"; logger.info(message); } }catch(Exception e){ logger.warn(e.getMessage()); e.printStackTrace(); } request.setAttribute("message", message); return "index"; // 转到webapp/index.jsp页面 } /******** set/get ********/ public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
创建 webapp/index.jsp 文件
<%@page language="java" pageEncoding="UTF-8"%> <%@ page contentType="text/html;charset=utf-8" %> <%@ page isELIgnored="false"%> <html> <head> <meta charset="utf-8"> </head> <body> <h2>Hello World!</h2> <%-- 通过Struts传递参数,数据传递方式必须选择post,否则编码错误! --%> <form action="login" method="post" > <p id="message">${message}</p> <b>Username:</b><input type="text" id="name" name="username" /><br> <b>Password:</b><input type="password" id="password" name="password"/><br> <input type="submit" value="Login"/> </form> </body> </html>
修改 web.xml 文件，加载 SpringMVC 处理器
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <!-- 字符集过滤器 --> <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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- spring MVC的核心就是DispatcherServlet，使用springMVC的第一步就是将下面的servlet放入web.xml servlet-name属性非常重要，默认情况下，DispatchServlet会加载这个名字-servlet.xml的文件，如下，就会加载 dispather-servlet.xml，也是在WEN-INF目录下。--> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:/spring-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 设置dispatchservlet的匹配模式，通过把dispatchservlet映射到/，默认servlet会处理所有的请求，包括静态资源 --> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
六、启动项目测试
为工程配置 Maven 命令 “tomcat7:run”
点击启动项目
打开浏览器输入：http://localhost:5050/index.jsp
输入 admin/password，点击 Login 按钮
提示登录成功，说明项目已经成功部署好。
与 Spring 框架项目对比
因为我们一般用 SpringMVC 的时候都是用注解的形式，所以SpringMVC 框架的项目都是注解形式，没有 XML 配置文件方式。下面我们来对比一下用 SpringMVC 和用 Spring + Struts 的实现区别。
1、使用 SpringMVC 框架时需要配置与 Spring 不同的 web.xml 配置，并且读取的根配置文件不再是 applicationContext.xml，而是 servletName-servlet.xml（servletName 表示的是配置在 web.xml 中的servlet 名称）。
2、因为使用了 SpringMVC，所以不再需要 Struts 来接收用户请求，而是直接通过 @RequestMapping 注解的方式在 Controller 类上进行注解映射，也就少了 struts.xml 这个配置文件。而一般情况下用 SpringMVC 的项目更习惯于将 Action 写成 Controller。
链接：http://pan.baidu.com/s/1gdZgyqf 密码：vrm5
