玩转SSH（四）：Struts + Spring + MyBatis
一、创建 SSMDemo 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 SSMDemo。
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 Struts、MyBatis、Spring、MySQL、Druid、JUnit、Log4J 等的依赖 Jar 包：
<!-- ********************** Struts ********************** --> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>${struts.version}</version> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-spring-plugin</artifactId> <version>${struts.version}</version> </dependency> <!-- Struts 注解 --> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-convention-plugin</artifactId> <version>${struts.version}</version> </dependency> <!-- ********************** MyBatis ********************** --> <!-- MyBatis 核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.1.1</version> </dependency> <!-- 添加mybatis与Spring整合的核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.1.1</version> </dependency> <!-- ********************** Spring ********************** --> <!-- 添加Spring-core包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${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>${commonsLogging.version}</version> </dependency> <!--添加aspectjweaver包 --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.5</version> </dependency> <!-- ********************** DB Connection ********************** --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.21</version> </dependency> <!-- Druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.6</version> </dependency> <!-- ********************** 其他 ********************** --> <!-- 单元测试 JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${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：
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3 <modelVersion>4.0.0</modelVersion> 4 <groupId>com.chanshuyi.SSMDemo</groupId> 5 <artifactId>SSMDemo</artifactId> 6 <packaging>war</packaging> 7 <version>1.0-SNAPSHOT</version> 8 <name>SSMDemo Maven Webapp</name> 9 <url>http://maven.apache.org</url> 10 11 <!-- 声明全局属性 --> 12 <properties> 13 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 14 <struts.version>2.3.24</struts.version> 15 <springframework.version>4.1.6.RELEASE</springframework.version> 16 <junit.version>3.8.1</junit.version> 17 <commonsLogging.version>1.2</commonsLogging.version> 18 </properties> 19 20 <dependencies> 21 <!-- ********************** Struts ********************** --> 22 <dependency> 23 <groupId>org.apache.struts</groupId> 24 <artifactId>struts2-core</artifactId> 25 <version>${struts.version}</version> 26 </dependency> 27 <dependency> 28 <groupId>org.apache.struts</groupId> 29 <artifactId>struts2-spring-plugin</artifactId> 30 <version>${struts.version}</version> 31 </dependency> 32 <!-- Struts 注解 --> 33 <dependency> 34 <groupId>org.apache.struts</groupId> 35 <artifactId>struts2-convention-plugin</artifactId> 36 <version>${struts.version}</version> 37 </dependency> 38 39 <!-- ********************** MyBatis ********************** --> 40 <!-- MyBatis 核心包 --> 41 <dependency> 42 <groupId>org.mybatis</groupId> 43 <artifactId>mybatis</artifactId> 44 <version>3.1.1</version> 45 </dependency> 46 <!-- 添加mybatis与Spring整合的核心包 --> 47 <dependency> 48 <groupId>org.mybatis</groupId> 49 <artifactId>mybatis-spring</artifactId> 50 <version>1.1.1</version> 51 </dependency> 52 53 <!-- ********************** Spring ********************** --> 54 <!-- 添加Spring-core包 --> 55 <dependency> 56 <groupId>org.springframework</groupId> 57 <artifactId>spring-core</artifactId> 58 <version>${springframework.version}</version> 59 </dependency> 60 <!-- 添加spring-tx包 --> 61 <dependency> 62 <groupId>org.springframework</groupId> 63 <artifactId>spring-tx</artifactId> 64 <version>${springframework.version}</version> 65 </dependency> 66 <!-- Spring ORM 相关--> 67 <dependency> 68 <groupId>org.springframework</groupId> 69 <artifactId>spring-orm</artifactId> 70 <version>${springframework.version}</version> 71 </dependency> 72 <!-- 添加spring-jdbc包 --> 73 <dependency> 74 <groupId>org.springframework</groupId> 75 <artifactId>spring-jdbc</artifactId> 76 <version>${springframework.version}</version> 77 </dependency> 78 <!--添加spring-web包 --> 79 <dependency> 80 <groupId>org.springframework</groupId> 81 <artifactId>spring-web</artifactId> 82 <version>${springframework.version}</version> 83 </dependency> 84 <!-- 添加spring-context包 --> 85 <dependency> 86 <groupId>org.springframework</groupId> 87 <artifactId>spring-context</artifactId> 88 <version>${springframework.version}</version> 89 </dependency> 90 <dependency> 91 <groupId>org.springframework</groupId> 92 <artifactId>spring-beans</artifactId> 93 <version>${springframework.version}</version> 94 </dependency> 95 <dependency> 96 <groupId>commons-logging</groupId> 97 <artifactId>commons-logging</artifactId> 98 <version>${commonsLogging.version}</version> 99 </dependency> 100 <!--添加aspectjweaver包 --> 101 <dependency> 102 <groupId>org.aspectj</groupId> 103 <artifactId>aspectjweaver</artifactId> 104 <version>1.8.5</version> 105 </dependency> 106 107 <!-- ********************** DB Connection ********************** --> 108 <dependency> 109 <groupId>mysql</groupId> 110 <artifactId>mysql-connector-java</artifactId> 111 <version>5.1.21</version> 112 </dependency> 113 <!-- Druid --> 114 <dependency> 115 <groupId>com.alibaba</groupId> 116 <artifactId>druid</artifactId> 117 <version>1.0.6</version> 118 </dependency> 119 120 <!-- ********************** 其他 ********************** --> 121 <!-- 单元测试 JUnit --> 122 <dependency> 123 <groupId>junit</groupId> 124 <artifactId>junit</artifactId> 125 <version>${junit.version}</version> 126 <scope>test</scope> 127 </dependency> 128 <!-- 日志记录 Log4j --> 129 <dependency> 130 <groupId>org.slf4j</groupId> 131 <artifactId>slf4j-api</artifactId> 132 <version>1.7.6</version> 133 </dependency> 134 <dependency> 135 <groupId>org.slf4j</groupId> 136 <artifactId>slf4j-log4j12</artifactId> 137 <version>1.7.6</version> 138 </dependency> 139 </dependencies> 140 141 142 <build> 143 <finalName>SSMDemo</finalName> 144 <plugins> 145 <!-- Maven的Tomcat插件（支持Maven以"tomcat7:run"方式启动web项目） --> 146 <plugin> 147 <groupId>org.apache.tomcat.maven</groupId> 148 <artifactId>tomcat7-maven-plugin</artifactId> 149 <version>2.1</version> 150 <configuration> 151 <port>5050</port> 152 <path>/</path> 153 <uriEncoding>UTF-8</uriEncoding> 154 <finalName>mgr</finalName> 155 <server>tomcat7</server> 156 </configuration> 157 </plugin> 158 </plugins> 159 </build> 160 </project>
三、开发模型层（MyBatis）
创建 resources/applicationContext.xml 文件。
1 <beans xmlns="http://www.springframework.org/schema/beans" 2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" 3 xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:task="http://www.springframework.org/schema/task" 6 xsi:schemaLocation=" 7 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd 8 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 9 http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd 10 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 11 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 12 http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"> 15 16 <!-- ================================== import sub-config file ================================== --> 17 <import resource="spring-mybatis.xml" /> 18 <!-- ================================== /import sub-config file ================================== --> 19 </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。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 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"> 6 7 <!-- 引入外部properties文件 --> 8 <context:property-placeholder location="classpath:jdbc.properties" /> 9 10 <!-- ====================================================== Add MyBatis Support Start ====================================================== --> 11 <!-- 配置写数据源 --> 12 <bean id="dataSourceWrite" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> 13 <!-- 基本属性 url、user、password --> 14 <property name="url" value="${jdbc.master.url}" /> 15 <property name="username" value="${jdbc.master.username}" /> 16 <property name="password" value="${jdbc.master.password}" /> 17 <!-- 配置初始化大小、最小、最大 --> 18 <property name="initialSize" value="${jdbc.master.initialSize}" /> 19 <property name="minIdle" value="${jdbc.master.minIdle}" /> 20 <property name="maxActive" value="${jdbc.master.maxActive}" /> 21 <!-- 配置获取连接等待超时的时间 --> 22 <property name="maxWait" value="60000" /> 23 <!-- 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 --> 24 <property name="timeBetweenEvictionRunsMillis" value="60000" /> 25 <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> 26 <property name="minEvictableIdleTimeMillis" value="300000" /> 27 <property name="validationQuery" value="SELECT '1'" /> 28 <property name="testWhileIdle" value="true" /> 29 <property name="testOnBorrow" value="true" /> 30 <property name="testOnReturn" value="false" /> 31 <!-- 打开PSCache，并且指定每个连接上PSCache的大小 mysql false --> 32 <property name="poolPreparedStatements" value="false" /> 33 <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> 34 <!-- 配置监控统计拦截的filters --> 35 <property name="filters" value="config,stat,log4j,wall" /> 36 <property name="connectionProperties" value="config.decrypt=false" /> 37 </bean> 38 <!-- 配置读数据源 --> 39 <bean id="dataSourceRead" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> 40 <!-- 基本属性 url、user、password --> 41 <property name="url" value="${jdbc.slave.url}" /> 42 <property name="username" value="${jdbc.slave.username}" /> 43 <property name="password" value="${jdbc.slave.password}" /> 44 <!-- 配置初始化大小、最小、最大 --> 45 <property name="initialSize" value="${jdbc.slave.initialSize}" /> 46 <property name="minIdle" value="${jdbc.slave.minIdle}" /> 47 <property name="maxActive" value="${jdbc.slave.maxActive}" /> 48 <!-- 配置获取连接等待超时的时间 --> 49 <property name="maxWait" value="60000" /> 50 <!-- 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 --> 51 <property name="timeBetweenEvictionRunsMillis" value="60000" /> 52 <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> 53 <property name="minEvictableIdleTimeMillis" value="300000" /> 54 <property name="validationQuery" value="SELECT '1'" /> 55 <property name="testWhileIdle" value="true" /> 56 <property name="testOnBorrow" value="false" /> 57 <property name="testOnReturn" value="false" /> 58 <!-- 打开PSCache，并且指定每个连接上PSCache的大小 mysql false --> 59 <property name="poolPreparedStatements" value="false" /> 60 <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> 61 <!-- 配置监控统计拦截的filters --> 62 <property name="filters" value="config,stat,log4j,wall" /> 63 <property name="connectionProperties" value="config.decrypt=false" /> 64 </bean> 65 66 <!-- 可写的SessionFactory --> 67 <bean id="sqlWriteSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" scope="singleton"> 68 <property name="dataSource" ref="dataSourceWrite" /> 69 <property name="configLocation" value="classpath:mybatis-config.xml" /> 70 </bean> 71 <!-- 只读的SessionFactory --> 72 <bean id="sqlReadOnlySessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" scope="singleton"> 73 <property name="dataSource" ref="dataSourceRead" /> 74 <property name="configLocation" value="classpath:mybatis-config.xml" /> 75 </bean> 76 77 <!-- 可写的Session --> 78 <bean id="writableSQLSession" class="org.mybatis.spring.SqlSessionTemplate"> 79 <constructor-arg index="0" ref="sqlWriteSessionFactory" /> 80 </bean> 81 <!-- 只读的Session --> 82 <bean id="readonlySQLSession" class="org.mybatis.spring.SqlSessionTemplate"> 83 <constructor-arg index="0" ref="sqlReadOnlySessionFactory" /> 84 </bean> 85 <!-- ====================================================== Add MyBatis Support End ====================================================== --> 86 </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
<?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; } }
创建 com.chanshuyi.dao.impl.BaseDao.java 类，提供基本的数据库读写对象。
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 */protected SqlSession writableSQLSession; /** * 只读的sqlSession */protected SqlSession readonlySQLSession; public void setWritableSQLSession(SqlSession writableSQLSession) { this.writableSQLSession = writableSQLSession; } public void setReadonlySQLSession(SqlSession readonlySQLSession) { this.readonlySQLSession = 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：
package com.mszz.dao.impl; import com.mszz.dao.mapper.UserMapper; import com.mszz.model.User; import com.mszz.dao.IUserDao; 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. */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); } /** * dsafdsf * @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：
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 java.util.List; import java.util.Map; /** * Created by Administrator on 2015/6/18. */ public class UserServiceImpl implements IUserService { private static Log logger = LogFactory.getLog(UserServiceImpl.class); 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); } public IUserDao getUserDao() { return userDao; } public void setUserDao(IUserDao userDao) { this.userDao = userDao; } }
配置 applicationContext.xml 文件，加入对 Dao 和 Service 的创建：
<!-- UserDao 服务 --> <bean id="useDao" class="com.chanshuyi.dao.impl.UserDaoImpl"> <property name="readonlySQLSession" ref="readonlySQLSession"/> <property name="writableSQLSession" ref="writableSQLSession"/> </bean> <!-- UserService 服务 --> <bean id="userService" class="com.chanshuyi.service.impl.UserServiceImpl"> <property name="userDao" ref="useDao"/> </bean> <!-- UserAction 服务 --> <bean id="userAction" class="com.chanshuyi.action.UserAction"> <property name="userService" ref="userService"/> </bean>
修改后的 applicationContext.xml 文件为：
<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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation=" http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"> <!-- UserDao 服务 --> <bean id="useDao" class="com.chanshuyi.dao.impl.UserDaoImpl"> <property name="readonlySQLSession" ref="readonlySQLSession"/> <property name="writableSQLSession" ref="writableSQLSession"/> </bean> <!-- UserService 服务 --> <bean id="userService" class="com.chanshuyi.service.impl.UserServiceImpl"> <property name="userDao" ref="useDao"/> </bean> <!-- UserAction 服务 --> <bean id="userAction" class="com.chanshuyi.action.UserAction"> <property name="userService" ref="userService"/> </bean> <!-- ================================== import sub-config file ================================== --> <import resource="spring-mybatis.xml" /> <!-- ================================== /import sub-config file ================================== --> </beans>
五、开发控制层（Struts）
创建 com.chanshuyi.action.UserAction 类
package com.chanshuyi.action; import com.chanshuyi.service.IUserService; import com.opensymphony.xwork2.ActionSupport; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.HashMap; import java.util.Map; /** * Created by Administrator on 2015/6/18. */ public class UserAction extends ActionSupport { private static Logger logger = LoggerFactory.getLogger(UserAction.class); private String message; private String username; private String password; private IUserService userService; public String login(){ 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); return SUCCESS; }else{ message = "登录失败！"; logger.info(message); return INPUT; } }catch(Exception e){ logger.warn(e.getMessage()); e.printStackTrace(); return INPUT; } } /******** 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; } public IUserService getUserService() { return userService; } public void setUserService(IUserService userService) { this.userService = userService; } }
创建 struts.xml 配置文件
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <!-- 指定Spring装配Action对象的方式，与objectFactory相关联（有4个取值：name 按照名称、type按照类型，auto，constructor） --> <constant name="struts.objectFactory.spring.autoWire" value="name"/> <!-- 所有匹配*.action的请求都由struts2处理 --> <constant name="struts.action.extension" value="action" /> <!-- 是否启用开发模式(开发时设置为true,发布到生产环境后设置为false) --> <constant name="struts.devMode" value="true" /> <!-- struts配置文件改动后，是否重新加载(开发时设置为true,发布到生产环境后设置为false) --> <constant name="struts.configuration.xml.reload" value="true" /> <!-- 设置浏览器是否缓存静态内容(开发时设置为false,发布到生产环境后设置为true) --> <constant name="struts.serve.static.browserCache" value="false" /> <!-- 请求参数的编码方式 --> <constant name="struts.i18n.encoding" value="utf-8" /> <!-- 每次HTTP请求系统都重新加载资源文件，有助于开发(开发时设置为true,发布到生产环境后设置为false) --> <constant name="struts.i18n.reload" value="true" /> <!-- 文件上传最大值 --> <constant name="struts.multipart.maxSize" value="104857600" /> <!-- 让struts2支持动态方法调用,使用叹号访问方法 --> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <!-- Action名称中是否还是用斜线 --> <constant name="struts.enable.SlashesInActionNames" value="false" /> <!-- 允许标签中使用表达式语法 --> <constant name="struts.tag.altSyntax" value="true" /> <!-- 相当于普通xml配置中的extends，指定默认的继承包 --> <constant name="struts.convention.default.parent.package" value="struts-default" /> <!-- 结果资源所在路径，这个地方要注意，详见下面解释 --> <constant name="struts.convention.result.path" value="/jspPage" /> <!-- 指定以那些后缀结尾的java类package包被搜索，以发现注解 --> <constant name="struts.convention.package.locators" value="web,action" /> <!-- 对于WebLogic,Orion,OC4J此属性应该设置成true --> <constant name="struts.dispatcher.parametersWorkaround" value="false" /> <!-- Action 映射配置 --> <package name="basePackage" extends="struts-default"> <!-- 1. Struts 自己处理 --> <!-- 访问路径：http://localhost:5050/index.jsp --> <action name="user_login" class="com.chanshuyi.action.UserAction" method="login"> <result name="success">/index.jsp</result> <result name="input">/index.jsp</result> </action> </package> </struts>
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.action" 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>
配置 web.xml 文件，使项目启动的时候加载 Struts 核心过滤器和 Spring 核心监听器。
<web-app version="2.5" 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_2_5.xsd">
<display-name>SSMDemo : A Demo of Struts + Spring + MyBatis</display-name>
<!-- Spring 配置文件 -->
<!-- 1.配置spring配置文件位置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
<!--<param-value>classpath*:applicationContext-*.xml</param-value>-->
</context-param>
<!-- 2.Struts核心过滤器 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 3.Spring核心监听器 -->
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
</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，提示登录成功
