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  • java入门之java教程之利用idea创建一个基本的smm项目（带增删

环境  idea  jdk1.8  tomcat  mysql

打开idea选择创建一个maven项目

然后点击next，next，finsh

然后看项目的结构

如图所示

接着创建com包，再在com包下新建四个包，分别命名为：

 

自定义pom.xml

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<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>com.li</groupId>
 <artifactId>ssm_test_2</artifactId>
 <version>1.0-SNAPSHOT</version>
 <packaging>war</packaging>

 <name>ssm_test_2 Maven Webapp</name>
 <!-- 用来设置版本号 -->
 <properties>
   <srping.version>4.0.2.RELEASE</srping.version>
   <mybatis.version>3.2.8</mybatis.version>
   <slf4j.version>1.7.12</slf4j.version>
   <log4j.version>1.2.17</log4j.version>
   <druid.version>1.0.9</druid.version>
 </properties>
 <!-- 用到的jar包 -->
 <dependencies>
   <!-- servlet依赖的jar包start -->
   <dependency>
     <groupId>javax.servlet</groupId>
     <artifactId>javax.servlet-api</artifactId>
   </dependency>
   <!-- servlet依赖的jar包start -->

   <!-- jsp依赖jar包start -->
   <dependency>
     <groupId>javax.servlet.jsp</groupId>
     <artifactId>javax.servlet.jsp-api</artifactId>
     <version>2.3.1</version>
   </dependency>
   <!-- 单元测试 -->
   <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
     <version>4.11</version>
     <!-- 表示开发的时候引入，发布的时候不会加载此包 -->
     <scope>test</scope>
   </dependency>

   <!-- spring框架包 -->
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-test</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-core</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-oxm</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-tx</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-jdbc</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-aop</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-context</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-context-support</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-expression</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-orm</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-web</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-webmvc</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <!-- spring框架包 -->
   <!-- mybatis框架包 -->
   <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis</artifactId>
     <version>${mybatis.version}</version>
   </dependency>
   <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis-spring</artifactId>
     <version>1.2.2</version>
   </dependency>
   <!-- mybatis框架包 -->
   <!-- 数据库驱动 -->
   <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>5.1.35</version>
   </dependency>
   <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
   <dependency>
     <groupId>commons-dbcp</groupId>
     <artifactId>commons-dbcp</artifactId>
     <version>1.2.2</version>
   </dependency>
   <!-- jstl标签类 -->
   <dependency>
     <groupId>jstl</groupId>
     <artifactId>jstl</artifactId>
     <version>1.2</version>
   </dependency>
   <!-- log -->
   <dependency>
     <groupId>log4j</groupId>
     <artifactId>log4j</artifactId>
     <version>${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>
   <!-- 连接池 -->
   <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>${druid.version}</version>
   </dependency>
 </dependencies>

 <build>
   <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
   <resources>
     <resource>
       <directory>src/main/java</directory>
       <includes>
         <include>**/*.properties</include>
         <include>**/*.xml</include>
       </includes>
       <filtering>false</filtering>
     </resource>
     <resource>
       <directory>src/main/resources</directory>
       <includes>
         <include>**/*.properties</include>
         <include>**/*.xml</include>
       </includes>
       <filtering>false</filtering>
     </resource>
   </resources>
   <!-- java编译插件,如果maven的设置里配置好jdk版本就不用 -->
   <plugins>
     <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-compiler-plugin</artifactId>
       <version>3.2</version>
       <configuration>
         <source>1.8</source>
         <target>1.8</target>
         <encoding>UTF-8</encoding>
       </configuration>
     </plugin>
   </plugins>
 </build>
</project>
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在resource包下新建Directory:mapper(用来放xxMapper.xml)

添加jdbc.properties和lo4j.properties文件

jdbc.properties

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driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/test
username=root
password=123456

initialSize=0

maxActive=20

maxIdle=20

minIdle=1

maxWait=60000
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lo4j.properties文件

复制代码
log4j.rootLogger=DEBUG,CONSOLE,file
#log4j.rootLogger=ERROR,ROLLING_FILE
log4j.logger.com.qhit.dao=debug
log4j.logger.com.ibatis=debug
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
log4j.logger.java.sql.Connection=debug
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug
log4j.logger.java.sql.ResultSet=debug
log4j.logger.org.tuckey.web.filters.urlrewrite.UrlRewriteFilter=debug

######################################################################################
# Console Appender  日志在控制输出配置

######################################################################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=error
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern= [%p] %d %c - %m%n


######################################################################################
# DailyRolling File  每天产生一个日志文件，文件名格式:log2009-09-11
######################################################################################
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=yyyy-MM-dd
log4j.appender.file.File=log.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=error
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n


log4j.logger.com.opensymphony.xwork2=error
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然后创建applicationContext.xm

复制代码
<?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: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-3.1.xsd
                       http://www.springframework.org/schema/tx
                       http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

  <!-- 加载properties文件 -->
  <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
     <property name="location" value="classpath:jdbc.properties"/>
  </bean>

  <!-- 配置数据源 -->
  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
     <property name="driverClassName" value="${driver}"/>
     <property name="url" value="${url}"/>
     <property name="username" value="${username}"/>
     <property name="password" value="${password}"/>
  </bean>

  <!-- mybatis和spring完美整合，不需要mybatis的配置映射文件 -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
     <property name="dataSource" ref="dataSource"/>
     <!-- 扫描model包 -->
     <property name="typeAliasesPackage" value="com.lwy.pojo"/>
     <!-- 扫描sql配置文件:mapper需要的xml文件-->
     <property name="mapperLocations" value="classpath:mapper/*.xml"/>
  </bean>

  <!-- Mapper动态代理开发，扫描dao接口包-->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
     <!-- 注入sqlSessionFactory -->
     <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
     <!-- 给出需要扫描Dao接口包 -->
     <property name="basePackage" value="com.lwy.mapper"/>
  </bean>

  <!-- 事务管理 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
     <!--数据库连接池-->
     <property name="dataSource" ref="dataSource"/>
  </bean>
</beans>
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创建sping-mvc.xml

复制代码
<?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.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

  <!-- 扫描注解，这样com.xjt包下的文件都能被扫描 -->
  <context:component-scan base-package="com.lwy"/>

  <!-- 开启SpringMVC注解模式 -->
  <mvc:annotation-driven/>

  <!-- 静态资源默认servlet配置 -->
  <mvc:default-servlet-handler/>

  <!-- 配置返回视图的路径，以及识别后缀是jsp文件 -->
  <bean class
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