Spring学习笔记1——IOC: 尽量使用注解以及java代码

<?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.everSeeker</groupId>
    <artifactId>register</artifactId>
    <packaging>war</packaging>
    <version>1.0</version>
    <name>register Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>4.3.1.RELEASE</spring.version>
    </properties>

    <dependencies>
        <!--spring core, context-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</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-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--test-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <!--<scope>test</scope>-->
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--springmvc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.1.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.4.Final</version>
        </dependency>
        <!--servlet-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--mysql, mybatis-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.3</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>java_config_web</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

# Database
db.mysql.driverClass = com.mysql.jdbc.Driver
db.mysql.jdbcUrl = jdbc:mysql://localhost:3306/register_notice?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
db.mysql.user = root
db.mysql.password = 333
db.minPoolSize = 10
db.maxPoolSize = 100
db.initialPoolSize = 20
db.maxIdleTime = 60
db.acquireIncrement = 5
db.maxStatements = 100
db.idleConnectionTestPeriod = 60
db.acquireRetryAttempts = 30
db.breakAfterAcquireFailure = true
db.testConnectionOnCheckout = false

<?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>

    <!--配置实体类的别名-->
    <typeAliases>
        <!--以下2种方法选其一即可。 第1种方法：使用typeAlias，为单个类设置别名。-->
        <!--<typeAlias type="com.everSeeker.entity.User" alias="User" />-->
        
        <!--第2种方法：使用package，为包下面的所有类设置别名，默认规则为com.everSeeker.entity.User设置为User，去除前面的包名。-->
        <package name="com.everSeeker.entity" />
    </typeAliases>

</configuration>

<?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:tx="http://www.springframework.org/schema/tx"
       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/context
                           http://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd">

       <!-- 在该文件中引入db.properties文件，可以保证之后的配置比如${db.mysql.driverClass}肯定能找到对应的值 -->
       <!-- 否则，如果直接在RootConfig.java中同事载入db.properties以及spring-mybatis.xml的话，不能保证db.properties先被引入，从而导致程序报错 -->
       <context:property-placeholder location="classpath:db.properties"/>

       <!--数据源配置 c3p0
           常见的数据源实现类包有2个，一个是apache的DBCP(org.apache.commons.dbcp.BasicDataSource)，另一个为C3P0。
       -->
       <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
             destroy-method="close">

              <property name="driverClass" value="${db.mysql.driverClass}" />
              <property name="jdbcUrl" value="${db.mysql.jdbcUrl}" />
              <property name="user" value="${db.mysql.user}" />
              <property name="password" value="${db.mysql.password}" />

              <!--连接池中保留的最小连接数。 -->
              <property name="minPoolSize" value="${db.minPoolSize}" />

              <!--连接池中保留的最大连接数。Default: 15 -->
              <property name="maxPoolSize" value="${db.maxPoolSize}" />

              <!--初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3 -->
              <property name="initialPoolSize" value="${db.initialPoolSize}" />

              <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->
              <property name="maxIdleTime" value="${db.maxIdleTime}" />

              <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->
              <property name="acquireIncrement" value="${db.acquireIncrement}" />

              <!--JDBC的标准参数，用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements 属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。
                  如果maxStatements与maxStatementsPerConnection均为0，则缓存被关闭。Default: 0 -->
              <property name="maxStatements" value="${db.maxStatements}" />

              <!--每60秒检查所有连接池中的空闲连接。Default: 0 -->
              <property name="idleConnectionTestPeriod" value="${db.idleConnectionTestPeriod}" />

              <!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 -->
              <property name="acquireRetryAttempts" value="${db.acquireRetryAttempts}" />

              <!--获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效 保留，并在下次调用getConnection()的时候继续尝试获取连接。如果设为true，那么在尝试
                  获取连接失败后该数据源将申明已断开并永久关闭。Default: false -->
              <property name="breakAfterAcquireFailure" value="${db.breakAfterAcquireFailure}" />

              <!--因性能消耗大请只在需要的时候使用它。如果设为true那么在每个connection提交的 时候都将校验其有效性。建议使用idleConnectionTestPeriod或automaticTestTable
                  等方法来提升连接测试的性能。Default: false -->
              <property name="testConnectionOnCheckout" value="${db.testConnectionOnCheckout}" />
       </bean>

       <!-- myBatis配置.
            classpath和classpath*的区别，参考文档：http://blog.csdn.net/zl3450341/article/details/9306983.
            classpath只会返回第一个匹配的资源，建议确定路径的单个文档使用classpath；匹配多个文档时使用classpath*.
       -->
       <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"
             p:dataSource-ref="dataSource"
             p:configLocation="classpath:mybatis.xml"
             p:mapperLocations="classpath*:mapper/*Mapper.xml" />

       <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
              <!--basePackage指定要扫描的包，在此包之下的映射器都会被搜索到。可指定多个包，包与包之间用逗号或分号分隔
                  MapperScannerConfigurer将扫描basePackage所指定包下的所有接口类(包括子包)，如果他们在SQL映射文件
                  中定义过，则将他们动态定义为一个Spring Bean. -->
              <property name="basePackage" value="com.everSeeker.dao" />
              <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
       </bean>

       <!-- 事务管理器配置, 使用jdbc事务 -->
       <bean id="transactionManager"
             class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
              <property name="dataSource" ref="dataSource" />
       </bean>

       <!-- 使用annotation定义事务，对标注了@Transactional注解的bean进行处理，以织入事务管理切面.
           默认情况下，自动使用名称为transactionManager的事务管理器。
           proxy-target-class为true，表示spring将通过创建子类来代理业务类，需要在类路径中添加CGLib.jar类库。-->
       <tx:annotation-driven transaction-manager="transactionManager"
                             proxy-target-class="true" />
</beans>

public class User {
    @Size(min = 32, max = 32, message = "uuid应该为32位字符串")
    private String id;

    @Size(min = 1, max = 32, message = "账号长度应该在1-32位之间")
    private String username;

    @NotEmpty(message = "密码不能为空")
    private String password;

    @NotEmpty(message = "email不能为空")
    @Email(message = "email格式不正确")
    private String email;

    @Size(min = 11, max = 11, message = "手机号长度为11位")
    private String cellphone;

    private long regDate;

    public User() {
        this.id = UUID.randomUUID().toString().replaceAll("-", "");
        this.regDate = 0;
    }

    public User(String username, String password, String email, String cellphone) {
        this(username, password, email, cellphone, new Date().getTime());
    }

    public User(String username, String password, String email, String cellphone, long regDate) {
        this.id = UUID.randomUUID().toString().replaceAll("-", "");
        this.username = username;
        this.password = password;
        this.email = email;
        this.cellphone = cellphone;
        this.regDate = regDate;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    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 String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getCellphone() {
        return cellphone;
    }

    public void setCellphone(String cellphone) {
        this.cellphone = cellphone;
    }

    public long getRegDate() {
        return regDate;
    }

    public void setRegDate(long regDate) {
        this.regDate = regDate;
    }

    @Override
    public String toString() {
        return "[User: id=" + id + ", username=" + username + ", password=" + password + ", email=" + email + ", cellphone=" +
                cellphone + ", regDate=" + regDate + "]";
    }
}

@Repository
public interface UserDao {
    void addUser(User user);
    User getUserByUsername(String username);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.everSeeker.dao.UserDao">
    <resultMap id="ResultMapUser" type="com.everSeeker.entity.User">
    </resultMap>

    <insert id="addUser" parameterType="User">
        INSERT INTO user(id, username, password, email, cellphone, regDate) VALUES(#{id}, #{username}, #{password}, #{email}, #{cellphone}, #{regDate})
    </insert>

    <select id="getUserByUsername" parameterType="String" resultMap="ResultMapUser">
        SELECT * FROM user WHERE username=#{username}
    </select>

</mapper>