Spring学习笔记1之IOC详解尽量使用注解以及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
db.properties

<?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>
mybatis.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: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>
spring-mybatis.xml

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 + "]";
}
}
User.java

@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>
UserMapper.xml

@Configuration
@ComponentScan(basePackages = {"com.everSeeker"}, excludeFilters = {
@ComponentScan.Filter(type = FilterType.CUSTOM, value = RootConfig.WebPackage.class)})
@ImportResource({"classpath:spring-mybatis.xml"})
public class RootConfig {
public static class WebPackage extends RegexPatternTypeFilter {
public WebPackage() {
super(Pattern.compile("com\\.everSeeker\\.web"));
}
}
}

public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { //继承了AbstractAnnotationConfigDispatcherServletInitializer的类会自动配置DispatcherServlet和Spring应用上下文
@Override
protected String[] getServletMappings() { //将DispatcherServlet映射到"/"
return new String[] { "/" };
}
/**
* RootConfig类用来配置ContextLoaderListener创建的应用上下文中的bean,
* 比如@Repository, @Service等组件
*/
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class };
}
/**
* DispatcherServlet加载应用上下文时,使用定义在WebConfig配置类中的bean,
* 用来加载包含Web组件的bean,比如控制器,视图解析器以及处理器映射, @Controller, @RequestMapping等
*/
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
@Override
protected void customizeRegistration(ServletRegistration.Dynamic registration) {
//限制上传文件的大小不超过2MB，整个请求不超过4M，所有上传的文件都要写到磁盘中
registration.setMultipartConfig(new MultipartConfigElement("/tmp/uploads", 2097152, 4194304, 0));
}
}

@Configuration
@EnableWebMvc
@ComponentScan("com.everSeeker.web")
public class WebConfig extends WebMvcConfigurerAdapter {
//配置jsp视图解析器
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resourceViewResolver = new InternalResourceViewResolver();
resourceViewResolver.setPrefix("/WEB-INF/views/");
resourceViewResolver.setSuffix(".jsp");
resourceViewResolver.setExposeContextBeansAsAttributes(true);
return resourceViewResolver;
}
//配置multipart解析器, 上传文件用
@Bean
public MultipartResolver multipartResolver() throws IOException {
return new StandardServletMultipartResolver();
}
//配置静态资源的处理
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}