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>

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

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/txhttp://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;}@Overridepublic String toString() {return "[User: id=" + id + ", username=" + username + ", password=" + password + ", email=" + email + ", cellphone=" +cellphone + ", regDate=" + regDate + "]";}}User.java

@Repositorypublic 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@Overrideprotected 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*/@Overrideprotected 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*/@Overrideprotected Class<?>[] getServletConfigClasses() {return new Class<?>[] { WebConfig.class };}@Overrideprotected 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@Beanpublic 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@Beanpublic MultipartResolver multipartResolver() throws IOException {return new StandardServletMultipartResolver();}//配置静态资源的处理@Overridepublic void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {configurer.enable();}}