好久没给大家弄Java后端项目系列了，因为接了Java后端外包以及学习一些后端优化的东西。而现在开始慢慢在这个系列的（三）逐渐把后端外包的一些有价值的东西分享给大家，并且自己也总结一遍嘛。
文章结构：（1）项目环境搭建；（2）简单业务逻辑测试框架；（3）项目配置注意点；（4）快速开发上手技巧；
一、项目环境搭建：
项目框架：Spring Data JPA+Spring+SpringMVC+Maven+JDK1.7+Tomcat7.0
使用IDEA开发
（1）Maven构建：
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.fuzhu</groupId>
<artifactId>springdatajpa</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>springdatajpa Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.build.timestamp.format>yyyyMMdd'T'HHmmss</maven.build.timestamp.format>
<buildNumber>${maven.build.timestamp}</buildNumber>
<maven.compiler.target>1.7</maven.compiler.target>
<maven.compiler.source>1.7</maven.compiler.source>
<java-version>1.7</java-version>
<version-springframework>4.0.4.RELEASE</version-springframework>
<version-slf4j>1.6.6</version-slf4j>
<version-hibernate.validator>5.0.1.Final</version-hibernate.validator>
<version-hibernate.jpa>1.0.1.Final</version-hibernate.jpa>
<version-hibernate>4.2.6.Final</version-hibernate>
<mysql.version>5.1.35</mysql.version>
</properties>
<dependencies>
<!-- Spring MVC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${version-springframework}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${version-springframework}</version>
</dependency>
<!-- spring 表达式语言 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${version-springframework}</version>
</dependency>
<!-- 核心工具包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${version-springframework}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${version-springframework}</version>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- spring-context 的扩展支持，用于 MVC 方面 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${version-springframework}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${version-springframework}</version>
</dependency>
<!-- springIoC（依赖注入）的基础实现 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${version-springframework}</version>
</dependency>
<!-- Spring事务支持 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${version-springframework}</version>
</dependency>
<!-- spring 对Junit 等测试框架的简单封装 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${version-springframework}</version>
</dependency>
<!--hibernate的包-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${version-hibernate}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${version-hibernate}</version>
<exclusions>
<exclusion>
<artifactId>cglib</artifactId>
<groupId>cglib</groupId>
</exclusion>
<exclusion>
<artifactId>dom4j</artifactId>
<groupId>dom4j</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${version-hibernate.validator}</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>${version-hibernate.jpa}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${version-hibernate}</version>
</dependency>
<!-- Spring data jpa -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.6.2.RELEASE</version>
</dependency>
<!-- AspectJ 切面-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.10</version>
</dependency>
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${version-slf4j}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${version-slf4j}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${version-slf4j}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
</exclusions>
<scope>runtime</scope>
</dependency>
<!-- logging end-->
<!-- @Inject -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- druid dataSource -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.0</version>
</dependency>
<!--mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- Apache Commons Dependencies -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-digester3</artifactId>
<version>3.2</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-exec</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.1</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
<!--common end-->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2.2</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.1.0</version>
</dependency>
<!-- junit测试的包-->
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
<!-- 固定版本1.7-->
<build>
<finalName>springdatajpa</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
（2）.spring配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.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">
<!--扫描资源文件-->
<context:property-placeholder location="classpath:database.properties" ignore-unresolvable="true"/>
<!--Druid数据源-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="driverClassName" value="${database.driverClassName}"/>
<property name="url" value="${database.url}" />
<property name="username" value="${database.username}" />
<property name="password" value="${database.password}" />
<!-- 申请连接时执行validationQuery检测连接是否有效，配置为true会降低性能 -->
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<!-- 申请连接的时候检测 -->
<property name="testWhileIdle" value="false" />
<!-- 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 -->
<property name="timeBetweenEvictionRunsMillis" value="1800000" />
<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="1800000" />
<property name="defaultAutoCommit" value="false" />
</bean>
<!-- 指定事务管理器，JPA使用JpaTransactionManager事务管理器实现. -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- 指定JPA实现 -->
<bean id="jpaVendorAdapter"
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="false" />
</bean>
<!-- 适用于所有环境的FactoryBean，能全面控制EntityManagerFactory配置,如指定Spring定义的DataSource等等. -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<!-- 指定持久化单元名字，即JPA配置文件中指定的 -->
<property name="persistenceUnitName" value="com.ima" />
<!-- 见上 -->
<property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
<!-- 见上 -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 映射jpa接口-->
<jpa:repositories base-package="com.ima.repository" />
<!-- 开启事务管理注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
（3）.springMVC的配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 开启SpringMVC注解 -->
<mvc:annotation-driven />
<!-- 只扫描Controller 注解 -->
<context:component-scan base-package="com.ima.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
<context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice" />
</context:component-scan>
<!-- 定义视图解析器 -->
<bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
<property name="contentType" value="text/html;charset=UTF-8"/>
</bean>
<!-- 用于返回json格式 -->
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/x-www-form-urlencoded;charset=UTF-8</value>
</list>
</property>
</bean>
<!--上传文件配置-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"/>
<property name="maxUploadSize" value="10485760"/>
<property name="maxInMemorySize" value="40960"/>
</bean>
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<!--字符串编码转换-->
<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
</beans>
（4）.数据源的配置：
database.url=jdbc:mysql://127.0.0.1:3306/aidou?useUnicode=true&characterEncoding=utf8
database.username=root
database.password=751197996
database.driverClassName=com.mysql.jdbc.Driver
（5）.log4j的日志配置（见源码）
（6）.JPA的配置包，指定持久化单元：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="com.ima" transaction-type="RESOURCE_LOCAL">
<!--ENABLE_SELECTIVE[(默认和推荐值):实体不缓存,除非明确标记为可缓存的。] DISABLE_SELECTIVE[实体缓存,除非明确标记为不缓存] NONE[无缓存] ALL[全部缓存]-->
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
<!-- 使用MySQL方言 -->
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql:///aidou" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="751197996" />
<property name="hibernate.connection.charSet" value="UTF-8" />
<!-- 自动输出schema创建DDL语句 -->
<property name="hibernate.hbm2ddl.auto" value="update" />
<!-- 显示SQL语句 -->
<property name="hibernate.show_sql" value="true" />
<!-- 在显示SQL语句时格式化语句 -->
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.use_sql_comments" value="true" />
<!--org.hibernate.cache.EhCacheRegionFactory -->
<!-- Enable Batching -->
<property name="hibernate.jdbc.batch_size" value="20" />
<property name="hibernate.default_batch_fetch_size" value="10" />
<!-- Hibernate二级缓存相关配置 -->
<!-- 开启二级缓存 -->
<property name="hibernate.cache.use_second_level_cache" value="true" />
<!-- 打开Hibernate查询缓存 -->
<property name="hibernate.cache.use_query_cache" value="true" />
<!-- 配置缓存提供者 -->
<property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory" />
<property name="hibernate.generate_statistics" value="true" />
</properties>
</persistence-unit>
</persistence>
（7）.web.xml配置
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>Archetype Created Web Application</display-name>
<!-- Spring 配置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:META-INF/spring/spring-jpa.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- log4j 系统日志-->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:META-INF/log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<!-- 使用spring Encoding,设置为UTF-8 -->
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Spring MVC 启动配置 -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:META-INF/springmvc/spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>Spring OpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
<init-param>
<!-- 指定org.springframework.orm.jpa.LocalEntityManagerFactoryBean在spring配置文件中的名称,默认值为entityManagerFactory
如果LocalEntityManagerFactoryBean在spring中的名称不是entityManagerFactory,该参数一定要指定,否则会出现找不到entityManagerFactory的例外 -->
<param-name>entityManagerFactoryBeanName</param-name>
<param-value>entityManagerFactory</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Spring OpenEntityManagerInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Druid,监控数据库,以及WEB访问连接信息 -->
<!--根据配置中的url-pattern来访问内置监控页面，如果是上面的配置，内置监控页面的首页是/druid/index.html-->
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>
<init-param>
<param-name>sessionStatMaxCount</param-name>
<param-value>1000</param-value>
</init-param>
<init-param>
<param-name>sessionStatEnable</param-name>
<param-value>false</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>DruidStatView</servlet-name>
<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
<init-param>
<!-- 允许清空统计数据 -->
<param-name>resetEnable</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<!-- 用户名 -->
<param-name>loginUsername</param-name>
<param-value>druid</param-value>
</init-param>
<init-param>
<!-- 密码 -->
<param-name>loginPassword</param-name>
<param-value>druid</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DruidStatView</servlet-name>
<url-pattern>/druid/*</url-pattern>
</servlet-mapping>
</web-app>
这样就完成了工程的配置了！！！
二、简单业务逻辑测试框架
简单的bean：（为了偷懒就用JPA自动建表了，不过后面会给出sql，而且JPA自动建表有坑！！）
//积分变化记录
@Entity
@Table(name = "i_dou_change")
public class IDouChange {
private Long id;
//积分变化的类型，拉黑或者在线或者充值
private String changeType;
private Date createTime;
//积分变化数
private Integer iDouCount;
//积分变化者
private User user;
public IDouChange() {
}
@Id
@GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name = "change_type")
public String getChangeType() {
return changeType;
}
public void setChangeType(String changeType) {
this.changeType = changeType;
}
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "create_time",nullable=true,columnDefinition="timestamp default current_timestamp")
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Column(name = "i_dou_count")
public Integer getiDouCount() {
return iDouCount;
}
public void setiDouCount(Integer iDouCount) {
this.iDouCount = iDouCount;
}
//简单的多对一
@JoinColumn(name="user_id")
@ManyToOne(fetch= FetchType.LAZY)
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
对应的repository接口dao
@Repository
public interface AiDouChangeRepository extends JpaRepository<IDouChange, Long> {
}
对应的service
@Service
public class AiDouService {
@Autowired
private AiDouChangeRepository aiDouChangeRepository;
public void save(IDouChange iDouChange){
aiDouChangeRepository.save(iDouChange);
}
}
写个测试的controller
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@Autowired
private AiDouService aiDouService;
//test：
@RequestMapping(value = "/test", method = {RequestMethod.GET, RequestMethod.POST}, produces = "text/html;charset=UTF-8")
//测试嘛
public String test(String type, Integer iDouCount ) {
DTO dto = new DTO();
IDouChange iDouChange = new IDouChange();
iDouChange.setChangeType(type);
iDouChange.setiDouCount(iDouCount);
aiDouService.save(iDouChange);
if (iDouChange == null) {
dto.code = "-1";
dto.msg = "Have bean registered";
return JSON.toJSONString(dto);
} else {
return JSON.toJSONString(iDouChange);
}
}
}
然后？？直接部署呀！！对应传参，测试成功咯！！！
这里写图片描述
一对多没实现关联，傻逼的插入就是这样的啦
这里写图片描述
三、项目配置注意点：
这里写图片描述
这里写图片描述
还有就是在web.xml中映射好spring文件以及springMVC文件
四、快速开发上手技巧：
（1）在一般项目时，使用这个框架Spring Data JPA+Spring+SpringMVC+Maven，快速映射dao层即可编写业务
（2）接口文档工具，swagger+postman，让前端移动端更快速接入
（3）数据库最好还是新建好导入，再用IDEA的persistence导入，这样的话，编码问题就不会出现太多。用IDEA的persistence导入姿势
（4）虽然不建议用jpa自动建表，因为有编码问题，不懂的人，就尴尬了，要搞很久，这个系列的第三篇博客会讲解怎么解决这个的编码问题。
好了，J2EE项目系列（三）--Spring Data JPA+Spring+SpringMVC+Maven快速开发（1）项目架构讲完了。本博客是这个系列的第一篇，所以先讲下项目架构。另外，这个系列还有一些我在外包项目过程中做的优化，七牛云，云旺IM等使用，以及解决一些小bug等等技巧，我会尽快出完给大家，分享经验给大家。欢迎在下面指出错误，共同学习！！你的点赞是对我最好的支持！！
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