1. Project construction preparation
1. Build Maven web project
2. Import the jar package required by the project
<?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.xwq</groupId>
<artifactId>aisell</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>aisell Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<!-- Set version number-->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<org.springframework.version>4.2.5.RELEASE</org.springframework.version>
<org.hibernate.version>4.3.8.Final</org.hibernate.version>
<spring-data-jpa.version>1.9.0.RELEASE</spring-data-jpa.version>
<com.fasterxml.jackson.version>2.5.0</com.fasterxml.jackson.version>
<org.slf4j.version>1.6.1</org.slf4j.version>
</properties>
<dependencies>
<!-- Spring Support package -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!--Code generator template support package-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${org.springframework.version}</version>
<scope>test</scope>
</dependency>
<!-- Introduce web Front end support -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- SpringMCV Upload needs to use io package-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<!-- Package for file upload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
<!-- SpringMVC Of json Support package -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<!-- hibernate Support package -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<!-- SpringData Support package -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data-jpa.version}</version>
</dependency>
<!-- SpringData Extension package -->
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.1</version>
<!-- Remove all dependence -->
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- Test package -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<!-- this scope It can only be used in compilation and test, and has no transitivity. Indicates that this is not added when running jar file -->
<scope>provided</scope>
</dependency>
<!-- log file -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j.version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<!-- Code generator template technology -->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6</version>
</dependency>
<!-- shiro Support package -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-all</artifactId>
<version>1.4.0</version>
<type>pom</type>
</dependency>
<!-- shiro And Spring Integration package -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.4.0</version>
</dependency>
<!-- poi Supportive jar package -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.11</version>
</dependency>
<!-- Picture compression -->
<!-- thumbnail -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.6</version>
</dependency>
<!-- Scheduled scheduling -->
<dependency>
<groupId>quartz</groupId>
<artifactId>quartz</artifactId>
<version>1.5.2</version>
</dependency>
<!-- Mail Support -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.15.v20140411</version>
<configuration>
<stopPort>9966</stopPort>
<stopKey>foo</stopKey>
<webAppConfig>
<contextPath>/</contextPath>
</webAppConfig>
</configuration>
</plugin>
</plugins>
</build>
</project>
3. Configure the spring configuration file
<?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:jpa="http://www.springframework.org/schema/data/jpa"
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
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
<!--Component scan-->
<!-- Can handle@Repository, @Service, and @Controller,@Autowired,@PersistenceContext annotation-->
<context:component-scan base-package="com.xwq.service" />
<!-- Load jdbc.properties -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--Configure connection pool-->
<!-- destroy-method="close current bean When destroying, it will call close Method, close connection" -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" >
<!-- Properties required for dependency injection connection pool,jdbc Four attributes -->
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!--maxActive: Maximum number of connections -->
<property name="maxActive" value="150" />
<!--minIdle: Minimum free connection -->
<property name="minIdle" value="5" />
<!--maxIdle: Maximum free connection -->
<property name="maxIdle" value="20" />
<!--initialSize: Initialize connection -->
<property name="initialSize" value="30" />
<!-- Used to configure automatic connection after database disconnection. -->
<!-- Whether to print when the connection is leaked -->
<property name="logAbandoned" value="true" />
<!--removeAbandoned: Whether to automatically recycle the timeout connection -->
<property name="removeAbandoned" value="true" />
<!--removeAbandonedTimeout: Timeout time(In seconds) -->
<property name="removeAbandonedTimeout" value="10" />
<!--maxWait: Timeout wait time in milliseconds 1000 equals 60 seconds -->
<property name="maxWait" value="1000" />
<!-- Time value to sleep during idle connection collector thread run,In Milliseconds . -->
<property name="timeBetweenEvictionRunsMillis" value="10000" />
<!-- On every idle connection the recycler thread(If there is)Number of connections checked at run time -->
<property name="numTestsPerEvictionRun" value="10" />
<!-- 1000 * 60 * 30 Connections remain idle in the pool without being idle connection collector threads -->
<property name="minEvictableIdleTimeMillis" value="10000" />
<property name="validationQuery" value="SELECT NOW() FROM DUAL" />
</bean>
<!--To configure entityManagerFactory-->
<!-- org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter Introducing default entityManagerFactory Name -->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<!--injection DataSource-->
<property name="dataSource" ref="dataSource"/>
<!--2.Which package to scan from@Entity，domain package-->
<property name="packagesToScan" value="com.xwq.domain" />
<!-- 3.To configure JPA Implementation -->
<!--jpa Adapter-->
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<!--dialect-->
<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
<!--Table creation (table creation strategy) true->update false->Do nothing)-->
<property name="generateDdl" value="false"/>
<!--Whether to display sql-->
<property name="showSql" value="true"/>
</bean>
</property>
</bean>
<!--Configuration transaction-->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- Configure support for transactions(Support adding transactions with annotations)It will find one by default. transactionManager Of bean-->
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- Spring Data Jpa To configure *-->
<!-- base-package:Scanned package -->
<jpa:repositories base-package="com.xwq.repository" transaction-manager-ref="transactionManager"
entity-manager-factory-ref="entityManagerFactory" />
</beans>
4. Configure db.properties
5. Create a domain and extract the parent class
Because the domain has id attribute, and in order to facilitate future expansion of functions, extract the parent class, and use @ MappedSuperclass to indicate that this is a parent class.
@MappedSuperclass
public class BaseDomain {
@Id
@GeneratedValue
protected Long id;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
}
2. Use of springdatajpa
1.pom.xml configuration
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data-jpa.version}</version>
</dependency>
2. Basic configuration of springdatajpa
(1) configure the corresponding spring data JPA
<jpa:repositories base-package="cn.itsource.aisell.repository"
entity-manager-factory-ref="entityManagerFactory"
transaction-manager-ref="transactionManager"
></jpa:repositories>
(2) inherit jparepository (specify domain type and primary key type)
interface EmployeeRepository extends JpaRepository<Employee,Long>, JpaSpecificationExecutor<Employee>
(3) complete corresponding CRUD
employeeRepository.findAll(); employeeRepository.findOne(Long id); employeeRepository.save(object); //Add or modify employeeRepository.delete(id/object); employeeRepository.findAll(Pageable) -> paging Pageable pageable = new PageRequest(0, 5); //0 is the first page employeeRepository.findAll(Sort) -> sort Sort sort = new Sort(Sort.Direction.DESC,"username");
If you want to combine paging and sorting: (transfer sorting objects to paging)
new PageRequest(0, 5,sort);
(4) advanced query
①. Name rule (define the method according to the specification, and SpringDataJpa will automatically proxy the implementation interface)
findByUsername(String username) //Query username =? findByUsernameLike(String username) //username like ? findByUsernameLikeAndEmailLike(String username,String email) // username like ? and email like ?
②. Query annotation
//jpql
@Query("select o from Employee o where o.name like ?1")
@Query("select o from Employee o where o.name like :name")
//Native sql
@Query(nativeQuery = true,value="select * from employee")
(5) advanced query and paging
①.JpaSpecificationExecutor
You can complete the function without writing SQL
1. Our Repository inherits jpaspecification executor
EmployeeRepository extends JpaRepository<Employee,Long>,JpaSpecificationExecutor<Employee>
2.findAll query method
employeeRepository.findAll(Specification<T> spec)
employeeRepository.findAll(Specification<T> spec,Pageable pageable)
new Specification<Employee>{
//Root: (root, table) get field
//query:where,group by ,order by...
//cb: conditional judgment (one or more)
@Override
public Predicate toPredicate(Root<Employee> root,
CriteriaQuery<?> query,
CriteriaBuilder cb) {
Path path = root.get("username");//Get the field to query
Predicate p = cb.like(path, "%1%");//like stands for fuzzy query, followed by its condition value
return p;
}
}
2.jpa-spec
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.0</version>
</dependency>
//First parameter: true - > enable conditional filtering
//Second parameter: attributes to be filtered
//The third parameter: filter condition? Corresponding value
Specification<Person> specification = Specifications.<Person>and()
.eq(StringUtils.isNotBlank(request.getName()), "name", name)
.gt(Objects.nonNull(request.getAge()), "age", 18)
.build();