一、配置项标题目中pom.xml
主要作用:导包 和 设置版本
<?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>cn.itsource</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>
<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的支持包 -->
<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>
<!-- 上下文支持包(帮我们集成:模板,邮件,任务调度...) -->
<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>
<!-- 引入web前端的支持 -->
<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上传需要用到io包-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<!-- 文件上传用到的包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
<!-- SpringMVC的json支持包 -->
<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>${com.fasterxml.jackson.version}</version>
</dependency>
<!-- hibernate的支持包 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<!-- SpringDataJpa的支持包 -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data-jpa.version}</version>
</dependency>
<!-- SpringData的擴展包 -->
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.1</version>
<!-- 把所有的依賴都去掉 -->
<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>
<!--lang3:工具包 java.lang.-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- 測試包 -->
<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>
<!-- 这个scope 只能作用在编译和测试时,同时没有传递性。表示在运行的时候不添加此jar文件 -->
<scope>provided</scope>
</dependency>
<!-- 日志文件 -->
<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>
<!-- 代码生成器模版技术 -->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6</version>
</dependency>
<!-- shiro(权限框架)的支持包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-all</artifactId>
<version>1.4.0</version>
<type>pom</type>
</dependency>
<!-- shiro与Spring的集成包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.4.0</version>
</dependency>
<!-- poi(操作办公软件)支持的jar包 -->
<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>
<!-- 图片压缩功能 -->
<!-- 缩略图 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.6</version>
</dependency>
<!-- 定时调度 -->
<dependency>
<groupId>quartz</groupId>
<artifactId>quartz</artifactId>
<version>1.5.2</version>
</dependency>
<!-- 邮件支持 -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
<build>
<finalName>aisell</finalName>
<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>
二、集成SpringDataJpa
2.1配置jdbc.propeties
主要作用:连接数据库的配置文件
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///ssp
jdbc.username=root
jdbc.password=123456
2.2配置applicationContext.xml
主要配置:
开启扫描、读取jdbc.properties、配置连接池、开启事务注解支持
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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"
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/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">
<!--扫描service层的类-->
<context:component-scan base-package="cn.itsource.aisell.service" />
<!--
db.properties -> dataSource(配置数据源[连接池dbcp]) -> EntityManagerFactory -> dao -> service
-> 事务 -> controller(集成SpringMVC) -> easyui
-->
<!--1.读取db.properties, 注意:不要忘了加classpath-->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--2.配置dbcp连接池-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!--
JPA:ORM规范 -> 很多框架实现了这个规范(hibernate,openjpa,toplink,...)
3.配置EntityManagerFactory对象
3.1 基本配置都是写在Spring中(四大金刚,建表策略,方言,是否显示SQL)
3.2 Spring来创建这个对象(准备一个domain,如果运行的时候创建了表,就代表这个对象是成功的)
alt+insert -> JPA -> LocalContainerEntityManagerFactoryBean
ctrl+t/f4 : 有办法看结构
-->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--扫描JPA支持的注解-->
<property name="packagesToScan" value="cn.itsource.aisell.domain" />
<!--
告诉Spring我们使用的是哪一个框架来完成JPA规范
这里就需要我们配置一个适配器
jpaVendorAdapter:JPA需要配置的适配器(我们会选择hibernate)
-->
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<!--方言-->
<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
<!--
建表策略(已经有表有数据,不要删除了)
-->
<property name="generateDdl" value="false" />
<!--是否显示sql-->
<property name="showSql" value="true" />
</bean>
</property>
</bean>
<!--4.加上事务-->
<!--4.1 准备事务管理器-->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<!--4.2 开启(注解)事务支持-->
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
三、集成SpringDataJpa
用来简化基于Spring构建的持久层框架的框架,使数据库访问变得方便快捷,减少代码量
用对象的角度操作数据库
3.1准备domain
3.1.1表对应的实体类
注意事项
在类上加上注解交给jpa管理
继承父类
@Entity
@Table(name = "表名")
3.1.2实体类的父类
父类的作用
方便扩展
公共的代码
制定规范
注意事项@MappedSuperclass
1.注解使用在父类上面,是用来标识父类的作用
2.标识的类表示其不能映射到数据库表,因为其不是一个完整的实体类,但是它所拥有的属性能够映射在 其子类对用的数据库表中
3.标识得类不能再有@Entity或@Table注解 但是可以使用@Id 和@Column注解
@MappedSuperclass
public class BaseDomain {
@Id
@GeneratedValue
protected Long id;
}
3.2Repository(dao层)
注意事项
继承JpaRepository就可以使用其增删改查的普通方法
public interface EmployeeRepository extends JpaRepository<Employee,Long> {
...
}
扫描repository
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
...
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
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/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
">
...
<!-- 让SpringDataJpa去扫描repository -->
<jpa:repositories base-package="cn.itsource.aisell.repository"
<!-- 配置bean工厂-->
entity-manager-factory-ref="entityManagerFactory"
<!-- 配置事务-->
transaction-manager-ref="transactionManager" />
</beans>
四、CRUD功能
4.1增删改查
@Autowired
private EmployeeRepository employeeRepository;
查询所有
employeeRepository.findAll()
查询一条数据:
employeeRepository.findOne(1L)
添加/修改
employeeRepository.save(employee)
删除
employeeRepository.delete(1L)
4.2 分页和排序
4.2.1 排序
注意事项
排序对象
第一个参数:排序的类型升序(ASC)还是降序(DESC)
第二个参数:排序的属性
Sort sort = new Sort(Sort.Direction.DESC,"属性");
List<Employee> list = employeeRepository.findAll(sort);
list.forEach(e-> System.out.println(e));
4.2.2 分页
注意事项
page:第几页(0就是第1页)
size:每页条数
Pageable pageable = new PageRequest(第几页,每页条数);
//在查询时,直接传入分页对象
Page<Employee> list = employeeRepository.findAll(pageable);
list.forEach(e-> System.out.println(e));
4.2.3 分页+排序
注意事项
直接在创建分页对象时,第三个参数传入排序对象
Sort sort = new Sort(Sort.Direction.DESC,"age");
Pageable pageable = new PageRequest(0,10,sort);
Page<Employee> list = employeeRepository.findAll(pageable);
list.forEach(e-> System.out.println(e));
4.3 根据条件进行查询
注意事项
根据文档中对应的命名规范写方法名
//根据用户名查询一个员工
Employee findByUsername(String username);
//用户名模糊查询
List<Employee> findByUsernameLike(String username);
//用户名与邮件模糊查询
List<Employee> findByUsernameLikeAndEmailLike(String username,String email);
4.4 Query注解查询
Query注解可以自己写jpql或者sql进行查询
//根据用户名获取用户
@Query("select o from Employee o where o.username =?1")
Employee query01(String username);
//用户名与邮件模糊查询
@Query("select o from Employee o where o.username like ?1 and o.email like ?2")
List<Employee> query02(String username,String email);
// @Query("select o from Employee o where o.username like :username and o.email like :email")
// List<Employee> query02(@Param("username") String username,@Param("email") String email);
//直接写原生的SQL
@Query(nativeQuery=true,value="select * from employee")
List<Employee> query03();
五.JpaSpecificationExecutor
注意事项
需要repository(dao)继承JpaSpecificationExecutor接口
gt/lt:大于/小于 ge/le:大于等于/小等等于
5.1 最简单的查询
root:获取到实体对应的字段
query: 组合条件(一般不用)
cb :相当于条件或者条件组合
Predicate:做成的一个查询语句
@Test
public void testJpaSpecificationExecutor01() throws Exception{
List<Employee> list = employeeRepository.findAll(new Specification<Employee>() {
@Override
public Predicate toPredicate(Root<Employee> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
//1.拿到Employee中的username字段
Path usernamePath = root.get("username");
//2.加上字段的判断关系
Predicate p1 = cb.like(usernamePath, "%1%");
return p1;
}
});
list.forEach(e-> System.out.println(e));
}
5.2 多个条件查询
@Test
public void testJpaSpecificationExecutor02() throws Exception{
//Specification:查询规则
List<Employee> list = employeeRepository.findAll(new Specification<Employee>() {
// root:拿到字段(表达式) cb:设置条件(>,<,=,like),and/or
@Override
public Predicate toPredicate(Root<Employee> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
//拿到属性并设置条件
Path usernamePath = root.get("username");
Predicate p1 = cb.like(usernamePath, "%1%");
Path emailPath = root.get("email");
Predicate p2 = cb.like(emailPath, "%2%");
Path agePath = root.get("age");
Predicate p3 = cb.gt(agePath, 18);
//把条件结合起来
return cb.and(p1, p2, p3);
}
});
list.forEach(e-> System.out.println(e));
}
5.3 查询+分页+排序
//加上分页和排序功能
@Test
public void testJpaSpecificationExecutor04() throws Exception{
//创建一个排序对象并添加到分页对象中 再添加到
Sort sort = new Sort(Sort.Direction.DESC,"age");
Pageable pageable = new PageRequest(0,10,sort);
Page<Employee> page = employeeRepository.findAll(new Specification<Employee>() {
@Override
public Predicate toPredicate(Root<Employee> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
Path usernamePath = root.get("username");
return cb.like(usernamePath, "%1%");
}
}, pageable);//传入规则执行者最后一个参数
page.forEach(e->System.out.println(e));
}
六.jpa-spec
把JpaSpecificationExecutor变得更加简单的
文档说明: https://github.com/wenhao/jpa-spec/blob/master/docs/3.1.0_cn.md
6.1 简单查询
注意事项
导包 com.github.wenhao.jpa.Specifications;
//jpa-spec
//不要忘记最后的build();
@Test
public void testJpaSpec01() throws Exception{
Specification<Employee> spec = Specifications.<Employee>and()
.like("username", "%1%")
.build();
List<Employee> list = employeeRepository.findAll(spec);
list.forEach(e-> System.out.println(e));
}
6.2 多条件查询
//jpa-spec
//完成咱们的简单查询 username like ? and email like ? and age>?
@Test
public void testJpaSpec02() throws Exception{
Specification<Employee> spec = Specifications.<Employee>and()
.like("username", "%1%")
.like("email","%2%")
.gt("age",18)
.build();
List<Employee> list = employeeRepository.findAll(spec);
list.forEach(e-> System.out.println(e));
}
6.3 多条件+分页+排序
@Test
public void testJpaSpec03() throws Exception{
//创建排序对象并传入分页对象中
Sort sort = new Sort(Sort.Direction.DESC,"age");
Pageable pageable = new PageRequest(0,10,sort);
Specification<Employee> spec = Specifications.<Employee>and()
.like("username", "%1%")
.build();
//功能执行时 传入规则和分页对象
Page<Employee> page = employeeRepository.findAll(spec, pageable);
page.forEach(e-> System.out.println(e));
}
七.Query抽取
7.1 BaseQuery
注意事项
抽取相同的分页对象
currrentPage 当前页数
pageSize 每页条数
orderType 排序的类型 true(DESC)/false(ASC)
orderName 排序的字段
让每个子类都有一个:createSpec()
解决传过来的是当前页从1开始(SpringDataJpa是从0开始计算)问题
public abstract class BaseQuery {
private int currentPage=1;
private int pageSize=10;
private boolean orderType;
private String orderName;
//创建排序对象
public Sort createSort(){
//判断是否排序
if(StringUtils.isNotBlank(orderName)){
Sort sort = new Sort(orderType?Sort.Direction.DESC:Sort.Direction.ASC,orderName);
return sort;
}
return null;
}
//子类必须实现
public abstract Specification createSpec();
public int getJpaPage() {
//解决页数问题
return currentPage-1;
}
}
7.2 EmployeeQuery
子类的特殊字段查询
public class EmployeeQuery extends BaseQuery {
private String username;
private String email;
private Integer age;
//复写自己需要的查询规则
@Override
public Specification createSpec(){
Specification<Employee> specification = Specifications.<Employee>and()
.like(StringUtils.isNotBlank(username), "username", "%" + username + "%")
.like(StringUtils.isNotBlank(email), "email", "%" + email + "%")
.gt(age != null, "age", age)
.build();
return specification;
}
}
7.3 测试
@Test
public void testJpaSpec04() throws Exception{
//模仿前台传过来的数据
EmployeeQuery query = new EmployeeQuery();
// query.setUsername("1");
// query.setEmail("2");
query.setAge(18);
query.setOrderName("age");
query.setOrderType(true);
//创建排序对象
Sort sort = query.createSort();
//创建分页对象(分页对象从前台传过来)
Pageable pageable = new PageRequest(query.getJpaPage(),query.getPageSize(),sort);
//规则对象(查询条件)
Specification<Employee> spec = query.createSpec();
//功能执行
Page<Employee> page = employeeRepository.findAll(spec, pageable);
page.forEach(e-> System.out.println(e));
}
来源:CSDN
作者:古娜拉黑暗之源
链接:https://blog.csdn.net/weixin_46002365/article/details/103483852