针对repository层进行抽取优化
@NoRepositoryBean
public interface BaseRepository<T,ID extends Serializable> extends JpaRepository<T,ID>,JpaSpecificationExecutor<T>{
//根据Query拿到分页对象(分页)
Page findPageByQuery(BaseQuery baseQuery);
}
首先添加BaseRepositoryImpl类,实现BaseRepository接口,继承SimpleJpaRepository类,使其拥有Jpa Repository的基本方法。
我们发现Repository有两个构造函数:
l SimpleJpaRepository(JpaEntityInformation entityInformation, EntityManager entityManager)
l SimpleJpaRepository(Class domainClass, EntityManager em)
这里我们实现第二个构造函数,拿到domainClass和EntityManager两个对象
public class BaseRepositoryImpl<T,ID extends Serializable> extends SimpleJpaRepository<T,ID> implements BaseRepository<T,ID> {
private final EntityManager entityManager;
//必需要实现父类的这个构造器
public BaseRepositoryImpl(Class<T> domainClass, EntityManager em) {
super(domainClass, em);
this.entityManager = em;
}
@Override
public Page findPageByQuery(BaseQuery baseQuery) {
//第一步:拿到所有高级查询条件
Specification spec = baseQuery.createSpecification();
//第二步:拿到排序的值
Sort sort = baseQuery.createSort();
//第三步:根据条件查询分页数据并且返回
Pageable pageable = new PageRequest(baseQuery.getJpaPage(), baseQuery.getPageSize(),sort);
Page<T> page = super.findAll(spec, pageable);
return page;
}
使用自定义RepositoryFactoryBean来替代默认的RepositoryFactoryBean ,使得能让spring找到自定义的类
public class BaseRepositoryFactoryBean<T extends Repository<S, ID>, S, ID extends Serializable> extends JpaRepositoryFactoryBean<T,S,ID> {
@Override
protected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {
return new MyRepositoryFactory<T,ID>(entityManager); //注:这里创建是我们的自定义类
}
//继承JpaRepositoryFactory后,把返回的对象修改成我们自己的实现
private static class MyRepositoryFactory<T,ID extends Serializable> extends JpaRepositoryFactory{
private final EntityManager entityManager;
/**
* Creates a new {@link JpaRepositoryFactory}.
*
* @param entityManager must not be {@literal null}
*/
public MyRepositoryFactory(EntityManager entityManager) {
super(entityManager);
this.entityManager = entityManager;
}
//这里返回最后的功能对象
@Override
protected Object getTargetRepository(RepositoryInformation information) {
return new BaseRepositoryImpl<T,ID>((Class<T>)information.getDomainType(),entityManager);
}
//确定功能对象的类型
@Override
protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
return BaseRepositoryImpl.class;
}
}
}
<jpa:repositories base-package="cn.itsource.pss.repository"
transaction-manager-ref="transactionManager"
entity-manager-factory-ref="entityManagerFactory"
factory-class="cn.itsource.pss.repository.BaseRepositoryFactoryBean"
/>
抽取父接口 IBaseService
子接口IEmployeeService 继承 IBaseService并指定泛型
添加BaseServiceImpl 实现 IBaseService
添加EmployeeServiceImpl继承 IBaseService, 实现IEmployeeService
注意:泛型使用规范;
注入 BaseRepository对象时,添加泛型
@Autowired
private BaseRepository<T,ID> baseRepository;
<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>
<?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:mvc="http://www.springframework.org/schema/mvc"
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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<!-- 对静态资源进行放行 -->
<mvc:default-servlet-handler />
<!-- 扫描controller部分的包 -->
<!-- @Component组件, @Repository持久层, @Service业务逻辑层, and @Controller控制器 -->
<context:component-scan base-package="cn.itsource.pss.web" />
<!-- 添加mvc对@RequestMapping等注解的支持 -->
<mvc:annotation-driven />
<!-- ViewResolver 视图解析器 (struts2视图类型类似) -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 设置视图路径的前后缀,该配置可以让我们写视图路径的时候更简单。 -->
<!-- 希望跳转jsp是[/WEB-INF/views/前缀][xxx变量][.jsp后缀] -->
<!-- * @see #setPrefix -->
<property name="prefix" value="/WEB-INF/views/" />
<!-- * @see #setSuffix -->
<property name="suffix" value=".jsp" />
</bean>
<!-- 错误:提示告诉开发者你没有配置文件上传解析器。 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 设置上传文件的最大尺寸为1MB -->
<property name="maxUploadSize">
<value>1048576</value>
</property>
</bean>
</beans>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<!-- 读取SpringMVC -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- 启动Spring的监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 配置解决中文乱码的问题 -->
<filter>
<filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
<url-pattern>/*
dispatcher
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
classpath:applicationContext-mvc.xml
1
dispatcher
/
注意: 抽取head.jsp专门用来导入需要使用的easyui及其余共享的引入文件
employee.jsp,用来展示数据
准备一个UIpage.java,解决SpringDataJpa返回的数据和EasyUI中的数据匹配不上的问题
public class UiPage {
private long total; //总条数
private List rows; //每页数据
public UiPage(){}
public UiPage(Page page){
total = page.getTotalElements();
rows = page.getContent();
}
}
修改BaseQuery 中的参数对应
public abstract class BaseQuery {
….
//兼容Easyui的分页
public void setPage(int page) {
this.currentPage = page;
}
public void setRows(int rows) {
this.pageSize = rows;
}
}
controller层的方法(返回一个包装过的类)
//查询分页数据
@RequestMapping("/page")
@ResponseBody
public UiPage page(EmployeeQuery query){
return new UiPage(employeeService.findPageByQuery(query));
}
建立employee与department之间的关联(many2one)
配置web.xml解决noSession问题
<!-- 加上OpenEntityManager -->
<filter>
<filter-name>openEntity</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openEntity</filter-name>
<url-pattern>/*
解决department对象设置的懒加载引起的"No serializer found for class"问题
创建新类
public class CustomMapper extends ObjectMapper {
public CustomMapper() {
this.setSerializationInclusion(JsonInclude.Include.NON_NULL);
// 设置 SerializationFeature.FAIL_ON_EMPTY_BEANS 为 false
this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
}
}
配置applicationContext-mvc.xml
<!-- Spring MVC 配置 -->
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json; charset=UTF-8</value>
<value>application/x-www-form-urlencoded; charset=UTF-8</value>
</list>
</property>
<!-- No serializer:配置 objectMapper 为我们自定义扩展后的 CustomMapper,解决了返回对象有关系对象的报错问题 -->
<property name="objectMapper">
<bean class="cn.itsource.pss.common.CustomMapper"></bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
easyui返回的排序名称和类型为 sort和order ,需要更改一下 BaseQuery 中set方法中形式参数名称
employee.jsp中需要设置 sortable=“true”
<th width="20" field="username" sortable="true">用户名</th>
通过easyui扩展库查询到该方法
导入依赖的css和js文件(可在demo的f12中进行查看拷贝)
<link href="/easyui/plugin/datagrid/jeasyui.extensions.datagrid.css" rel="stylesheet" />
<script src="/easyui/plugin/menu/jeasyui.extensions.menu.js"></script>
<script src="/easyui/plugin/datagrid/jeasyui.extensions.datagrid.getColumnInfo.js"></script>
<script src="/easyui/plugin/datagrid/jeasyui.extensions.datagrid.columnToggle.js"></script>
给datagird配置enableHeaderClickMenu=“true”
<table id="employeeGrid" class="easyui-datagrid" data-options="fit:true,fixed:true,fitColumns:true,toolbar:'#tb',singleSelect:true" url="/employee/page" iconCls="icon-save" enableHeaderClickMenu="true" rownumbers="true" pagination="true">