手把手教你从最基本的Java工程搭建SpringMVC+SpringDataJPA+Hibernate(含源码下载)
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转载请注明出处:http://blog.csdn.net/anxpp/article/details/51415366,谢谢!
本文会介绍从一个最基本的java工程,到Web工程,到集成Spring、SpringMVC、SpringDataJPA+Hibernate。
平时我们可能是通过一个模板搭建一个工程,或者是直接导入一个项目,而本文选择从最基本的java工程开始,目的是为了展示更多原理。
当然,我们还是从一个最基本的Maven工程开始,其实普通的非Maven工程,搭建过程几乎是一模一样的,只是Jar包需要我们手动的添加到工程中,而Maven工程就只是修改配置文件即可。推荐几篇相关文章:
对 Spring Data JPA 更详细的介绍,请戳->Spring ORM+Hibernate?Out!换 Spring Data JPA 吧!
下面就正式开始。
1、基于Maven(如果不使用Maven也可以用传统的工程)创建最基本的Java工程
新建工程,选择Maven Project,Next:
勾选为简单的工程(Create a simple project),Next:
Group id为你的域名反序,通常跟工程源码的包名对应,Artifact id为这个Group id中工程的唯一名,根据你的爱好,怎么填都行,然后Finish:
这是得到的工程目录结构是这样的:
pom.xml就是Maven的核心文件。
2、将工程设置为动态网页模式
接下来就将工程转换为Web工程,右键打开工程属性,如图,点击左边菜单中的Project Facets,然后点击Convert to faceted from...:
在右边,我们勾选Dynamic Web Module(动态网页),然后点OK:
这时会多出一个WebContent目录:
在WEB-INF目录下,添加web.xml文件,内如如下:
-
<?
xml version
=
"1.0"
encoding
=
"UTF-8"
?>
-
<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>
SpringDataJPA
</display-name>
-
<welcome-file-list>
-
<welcome-file>
index.html
</welcome-file>
-
</welcome-file-list>
-
</web-app>
然后添加一个欢迎页index.html:
-
<html>
-
<head>
-
</head>
-
<body>
-
<h1>
Hello Word!
</h1>
-
</body>
-
</html>
这时目录结构如下:
这时,就可以右键工程,Run On Server了,可以看下效果:
3、集成Spring+SpringMVC
新建包,并添加一些接口和类(具体代码后面会列出来),包结构如图:
需要添加jar包,直接修改pom文件即可,如果为普通工程,按pom.xml中的jar包,添加到工程中即可。
首先添加使用的spring版本,方便统一管理,然后再添加所有需要的jar包,下面把此处需要的所有jar包添加进来,完成后的pom.xml如下:
-
<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.anxpp
</groupId>
-
<artifactId>
SpringDataJPA
</artifactId>
-
<version>
0.0.1-SNAPSHOT
</version>
-
<properties>
-
<!-- spring版本号 -->
-
<spring.version>
4.2.5.RELEASE
</spring.version>
-
</properties>
-
<dependencies>
-
<!-- spring核心包 -->
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-core
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-web
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-orm
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-tx
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-jdbc
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-webmvc
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-aop
</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-test
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework
</groupId>
-
<artifactId>
spring-orm
</artifactId>
-
<version>
${spring.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.springframework.data
</groupId>
-
<artifactId>
spring-data-jpa
</artifactId>
-
<version>
1.10.1.RELEASE
</version>
-
</dependency>
-
</dependencies>
-
</project>
在WEB-INF目录下添加Spring配置文件applicationContext.xml,并添加如下内容:
-
<?
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:aop
=
"http://www.springframework.org/schema/aop"
xmlns:p
=
"http://www.springframework.org/schema/p"
-
xmlns:tx
=
"http://www.springframework.org/schema/tx"
xmlns:mvc
=
"http://www.springframework.org/schema/mvc"
-
xsi:schemaLocation
=
"http://www.springframework.org/schema/beans
-
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
-
http://www.springframework.org/schema/context
-
http://www.springframework.org/schema/context/spring-context-4.2.xsd
-
http://www.springframework.org/schema/tx
-
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
-
http://www.springframework.org/schema/aop
-
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
-
http://www.springframework.org/schema/mvc
-
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd"
>
-
<!-- 开启IOC注解扫描 -->
-
<context:component-scan
base-package
=
"com.anxpp.demo"
/>
-
<!-- 开启MVC注解扫描 -->
-
<mvc:annotation-driven
/>
-
</beans>
修改web.xml,将spring添加进去:
-
<?
xml version
=
"1.0"
encoding
=
"UTF-8"
?>
-
<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>
SpringDataJPA
</display-name>
-
<listener>
-
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
-
</listener>
-
<context-param>
-
<param-name>
contextConfigLocation
</param-name>
-
<param-value>
WEB-INF/applicationContext.xml
</param-value>
-
</context-param>
-
<servlet>
-
<servlet-name>
springmvc
</servlet-name>
-
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
-
</servlet-class>
-
<init-param>
-
<param-name>
contextConfigLocation
</param-name>
-
<param-value>
classpath*:springmvc-servlet.xml
</param-value>
-
</init-param>
-
<load-on-startup>
1
</load-on-startup>
-
</servlet>
-
<servlet-mapping>
-
<servlet-name>
springmvc
</servlet-name>
-
<url-pattern>
/*
</url-pattern>
-
</servlet-mapping>
-
<welcome-file-list>
-
<welcome-file>
index.html
</welcome-file>
-
</welcome-file-list>
-
</web-app>
下面开始编写代码,注意注解不要忘记写,在本小节开始部分已经给出了包的层次结构。
实体User:
-
package
com
.
anxpp
.
demo
.
core
.
entity
;
-
public
class
User
{
-
private
Integer
id
;
-
private
String
name
;
-
public
User
(
Integer
id
,
String
name
)
{
-
this
.
id
=
id
;
-
this
.
name
=
name
;
-
}
-
public
Integer
getId
()
{
-
return
id
;
-
}
-
public
void
setId
(
Integer
id
)
{
-
this
.
id
=
id
;
-
}
-
public
String
getName
()
{
-
return
name
;
-
}
-
public
void
setName
(
String
name
)
{
-
this
.
name
=
name
;
-
}
-
@Override
-
public
String
toString
()
{
-
return
"id:"
+
id
+
",name:"
+
name
;
-
}
-
}
dao层接口UserDao:
-
package
com
.
anxpp
.
demo
.
core
.
dao
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
public
interface
UserDao
{
-
User
getUser
(
Integer
id
,
String
name
);
-
}
dao层实现UserDaoImpl:
-
package
com
.
anxpp
.
demo
.
core
.
dao
.
impl
;
-
import
org
.
springframework
.
stereotype
.
Repository
;
-
import
com
.
anxpp
.
demo
.
core
.
dao
.
UserDao
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
@Repository
-
public
class
UserDaoImpl
implements
UserDao
{
-
@Override
-
public
User
getUser
(
Integer
id
,
String
name
)
{
-
return
new
User
(
id
,
name
);
-
}
-
}
service层接口UserService:
-
package
com
.
anxpp
.
demo
.
core
.
service
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
public
interface
UserService
{
-
User
getUser
(
Integer
id
,
String
name
);
-
}
service层实现:
-
package
com
.
anxpp
.
demo
.
core
.
service
.
impl
;
-
import
org
.
springframework
.
beans
.
factory
.
annotation
.
Autowired
;
-
import
org
.
springframework
.
stereotype
.
Service
;
-
import
com
.
anxpp
.
demo
.
core
.
dao
.
UserDao
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
import
com
.
anxpp
.
demo
.
core
.
service
.
UserService
;
-
@Service
-
public
class
UserServiceImpl
implements
UserService
{
-
@Autowired
-
UserDao
userDao
;
-
@Override
-
public
User
getUser
(
Integer
id
,
String
name
)
{
-
return
userDao
.
getUser
(
id
,
name
);
-
}
-
}
controller层DemoController:
-
package
com
.
anxpp
.
demo
.
controller
;
-
import
org
.
springframework
.
beans
.
factory
.
annotation
.
Autowired
;
-
import
org
.
springframework
.
stereotype
.
Controller
;
-
import
org
.
springframework
.
web
.
bind
.
annotation
.
RequestMapping
;
-
import
org
.
springframework
.
web
.
bind
.
annotation
.
ResponseBody
;
-
import
com
.
anxpp
.
demo
.
core
.
service
.
UserService
;
-
@Controller
-
@RequestMapping
(
"/"
)
-
public
class
demoController
{
-
@Autowired
-
UserService
userService
;
-
@RequestMapping
(
"/"
)
-
@ResponseBody
-
public
String
index
(){
-
return
"index"
;
-
}
-
@RequestMapping
(
"/getuser"
)
-
@ResponseBody
-
public
String
getUser
(
Integer
id
,
String
name
){
-
return
userService
.
getUser
(
id
,
name
).
toString
();
-
}
-
}
这是还不能直接Run On Server,因为jar包不会被一同发布,我们需要如下配置:
右键工程选择属性,按下图配置:
这时候就可以运行测试了,效果如下:
到这里,我们还没有操作数据库的。
4、添加返回Json格式数据支持
现在,我们常使用json作为数据传输的格式,下面就为SpringMVC添加返回json的支持
首先添加jar包:
-
<dependency>
-
<groupId>
com.fasterxml.jackson.core
</groupId>
-
<artifactId>
jackson-databind
</artifactId>
-
<version>
2.5.0
</version>
-
</dependency>
-
<dependency>
-
<groupId>
com.fasterxml.jackson.core
</groupId>
-
<artifactId>
jackson-core
</artifactId>
-
<version>
2.5.0
</version>
-
</dependency>
-
<dependency>
-
<groupId>
com.fasterxml.jackson.core
</groupId>
-
<artifactId>
jackson-annotations
</artifactId>
-
<version>
2.5.0
</version>
-
</dependency>
然后改写getUser()方法如下:
-
@RequestMapping
(
"/getuser"
)
-
@ResponseBody
-
public
Map
<
String
,
Object
>
getUser
(
Integer
id
,
String
name
){
-
Map
<
String
,
Object
>
map
=
new
HashMap
<
String
,
Object
>();
-
map
.
put
(
"state"
,
"success"
);
-
map
.
put
(
"data"
,
userService
.
getUser
(
id
,
name
));
-
return
map
;
-
}
重新运行后访问效果如下:
此时,就可以返回json数据了。
5、配置静态资源访问
通常情况下,WEB-INF目录下的资源,我们是无法直接访问的,如果我们的网站是html+ajax构成的,那么就可以在WEB-INF之外新建html的目录,并为web.xml配置默认的过滤器,不过注意要放到SpingMVC过滤器之前:
-
<servlet-mapping>
-
<servlet-name>
default
</servlet-name>
-
<url-pattern>
*.html
</url-pattern>
-
</servlet-mapping>
如果一定要访问WEB-INF目录内的资源,通过查阅Spring官方文档,发现有两种方式:
1、手写一个资源映射器:
-
@Configuration
-
@EnableWebMvc
-
public
class
WebConfig
extends
WebMvcConfigurerAdapter
{
-
@Override
-
public
void
addResourceHandlers
(
ResourceHandlerRegistry
registry
)
{
-
registry
.
addResourceHandler
(
"/resources/**"
)
-
.
addResourceLocations
(
"/public-resources/"
)
-
.
setCacheControl
(
CacheControl
.
maxAge
(
1
,
TimeUnit
.
HOURS
).
cachePublic
());
-
}
-
}
可以看到,还可以设置缓存时间的,而更简单的方式,就是xml配置:
-
<mvc:resources
mapping
=
"/resources/**"
location
=
"/public-resources/"
>
-
<mvc:cache-control
max-age
=
"3600"
cache-public
=
"true"
/>
-
</mvc:resources>
也可以加上下面的这个:
-
<!-- 对静态资源文件的访问,将无法mapping到Controller的path交给default servlet handler处理-->
-
<mvc:default-servlet-handler
/>
6、乱码解决
我们通常使用ajax提交请求,但也常用地址栏直接测试。请求提交分get和post。
使用post提交请求是,一般是不会出现中文乱码的,但是如果确实出现了乱码,可以通过在web.xml添加一个编码过滤器解决:
-
<filter>
-
<filter-name>
CharacterEncoding
</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>
CharacterEncoding
</filter-name>
-
<url-pattern>
/*
</url-pattern>
-
</filter-mapping>
上面只能解决post的中文乱码,对于get(含浏览器地址栏直接提交方式),我们需要修改tomcat配置,在conf目录下的server.xml中找到并如下修改:
-
<Connector
connectionTimeout
=
"20000"
port
=
"8080"
protocol
=
"HTTP/1.1"
redirectPort
=
"8443"
URIEncoding
=
"UTF-8"
/>
如果我们只是测试,项目并没有部署,可以直接在eclipse中的server下,找到server.xml,做出上面一样的改动即可:
7、整合SpringDataJPA+Hibernate
你可以通过这篇文字了解JPA:JPA规范介绍及实例(Java数据持久化解决方案)
SpringDataJPA也正是这样一种轻量级的解决方案,而首选的Hibernate就实现了JPA。
首先还是jar包,SpringDataJPA的jar包,在之前整合Spring时已经一并加入,下面是Hibernate(和mysql驱动)的jar包:
-
<!-- hibernate -->
-
<dependency>
-
<groupId>
org.hibernate
</groupId>
-
<artifactId>
hibernate-core
</artifactId>
-
<version>
${hibernate.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.hibernate
</groupId>
-
<artifactId>
hibernate-ehcache
</artifactId>
-
<version>
${hibernate.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.hibernate
</groupId>
-
<artifactId>
hibernate-entitymanager
</artifactId>
-
<version>
${hibernate.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
org.hibernate
</groupId>
-
<artifactId>
hibernate-c3p0
</artifactId>
-
<version>
${hibernate.version}
</version>
-
</dependency>
-
<dependency>
-
<groupId>
mysql
</groupId>
-
<artifactId>
mysql-connector-java
</artifactId>
-
<version>
5.1.9
</version>
-
</dependency>
统一管理的版本为:
-
<!-- hibernate 版本号 -->
-
<hibernate.version>
5.1.0.Final
</hibernate.version>
添加Jpa的配置文件persistence.xml到META-INF目录下,本文介绍时数据库使用MySQL。并添加如下内容:
-
<?
xml version
=
"1.0"
encoding
=
"UTF-8"
?>
-
<persistence
version
=
"1.0"
-
xmlns
=
"http://java.sun.com/xml/ns/persistence"
-
xmlns:xsi
=
"http://www.w3.org/2001/XMLSchema-instance"
-
xsi:schemaLocation
=
"http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
>
-
<persistence-unit
name
=
"demo"
transaction-type
=
"RESOURCE_LOCAL"
>
-
<!-- provider>org.eclipse.persistence.jpa.PersistenceProvider</provider -->
-
<provider>
org.hibernate.ejb.HibernatePersistence
</provider>
-
<class>
com.ninelephas.meerkat.pojo.User
</class>
-
<!-- MYSql 的连接 -->
-
<properties>
-
<property
name
=
"hibernate.connection.driver_class"
value
=
"com.mysql.jdbc.Driver"
/>
-
<property
name
=
"hibernate.connection.url"
value
=
"jdbc:mysql://127.0.0.1:3306/demo?createDatabaseIfNotExist=true"
/>
-
<property
name
=
"hibernate.connection.username"
value
=
"root"
/>
-
<property
name
=
"hibernate.connection.password"
value
=
"root"
/>
-
<property
name
=
"hibernate.dialect"
value
=
"org.hibernate.dialect.MySQLDialect"
/>
-
</properties>
-
</persistence-unit>
-
</persistence>
Spring配置文件applicationContext.xml中增加JPA支持后的完整内容:
-
<?
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:aop
=
"http://www.springframework.org/schema/aop"
xmlns:p
=
"http://www.springframework.org/schema/p"
-
xmlns:tx
=
"http://www.springframework.org/schema/tx"
xmlns:mvc
=
"http://www.springframework.org/schema/mvc"
-
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-4.2.xsd
-
http://www.springframework.org/schema/context
-
http://www.springframework.org/schema/context/spring-context-4.2.xsd
-
http://www.springframework.org/schema/tx
-
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
-
http://www.springframework.org/schema/aop
-
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
-
http://www.springframework.org/schema/mvc
-
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
-
http://www.springframework.org/schema/data/jpa
-
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"
>
-
<!-- 开启IOC注解扫描 -->
-
<context:component-scan
base-package
=
"com.anxpp.demo"
/>
-
<bean
id
=
"entityManagerFactory"
-
class
=
"org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
>
-
<property
name
=
"jpaVendorAdapter"
>
-
<bean
class
=
"org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
>
-
<property
name
=
"generateDdl"
value
=
"true"
/>
-
<property
name
=
"database"
value
=
"MYSQL"
/>
-
</bean>
-
</property>
-
<property
name
=
"persistenceUnitName"
value
=
"demo"
/>
-
</bean>
-
<!-- 开启MVC注解扫描 -->
-
<mvc:annotation-driven
/>
-
<bean
-
class
=
"org.springframework.web.servlet.view.ContentNegotiatingViewResolver"
>
-
<property
name
=
"viewResolvers"
>
-
<list>
-
<bean
-
class
=
"org.springframework.web.servlet.view.InternalResourceViewResolver"
>
-
<property
name
=
"prefix"
value
=
"/WEB-INF/view/"
/>
-
<property
name
=
"suffix"
value
=
".html"
/>
-
</bean>
-
</list>
-
</property>
-
<!-- 用于将对象转换为 JSON -->
-
<property
name
=
"defaultViews"
>
-
<list>
-
<bean
-
class
=
"org.springframework.web.servlet.view.json.MappingJackson2JsonView"
/>
-
</list>
-
</property>
-
</bean>
-
<!-- 对静态资源文件的访问,将无法mapping到Controller的path交给default servlet handler处理 -->
-
<mvc:default-servlet-handler
/>
-
<!-- 配置事务管理器 -->
-
<bean
id
=
"transactionManager"
class
=
"org.springframework.orm.jpa.JpaTransactionManager"
>
-
<property
name
=
"entityManagerFactory"
ref
=
"entityManagerFactory"
/>
-
</bean>
-
<!-- 启用 annotation事务 -->
-
<tx:annotation-driven
transaction-manager
=
"transactionManager"
/>
-
<!-- 配置Spring Data JPA扫描目录 -->
-
<jpa:repositories
base-package
=
"com.anxpp.demo"
/>
-
</beans>
修改实体:
-
package
com
.
anxpp
.
demo
.
core
.
entity
;
-
import
javax
.
persistence
.
Entity
;
-
import
javax
.
persistence
.
GeneratedValue
;
-
import
javax
.
persistence
.
GenerationType
;
-
import
javax
.
persistence
.
Id
;
-
import
javax
.
persistence
.
Table
;
-
@Entity
-
@Table
-
public
class
User
{
-
@Id
-
@GeneratedValue
(
strategy
=
GenerationType
.
AUTO
)
-
private
Integer
id
;
-
private
String
name
;
-
public
User
()
{
-
}
-
public
User
(
String
name
)
{
-
this
.
name
=
name
;
-
}
-
public
Integer
getId
()
{
-
return
id
;
-
}
-
public
void
setId
(
Integer
id
)
{
-
this
.
id
=
id
;
-
}
-
public
String
getName
()
{
-
return
name
;
-
}
-
public
void
setName
(
String
name
)
{
-
this
.
name
=
name
;
-
}
-
@Override
-
public
String
toString
()
{
-
return
"id:"
+
id
+
",name:"
+
name
;
-
}
-
}
可以删掉dao层实现了,我们记住将dao层接口继承自强大的JpaRepository:
-
public
interface
UserDao
extends
JpaRepository
<
User
,
Serializable
>{
-
User
findById
(
Integer
id
);
-
}
是不是看上去特别简洁,而且都不需要写实现的,SpringDataJPA会自动帮我们完成。
修改service层接口:
-
package
com
.
anxpp
.
demo
.
core
.
service
;
-
import
java
.
util
.
List
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
public
interface
UserService
{
-
User
findById
(
Integer
id
);
-
User
save
(
String
name
);
-
List
<
User
>
findAll
();
-
}
修改service层实现:
-
package
com
.
anxpp
.
demo
.
core
.
service
.
impl
;
-
import
java
.
util
.
List
;
-
import
org
.
springframework
.
beans
.
factory
.
annotation
.
Autowired
;
-
import
org
.
springframework
.
stereotype
.
Service
;
-
import
com
.
anxpp
.
demo
.
core
.
dao
.
UserDao
;
-
import
com
.
anxpp
.
demo
.
core
.
entity
.
User
;
-
import
com
.
anxpp
.
demo
.
core
.
service
.
UserService
;
-
@Service
-
public
class
UserServiceImpl
implements
UserService
{
-
@Autowired
-
UserDao
userDao
;
-
@Override
-
public
User
findById
(
Integer
id
)
{
-
return
userDao
.
findById
(
id
);
-
}
-
@Override
-
public
User
save
(
String
name
)
{
-
return
userDao
.
save
(
new
User
(
name
));
-
}
-
@Override
-
public
List
<
User
>
findAll
()
{
-
return
userDao
.
findAll
();
-
}
-
}
修改controller,提供多个测试接口:
-
package
com
.
anxpp
.
demo
.
controller
;
-
import
java
.
util
.
HashMap
;
-
import
java
.
util
.
Map
;
-
import
org
.
springframework
.
beans
.
factory
.
annotation
.
Autowired
;
-
import
org
.
springframework
.
stereotype
.
Controller
;
-
import
org
.
springframework
.
web
.
bind
.
annotation
.
RequestMapping
;
-
import
org
.
springframework
.
web
.
bind
.
annotation
.
ResponseBody
;
-
import
com
.
anxpp
.
demo
.
core
.
service
.
UserService
;
-
@Controller
-
@RequestMapping
(
"/"
)
-
public
class
demoController
{
-
@Autowired
-
UserService
userService
;
-
@RequestMapping
(
"/"
)
-
@ResponseBody
-
public
String
index
(){
-
return
"index"
;
-
}
-
@RequestMapping
(
"/info"
)
-
public
String
info
(){
-
return
"info"
;
-
}
-
@RequestMapping
(
"/findall"
)
-
@ResponseBody
-
public
Map
<
String
,
Object
>
getUser
(){
-
Map
<
String
,
Object
>
map
=
new
HashMap
<
String
,
Object
>();
-
map
.
put
(
"state"
,
"success"
);
-
map
.
put
(
"data"
,
userService
.
findAll
());
-
return
map
;
-
}
-
@RequestMapping
(
"/findbyid"
)
-
@ResponseBody
-
public
Map
<
String
,
Object
>
findById
(
Integer
id
){
-
Map
<
String
,
Object
>
map
=
new
HashMap
<
String
,
Object
>();
-
map
.
put
(
"state"
,
"success"
);
-
map
.
put
(
"data"
,
userService
.
findById
(
id
));
-
return
map
;
-
}
-
@RequestMapping
(
"/add"
)
-
@ResponseBody
-
public
Map
<
String
,
Object
>
save
(
String
name
){
-
Map
<
String
,
Object
>
map
=
new
HashMap
<
String
,
Object
>();
-
map
.
put
(
"state"
,
"success"
);
-
map
.
put
(
"data"
,
userService
.
save
(
name
));
-
return
map
;
-
}
-
}
运行效果:
那么,如果需要添加一个查找id大于指定值的指定姓氏的数据呢?
如果是SQL,我们会这样写(?表示参数):
-
SELECT
*
FROM user WHERE id
>?
AND name like
‘?%‘
;
但是这里,我们连SQL(或者HQL)都可以不用写,直接在dao层接口添加一个方法即可:
-
List
<
User
>
findByIdGreaterThanAndNameLike
(
Integer
id
,
String
name
);
你不需要怀疑,上面的方法执行偏偏就是能成功(注意:service实现的使用,调用该方法记得name+"%")!
源码:
github地址:https://github.com/anxpp/SpringMVC-SpringDataJpa-Hibernate-Demo
本地下载:SpringMVC + Spring Data JPA + Hibernate
CSDN下载(不需要积分):http://download.csdn.net/download/anxpp/9520498
原文:http://blog.csdn.net/anxpp/article/details/51415366
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