SSH(進階) SpringDataJPA + SpringMVC 快速搭建企業框架

1、什麼是JPA？

    JPA是Java Persistence API的簡稱，中文名Java持久層API，是JDK 5.0註解或XML描述對象－關係表的映射關係，並將運行期的實體對象持久化到數據庫中。

    事實上，JPA並不是一項技術，而是一種標準，因爲JPA只是一套接口，本身不能完成任何事情。JPA只是規範了Java持久化的官方標準。JPA有以下幾個優點。

1、 可持久化Java對象。(JPA能夠直接持久化複雜的Java對象，並能夠使用JPQL語言進行復雜的查詢)

2、 使用簡單。(JPA使用註釋（Annotation）定義Java對象與關係數據庫之間的映射)

2、什麼是SpringData?

    Spring Data是一個用於簡化數據庫訪問，並支持雲服務的開源框架。其主要目標是使得對數據的訪問變得方便快捷，並支持map-reduce框架和雲計算數據服務。 

    主要來看看Spring Data JPA提供的接口，也是Spring Data JPA的核心概念：

1、Repository：最頂層的接口，是一個空的接口，目的是爲了統一所有Repository的類型，且能讓組件掃描的時候自動識別。
2、CrudRepository ：是Repository的子接口，提供CRUD的功能
3、PagingAndSortingRepository：是CrudRepository的子接口，添加分頁和排序的功能

4、JpaRepository：是PagingAndSortingRepository的子接口，增加了一些實用的功能，比如：批量操作等。
5、JpaSpecificationExecutor：用來做負責查詢的接口
6、Specification：是Spring Data JPA提供的一個查詢規範，要做複雜的查詢，只需圍繞這個規範來設置查詢條件即可

**在本篇文章我們主要是運用 JpaRespository 這個接口.**

3、搭建SpringDataJPA和SpringMVC框架

1、首先我們來看看項目結構:

a、新建Maven工程:打開eclipse ->file->new->project->Maven->Maven Project

選擇 maven-archetype-webapp 下一步;

填Group Id 和 Artifact id,Group Id 是域名,Artifact id填項目名稱就行了

b、項目建好之後就是導Maven包，這裏我們引入Pom.xml 文件:

<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.ajie.wechat</groupId>
    <artifactId>ajie-wechat</artifactId>
    <packaging>jar</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>ajie-wechat</name>
    <url>http://maven.apache.org</url>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.3.11.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.3.11.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>4.3.11.Final</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>com.jolbox</groupId>
            <artifactId>bonecp</artifactId>
            <version>0.8.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.jolbox</groupId>
            <artifactId>bonecp-spring</artifactId>
            <version>0.8.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.jolbox</groupId>
            <artifactId>bonecp-provider</artifactId>
            <version>0.8.0-alpha1</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.6.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.avro</groupId>
            <artifactId>avro</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.2</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>net.sf.ezmorph</groupId>
            <artifactId>ezmorph</artifactId>
            <version>1.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.23</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.20.0-GA</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.3.0.Final</version>
        </dependency>
        <!-- jackson -->
        <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>
        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.7.1.RELEASE</version>
        </dependency>

    </dependencies>
    <build>
        <plugins>
            <!-- 編碼和編譯 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <encoding>utf8</encoding>
                </configuration>
            </plugin>
        </plugins>
        <finalName>ajie-wechat</finalName>
    </build>
</project>

右鍵項目run As -> MavenInstall，從Maven 倉庫下載項目所需的依賴包 .

C、配置spring-mvc.xml 和 applicationContext.xml 和 Jdcb.properties 配置文件：

1、 applicationContext.xml的配置文件:

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:cache="http://www.springframework.org/schema/cache"
    xmlns:jaxws="http://cxf.apache.org/jaxws"
    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-3.1.xsd
                    http://www.springframework.org/schema/tx 
                    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
                    http://www.springframework.org/schema/aop 
                    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
                    http://www.springframework.org/schema/context      
                    http://www.springframework.org/schema/context/spring-context-3.1.xsd
                    http://www.springframework.org/schema/cache 
                    http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
                    http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd 
                    http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd" 
                    default-lazy-init="true">

    <!-- 啓動組件掃描，排除@Controller組件，該組件由SpringMVC配置文件掃描 -->
    <context:component-scan base-package="com.xiaoyu.jpa">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 屬性文件位置 -->
    <context:property-placeholder location="/config/jdcb.properties" />


    <!-- 數據源 -->
    <bean id="dataSource" class="com.jolbox.bonecp.BoneCPDataSource"
        destroy-method="close">
        <!-- 數據庫驅動 -->
        <property name="driverClass" value="${jdbc.driverClassName}" />
        <!-- 相應驅動的jdbcUrl-->
        <property name="jdbcUrl" value="${jdbc.url}" />
        <!-- 數據庫的用戶名 -->
        <property name="username" value="${jdbc.username}" />
        <!-- 數據庫的密碼 -->
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!-- JPA實體管理器工廠 -->
    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter" />
        <!-- 加入定製化包路徑 -->
        <property name="packagesToScan" value="com.xiaoyu.jpa.model" />

        <property name="jpaProperties">
            <props>
                <prop key="hibernate.current_session_context_class">thread</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop><!-- validate/update/create -->
                <prop key="hibernate.show_sql">false</prop>
                <prop key="hibernate.format_sql">false</prop>

                <!-- 建表的命名規則 -->
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>

            </props>
        </property>
    </bean>

    <!-- 設置JPA實現廠商的特定屬性 -->
    <bean id="hibernateJpaVendorAdapter"
        class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="databasePlatform" value="${hibernate.dialect}"/>
    </bean>

    <!-- Jpa 事務配置 -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <!-- Spring Data Jpa配置 -->
    <jpa:repositories base-package="com.xiaoyu.jpa"  transaction-manager-ref="transactionManager" entity-manager-factory-ref="entityManagerFactory"/>

    <!-- 使用annotation定義事務 -->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
</beans>

2、spring-mvc.xml 配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation=" 
                http://www.springframework.org/schema/beans 
                http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
                http://www.springframework.org/schema/context 
                http://www.springframework.org/schema/context/spring-context-3.1.xsd 
                http://www.springframework.org/schema/mvc 
                http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd" >

    <!-- 啓用SpringMVC的註解功能,它會自動註冊HandlerMapping、HandlerAdapter、ExceptionResolver的相關實例 -->
    <mvc:annotation-driven />
    <!-- SpringMVC的掃描範圍 -->
    <context:component-scan base-package="com.xiaoyu.jpa.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>

    <!-- 默認訪問跳轉到登錄頁面，即定義無Controller的path<->view直接映射 
    <mvc:view-controller path="/" view-name="redirect:/login"/>
    -->

    <!-- 靜態文件訪問 -->
    <!-- <mvc:resources mapping="/resources/**" location="/resources/" /> -->

    <!-- 用於返回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>

     <!-- 完成請求和註解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
         <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

    <!-- 配置SpringMVC的視圖解析器 --> 
    <!-- 其viewClass屬性的默認值就是org.springframework.web.servlet.view.JstlView -->  
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> -->
        <property name="prefix" value="/" />
        <property name="suffix" value=".html" />
    </bean>

    <!-- 總錯誤處理-->
<!--     <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">  
        <property name="defaultErrorView">
            <value>/base/error</value>
        </property>
        <property name="defaultStatusCode">
            <value>500</value>
        </property>
        <property name="warnLogCategory">
            <value>org.springframework.web.servlet.handler.SimpleMappingExceptionResolver</value>  
        </property>
    </bean> -->

    <!-- 靜態資源加載 -->
    <mvc:resources location="/css/" mapping="/css/**" />

    <mvc:resources location="/images/" mapping="/images/**" />
    <mvc:resources location="/ATTACHMENT/" mapping="/ATTACHMENT/**" />

</beans>

3、項目的 web.xml 文件:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <display-name>Archetype Created Web Application</display-name>

  <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
    </context-param>

     <!-- 防止發生java.beans.Introspector內存泄露,應將它配置在ContextLoaderListener的前面 -->  
    <!-- 詳細描述見http://blog.csdn.net/jadyer/article/details/11991457 -->  
    <listener>  
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
    </listener>  

     <!-- 實例化Spring容器 -->  
    <!-- 應用啓動時,該監聽器被執行,它會讀取Spring相關配置文件,其默認會到WEB-INF中查找applicationContext.xml -->  
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 配置編碼過濾器 -->
    <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>/*</url-pattern>
    </filter-mapping>

    <!-- 配置spring管理OpenEntityManagerInViewFilter-->
    <!-- OpenEntityManagerInViewFilter會讓session一直到view層調用結束後才關閉
        Spring針對Hibernate的非JPA實現用的是OpenSessionInViewFilter，原理與這個大同小異
     -->
    <filter>
        <filter-name>hibernateFilter</filter-name>
        <filter-class>
            org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter
        </filter-class>
    </filter>
    <filter-mapping>
        <filter-name>hibernateFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 用默認的servlet來處理資源 -->
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.jpg</url-pattern>    
    </servlet-mapping> 
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.png</url-pattern>    
    </servlet-mapping>     
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.gif</url-pattern>    
    </servlet-mapping> 
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.woff</url-pattern>    
    </servlet-mapping> 
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.ttf</url-pattern>    
    </servlet-mapping>          
    <servlet-mapping>  
        <servlet-name>default</servlet-name> 
        <url-pattern>*.map</url-pattern>    
    </servlet-mapping>      
    <servlet-mapping>      
        <servlet-name>default</servlet-name>   
        <url-pattern>*.js</url-pattern>   
    </servlet-mapping>  
    <servlet-mapping>       
        <servlet-name>default</servlet-name>      
        <url-pattern>*.css</url-pattern>     
    </servlet-mapping>  
    <servlet-mapping>       
        <servlet-name>default</servlet-name>      
        <url-pattern>*.html</url-pattern>     
    </servlet-mapping>

    <!-- SpringMVC核心分發器 -->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>/index.html</welcome-file>
    </welcome-file-list>
</web-app>

4、jdcb.properties 配置文件:

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc\:mysql\://localhost\:3306/people?useUnicode\=true&characterEncoding\=UTF-8

jdbc.username=root

jdbc.password=123456

hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect

BoneCP.idleConnectionTestPeriod=60

BoneCP.idleMaxAge=60

BoneCP.maxConnectionsPerPartition=5

BoneCP.minConnectionsPerPartition=1

BoneCP.partitionCount=3

BoneCP.acquireIncrement=2  

BoneCP.statementsCacheSize=0 

BoneCP.releaseHelperThreads=3

D、新建 Person.class 實體類、PersonDao接口、PersonService類、PersonController類:

1、新建Person實體類:

@Entity
@Table(name = "person")
public class Person implements Serializable {

    private static final long serialVersionUID = 7419229779731522702L;

    private int id;
    private String name;
    private int age;
    private int sex;

    public Person(){};

    @Id
    @Column(name="id",nullable=false,length=32,unique=true)
    @GenericGenerator(name="generator",strategy="uuid.hex")
    @GeneratedValue
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }


    @Column(name="name",nullable=false,length=32)
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    @Column(name="age",nullable=false,length=32)
    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }


    @Column(name="sex",nullable=false,length=32)
    public int getSex() {
        return sex;
    }

    public void setSex(int sex) {
        this.sex = sex;
    }

    public Person(int id, String name, int age, int sex) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Person [id=" + id + ", name=" + name + ", age=" + age + ", sex=" + sex + "]";
    }

2、新建PersonDao接口:

public interface PersonDao extends JpaRepository<Person,Integer> {

    @Query(value="From Person" )
    List<Person> findAllPersons();

    @Query(value="From Person where name = ?")
    Person findPersonByName(String name);

    //@Query(value="select * from person",nativeQuery = true)
    //List<Person> findAllPersons();
}

PersonDao接口主要實現 springdataJpa 的 JpaRepository

@Service
@Transactional
public class PersonService {


    @Autowired
    private PersonDao persondao;


    public String add(Person person){
        persondao.save(person);
        return "添加成功";
    }

    public String updatePerson(Person p){
        persondao.save(p);
        return "添加成功";
    }

    public Person findPersonById(int id ){
        return persondao.findOne(id);
    }

    public List<Person> findAllPersons(){
        return persondao.findAllPersons();
    }

    public Person findPersonByName(String name){
        return persondao.findPersonByName(name);
    }

4、PersonController類:

@Controller
@RequestMapping(value="/controller")
public class PersonController {

    @Autowired
    private PersonService personServcie; 

    @ResponseBody
    @RequestMapping(value="/savePerson")
    public String savePerson(){
        Person p = new Person();
        p.setId(3);
        p.setName("王五");
        p.setSex(20);
        String result = personServcie.add(p);
        return result;
    }

    @ResponseBody
    @RequestMapping(value="/findPerson")
    public Person findPerson(int id){
        System.out.println("已經進來了這裏");
        Person p = personServcie.findPersonById(id);
        return p;
    }

    @ResponseBody
    @RequestMapping(value="/updatePerson")
    public Person updatePerson(int id){
        System.out.println("已經進來了這裏");
        Person p = new Person();
        p = personServcie.findPersonById(id);
        p.setAge(20);
        p.setSex(0);
        personServcie.add(p);
        return p;
    }

    @ResponseBody
    @RequestMapping(value="/findAllPersons")
    public List<Person> findAllPersons(){
        return personServcie.findAllPersons();
    }


    @ResponseBody
    @RequestMapping(value="/findByName")
    public Person findByName(String name){
        return personServcie.findPersonByName("張三");
    }

啓動項目然後訪問 :
http://localhost:8080/quick4j/controller/findPerson?id=1