Spring Data JPA 一：环境搭建

搭建开发环境是最麻烦的事情，各种冲突各种异常，记一下搭建过程，仅供大家参考：

用的gradle搭建的项目,先亮一下项目的大概目录：

注意一定要是这个

web工程用spring/src/main/webapp/WEB-INF/classes

表结构：

用到所有的包及依赖包如下，（如果用最新的spring包的话依赖到了springboot在 org.springframework.beans.factory.config.PropertyPlaceholderConfigurer 会有冲突）

新建一个maven的maven-archetype-webapp工程。

默认就只有一个src/main/resources这个sourceFolder

怎么添加新的呢？我发现直接添加src/main/java会报已经存在这个sourceFolder，我们可以先建一个如src/main/xx这个sourceFolder再用eclipse快捷键F2把xx改成java

build.gradle放在根目录下面，并在里面把相关jar包放进去

import org.gradle.plugins.ide.eclipse.model.Facet

apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'eclipse'
apply plugin: 'eclipse-wtp'

sourceCompatibility = 1.8   // 设置 JDK 版本
webAppDirName = 'WebContent'    // 设置 WebApp 根目录
sourceSets.main.java.srcDir 'src/main/java'   // 设置 Java 源码所在目录

// 设置 maven 库地址
repositories {
    mavenCentral() // 中央库
}

// 设置依赖
dependencies {
    providedCompile 'javax.servlet:servlet-api:2.5' // 编译期
    providedRuntime 'javax.servlet:jstl:1.2'    // 运行时
    compile 'org.springframework:spring-context:4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-core', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-beans', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-context', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-context-support', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-web', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-webmvc', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-aop', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-tx', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-jdbc', version: '4.3.8.RELEASE'
    compile group: 'org.springframework', name: 'spring-test', version: '4.3.8.RELEASE'
    compile group: 'org.springframework.hateoas', name: 'spring-hateoas', version: '0.23.0.RELEASE'
	compile group: 'org.springframework.data', name: 'spring-data-jpa', version: '1.11.3.RELEASE'
	compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.6'
	compile group: 'org.hibernate', name: 'hibernate-entitymanager', version: '4.3.11.Final'
	/*compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2.10.Final'*/
	compile group: 'org.hibernate.javax.persistence', name: 'hibernate-jpa-2.1-api', version: '1.0.0.Final'
	compile group: 'com.alibaba', name: 'fastjson', version: '1.2.32'
	compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
	compile group: 'log4j', name: 'log4j', version: '1.2.17'
	/*compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-rest', version: '1.5.3.RELEASE'*/
	compile group: 'com.alibaba', name: 'druid', version: '1.0.31'

}

// 设置 Project Facets
eclipse {
    wtp {
        facet {
            facet name: 'jst.web', type: Facet.FacetType.fixed
            facet name: 'wst.jsdt.web', type: Facet.FacetType.fixed
            facet name: 'jst.java', type: Facet.FacetType.fixed
            facet name: 'jst.web', version: '3.1'
            facet name: 'jst.java', version: '1.8'
            facet name: 'wst.jsdt.web', version: '1.0'
        }
    }
}

用cmd进入到项目所在目录执行gradle eclipse即可下载相关的包及依赖包（d:  进入D盘； cd xx 进入xx目录； dir 显示目录及文件）

要记得把junit包加进来因为后面要测试。

好，把各个代码放进来:

UserController

package auth.controller;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.alibaba.fastjson.JSONObject;

import auth.dao.UserRepository;
import auth.model.User;
@Service
public class UserController {
	private Logger log=LoggerFactory.getLogger(this.getClass());
	@Autowired
	private UserRepository userDao;
	public String findUsers(){
		log.info("------查询数据------");
		List users=userDao.findAll();
		return JSONObject.toJSONString(users);
	}

}

UserRepository

package auth.dao;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;

import auth.model.User;
public interface UserRepository extends JpaRepository<User, Integer>{
	public List findAll();

}

User

package auth.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="user")
public class User {
	private int id;
	private String name;
	private int age;
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="id")
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	@Column(name="name")
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Column(name="age")
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

UserTest

package auth.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import auth.controller.UserController;

public class userTest {
	public static void test1(){
		@SuppressWarnings("resource")
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "classpath:applicationContext.xml" });
		context.start();
		UserController dao = (UserController) context.getBean("userController");
		String xx=dao.findUsers();
		System.out.println(xx);
	}
	public static void main(String[] args) {
		System.out.println("hello");
		test1();
	}

}

junitTest

junitTest Base

package spring;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
public class Base {

}

junitTest Tests

package spring;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import auth.controller.UserController;

public class Tests extends Base{
	@Autowired
	private UserController dao;
	@Test
	public void getUsers(){
		String users=dao.findUsers();
		System.out.println(users);
	}

}

配置文件

applicationContext.xml:

<?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:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	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/data/jpa
	http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
	<import resource="classpath*:dispatcher-servlet.xml"/>
	<context:component-scan base-package="auth.*" />
	<jpa:repositories base-package="auth" />
	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:config.properties</value>
			</list>
		</property>
	</bean>
	<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
		init-method="init" destroy-method="close">
		<property name="url" value="${jdbc_url}" />
		<property name="username" value="${jdbc_username}" />
		<property name="password" value="${jdbc_password}" />
		<!-- 初始化连接大小 -->
		<property name="initialSize" value="0" />
		<!-- 连接池最大使用连接数量 -->
		<property name="maxActive" value="20" />
		<!-- 连接池最小空闲 -->
		<property name="minIdle" value="0" />
		<!-- 获取连接最大等待时间 -->
		<property name="maxWait" value="60000" />
		<property name="validationQuery" value="${validationQuery}" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		<property name="testWhileIdle" value="true" />
		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
		<property name="timeBetweenEvictionRunsMillis" value="60000" />
		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
		<property name="minEvictableIdleTimeMillis" value="25200000" />

		<!-- 打开removeAbandoned功能 -->
		<property name="removeAbandoned" value="true" />
		<!-- 1800秒，也就是30分钟 -->
		<property name="removeAbandonedTimeout" value="1800" />
		<!-- 关闭abanded连接时输出错误日志 -->
		<property name="logAbandoned" value="true" />

		<!-- 监控数据库 -->
		<!-- <property name="filters" value="mergeStat" /> -->
		<property name="filters" value="stat" />
	</bean>
	<bean class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory" />
	</bean>

	<bean id="entityManagerFactory"
		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="packagesToScan" value="auth" />
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
			</bean>
		</property>
		<property name="jpaProperties">
			<props>
				<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
				<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
			</props>
		</property>
	</bean>

	<!-- JDBC模版 -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource">
			<ref bean="dataSource" />
		</property>
	</bean>

	<!-- 配置 JPA Transaction -->
	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="jpaDialect">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"></bean>
		</property>
		<property name="entityManagerFactory" ref="entityManagerFactory" />
	</bean>

	<!-- 配置 Annotation 驱动，定义事务-->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
</beans>

config.properties:

hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
#old
#driverClassName=com.mysql.jdbc.Driver
#new
driverClassName=com.mysql.cj.jdbc.Driver
validationQuery=SELECT 1
#old
#jdbc_url=jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
#new
jdbc_url=jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbc_username=root
jdbc_password=123456

hibernate.hbm2ddl.auto=none
hibernate.show_sql=false
hibernate.format_sql=true
hibernate.use_sql_comments=true

dispatcher-servlet.xml:

<?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"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd"
    default-lazy-init="true">
    <!-- 默认扫描的包路径 -->
     <context:component-scan base-package="auth.*" />
     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix">
            <value>/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
</beans>

　　

log4j.properties:

log4j.rootLogger=debug, stdout
log4j.category.org.apache.zookeeper=error
log4j.category.org.springframework=error
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c:%L] - %m%n

　　

web.xml(java项目可以不配置):

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
      http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath*:applicationContext.xml
		</param-value>
	</context-param>

	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<servlet>
		<servlet-name>mvcDispatcher</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath*:dispatcher-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>mvcDispatcher</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<filter>
		<filter-name>encodingFilter</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>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<welcome-file-list>
		<welcome-file>login.jsp</welcome-file>
	</welcome-file-list>
</web-app>

　运行下junit的自定义Tests类和或者我们自己写的Test类得到的结果如下：

[{"age":18,"id":1,"name":"ws"},{"age":20,"id":2,"name":"lm"},{"age":23,"id":3,"name":"lt"}]