快取第四篇:在maven專案中使用redis例項
本節利用之前ssm+ehcache搭建好的ssm框架進行改造,其中的ehcache部分已經棄掉,防止ehcache快取的存在對這裡的redis快取的判斷。又整合了redis內容和日誌內容,利用控制檯日誌輸出看快取有沒有起作用。注意點比較多,我準備了差不多幾天時間把這個環境和專案簡單搭建起來,多次的修改和報錯後終於搞定了。其實快取的整合不在spring部分,而在mybatis部分。整合也是整合redis+mybatis或者ehcache+mybatis。先意識到這點,下面就開始吧~
環境:jdk1.7+maven3.3.9+redis3.0.5+mysql資料庫
1.專案結構
其中src/main/java/com/zhanglf包下的各包及其包下的java類如下
src/main/resources/META-INF/app_config/各包及其包下的配置檔案如下
這裡用到的表–student結構如下:
2.引入ssm+redis+log4依賴pom.xml
<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.zhanglf</groupId>
<artifactId>SpringRedisCacheProject</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>RedisProject Maven Webapp</name >
<url>http://maven.apache.org</url>
<properties>
<!--spring版本號 -->
<spring.version>4.0.2.RELEASE</spring.version>
<!--mybatis版本號 -->
<mybatis.version>3.2.6</mybatis.version>
<!--log4j日誌檔案管理包版本 -->
<slf4j.version>1.7.21</slf4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!-- 新增 Spring依賴 -->
<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-oxm</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>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<!--spring核心包 -->
<!--spring單元測試依賴 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<!--mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--mybatis核心包 -->
<!--mybatis-spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<!--mybatis-spring包 -->
<!--匯入資料庫連線jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<!--匯入資料庫連線jar包 -->
<!-- 匯入jbcp的jar,用來在application.xml中配置資料庫, 如jndi,是主流資料庫連線池之一 -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!-- 匯入jbcp的jar,用來在application.xml中配置資料庫, 如jndi,是主流資料庫連線池之一 -->
<!-- JSTL標籤類 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- JSTL標籤類 -->
<!-- 日誌依賴 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.21</version>
<scope>compile</scope>
</dependency>
<!-- 日誌依賴 -->
<!-- 引入redis依賴 -->
<dependency>
<groupId>org.mybatis.caches</groupId>
<artifactId>mybatis-redis</artifactId>
<version>1.0.0-beta2</version>
</dependency>
<!-- 引入redis依賴 -->
<!-- 序列化:將物件轉換為JSON字串 String strJson=JSON.toJSONString(實體物件); 反序列化: UserInfo
userInfo=JSON.parseObject(json,UserInfo.class); -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.17</version>
</dependency>
<!-- 資料庫連線池druid、 用於資料庫欄位加、解密 -->
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.26</version>
</dependency>
<!-- 映入JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
</dependencies>
<build>
<finalName>SpringRedisCacheProject</finalName>
<!-- Compiler外掛,指定jdk版本 -->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
3.src/main/resources資源目錄下個檔案的配置
3.1 日誌配置檔案 log4j.properties.這裡用的jar包是log4j的,log4j預設的配置檔案目錄是resources根目錄下,即和META-INF同級,檔名為log4j.properties。這樣在java工程中用:
Logger logger=LoggerFactory.getLogger(ConfigUtils.class);
logger.info(“日誌資訊”)
就會有日誌輸出了。我們這裡配置的日誌輸出級別為輸出到控制檯。
#定義LOG輸出級別
log4j.rootLogger=Debug,Console
#定義日誌輸出的目的地為控制檯
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#定義靈活地指定日誌輸出格式,下面一行是指定具體的格式
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c]-%m%n
#檔案大小到達指定尺寸的時候產生一個新的檔案
log4j.appender.File=org.apache.log4j.RollingFileAppender
#指定輸出檔案的目錄
log4j.appender.File.File=logs/ssm.log
#指定輸出檔案的大小
log4j.appender.File.MaxFileSize=10MB
#輸出日誌,如果換成debug表示輸出的Debug以上級別的日誌
log4j.appender.File.Threshold=All
log4j.appender.File.layout=org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern=[%p][%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n
3.2 mybatis包下的spring-mybatis.xml.作用是指定資料來源,開啟掃描註解和開啟快取和事務。
<?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:p="http://www.springframework.org/schema/p"
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-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-4.0.xsd">
<!-- 自動掃描 -->
<context:component-scan base-package="com.zhanglf" />
<!-- 引入資料來源的配置檔案 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:/META-INF/app_config/property/jdbc.properties" />
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化連線大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 連線池最大數量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 連線池最大空閒 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 連線池最小空閒 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 獲取連線最大等待時間 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>
<!-- spring和MyBatis完美整合,不需要mybatis的配置對映檔案 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自動掃描mapping.xml檔案 -->
<property name="mapperLocations" value="classpath:com/zhanglf/mapper/*.xml"></property>
<!--開啟redis快取 -->
<property name="configurationProperties">
<props>
<!--全域性對映器啟用快取-->
<prop key ="cacheEnabled">true</prop>
<!--查詢時,關閉關連物件即時載入以提高效能-->
<prop key="lazyLoadingEnabled">false</prop>
<!-- 設定關聯物件載入的形態,此處為按需要載入欄位(載入欄位由sql決定),不會載入關聯表的所有欄位,以提高效能-->
<prop key="aggressiveLazyLoading">true</prop>
</props>
</property>
</bean>
<!-- DAO介面所在包名,Spring會自動查詢其下的類 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.zhanglf.dao" />
</bean>
<!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
3.3 property資料夾下的jdbc.properties和redis.properties.分別是資料來源連線配置和redis服務端連線配置
3.3.1 : jdbc.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ehcachedatabase
username=root
password=
#定義初始化連線數
initialSize=0
#定義最大連線數
maxActive=20
#定義最大空閒
maxIdle=20
#定義最小空閒
minIdle=1
#定義最長等待時間
maxWait=60000
3.3.2 redis.properties。這裡需要說明的是這裡的配置是redis伺服器的配置,正常我們沒有對伺服器進行過設定,是沒有密碼的。說以這裡密碼對應的值為空,ip和埠值為伺服器預設設定,其能讓我們找到redis服務並連線上。開關是程式用的,是啟用redis的標誌。jedis.pool….是對連線redis伺服器的jedispool的設定。通過設定pool的連線時間,最大連線數等來起到控制redis在程式中的作用
redis.ip=127.0.0.1
redis.port=6379
redis.key=SOA
redis.password=
#是否啟用redis?true啟用,false不啟用。
redis.switch=true
jedis.pool.maxActive=3000
jedis.pool.maxIdle=1000
jedis.pool.maxWait=1500
jedis.pool.testOnBorrow=true
jedis.pool.testOnReturn=true
jedis.pool.timeout=5000
3.4 web資料夾下的springmvc.xml。主要是controller層與前臺頁面資料互動的一些配置。
<?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:p="http://www.springframework.org/schema/p"
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-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-4.0.xsd">
<!-- 自動掃描該包,使SpringMVC認為包下用了@controller註解的類是控制器 -->
<context:component-scan base-package="com.zhanglf.controller" />
<!-- mvc註解驅動 -->
<mvc:annotation-driven />
<!-- 在對所有的攔截改為不包括easyui的攔截,這樣easyui才能引入成功。 -->
<mvc:resources location="/static/js/easyui/" mapping="/static/js/easyui/**" />
<!--避免IE執行AJAX時,返回JSON出現下載檔案 -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<!-- 啟動SpringMVC的註解功能,完成請求和註解POJO的對映 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON轉換器 -->
</list>
</property>
</bean>
<!-- 定義跳轉的檔案的前後綴 ,檢視模式配置 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 這裡的配置我的理解是自動給後面action的方法return的字串加上字首和字尾,變成一個 可用的url地址 -->
<property name="prefix" value="/view/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
3.5 這裡把web.xml也歸結到這裡吧,反正也是一個配置,不過這個是程式的主入口。
<?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"
xmlns:web="http://java.sun.com/xml/ns/javaee"
xsi:schemaLacation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:META-INF/app_config/mybatis/spring-mybatis.xml</param-value>
</context-param>
<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>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--防止spring記憶體溢位 -->
<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>
<!-- Spring 監聽器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<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:META-INF/app_config/web/springmvc.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>
</web-app>
4.src/main/java目錄下的個檔案程式碼
4.1 bo層的StudentBo,dao層的StudentDao,mapper層的StudentMapper是用generator生成器自動生成的。這裡如果不清楚如何生成,可以看我前面說的:Mybatis-generator生成器的使用步驟,然後把生成的檔案改成我現在這個名字就行。生成的名字有些不符合命名習慣,改動是要特別注意mapper檔案中的關聯部分是否會受到影響— Dao層介面直接對應mapper.xml Dao層路徑+介面名=mapper檔案的namespace.
4.1.1 bo/StudentBo.java
package com.zhanglf.bo;
import java.io.Serializable;
public class StudentBo implements Serializable {
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private Integer age;
private String address;
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 == null ? null : name.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address == null ? null : address.trim();
}
}
4.1.2 dao/StudentDao.java
package com.zhanglf.dao;
import java.util.List;
import com.zhanglf.bo.StudentBo;
/**
* 注意:Dao層介面直接對應mapper.xml。
* Dao層路徑+介面名=mapper檔案的namespace
* @author Administrator
*
*/
public interface StudentDao {
int deleteByPrimaryKey(Integer id);
int insert(StudentBo record);
int insertSelective(StudentBo record);
StudentBo selectByPrimaryKey(Integer id);
List<StudentBo> selectAllStudent();
int updateByPrimaryKeySelective(StudentBo record);
int updateByPrimaryKey(StudentBo record);
}
4.1.3 mapper/StudentMapper.xml,這裡注意一個重點配置。mapper檔案中引入了自定義快取類:RedisCache。則此mapper中的所有查詢語句和結果會被快取起來。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zhanglf.dao.StudentDao">
<resultMap id="BaseResultMap" type="com.zhanglf.bo.StudentBo">
<id column="id" property="id" jdbcType="INTEGER" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
<result column="address" property="address" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List">
id, name, age, address
</sql>
<!-- 引入自定義快取類實現cache介面 -->
<cache type="com.zhanglf.cache.RedisCache"/>
<select id="selectAllStudent" resultMap="BaseResultMap" >
select
*
from student
</select>
<select id="selectByPrimaryKey" resultMap="BaseResultMap"
parameterType="java.lang.Integer">
select
<include refid="Base_Column_List" />
from student
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from student
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.zhanglf.bo.StudentBo">
insert into student (id, name, age,
address)
values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER},
#{address,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.zhanglf.bo.StudentBo">
insert into student
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="id != null">
id,
</if>
<if test="name != null">
name,
</if>
<if test=