常用框架(二) : spring+springMvc+mybatis+maven+redis

在上一篇常用框架(一)中已经搭建好了基本框架，这里主要是集成 redis 缓存框架到项目中，作为补充。

需要查看前篇的请点这里跳转：http://blog.csdn.net/mynoteblog/article/details/54922775

先来看下项目结构：

一，在pom.xml 中追加redis依赖包，由于改动比较多，这里还是直接贴上全部内容，以免遗漏：

<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.maven.web</groupId><artifactId>com.maven.web</artifactId><packaging>war</packaging><version>0.0.1-SNAPSHOT</version><name>com.maven.web Maven Webapp</name><properties><spring.version>4.3.0.RELEASE</spring.version><jackson.version>2.6.5</jackson.version><fastjson.version>1.2.23</fastjson.version><mybatis.version>3.3.0</mybatis.version><mybatis-spring.version>1.2.3</mybatis-spring.version><mysql.connector.version>5.1.29</mysql.connector.version><jedis.version>2.7.3</jedis.version>    <spring.data.redis.version>1.7.1.RELEASE</spring.data.redis.version></properties><repositories><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- @Resource注解包 --><dependency><groupId>javax.annotation</groupId><artifactId>javax.annotation-api</artifactId><version>1.2</version></dependency><!-- Spring --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-expression</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</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-orm</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>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><!-- 数据库连接池 --><dependency><groupId>commons-dbcp</groupId><artifactId>commons-dbcp</artifactId><version>1.4</version></dependency><!-- mybatis start --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${mybatis.version}</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>${mybatis-spring.version}</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.2</version></dependency><!-- mysql --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.connector.version}</version></dependency><!-- StringUtils --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.4</version></dependency><!-- jackson --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>${jackson.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>${jackson.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>${jackson.version}</version></dependency><!-- fastjson --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency><!-- fastjson --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency> <!-- redis start -->    <dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>${jedis.version}</version> </dependency> <dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-redis</artifactId><version>${spring.data.redis.version}</version>     </dependency>     <!-- redis end -->     </dependencies><build><finalName>com.maven.web</finalName></build></project>

二，添加 Spring-redis.xml  配置文件，内容如下：

<?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"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd"><!-- blockWhenExhausted: 从Pool中获取Jedis对象，Pool资源耗尽后阻塞maxWaitMillis参数指定时间 --><!-- maxWaitMillis: 从Pool中获取Jedis对象超时时间 --><bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"      p:minIdle="2"      p:maxIdle="5"      p:maxTotal="8"      p:maxWaitMillis="2000"      p:testOnBorrow="false"      p:testOnReturn="false"      p:testWhileIdle="true"      p:blockWhenExhausted="true" /><bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">    <property name="usePool" value="true" />    <property name="hostName" value="192.168.230.130" />    <property name="port" value="6379" />    <property name="password" value="" />    <property name="timeout" value="2000" /><constructor-arg name="poolConfig" ref="jedisPoolConfig" /></bean><bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">     <property name="connectionFactory" ref="jedisConnectionFactory" /></bean></beans>

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这里需要说明一下：

hostName：填写安装有redis的服务器地址，我这里是安装到本地虚拟机的，如何安装请参看博客：http://www.cnblogs.com/yun965861480/p/6273451.html

port：默认端口是6379

password：自己设置，我这里为空

下面是我启动虚拟机中redis服务的截图，在启动我们项目之前，需要先启动redis：

三，Spring-config.xml 原来的配置中引入redis 的配置文件，如下：

<import resource="classpath:Spring-redis.xml" />

四，redis的使用，我这里直接用的工具类，代码分享如下：

(1) RedisService

package com.maven.web.redis;import java.util.Collection;import java.util.concurrent.TimeUnit;import java.util.function.Supplier;/** * redis缓存接口。 * * 缓存时间单位默认分钟， * 默认timeout值为5， * 没有timeout和timeunit的方法默认不设置有效时间，永久有效。 */public interface RedisService {int EXPIRE_TIME_1 = 1;int EXPIRE_TIME_2 = 2;int EXPIRE_TIME_5 = 5;int EXPIRE_TIME_7 = 7;int EXPIRE_TIME_15 = 15;int EXPIRE_TIME_30 = 30;<T> void put(String key, T obj);<T> void put(String key, T obj, int timeout);<T> void put(String key, T obj, int timeout, TimeUnit unit);<T> T get(String key, Class<T> cls);<E, T extends Collection<E>> T get(String key, Class<E> cls, Class<T> collectionClass);<T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier);<T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout);<T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout, TimeUnit unit);<T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout, TimeUnit unit, boolean refresh);<E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier);<E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout);<E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout, TimeUnit unit);<E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout, TimeUnit unit, boolean refresh);boolean exists(String key);void delete(String key);boolean expire(String key, long timeout, TimeUnit timeUnit);boolean expire(String key, long timeout);void put(String key, String value);void put(String key, String value, int timeout);void put(String key, String value, int timeout, TimeUnit unit);String get(String key);}

(2) RedisServiceImpl

package com.maven.web.redis;import java.util.Collection;import java.util.concurrent.TimeUnit;import java.util.function.Supplier;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.stereotype.Component;import com.maven.web.util.JsonUtils;@Component("redisService")public class RedisServiceImpl implements RedisService {private StringRedisTemplate redisTemplate;@Autowiredpublic void setRedisTemplate(StringRedisTemplate redisTemplate) {this.redisTemplate = redisTemplate;}public <T> void put(String key, T obj) {redisTemplate.opsForValue().set(key, JsonUtils.toJson(obj));}public <T> void put(String key, T obj, int timeout) {put(key, obj, timeout, TimeUnit.MINUTES);}public <T> void put(String key, T obj, int timeout, TimeUnit unit) {redisTemplate.opsForValue().set(key, JsonUtils.toJson(obj), timeout, unit);}public <T> T get(String key, Class<T> cls) {return JsonUtils.fromJson(redisTemplate.opsForValue().get(key), cls);}public <E, T extends Collection<E>> T get(String key, Class<E> cls, Class<T> collectionClass) {return JsonUtils.fromJson(redisTemplate.opsForValue().get(key), cls, collectionClass);}public <T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier) {T t = get(key, cls);if (t == null) {t = supplier.get();if (t != null) {put(key, t);}}return t;}public <T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout) {T t = get(key, cls);if (t == null) {t = supplier.get();if (t != null) {put(key, t, timeout);}}return t;}public <T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout, TimeUnit unit) {T t = get(key, cls);if (t == null) {t = supplier.get();if (t != null) {put(key, t, timeout, unit);}}return t;}public <T> T putIfAbsent(String key, Class<T> cls, Supplier<T> supplier, int timeout, TimeUnit unit, boolean refresh) {T t = get(key, cls);if (t == null) {t = supplier.get();if (t != null) {put(key, t, timeout, unit);}} else {if (refresh) {expire(key, timeout, unit);}}return t;}public <E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier) {T t = get(key, cls, collectionCls);if (t == null || t.isEmpty()) {t = supplier.get();if (t != null && t.size() > 0) {put(key, t);}}return t;}public <E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout) {return putIfAbsent(key, cls, collectionCls, supplier, timeout, TimeUnit.SECONDS);}public <E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout, TimeUnit unit) {return putIfAbsent(key, cls, collectionCls, supplier, timeout, unit, false);}public <E, T extends Collection<E>> T putIfAbsent(String key, Class<E> cls, Class<T> collectionCls, Supplier<T> supplier, int timeout, TimeUnit unit, boolean refresh) {T t = get(key, cls, collectionCls);if (t == null || t.isEmpty()) {t = supplier.get();if (t != null && t.size() > 0) {put(key, t, timeout, unit);}} else {if (refresh) {expire(key, timeout, unit);}}return t;}public boolean exists(String key) {return redisTemplate.hasKey(key);}public void delete(String key) {redisTemplate.delete(key);}public boolean expire(String key, long timeout, TimeUnit timeUnit) {return redisTemplate.expire(key, timeout, timeUnit);}public boolean expire(String key, long timeout) {return expire(key, timeout, TimeUnit.MINUTES);}public void put(String key, String value) {redisTemplate.opsForValue().set(key, value);}public void put(String key, String value, int timeout) {put(key, value, timeout, TimeUnit.MINUTES);}public void put(String key, String value, int timeout, TimeUnit unit) {redisTemplate.opsForValue().set(key, value, timeout, unit);}public String get(String key) {return redisTemplate.opsForValue().get(key);}}

(3) JsonUtils

package com.maven.web.util;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Collection;import org.apache.commons.lang3.StringUtils;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.DeserializationFeature;import com.fasterxml.jackson.databind.JavaType;import com.fasterxml.jackson.databind.ObjectMapper;public final class JsonUtils {//public static final Logger LOGGER = LoggerFactory.getLogger(JsonUtils.class);private JsonUtils() {}private static ObjectMapper objectMapper;static {objectMapper = new JsonObjectMapper();objectMapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);objectMapper.setDateFormat(new SimpleDateFormat("yyyyMMddHHmmss"));}public static <T> String toJson(T obj) {try {return objectMapper.writeValueAsString(obj);} catch (JsonProcessingException e) {e.printStackTrace();//LOGGER.error("class: {} serialize to JSON error: {}", ToStringBuilder.reflectionToString(obj), e);}return null;}public static <T> T fromJson(String json, Class<T> cls) {try {if (StringUtils.isBlank(json)) {return null;}return objectMapper.readValue(json, cls);} catch (IOException e) {e.printStackTrace();//LOGGER.error("deserialize failed! JSON string: {}, class: {}, reason: {}", json, cls, e);}return null;}public static <E, T extends Collection<E>> T fromJson(String json, Class<E> cls, Class<T> collectionCls) {if (StringUtils.isBlank(json)) {return null;}JavaType javaType = objectMapper.getTypeFactory().constructParametricType(collectionCls, cls);try {return objectMapper.readValue(json, javaType);} catch (IOException e) {e.printStackTrace();/*LOGGER.error("deserialize failed! JSON string: {}, Object class:{}, Collection class: {}, reason: {}",json, cls, collectionCls, e);*/}return null;}}

(4) JsonObjectMapper

package com.maven.web.util;import java.io.IOException;import com.fasterxml.jackson.core.JsonGenerator;import com.fasterxml.jackson.core.JsonParser;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.JsonSerializer;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.SerializerProvider;public class JsonObjectMapper extends ObjectMapper {private static final long serialVersionUID = 4769299031472855116L;public JsonObjectMapper() {// 允许单引号this.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);// 字段和值都加引号this.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);// 数字也加引号/*this.configure(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS, true);this.configure(JsonGenerator.Feature.QUOTE_NON_NUMERIC_NUMBERS, true);*/// 空值处理为空串this.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {@Overridepublic void serialize(Object value,JsonGenerator jg,SerializerProvider sp) throws IOException, JsonProcessingException {jg.writeString("");}});}}

五，准备工作做好了，接下来是测试

(1) 新增RedisController，代码如下：

package com.maven.web.controller;import javax.annotation.Resource;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import com.maven.web.entity.UserInfo;import com.maven.web.service.impl.UserService;@Controller@RequestMapping("/redis")public class RedisController {@Resourceprivate UserService userService;@ResponseBody@RequestMapping(value="/userInfo",method=RequestMethod.GET)public String getUserInfo(@RequestParam Long uid){UserInfo userInfo = userService.getUserInfo(uid);if(userInfo!=null){return "您要获取的用户名称是："+userInfo.getUserName();}return "获取用户信息失败";}}

(2) UserService 中添加方法，从缓存中获取用户信息，代码片段如下：

/** 从缓存中获取 */UserInfo getUserInfo(Long uid);

(3) UserServiceImpl 实现，代码片段如下：

public UserInfo getUserInfo(Long uid) {String json = redisService.get(USER_INFO+uid);if(json==null){UserInfo userInfo = select(uid);if(userInfo!=null){redisService.put(USER_INFO+uid, userInfo, 1, TimeUnit.HOURS);}return userInfo;}return JsonUtils.fromJson(json, UserInfo.class);}

六，启动tomcat，测试，我这里用的是google应用，postman

开启debug模式进入后台可以看到，第一次是从数据库查询数据，第二次就是从缓存取数据了：

再看返回结果：

**********************************************************************************************

测试成功，到此集成redis框架就完成了，需要参考项目源码的请点这里：http://pan.baidu.com/s/1kVPrPmZ