Spring Boot环境搭建
Spring Boot 文档
https://docs.spring.io/spring-boot/docs/1.5.2.RELEASE/reference/htmlsingle/
配置模板Thymeleaf配置
#thymeleaf start
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
#开发时关闭缓存,不然没法看到实时页面
spring.thymeleaf.cache=false
#thymeleaf end
mybatis
依赖
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
配置
#mybatis
#数据库中对应的表的实体类
mybatis.type-aliases-package=com/example/demo/domain
#下划线转换与实体类
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.configuration.default-fetch-size=100
mybatis.configuration.default-statement-timeout=3000
druid配置
#druid
spring.datasource.url=jdbc:mysql://localhost:3306/miaosha?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#连接池的配置信息
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
Spring-Boot集成 redis
添加 Jedis依赖
添加 Fastjson依赖(将java对象序列化写到redis中)
序列化后是 json格式的
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.38</version>
</dependency>
配置
#redis
redis.host=localhost
redis.port=6379
redis.password=123456
redis.timeout=3
redis.poolMaxTotal=10
redis.poolMaxidle=10
redis.poolMaxWait=3
创建 redis的配置类使用了 @ConfigurationProperties注解 要加入下面的依赖
https://docs.spring.io/spring-boot/docs/1.5.12.RELEASE/reference/html/configuration-metadata.html#configuration-metadata-annotation-processor
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
redis配置类
package com.example.demo.redis;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
/**
* Created by Administrator on 2018/5/3.
*/
@Component
@ConfigurationProperties(prefix="redis")
public class RedisConfig {
private String host;
private int port;
private int timeout;
private String password;
private int poolMaxTotal;
private int poolMaxidle;
private int poolMaxWait;
all get and set
写一个操作redis的逻辑类
里面有 get和set
通过redis配置类,通过redis池创建返回一个jedis,再去操作。
将对象序列化传入 redis中。
package com.example.demo.service;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import com.example.demo.redis.RedisConfig;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
@Service
public class RedisService {
@Autowired
RedisConfig redisConfig;
@Autowired
JedisPool jedisPool;
public <T> T get(String key,Class<T> clazz){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String str = jedis.get(key);
//把str转为Bean输出
T t = stringToBean(str,clazz);
return t;
}finally {
returnToPool(jedis);
}
}
public <T> boolean set(String key, T value){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String str = beanToString(value);
if(str==null|| str.length()<=0){
return false;
}
jedis.set(key,str);
}finally {
returnToPool(jedis);
}
return false;
}
//通过fastjson把字符串转为bean
private <T> T stringToBean(String str,Class<T> clazz){
if (str == null ||str.length()<=0||clazz==null){
return null;
}
if (clazz == int.class||clazz ==Integer.class){
return (T)Integer.valueOf(str);
}else if (clazz == String.class){
return (T) str;
}else if (clazz == long.class||clazz==Long.class){
return (T)Long.valueOf(str);
}else{
return JSON.toJavaObject(JSON.parseObject(str),clazz);
}
}
//bean转为字符串
private <T>String beanToString( T value){
//判断这个value是什么类型,然后针对的进行转为字符串
//可以为int,字符串,对象等等
if(value ==null){
return null;
}
Class<?> clazz = value.getClass();
if (clazz == int.class||clazz ==Integer.class){
return ""+value;
}else if (clazz == String.class){
return (String)value;
}else if (clazz == long.class||clazz==Long.class){
return ""+value;
}else{
return JSON.toJSONString(value);
}
//关闭连接
private void returnToPool(Jedis jedis){
if (jedis!=null) {
jedis.close();
}
}
@Bean
public JedisPool JedispPoolFactory(){
JedisPoolConfig poolConfig = new JedisPoolConfig();
poolConfig.setMaxTotal(redisConfig.getPoolMaxTotal());
poolConfig.setMaxIdle(redisConfig.getPoolMaxidle());
poolConfig.setMaxWaitMillis(redisConfig.getPoolMaxWait()*1000);
JedisPool jp = new JedisPool(poolConfig,redisConfig.getHost(),redisConfig.getPort(),
redisConfig.getTimeout()*1000,redisConfig.getPassword(),0);
return jp;
}
}
之前在 redis中进行了设置 set key
get获取
这么写对key的操作太有问题了。
于是对这个key加个前缀。
前缀不同加上 key就是真正的key
通用缓存 Key封装
接口<–抽象类<–实现类
什么意思呢~
先定义个接口 定义两个方法,一个获取前缀,一个获取过期时间
public interface KeyPrefix {
//过期时间
public int expireSeconds();
//前缀
public String getPrefix();
}
定义个抽象类
定义两个属性,一个是过期时间,一个是前缀
如果没有传入过期时间就是永不过期的创建这个构造函数
然后这个前缀的定义。如何定义
类名+加上前缀就是前缀了。
public abstract class BasePrefix implements KeyPrefix{
private int expireSeconds;
private String Prefix;
//默认创建永不过期的
public BasePrefix(String prefix) {
this.expireSeconds = 0;
Prefix = prefix;
}
public BasePrefix(int expireSeconds, String prefix) {
this.expireSeconds = expireSeconds;
Prefix = prefix;
}
public int expireSeconds() {
return expireSeconds;
}
public String getPrefix() {
//那么不同模块如何保证前缀不一样。可以使用类名,不同key,创建
//不同类
String className = getClass().getSimpleName();
return className+":"+Prefix;
}
}
定义一个实现类,比如是对用户的key的定义
不允许外部创建,只能静态获取一个 对象实例。
这里定义了两种 prefix 一个是id,一个是name
public class UserKey extends BasePrefix {
private UserKey(String prefix) {
super( prefix);
}
public static UserKey getById = new UserKey("id");
public static UserKey getGetByName = new UserKey("name");
}
比如我们这里我们使用 id。那么最后的key是 UserKey:id key
这里的key就使用这个用户的id。
所以控制器如下
@RequestMapping(value = "/redis/get")
@ResponseBody
public User redisGet(){
User user = redisService.get(UserKey.getById,""+1,User.class);
return user;
}
@RequestMapping(value = "/redis/set")
@ResponseBody
public boolean redisSet(){
User user = new User(1,"Recar");
boolean ret = redisService.set(UserKey.getById,""+1,user);
return ret;
}
增加自增和自减的方法
//增加一个值
public <T> Long incr(KeyPrefix prefix, String key){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
//生成真正的key
String realKey = prefix.getPrefix()+key;
return jedis.incr(realKey);
}finally {
returnToPool(jedis);
}
}
//减少一个值
public <T> Long decr(KeyPrefix prefix, String key){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
//生成真正的key
String realKey = prefix.getPrefix()+key;
return jedis.decr(realKey);
}finally {
returnToPool(jedis);
}