买了3年的服务器 所以要玩些什么东西呢？

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq1782/article/details/79762610

先随便装点东西吧

1.Redis

$ wget http://download.redis.io/releases/redis-4.0.9.tar.gz

$ tar xzf redis-4.0.9.tar.gz

$ cd redis-4.0.9

$ make

$ cd src

$ make install

安装的时候遇见了几个问题：

1.

在linux系统上对redis源码进行编译时提示提示“make cc Command not found，make: *** [adlist.o] Error 127”。在进行linux系统安装时，尤其是进行linux服务器安装时，系统工程师往往会最小化安装相应的在linux系统。那么，在这样的linux系统上进行源码文件编译安装时，通常都会出现cc: Command not found，这说明系统上没有安装C语言环境，需要安装，在linux系统上的C环境是gcc，因此需要安装gcc。

  解决办法：执行命令- yum  install  gcc

2.

       error: jemalloc/jemalloc.h: No such file or directory

说关于分配器allocator， 如果有MALLOC  这个 环境变量， 会有用这个环境变量的 去建立Redis。而且libc 并不是默认的 分配器， 默认的是 jemalloc, 因为 jemalloc 被证明 有更少的 fragmentation problems 比libc。但是如果你又没有jemalloc 而只有 libc 当然 make 出错。 所以加这么一个参数。

解决办法 ：make MALLOC=libc

3.

    

make完后 redis-2.8.17目录下会出现编译后的redis服务程序redis-server,还有用于测试的客户端程序redis-cli,两个程序位于安装目录 src 目录下：

./redis-server ../redis.conf  之后执行命令./redis-cli发现没反应。直接运行bin/redis-server将以前端模式启动，前端模式启动的缺点是ssh命令窗口关闭则redis-server程序结束，不推荐使用此方法。

解决办法：设置后端启动：修改redis.conf配置文件， daemonize yes 以后端模式启动。

Redis安装好之后就要考虑怎么使用它啦，先用Java配置一下RedisPool，通过它来对Redis进行操作。redisTemplate参考之前的代码，要记得connectionFactory的要设置连接的地址和验证密码(修改redis.conf的配置 reqirepass 设置密码 bind 127.0.0.1注掉 让自己的ip也可以访问)

package com.xpj.redis;

import java.util.concurrent.locks.ReentrantLock;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
 * Redis 工具类
 */
public class RedisUtil {

	protected static ReentrantLock lockPool = new ReentrantLock();
	protected static ReentrantLock lockJedis = new ReentrantLock();

	protected static Logger logger = Logger.getLogger(RedisUtil.class);

	/** Redis服务器IP */
	private static String ADDR_ARRAY = "Ip1,Ip2";

	/** Redis的端口号 */
	private static int PORT = 6379;

	/** 访问密码 */
	private static String AUTH = "passward";

	/**
	 * 可用连接实例的最大数目，默认值为8；
	 * 如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
	 */
	private static int MAX_ACTIVE = 8;

	/** 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。 */
	private static int MAX_IDLE = 8;

	/**
	 * 等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。 如果超过等待时间，则直接抛出JedisConnectionException；
	 */
	private static int MAX_WAIT = 3000;

	/** 超时时间 */
	private static int TIMEOUT = 10000;

	/** 在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的； */
	private static boolean TEST_ON_BORROW = false;

	private static JedisPool jedisPool = null;

	/**
	 * redis过期时间,以秒为单位
	 */
	public final static int EXRP_HOUR = 60 * 60; // 一小时
	public final static int EXRP_DAY = 60 * 60 * 24; // 一天
	public final static int EXRP_MONTH = 60 * 60 * 24 * 30; // 一个月

	/**
	 * 初始化Redis连接池
	 */
	private static void initialPool() {
		try {
			JedisPoolConfig config = new JedisPoolConfig();
			config.setMaxTotal(MAX_ACTIVE);
			config.setMaxIdle(MAX_IDLE);
			config.setMaxWaitMillis(MAX_WAIT);
			config.setTestOnBorrow(TEST_ON_BORROW);
			jedisPool = new JedisPool(config, ADDR_ARRAY.split(",")[0], PORT, TIMEOUT, AUTH);
		} catch (Exception e) {
			logger.error("First create JedisPool error : " + e);
			try {
				// 如果第一个IP异常，则访问第二个IP
				JedisPoolConfig config = new JedisPoolConfig();
				config.setMaxTotal(MAX_ACTIVE);
				config.setMaxIdle(MAX_IDLE);
				config.setMaxWaitMillis(MAX_WAIT);
				config.setTestOnBorrow(TEST_ON_BORROW);
				jedisPool = new JedisPool(config, ADDR_ARRAY.split(",")[1], PORT, TIMEOUT, AUTH);
			} catch (Exception e2) {
				logger.error("Second create JedisPool error : " + e2);
			}
		}
	}

	/**
	 * 在多线程环境同步初始化
	 */
	private static void poolInit() {
		lockPool.lock();
		try {
			if (jedisPool == null) {
				initialPool();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			lockPool.unlock();
		}
	}

	/**
	 * 得到Jedis连接
	 * @return
	 */
	public static Jedis getJedis() {
		lockJedis.lock();
		if (jedisPool == null) {
			poolInit();
		}
		Jedis jedis = null;
		try {
			if (jedisPool != null) {
				jedis = jedisPool.getResource();
			}
		} catch (Exception e) {
			e.printStackTrace();
			logger.error("Get jedis error : " + e);
		} finally {
			returnResource(jedis);
			lockJedis.unlock();
		}
		return jedis;
	}

	/**
	 * 释放jedis资源
	 *
	 * @param jedis
	 */
	public static void returnResource(final Jedis jedis) {
		if (jedis != null && jedisPool != null) {
			jedisPool.close();
		}
	}

	/**
	 * 设置 String
	 *
	 * @param key
	 * @param value
	 */
	public synchronized static void setString(String key, String value) {
		try {
			value = StringUtils.isEmpty(value) ? "" : value;
			getJedis().set(key, value);
		} catch (Exception e) {
			logger.error("Set key error : " + e);
		}
	}

	/**
	 * 设置 过期时间
	 *
	 * @param key
	 * @param seconds
	 *            以秒为单位
	 * @param value
	 */
	public synchronized static void setString(String key, int seconds, String value) {
		try {
			value = StringUtils.isEmpty(value) ? "" : value;
			getJedis().setex(key, seconds, value);
		} catch (Exception e) {
			logger.error("Set keyex error : " + e);
		}
	}

	/**
	 * 获取String值
	 *
	 * @param key
	 * @return value
	 */
	public synchronized static String getString(String key) {
		if (getJedis() == null || !getJedis().exists(key)) {
			return null;
		}
		return getJedis().get(key);
	}
}

上面的代码记得有参考过某个大神的代码来着，侵删。

2.Mysql（红色为命令）

    1.yum install mysql-server

Loading mirror speeds from cached hostfile

No package mysql-server available.

Error: Nothing to do

    错误： yum list | grep mysql 来查找yum源中是否有mysql,然后发现找不到，所以要自己去下载mysql安装源。

              wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

              rpm -ivh mysql-community-release-el7-5.noarch.rpm (注意这里好像不是最新的版本 哈哈)

              yum install  mysql mysql-server mysql-libs mysql-server（途中确认一下就好）

              错误：Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

              systemctl start mysqld( 启动MySQL服务)

              systemctl enable mysqld

         systemctl daemon-reload（ 设置mysql服务开机自启动）

输入mysql 进入mysql命令行的模式;

        set password for 'root'@'localhost'=password('newPassword')(修改密码)

        grant all privileges on *.* to 'root'@'%' with grant option;（修改权限可以使其他机器登录:）

       flush privileges;

        grant all privileges on 'root'@'%' identified by 'xymt1234';（解决问题: Access denied for user ‘root’@’localhost’ (using password:YES)）

        flush privileges;

   

至此终于可以在本地连接上Mysql数据库啦，查看了一下可以设置数据类型为json和enum,所以大概还是可用的版本。下一步就是用mybatisgenegrator来进行和数据的同步工作啦。

3.Mybatis

            1.    

                如果在工程中使用了maven构建工具，那么就会出现一个问题：我们知道在典型的maven工程中，目录结构有：src/main/java和src/main/resources，前者是用来存放java源代码的，后者则是存放一些资源文件，比如配置文件等，在默认的情况下maven打包的时候，对于src/main/java目录只打包源代码，而不会打包其他文件。所以此时如果把对应的mapper文件放到src/main/java目录下时，不会打包到最终的jar文件夹中，也不会输出到target文件夹中，由于在进行单元测试的时候执行的是/target目录下/test-classes下的代码，所以在测试的时候也不会成功。

                为了实现在maven默认环境下打包时，Mybatis的接口和mapper文件在同一包中，可以通过将接口文件放在src/main/java某个包中，而在src/main/resources目录中建立同样的包，这是一种约定优于配置的方式，这样在maven打包的时候就会将src/main/java和src/main/resources相同包下的文件合并到同一包中。

在默认maven打包的环境下，不要将接口文件和mapper文件全部放到src/main/java，这样也不会把mapper文件打包进去

      

                如果不想将接口和mapper文件分别放到 src/main/java和 src/main/resources中，而是全部放到 src/main/java，那么在构建的时候需要指定maven打包需要包括xml文件，具体配置如下：

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

检讨一下自己犯得错误：

1.自动生成的全部放在了src/main/java的包里面,但没有修改打包配置

2.interface和mapper.xml分别放在了不同名字的包里面,导致产生了nvalid bound statement (not found): com.xpj.dao.mapper.UserMapper.selectBy的错误

    用自动化插件之后能顺利的封装增删查过的操作啦，而且顺利的测试了前面的redisUtil和cacheable的应用，服务器里面redis里面也存储了相应的数据，注意@cacheable一定要有对应的名称，不然会报No cache could be resolved for 'Builder'的错误。下面展示一下生成自动的代码，总感觉和之前比先进了一点。就是自动生成的，所以没配置localdatetime.

import java.io.Serializable;
import java.util.Date;

import com.xpj.config.SpringContextHolder;
import com.xpj.mapper.UserMapper;

public class User implements Serializable {
	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.id
	 *
	 * @mbg.generated
	 */
	private Integer id;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.sokeNo
	 *
	 * @mbg.generated
	 */
	private Integer sokeno;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.intro
	 *
	 * @mbg.generated
	 */
	private String intro;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.hobby
	 *
	 * @mbg.generated
	 */
	private String hobby;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.label
	 *
	 * @mbg.generated
	 */
	private String label;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.crt_time
	 *
	 * @mbg.generated
	 */
	private Date crtTime;

	/**
	 *
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database column usert.upt_time
	 *
	 * @mbg.generated
	 */
	private Date uptTime;

	/**
	 * This field was generated by MyBatis Generator. This field corresponds to
	 * the database table usert
	 *
	 * @mbg.generated
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * This method was generated by MyBatis Generator. This method corresponds
	 * to the database table usert
	 *
	 * @mbg.generated
	 */
	public User(Integer id, Integer sokeno, String intro, String hobby, String label, Date crtTime, Date uptTime) {
		this.id = id;
		this.sokeno = sokeno;
		this.intro = intro;
		this.hobby = hobby;
		this.label = label;
		this.crtTime = crtTime;
		this.uptTime = uptTime;
	}

	/**
	 * This method was generated by MyBatis Generator. This method corresponds
	 * to the database table usert
	 *
	 * @mbg.generated
	 */
	public User() {
		super();
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.id
	 *
	 * @return the value of usert.id
	 *
	 * @mbg.generated
	 */
	public Integer getId() {
		return id;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.id
	 *
	 * @param id
	 *            the value for usert.id
	 *
	 * @mbg.generated
	 */
	public void setId(Integer id) {
		this.id = id;
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.sokeNo
	 *
	 * @return the value of usert.sokeNo
	 *
	 * @mbg.generated
	 */
	public Integer getSokeno() {
		return sokeno;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.sokeNo
	 *
	 * @param sokeno
	 *            the value for usert.sokeNo
	 *
	 * @mbg.generated
	 */
	public void setSokeno(Integer sokeno) {
		this.sokeno = sokeno;
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.intro
	 *
	 * @return the value of usert.intro
	 *
	 * @mbg.generated
	 */
	public String getIntro() {
		return intro;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.intro
	 *
	 * @param intro
	 *            the value for usert.intro
	 *
	 * @mbg.generated
	 */
	public void setIntro(String intro) {
		this.intro = intro == null ? null : intro.trim();
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.hobby
	 *
	 * @return the value of usert.hobby
	 *
	 * @mbg.generated
	 */
	public String getHobby() {
		return hobby;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.hobby
	 *
	 * @param hobby
	 *            the value for usert.hobby
	 *
	 * @mbg.generated
	 */
	public void setHobby(String hobby) {
		this.hobby = hobby == null ? null : hobby.trim();
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.label
	 *
	 * @return the value of usert.label
	 *
	 * @mbg.generated
	 */
	public String getLabel() {
		return label;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.label
	 *
	 * @param label
	 *            the value for usert.label
	 *
	 * @mbg.generated
	 */
	public void setLabel(String label) {
		this.label = label == null ? null : label.trim();
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.crt_time
	 *
	 * @return the value of usert.crt_time
	 *
	 * @mbg.generated
	 */
	public Date getCrtTime() {
		return crtTime;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.crt_time
	 *
	 * @param crtTime
	 *            the value for usert.crt_time
	 *
	 * @mbg.generated
	 */
	public void setCrtTime(Date crtTime) {
		this.crtTime = crtTime;
	}

	/**
	 * This method was generated by MyBatis Generator. This method returns the
	 * value of the database column usert.upt_time
	 *
	 * @return the value of usert.upt_time
	 *
	 * @mbg.generated
	 */
	public Date getUptTime() {
		return uptTime;
	}

	/**
	 * This method was generated by MyBatis Generator. This method sets the
	 * value of the database column usert.upt_time
	 *
	 * @param uptTime
	 *            the value for usert.upt_time
	 *
	 * @mbg.generated
	 */
	public void setUptTime(Date uptTime) {
		this.uptTime = uptTime;
	}

	/**
	 * This method was generated by MyBatis Generator. This method corresponds
	 * to the database table usert
	 *
	 * @mbg.generated
	 */
	@Override
	public boolean equals(Object that) {
		if (this == that) {
			return true;
		}
		if (that == null) {
			return false;
		}
		if (getClass() != that.getClass()) {
			return false;
		}
		User other = (User) that;
		return (this.getId() == null ? other.getId() == null : this.getId().equals(other.getId()))
				&& (this.getSokeno() == null ? other.getSokeno() == null : this.getSokeno().equals(other.getSokeno()))
				&& (this.getIntro() == null ? other.getIntro() == null : this.getIntro().equals(other.getIntro()))
				&& (this.getHobby() == null ? other.getHobby() == null : this.getHobby().equals(other.getHobby()))
				&& (this.getLabel() == null ? other.getLabel() == null : this.getLabel().equals(other.getLabel()))
				&& (this.getCrtTime() == null ? other.getCrtTime() == null
						: this.getCrtTime().equals(other.getCrtTime()))
				&& (this.getUptTime() == null ? other.getUptTime() == null
						: this.getUptTime().equals(other.getUptTime()));
	}

	/**
	 * This method was generated by MyBatis Generator. This method corresponds
	 * to the database table usert
	 *
	 * @mbg.generated
	 */
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((getId() == null) ? 0 : getId().hashCode());
		result = prime * result + ((getSokeno() == null) ? 0 : getSokeno().hashCode());
		result = prime * result + ((getIntro() == null) ? 0 : getIntro().hashCode());
		result = prime * result + ((getHobby() == null) ? 0 : getHobby().hashCode());
		result = prime * result + ((getLabel() == null) ? 0 : getLabel().hashCode());
		result = prime * result + ((getCrtTime() == null) ? 0 : getCrtTime().hashCode());
		result = prime * result + ((getUptTime() == null) ? 0 : getUptTime().hashCode());
		return result;
	}

	public static UserMapper mapper() {
		return SpringContextHolder.getBean(UserMapper.class);
	}

	public static User findById(Integer id) {
		return mapper().selectByPrimaryKey(id);
	}
}