今天完成的事情：

1. 在 service 里添加缓存

遇到的问题：

1. spring 报错 Could not resolve placeholder

原因：

我在多个配置文件中写了多个 <context:property-placeholder> 来引入 properties 文件

解决的方法：

因为我是 spring 3 以上的版本，可以通过加 ignore-unresolvable="true" 参数来解决，每一个都要加上。

<context:property-placeholder location=""  ignore-unresolvable="true" />

2. 测试 service 中加缓存的时候报错 

[ERROR] - com.schooner.MemCached.SchoonerSockIOPool.getSock(Unknown Source) - attempting to get SockIO from uninitialized pool!

原因：

在 web.xml 中配置 memcached.xml 并不会生效，需要在 spring 的配置文件里载入 memcached 的配置文件。

我还是不太清楚 web.xml 与 spring 配置文件的区别，一直以为把所有的配置都在 web.xml 里面引入就好了，需要再去查查资料。

解决的方法：

在 spring 配置文件里引入 memcached 的配置文件。

<import resource="classpath:memcached.xml"/>

贴一下 memcached 的配置：

memcached.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <context:property-placeholder location="classpath:memcached.properties" ignore-unresolvable="true"/>

    <bean id="memcachedPool" class="com.whalin.MemCached.SockIOPool" factory-method="getInstance"
          init-method="initialize" destroy-method="shutDown">
        <!--这个值随意但是要与下方的 memcachedClient 相同-->
        <constructor-arg>
            <value>memcachedPool</value>
        </constructor-arg>
        <property name="servers">
            <!--可以配置多个 server-->
            <list>
                <value>${memcached.server}</value>
            </list>
        </property>

        <property name="failover" value="${memcached.failover}"/>
        <property name="initConn" value="${memcached.initConn}"/>
        <property name="minConn" value="${memcached.minConn}"/>
        <property name="maxConn" value="${memcached.maxConn}"/>
        <property name="maintSleep" value="${memcached.maintSleep}"/>
        <property name="nagle" value="${memcached.nagle}"/>
        <property name="socketTO" value="${memcached.socketTO}"/>
        <property name="aliveCheck" value="${memcached.aliveCheck}"/>
    </bean>

    <bean id="memcachedClient" class="com.whalin.MemCached.MemCachedClient">
        <constructor-arg>
            <value>memcachedPool</value>
        </constructor-arg>
    </bean>
</beans>

memcached.properties

memcached.server = 127.0.0.1:11211
memcached.failover = true
memcached.initConn = 20
memcached.minConn = 10
memcached.maxConn = 40
memcached.maintSleep = 3000
memcached.nagle = false
memcached.socketTO = 3000
memcached.aliveCheck = true

单独测试 memcached 的单元测试（正常无报错）：

package cn.mogeek.jsptiles.util;

import com.whalin.MemCached.MemCachedClient;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

/**
 * @ClassName MemcachedTest
 * @Description memcached 测试
 * @Author owlwinter
 * @Date 2020/6/22 22:44
 * @Version 1.0
 **/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:memcached.xml"})
public class MemcachedTest {

    @Resource(name = "memcachedClient")
    private MemCachedClient memCachedClient;

    @Test
    public void testSerAndGet(){
        Assert.assertNotNull(memCachedClient);
        System.out.println(memCachedClient.keyExists("list"));
        List<String> list = new ArrayList<>();
        list.add("a");
        list.add("b");

        memCachedClient.set("strList", list);

        List<String> result = (List<String>) memCachedClient.get("strList");
        Assert.assertNotNull(result);
        if (result != null && result.size() > 0){
            for (String str :
                    result) {
                System.out.println(str);
            }
        }
    }
}

插入 service 的 MemcachedUtil.java

package cn.mogeek.util;

import com.whalin.MemCached.MemCachedClient;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.annotation.Resource;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;

/**
 * @ClassName MemcachedUtil
 * @Description memcached 工具类
 * @Author owlwinter
 * @Date 2020/6/23 19:04
 * @Version 1.0
 **/
public class MemcachedUtil {
    private static final Logger logger = LogManager.getLogger(MemcachedUtil.class);
    private static MemCachedClient memCachedClient = null;

    /*@Resource(name = "memcachedClient")
    private static MemCachedClient memcachedClient;*/

    static {
        if (memCachedClient == null){
            memCachedClient = new MemCachedClient("memcachedPool");
        }
    }

    private MemcachedUtil(){}

/* code */
}

收获：

1. web.xml 与 spring 的配置文件有差异，需要学习一下

明天的计划：

1. 查 bug