Memcache缓存读写

工作中经常用到缓存，写个工具页面来清理缓存：

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app 
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>My Web Application</display-name>
    <description>
        A application for test.
    </description>
    <servlet>
        <servlet-name>GetMemcache</servlet-name>
        <servlet-class>com.garinzhang.memcache.GetMemcache</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>DeleteMemcache</servlet-name>
        <servlet-class>com.garinzhang.memcache.DeleteMemcache</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>GetMemcache</servlet-name>
        <url-pattern>/getMemcache</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>DeleteMemcache</servlet-name>
        <url-pattern>/deleteMemcache</url-pattern>
    </servlet-mapping>
</web-app>

index.jsp:

<?xml version="1.0" encoding="utf-8" ?>
<%@page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %>
<html>
<head>
<script type="text/javascript" src="./js/jquery-1.9.0.min.js"></script>
<script type="text/javascript">
function submitForm(i) {
    var obj = {};
    var postUrl = "";
    if(i == '1') {
        postUrl = "./getMemcache";
    } else {
        postUrl = "./deleteMemcache";
    }
    //alert($("#cacheKeyId").val() + ":" + $("#ipPortId").val());
    $.ajax({
        type: "POST",
        url: postUrl,
        data: {cacheKey: $("#cacheKeyId").val(), ipPort: $("#ipPortId").val()}
    }).done(function(msg) {
        $("#cacheValue").val(msg);
    });
}
</script>
</head>
<body>
    <div>
        <form action="#">
            <label for="cacheKey">请输入IP&Port：</label>
            <input type="text" name="ipPort" id="ipPortId" value="192.168.0.1:12000" />
            <label for="cacheKey">请输入缓存Key：</label>
            <input type="text" name="cacheKey" id="cacheKeyId" value="cache.key.word" size="40" />
            <input type="button" name="getCache" value="查询缓存" onclick="submitForm(1);return false;" />
            <input type="button" name="deleteCache" value="删除缓存" onclick="submitForm(2);return false;" />
        </form>
    </div>
    <div style="width: 100%;">
        <div style="float: left;">
            <TEXTAREA rows="40" cols="80" readonly="readonly">
            </TEXTAREA>
        </div>
        <div style="float: left;">
            <TEXTAREA rows="40" cols="80" id="cacheValue"  readonly="readonly"></TEXTAREA>
        </div>
    </div>
</body>
</html>

GetMemcache.java:

package com.garinzhang.memcache;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.rubyeye.xmemcached.MemcachedClient;
import net.rubyeye.xmemcached.MemcachedClientBuilder;
import net.rubyeye.xmemcached.XMemcachedClientBuilder;
import net.rubyeye.xmemcached.utils.AddrUtil;

public class GetMemcache extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf-8");
        PrintWriter out = resp.getWriter();
        String cacheKey = (String) req.getParameter("cacheKey");
        String ipPort = req.getParameter("ipPort");
        System.out.println("port is: " + ipPort + ", cacheKey: " + cacheKey);
        MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil.getAddresses(ipPort));
        MemcachedClient cachedClient = builder.build();
        String output = "";
        try {
            output = cachedClient.get(cacheKey.trim());
        } catch(Exception e) {
            output = e.getMessage();
        }
        out.print(output);
        System.out.println(output);
    }
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

DeleteMemcache.java

package com.garinzhang.memcache;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.rubyeye.xmemcached.MemcachedClient;
import net.rubyeye.xmemcached.MemcachedClientBuilder;
import net.rubyeye.xmemcached.XMemcachedClientBuilder;
import net.rubyeye.xmemcached.utils.AddrUtil;

public class DeleteMemcache extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf-8");
        PrintWriter out = resp.getWriter();
        String cacheKey = req.getParameter("cacheKey").trim();
        String ipPort = req.getParameter("ipPort").trim();
        System.out.println("port is: " + ipPort + ", cacheKey: " + cacheKey);
        MemcachedClientBuilder builder = new XMemcachedClientBuilder(AddrUtil.getAddresses(ipPort));
        MemcachedClient c = builder.build();
        String output = "";
        try {
            if(c.delete(cacheKey.trim())) {
                output = "Clear Success!";
            } else {
                output = "Value already null!";
            }
        } catch(Exception e) {
            output = e.getMessage();
        }
        out.print(output);
        System.out.println(output);
    }
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

用到的jar包：

commons-logging-1.1.jar，log4j-1.2.16.jar，slf4j-api-1.6.1.jar，xmemcached-1.3.5.jar，slf4j-nop-1.6.1.jar

方便打包，改成使用Maven进行配置，以下为POM文件内容：

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>memcache_clear_online</groupId>
    <artifactId>memcache_clear_online</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <packaging>war</packaging>

    <distributionManagement>
       <snapshotRepository>
           <id>nexus-snapshots</id>
           <name>nexus-snapshots</name>
           <url>http://192.168.200.203:9090/nexus/content/repositories/snapshots/</url>
       </snapshotRepository>
       <repository>
           <id>nexus-releases</id>
           <name>nexus-releases</name>
           <url>http://192.168.200.203:9090/nexus/content/repositories/releases/</url>
       </repository>
    </distributionManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>


    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1</version>
            <exclusions>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>logkit</groupId>
                    <artifactId>logkit</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>avalon-framework</groupId>
                    <artifactId>avalon-framework</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
        </dependency>
        <dependency>
            <groupId>com.googlecode.xmemcached</groupId>
            <artifactId>xmemcached</artifactId>
            <version>1.4.1</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.6.1</version>
        </dependency>
    </dependencies>
    <build>
        <resources>
            <resource>
                <directory>src/main/resources/misc</directory>
            </resource>
            <resource>
                <directory>src/main/resources/spring</directory>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
        <testResources>
            <testResource>
                <directory>src/test/resources/misc</directory>
            </testResource>
            <testResource>
                <directory>src/test/resources/spring</directory>
            </testResource>
            <testResource>
                <directory>src/test/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </testResource>
        </testResources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.5</source>
                    <target>1.5</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

 

posted @ 2013-04-08 17:44  我是小菜鸟  阅读(635)  评论(0)  编辑  收藏  举报