java开发之阿里云对象存储OSS和云数据库Memcache的使用

web开发中标配：aliyun ECS（阿里云服务器），aliyun RDS（阿里云数据库），aliyun OSS（阿里云对象存储），aliyun Memcache（阿里云缓存数据库）。

今天就介绍下OSS和Memcache的使用方法（开通方法就不详细介绍了）。

1 OSS使用demo

首先导入oss开发包

 <dependency>
             <groupId>com.aliyun.oss</groupId>
             <artifactId>aliyun-sdk-oss</artifactId>
             <version>2.0.6</version>
 </dependency>

导入开发包后开发代码如下:

package com.cyparty.security.utils;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.ObjectMetadata;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

/**
 * Created by Shadow on 2016/4/28.
 */
public class OssUtil {
    public static void main(String[] args) {
        getOSSUrl("E:/1.jpg");
    }

    public static String getOSSUrl(String filepath){
        try {
            File file = new File(filepath);
            String file_name=filepath.split("/")[filepath.split("/").length-1];
            String OssUrl=null;
            if (file.exists() && file.length() > 0) {
                OssUrl= OssUtil.getOssFilePath(file_name, filepath);
            }
            return OssUrl;

        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 获取上传到OSS的图片连接
     *
     * @param fileName       完整的文件名
     * @param uploadFilePath 文件的路径
     * @return 来自OSS的Url地址
     */
    private static String getOssFilePath(String fileName, String uploadFilePath) {
        String uri = "";
        // 创建OSSClient对象
        //todo:注意查看要链接的bucket服务器位置（shanghai or beijing or hangzhou）
        String bucket_name="laihui";
        String bucket_source="oss-cn-shanghai.aliyuncs.com";
        String accessKeyId="XXXXXXXX";
        String secretAccessKey="XXXXXXXXXXXXXX";
        OSSClient client = new OSSClient(bucket_source, accessKeyId, secretAccessKey);
        //上传图片
        String key="security/images/"+Utils.getCurrenTimeStamp()/1000+"-"+fileName; //指定文件上传到bucket下面的那个文件夹下及文件名
        boolean isSuccess= uploadFile(client, bucket_name, key, uploadFilePath);//指定bucket

        if (isSuccess) {
            //uri = "laihui.oss-cn-shanghai.aliyuncs.com/" + key;
            uri = bucket_name+bucket_source +"/"+ key;
        }
        return uri;
    }

    /**
     * 将本地图片上传至OSS的方法
     *
     * @param client     OSS外网域名
     * @param bucketName bucket的名字
     * @param key        图片的名字
     * @param filePath   所上传图片的路径
     * @return boolean类型的成功与失败状态
     */
    private static boolean uploadFile(OSSClient client, String bucketName, String key, String filePath) {
        int MAX_TRY = 3;
        int downloadTurn = 0;
        boolean uploadSuccess = false;
        while (downloadTurn < MAX_TRY) {
            try {
                File file = new File(filePath);
                if ((!file.exists()) || file.length() == 0) {
                    uploadSuccess = false;
                    break;
                }
                ObjectMetadata objectMeta = new ObjectMetadata();
                objectMeta.setContentLength(file.length());
                // 可以在metadata中标记文件类型

                if (!client.doesObjectExist(bucketName, key)) {
                    //System.out.println("开始上传文件" + filePath);
                    InputStream input = new FileInputStream(file);
                    client.putObject(bucketName, key, input, objectMeta);
                    System.out.println(filePath+"上传成功!");
                    uploadSuccess = true;
                    break;
                } else {
                    uploadSuccess = true;
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return uploadSuccess;
    }
}

accessKeyId和secretAccessKey查看方法如下图，选中个人账号-->点击-->accessKeys-->查看

2 Memcache的使用

首先导入开发包-->下载地址，导入项目中后，具体代码如下

package com.cyparty.laihui.utilities;

import com.alibaba.fastjson.JSONObject;
import net.spy.memcached.AddrUtil;
import net.spy.memcached.BinaryConnectionFactory;
import net.spy.memcached.MemcachedClient;
import net.spy.memcached.internal.OperationFuture;

public class Memcache {
    private static MemcachedClient cache=null;
    public static MemcachedClient getCache()
    {
        final String host = "XXXXXXX.m.XXXXXXX.ocs.aliyuncs.com"; //控制台上的“内网地址”
        final String port = "11211"; //默认端口 11211，不用改
        if(cache==null)
        {
            try {
                cache = new MemcachedClient(new BinaryConnectionFactory(), AddrUtil.getAddresses(host + ":" + port));
            }
            catch (Exception e)
            {
                cache=null;
                System.out.println("getCache Error:"+e.getMessage());
            }
        }
        return cache;
    }
    public static JSONObject getMemcache(String where){
        JSONObject result=new JSONObject();
        try {
            MemcachedClient cacheClient=getCache();
            if (cacheClient.get(where)==null){
                result.put("cache_status","0");
                return result;
            }else {
                return (JSONObject)cacheClient.get(where);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        result.put("status","0");
        return result;
    }

    public static void setMemcache(String where,JSONObject resultObject) {

        MemcachedClient cacheClient = null;
        try {

            cacheClient = getCache();

            //向OCS中存一个key为"ocs"的数据，便于后面验证读取数据
            String key = where;
            JSONObject value =resultObject;
            int expireTime = 60*60*24*10; // 过期时间10day，单位s; 从写入时刻开始计时，超过expireTime s后，该数据过期失效，无法再读出；
            OperationFuture future = cacheClient.set(key, expireTime, value);
            System.out.println("Set操作完成key为"+key);

            future.get(); //  确保之前(mc.set())操作已经结束
            //执行get操作，从缓存中读数据,读取key为"ocs"的数据
            System.out.println("Get操作:" + cache.get(key));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void setMemcache(String token,int id,int expireTime) {
        MemcachedClient cacheClient = null;
        try {
            cacheClient = getCache();
            //向OCS中存一个key为"ocs"的数据，便于后面验证读取数据
            String key = token;
            int value =id;
            if(expireTime<=0) {
                expireTime = 60 * 60 * 2; // 过期时间，单位s; 从写入时刻开始计时，超过expireTime s后，该数据过期失效，无法再读出；
            }
            OperationFuture future = cacheClient.set(key, expireTime, value);
            System.out.println("Set操作完成!链接为"+key);

            future.get(); //  确保之前(mc.set())操作已经结束

            //执行get操作，从缓存中读数据,读取key为"ocs"的数据
            System.out.println("Get操作:" + cache.get(key));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}