阿里云OSS映射的文件地址需要即时访问到最新数据,需要即时调用CDN的刷新预热类接口 RefreshObjectCaches
刷新接口。
参考官方接口文档资料:https://help.aliyun.com/document_detail/27200.html?spm=5176.doc27149.6.174.rsPZgC
官方接口调用方式(签名):https://help.aliyun.com/document_detail/27149.html?spm=5176.doc27200.6.154.ldVcDB
直接上代码:
package com.lwj.util.aliyuncdn;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.SimpleTimeZone;
import java.util.TreeMap;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import com.lwj.util.aliyunoss.AliyunOssServerInfo;
import sun.misc.BASE64Encoder;
/**
*
* @Description :阿里云OSS服务器CDN刷新缓存
* @author : liwenjian
* @version : 1.0
* @Date : 2016年8月22日 上午9:37:47
*/
public class AliyunCdnUtils {
private static final String cdn_server_address = "https://cdn.aliyuncs.com";
/**
* 刷新缓存
*
* @param objectPath
* @return
*/
public static String refreshObjectCaches(String objectPath) {
// Map<String, String> param = new TreeMap<String, String>();
// param.put("Action", "RefreshObjectCaches");
// param.put("ObjectPath",
// "http://b1.goimg.cn/test/images/1471590829296.png");
// param.put("ObjectType", "File");
AliyunCdnUtils cdn = new AliyunCdnUtils();
Map<String, String> param = new TreeMap<String, String>();
param.put("Action", "RefreshObjectCaches");
param.put("ObjectPath", objectPath);
param.put("ObjectType", "File");
String url = cdn.compose_url(param);
System.out.println("Aliyun CDN RefreshObjectCaches Request Url:" + url);
HttpClient client = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
return EntityUtils.toString(entity, Charset.forName("UTF-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 组合请求路径
*
* @param user_params
* @return
*/
private String compose_url(Map<String, String> user_params) {
// 请求的时间戳。日期格式按照ISO8601标准表示,并需要使用UTC时间。格式为:YYYY-MM-DDThh:mm:ssZ。
// 例如,2014-11-11T12:00:00Z(为北京时间2014年11月11日20点0分0秒)
SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd'T'hh:mm:ss'Z'");
sdf.setTimeZone(new SimpleTimeZone(0, "GMT"));
String timestamp = sdf.format(new Date());
Map<String, String> parameters = new TreeMap<String, String>();
parameters.put("Format", "JSON");
parameters.put("Version", "2014-11-11");
parameters.put("AccessKeyId", AliyunOssServerInfo.getAccessKeyId().trim());
parameters.put("SignatureVersion", "1.0");
parameters.put("SignatureMethod", "HMAC-SHA1");
parameters.put("SignatureNonce", String.valueOf(System.currentTimeMillis()));
parameters.put("TimeStamp", timestamp);
// 添加用户请求参数到签名map中
Iterator<Entry<String, String>> iterator = user_params.entrySet().iterator();
while (iterator.hasNext()) {
Entry<String, String> entry = iterator.next();
parameters.put(entry.getKey(), entry.getValue());
}
String signature = compute_signature(parameters, AliyunOssServerInfo.getAccessKeySecret());
parameters.put("Signature", signature);
return cdn_server_address + "/?" + map_to_url(parameters);
}
/**
* 计算签名
*
* @param parameters
* @param access_key_secret
* @return
* @throws UnsupportedEncodingException
* @throws NoSuchAlgorithmException
*/
private String compute_signature(Map<String, String> parameters, String access_key_secret) {
try {
StringBuilder canonicalizedQueryString = new StringBuilder();
// 调用Map进行字典排序
parameters = sortMap(parameters);
// 一、按照参数名称的字典顺序对请求中所有的请求参数(包括文档中描述的“公共请求参数”和给定了的请求接口的自定义参数,但不能包括“公共请求参数”中提到Signature参数本身)进行排序。
// 遍历组合组合签名
Iterator<Entry<String, String>> iterator = parameters.entrySet().iterator();
while (iterator.hasNext()) {
Entry<String, String> entry = iterator.next();
// 对Map键值对进行URL编码
// 二、对每个请求参数的名称和值进行编码。名称和值要使用UTF-8字符集进行URL编码,URL编码的编码规则是:
// (1)对于字符 A-Z、a-z、0-9以及字符“-”、“_”、“.”、“~”不编码;
// (2)对于其他字符编码成“%XY”的格式,其中XY是字符对应ASCII码的16进制表示。比如英文的双引号(”)对应的编码就是%22
// (3)对于扩展的UTF-8字符,编码成“%XY%ZA…”的格式;
// (4)需要说明的是英文空格( )要被编码是%20,而不是加号(+)。
canonicalizedQueryString.append("&").append(percent_encode(entry.getKey())).append("=")
.append(percent_encode(entry.getValue()));
}
// 三、调用percent_encode方法把编码后的字符串中加号(+)替换成%20、星号(*)替换成%2A、%7E替换回波浪号(~)
String stringToSign = "GET&%2F&" + percent_encode(canonicalizedQueryString.toString().substring(1).trim());
// 按照RFC2104的定义,使用上面的用于签名的字符串计算签名HMAC值。注意:计算签名时使用的Key就是用户持有的Access
// Key Secret并加上一个“&”字符(ASCII:38),使用的哈希算法是SHA1
String key = AliyunOssServerInfo.getAccessKeySecret() + "&";
SecretKey secretKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(secretKey);
byte[] sign = mac.doFinal(stringToSign.getBytes());
System.out.println("stringToSign:" + stringToSign);
// 得到签名
String signature = (new BASE64Encoder()).encode(sign);
System.out.println("signature:" + signature);
return percent_encode(signature);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* map转为请求URL
*
* @param parameters
* @return
*/
private String map_to_url(Map<String, String> parameters) {
try {
parameters = sortMap(parameters);
StringBuilder url = new StringBuilder();
Iterator<Entry<String, String>> iterator = parameters.entrySet().iterator();
while (iterator.hasNext()) {
Entry<String, String> entry = iterator.next();
url.append("&").append(entry.getKey()).append("=").append(entry.getValue());
}
return url.toString().substring(1);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 转换特殊字符
*
* @param param
* @return
*/
private String percent_encode(String param) {
try {
// 名称和值要使用UTF-8字符集进行URL编码
param = URLEncoder.encode(param, "UTF-8");
param = param.replaceAll("\\+", "%20");
param = param.replaceAll("\\*", "%2A");
param = param.replaceAll("%7E", "~");
return param;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* Map排序
*
* @param parameters
* @return
*/
private Map<String, String> sortMap(Map<String, String> parameters) {
if (parameters.isEmpty()) {
return null;
}
// 按字典排序
Map<String, String> sortMap = new TreeMap<String, String>(new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
// 指定排序器按照降序排列
// return o2.compareTo(o1);
// 指定排序器按照升序序排列
return o1.compareTo(o2);
}
});
sortMap.putAll(parameters);
return sortMap;
}
public static void main(String[] args) {
AliyunCdnUtils a = new AliyunCdnUtils();
Map<String, String> param = new TreeMap<String, String>();
param.put("Action", "RefreshObjectCaches");
param.put("ObjectPath", "http://b1.goimg.cn/test/images/1471590829296.png");
param.put("ObjectType", "File");
String url = a.compose_url(param);
System.out.println("request url:" + url);
HttpClient client = HttpClients.createDefault();
HttpGet httpgets = new HttpGet(url);
try {
HttpResponse response = client.execute(httpgets);
HttpEntity entity = response.getEntity();
System.out.println(EntityUtils.toString(entity, Charset.forName("UTF-8")));
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
成功提示:
{"RefreshTaskId":"466571432","RequestId":"1F401222-FA52-4F26-B9C2-1CFDEEA58DAB"}