阿里云OSS Api版本（不使用sdk）工具类

本文工具实现了OSS简单的上传和下载功能，一个工具类搞定，不用集成oss sdk

 阿里云官方文档地址：https://helpcdn.aliyun.com/document_detail/31947.html

工具类代码

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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 javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.*;

public class OssWebApi {

    private static final String ossBucket= "xxx";
    private static final String accessKeyId= "xxx";
    private static final String secretAccessKey= "xxx";

　　 //可根据自己的oss产品自行更改域名
    private static final String endpoint= "oss-cn-shanghai.aliyuncs.com/";

    private final static String CHARSET_UTF8 = "utf8";
    private final static String ALGORITHM = "HmacSHA1";

    //OSS读取
    public static String getOssObj(String key) throws IOException {
        String signResourcePath = "/"+ossBucket+key;
        String url = "http://"+ossBucket+"."+endpoint;

        String date = getGMTDate();
        String Signature = (hmacSha1(buildGetSignData(date,signResourcePath),secretAccessKey));

        String Authorization = "OSS " + accessKeyId + ":" + Signature;

        Map<String,String> head = new HashMap<String,String>();
        head.put("Date",date);
        head.put("Authorization",Authorization);
        return get(url + key, head);
    }

    //OSS上传
    public static String putOssObj(String key,String content) throws IOException {
        String date = getGMTDate();

        String signResourcePath = "/"+ossBucket+key;
        String connectUrl = "http://"+ossBucket+"."+endpoint;

        String Signature = (hmacSha1(buildPutSignData(date,signResourcePath),secretAccessKey));
        String Authorization = "OSS " + accessKeyId + ":" + Signature;

        URL putUrl = new URL(connectUrl + key);
        HttpURLConnection connection;
        StringBuffer sbuffer = null;

        try {
            //添加 请求内容
            connection= (HttpURLConnection) putUrl.openConnection();
            //设置http连接属性
            connection.setDoOutput(true);
            connection.setRequestMethod("PUT");
            //设置请求头
            connection.setRequestProperty("Date", date);
            connection.setRequestProperty("Authorization", Authorization);

            connection.setReadTimeout(10000);//设置读取超时时间
            connection.setConnectTimeout(10000);//设置连接超时时间
            connection.connect();
            OutputStream out = connection.getOutputStream();
            out.write(new String(content).getBytes());
            out.flush();
            out.close();
            //读取响应
            if (connection.getResponseCode()==200) {
                // 从服务器获得一个输入流
                InputStreamReader inputStream =new InputStreamReader(connection.getInputStream());
                BufferedReader reader = new BufferedReader(inputStream);

                String lines;
                sbuffer= new StringBuffer("");

                while ((lines = reader.readLine()) != null) {
                    lines = new String(lines.getBytes(), "utf-8");
                    sbuffer.append(lines);
                }
                reader.close();
            }else{
                //连接失败
                return null;
            }
            //断开连接
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return key;
    }


    public static String get(String url,Map<String,String> head)throws IOException {
        HttpClient client = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);
        for(String key : head.keySet()){
            httpGet.setHeader(key,head.get(key));
        }
        HttpResponse response = client.execute(httpGet);
        response.getEntity().getContent();
        HttpEntity entity = response.getEntity();
        return EntityUtils.toString(entity, "utf-8");
    }

    public static String hmacSha1(String data, String key) {
        try {
            Mac mac = Mac.getInstance("HmacSHA1");
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), ALGORITHM);
            mac.init(keySpec);
            byte[] rawHmac;
            rawHmac = mac.doFinal(data.getBytes(CHARSET_UTF8));
            return new String(Base64.encodeBase64(rawHmac));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String buildGetSignData(String Date,String CanonicalizedResource){
        return  "GET" + "\n"+ "\n"+ "\n"
                + Date + "\n"
                + CanonicalizedResource;
    }

    public static String buildPutSignData(String Date,String CanonicalizedResource){
        return  "PUT" + "\n"+ "\n"+ "\n"
                + Date + "\n"
                + CanonicalizedResource;
    }

    public static String getGMTDate(){
        Calendar cd = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US);
        sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
        return sdf.format(cd.getTime());
    }
}

调用示例

public class Test {
    public static void main(String[] args) throws Exception{//api请求示例
        String getResult = OssWebApi.getOssObj("/test/1.txt");
        System.out.println(getResult);

        String putResult = OssWebApi.putOssObj("/test/aaaa.txt", "this is test content");
        System.out.println(putResult);
    }
}