Object Storage Service:Envoi via formulaire (OSS SDK for Java 1.0)

import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.internal.OSSUtils;
import com.aliyun.oss.model.Callback;
import org.apache.commons.codec.binary.Base64;

import javax.activation.MimetypesFileTypeMap;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import com.aliyun.oss.ClientException;

public class PostObjectSample {
    // Specify the full path of the local file to upload.
    private String localFilePath = "yourLocalFile";
    // The endpoint of the China (Hangzhou) region is used as an example. Specify the actual endpoint.
    private String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
    // An AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using an AccessKey pair is a high-risk operation. We recommend that you use a RAM user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console.
    String accessKeyId = System.getenv("OSS_ACCESS_KEY_ID");
    String accessKeySecret = System.getenv("OSS_ACCESS_KEY_SECRET");
    // Specify the bucket name.
    private String bucketName = "yourBucketName";
    // Specify the full path of the object. Do not include the bucket name.
    private String objectName = "yourObjectName";
    // Set the URL of the callback server. Example: http://oss-demo.oss-cn-hangzhou.aliyuncs.com:23450 or http://127.0.0.1:9090.
    private String callbackServerUrl = "yourCallbackServerUrl";
    // Set the value of the Host header in the callback request. Example: oss-cn-hangzhou.aliyuncs.com.
    private String callbackServerHost = "yourCallbackServerHost";    
    /**
     * Form upload.
     * @throws Exception
     */
    private void PostObject() throws Exception {
        // Add the bucket name to the URL. The URL format is http://yourBucketName.oss-cn-hangzhou.aliyuncs.com.
        String urlStr = endpoint.replace("http://", "http://" + bucketName+ ".");
        // Set the form map.
        Map<String, String> formFields = new LinkedHashMap<String, String>();
        // Set the object name.
        formFields.put("key", this.objectName);
        // Set Content-Disposition.
        formFields.put("Content-Disposition", "attachment;filename="
                + localFilePath);
        // Set callback parameters.
        // Callback callback = new Callback();
        // Set the URL of the callback server. Example: http://oss-demo.oss-cn-hangzhou.aliyuncs.com:23450 or http://127.0.0.1:9090.
        // callback.setCallbackUrl(callbackServerUrl);
        // Set the value of the Host header in the callback request, such as oss-cn-hangzhou.aliyuncs.com.
        // callback.setCallbackHost(callbackServerHost);
        // Set the value of the request body for the callback.
        // callback.setCallbackBody("{\\\"mimeType\\\":${mimeType},\\\"size\\\":${size}}");
        // Set the Content-Type of the callback request.
        // callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
        // Set custom parameters for the callback request. Each parameter is a key-value pair. The key must start with x: and be in lowercase.
        // callback.addCallbackVar("x:var1", "value1");
        // callback.addCallbackVar("x:var2", "value2");
        // Set the callback parameters in the form map.
        // setCallBack(formFields, callback);
        // Set OSSAccessKeyId.
        formFields.put("OSSAccessKeyId", accessKeyId);
        String policy = "{\"expiration\": \"2120-01-01T12:00:00.000Z\",\"conditions\": [[\"content-length-range\", 0, 104857600]]}";
        String encodePolicy = new String(Base64.encodeBase64(policy.getBytes()));
        // Set the policy.
        formFields.put("policy", encodePolicy);
        // Generate a signature.
        String signaturecom = com.aliyun.oss.common.auth.ServiceSignature.create().computeSignature(accessKeySecret, encodePolicy);
        // Set the signature.
        formFields.put("Signature", signaturecom);
        String ret = formUpload(urlStr, formFields, localFilePath);
        System.out.println("Post Object [" + this.objectName + "] to bucket [" + bucketName + "]");
        System.out.println("post reponse:" + ret);
    }
    private static String formUpload(String urlStr, Map<String, String> formFields, String localFile)
            throws Exception {
        String res = "";
        HttpURLConnection conn = null;
        String boundary = "9431149156168";
        try {
            URL url = new URL(urlStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(30000);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("User-Agent",
                    "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");            
            conn.setRequestProperty("Content-Type",
                    "multipart/form-data; boundary=" + boundary);
            OutputStream out = new DataOutputStream(conn.getOutputStream());
            // Traverse the form map, read the data, and write the data to the output stream.
            if (formFields != null) {
                StringBuffer strBuf = new StringBuffer();
                Iterator<Map.Entry<String, String>> iter = formFields.entrySet().iterator();
                int i = 0;
                while (iter.hasNext()) {
                    Map.Entry<String, String> entry = iter.next();
                    String inputName = entry.getKey();
                    String inputValue = entry.getValue();
                    if (inputValue == null) {
                        continue;
                    }
                    if (i == 0) {
                        strBuf.append("--").append(boundary).append("\r\n");
                        strBuf.append("Content-Disposition: form-data; name=\""
                                + inputName + "\"\r\n\r\n");
                        strBuf.append(inputValue);
                    } else {
                        strBuf.append("\r\n").append("--").append(boundary).append("\r\n");
                        strBuf.append("Content-Disposition: form-data; name=\""
                                + inputName + "\"\r\n\r\n");
                        strBuf.append(inputValue);
                    }
                    i++;
                }
                out.write(strBuf.toString().getBytes());
            }
            // Read the file information and write the file to upload to the output stream.
            File file = new File(localFile);
            String filename = file.getName();
            String contentType = new MimetypesFileTypeMap().getContentType(file);
            if (contentType == null || contentType.equals("")) {
                contentType = "application/octet-stream";
            }
            StringBuffer strBuf = new StringBuffer();
            strBuf.append("\r\n").append("--").append(boundary)
                    .append("\r\n");
            strBuf.append("Content-Disposition: form-data; name=\"file\"; "
                    + "filename=\"" + filename + "\"\r\n");
            strBuf.append("Content-Type: " + contentType + "\r\n\r\n");
            out.write(strBuf.toString().getBytes());
            DataInputStream in = new DataInputStream(new FileInputStream(file));
            int bytes = 0;
            byte[] bufferOut = new byte[1024];
            while ((bytes = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, bytes);
            }
            in.close();
            byte[] endData = ("\r\n--" + boundary + "--\r\n").getBytes();
            out.write(endData);
            out.flush();
            out.close();
            // Read the returned data.
            strBuf = new StringBuffer();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                strBuf.append(line).append("\n");
            }
            res = strBuf.toString();
            reader.close();
            reader = null;
        } catch (ClientException e) {
            System.err.println("Send post request exception: " + e);
            System.err.println(e.getErrorCode()+" msg="+e.getMessage());
            throw e;
        } finally {
            if (conn != null) {
                conn.disconnect();
                conn = null;
            }
        }
        return res;
    }
    private static void setCallBack(Map<String, String> formFields, Callback callback) {
        if (callback != null) {
            String jsonCb = OSSUtils.jsonizeCallback(callback);
            String base64Cb = BinaryUtil.toBase64String(jsonCb.getBytes());
            formFields.put("callback", base64Cb);
            if (callback.hasCallbackVar()) {
                Map<String, String> varMap = callback.getCallbackVar();
                for (Map.Entry<String, String> entry : varMap.entrySet()) {
                    formFields.put(entry.getKey(), entry.getValue());
                }
            }
        }
    }
    public static void main(String[] args) throws Exception {
        PostObjectSample ossPostObject = new PostObjectSample();
        ossPostObject.PostObject();
    }
}