create image composition and generate the webvtt file

ImageComp.java

package com.qiniulab.ufop;

import java.util.ArrayList;
import java.util.List;

import com.qiniu.common.QiniuException;
import com.qiniu.processing.OperationManager;
import com.qiniu.util.Auth;
import com.qiniu.util.StringMap;
import com.qiniu.util.UrlSafeBase64;

public class ImageComp {

	// ufop的名称
	private String ufopName;
	// 为了保障处理效率，请使用私有队列
	private String pipeline;
	// 持久化结果自动通知接收地址，可以不填
	private String notifyURL;
	// 图片处理保存的目标空间
	private String destSaveBucket;
	// 图片处理保存的目标文件名
	private String destImageKey;
	// 授权信息
	private Auth auth;

	public ImageComp(String ufopName, String accessKey, String secretKey) {
		this.ufopName = ufopName;
		this.auth = Auth.create(accessKey, secretKey);
	}

	/**
	 * 设置图片合成的保存结果
	 */
	public void setDestTarget(String destBucket, String destKey) {
		this.destSaveBucket = destBucket;
		this.destImageKey = destKey;
	}

	/**
	 * 设置图片处理私有队列
	 */
	public void setPipeline(String pipeline) {
		this.pipeline = pipeline;
	}

	/**
	 * 设置图片处理结果通知地址
	 */
	public void setNotifyURL(String notifyURL) {
		this.notifyURL = notifyURL;
	}

	/**
	 * @param bucket
	 * @param dummyKey
	 * @param interval
	 * @param webvtt
	 * @param destFormat
	 * @param rows
	 * @param cols
	 * @param halign
	 * @param vlign
	 * @param margin
	 * @param alpha
	 * @param order
	 * @param bgColor
	 * @param urls
	 * @throws QiniuException
	 */
	public String fireUfop(String bucket, String dummyKey, int interval, String webvttSaveKey, String destImageFormat,
			int rows, int cols, String halign, String valign, int margin, int alpha, int order, String bgColor,
			List<String> urls) throws QiniuException {
		String webvttSaveEntry = String.format("%s:%s", this.destSaveBucket, webvttSaveKey);
		StringBuilder fopBuilder = new StringBuilder();
		fopBuilder.append(this.ufopName);
		fopBuilder.append("/bucket/").append(UrlSafeBase64.encodeToString(bucket));
		fopBuilder.append("/interval/").append(interval);
		fopBuilder.append("/webvtt/").append(UrlSafeBase64.encodeToString(webvttSaveEntry));
		fopBuilder.append("/dest/").append(UrlSafeBase64.encodeToString(this.destImageKey));
		if (!isNullOrEmpty(destImageFormat)) {
			fopBuilder.append("/format/").append(destImageFormat);
		}
		if (rows != 0) {
			fopBuilder.append("/rows/").append(rows);
		}
		if (cols != 0) {
			fopBuilder.append("/cols/").append(cols);
		}
		if (!isNullOrEmpty(halign)) {
			fopBuilder.append("/halign/").append(halign);
		}
		if (!isNullOrEmpty(valign)) {
			fopBuilder.append("/valign/").append(valign);
		}
		if (margin >= 0) {
			fopBuilder.append("/margin/").append(margin);
		}
		if (alpha >= 0 && alpha <= 255) {
			fopBuilder.append("/alpha/").append(alpha);
		}
		if (order == 0 || order == 1) {
			fopBuilder.append("/order/").append(order);
		}
		if (!isNullOrEmpty(bgColor)) {
			fopBuilder.append("/bgcolor/").append(UrlSafeBase64.encodeToString(bgColor));
		}

		for (String url : urls) {
			fopBuilder.append("/url/").append(UrlSafeBase64.encodeToString(url));
		}

		// set saveas
		String destImageSaveEntry = String.format("%s:%s", this.destSaveBucket, this.destImageKey);
		fopBuilder.append(String.format("|saveas/%s", UrlSafeBase64.encodeToString(destImageSaveEntry)));

		String fopCmd = fopBuilder.toString();
		OperationManager m = new OperationManager(this.auth);
		StringMap extraParams = new StringMap();

		if (!isNullOrEmpty(this.notifyURL)) {
			extraParams.put("notifyURL", this.notifyURL);
		}
		if (!isNullOrEmpty(this.pipeline)) {
			extraParams.put("pipeline", this.pipeline);
		}

		String persistentId = m.pfop(bucket, dummyKey, fopCmd, extraParams);
		return persistentId;
	}

	private boolean isNullOrEmpty(String str) {
		return str == null || str.trim().isEmpty();
	}

	public static void main(String[] args) {
		List<String> urls = new ArrayList<String>();
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000001.jpg");
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000002.jpg");
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000003.jpg");
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000004.jpg");
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000005.jpg");
		urls.add("http://7xliow.com2.z0.glb.qiniucdn.com/1441174854604_000006.jpg");

		// 合成后的图片保存空间
		String destSaveBucket = "video";
		// 合成后的图片保存的名字
		String destImageKey = "1441174854604_comp.jpg";

		// 截图的时间间隔，单位秒
		int interval = 5;

		// 截图所在的空间名称
		String bucket = "video";

		// 视频文件的名称，这个文件名可以是空间中任意的文件名，并无实际作用
		String dummyKey = "1441174854604";

		// webvtt文件的名称
		String webvttSaveKey = "1441174854604.webvtt";

		// 目标图片格式，支持png和jpeg，如果需要其他格式，可通过七牛管道处理使用imageMogr2命令生成其他格式图片
		String destImageFormat = "jpeg";

		// 目标图片的行数
		int rows = 3;

		// 目标图片的列数
		int cols = 2;

		// 目标图片中的每个图片的周边空白大小
		int margin = 10;

		// 目标图片的背景透明度
		int alpha = 255;

		// 目标图片中的每个图片的排列顺序
		int order = 1;

		// 目标图片的背景颜色
		String bgColor = "#000000";

		// ufop 名称，根据账号下部署的ufop设置
		String ufopName = "hxc-imagecomp";
		// access key & secret key
		String accessKey = "<AccessKey>";
		String secretKey = "<SecretKey>";
		String pipeline = "hksjdl001";
		String notifyURL = null;
		// 创建对象

		ImageComp composer = new ImageComp(ufopName, accessKey, secretKey);
		// 设置目标图片保存
		composer.setDestTarget(destSaveBucket, destImageKey);
		composer.setPipeline(pipeline);
		composer.setNotifyURL(notifyURL);
		try {
			String persistentId = composer.fireUfop(bucket, dummyKey, interval, webvttSaveKey, destImageFormat, rows,
					cols, null, null, margin, alpha, order, bgColor, urls);
			System.out.println(String.format("http://api.qiniu.com/status/get/prefop?id=%s", persistentId));
		} catch (QiniuException e) {
			e.printStackTrace();
		}

	}

}