imageprocessor.java

一个用struts tiles的在线影院web系统

package com.eline.vod.utils;

import java.io.File;

import com.blue.imageio.ImageGenerator;
import com.blue.imageio.Size;
import com.blue.web.common.util.AppSettings;
import com.eline.vod.HttpContext;

public class ImageProcessor {
	public static String getThumb(String sourcePath, int width, int height) throws Exception {
		int n1 = sourcePath.lastIndexOf("\\");
		if (n1 < 0)
			throw new Exception("invalid path format.");
		String path = sourcePath.substring(0, n1);
		String file = sourcePath.substring(n1+1);

		n1 = file.lastIndexOf(".");
		if (n1 < 0)
			throw new Exception("invalid extension specified.");
		String fileWithoutExt = file.substring(0, n1);
		file = "thumb_" + fileWithoutExt + "-" + width + "x" + height + ".gif";
		String physicalPath = path + "\\" + file;
		File f = new File(physicalPath);
		if (!f.exists()) {
			ImageGenerator.generateThumb(sourcePath, physicalPath, new Size(width, height));
		}
		return file;
	}
	
	/**
	 * Http专用函数，获取缩略图，不抛异常，如果失败的话返回null
	 * @param url
	 * @param width
	 * @param height
	 * @return
	 */
	public static String getThumbFileURL(String url, int width, int height) {
		HttpContext ctx = HttpContext.getCurrent();
		String thumbURL = null;
		try {
			AppSettings.getInstance().getProperty(AppKeys.UPLOAD_ROOT);
			String imageURL = AppSettings.getInstance().getProperty(AppKeys.UPLOAD_ROOT)
					+ "/pictures" + url;
			int n1 = imageURL.lastIndexOf('/');
			// 获取缩略图目录url
			String urlPrefix = null;
			if (n1 >= 0)
				urlPrefix = imageURL.substring(0, n1);
			String origionFile = ctx.getRequest().getSession().getServletContext().getRealPath(imageURL);
		
			// 获取缩略图文件名(如果不存在则生成此图片)
			String thumbFile = null;
			try {
				thumbFile = ImageProcessor.getThumb(origionFile, width, height);
			} catch (Exception e) {
				System.out.println("ERROR: failure to get thumb file." + e);
			}
			if (urlPrefix != null && thumbFile != null)
				thumbURL = urlPrefix + "/" + thumbFile;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return thumbURL;
	}
	/**
	 * 
	 * @param sourcePath
	 * @param width
	 * @param height
	 * @return
	 * @throws Exception
	 */
	public static String getPostImage(String sourcePath, int width, int height) throws Exception {
		int n1 = sourcePath.lastIndexOf("\\");
		if (n1 < 0)
			throw new Exception("invalid path format.");
		String path = sourcePath.substring(0, n1);
		String file = sourcePath.substring(n1+1);
		n1 = file.lastIndexOf(".");
		if (n1 < 0)
			throw new Exception("invalid extension specified.");
		String fileWithoutExt = file.substring(0, n1);
		file = "post_" + fileWithoutExt + "-" + width + "x" + height + ".jpg";
		String physicalPath = path + "\\" + file;
		File f = new File(physicalPath);
		if (!f.exists()) {
			ImageGenerator.generateThumb(sourcePath, physicalPath, new Size(width, height));
		}
		return file;
	}
	/**
	 * 
	 * @param url
	 * @param width
	 * @param height
	 * @return
	 */
	public static String getPostImageFileURL(String url, int width, int height) {
		HttpContext ctx = HttpContext.getCurrent();
		String resultURL = null;
		try {
			AppSettings.getInstance().getProperty(AppKeys.UPLOAD_ROOT);
			String imageURL = AppSettings.getInstance().getProperty(AppKeys.UPLOAD_ROOT)
					+ "/pictures" + url;
			int n1 = imageURL.lastIndexOf('/');
			// 获取缩略图目录url
			String urlPrefix = null;
			if (n1 >= 0)
				urlPrefix = imageURL.substring(0, n1);
			String origionFile = ctx.getRequest().getSession().getServletContext().getRealPath(imageURL);
		
			// 获取缩略图文件名(如果不存在则生成此图片)
			String thumbFile = null;
			try {
				thumbFile = ImageProcessor.getPostImage(origionFile, width, height);
			} catch (Exception e) {
				System.out.println("ERROR: failure to get thumb file." + e);
			}
			if (urlPrefix != null && thumbFile != null)
				resultURL = urlPrefix + "/" + thumbFile;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return resultURL;
	}
	
	public static void main(String[] args) {
		try {
			System.out.println(ImageProcessor.getThumb("c:\\logs\\Img243507655.jpg", 100, 150));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}