图片上传

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;

import javax.servlet.http.HttpServletResponse;

import land.constant.FileConstant;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;


public class UploadFile {

	private static final int BUFFER_SIZE = 1024;// 缓存区大小

	// 上传单张图片
	// 把图片文件上传到指定的目录
	public static boolean copy(File src, File dst) {
		boolean isSuccess = false;
		try {
			InputStream in = null;
			OutputStream out = null;
			try {
				in = new BufferedInputStream(new FileInputStream(src),
						BUFFER_SIZE);
				out = new BufferedOutputStream(new FileOutputStream(dst),
						BUFFER_SIZE);
				byte[] buffer = new byte[BUFFER_SIZE];
				while (in.read(buffer) > 0) {
					out.write(buffer);
				}
			} finally {
				if (null != in) {
					in.close();
				}
				if (null != out) {
					out.close();
				}
			}
			isSuccess = true;
		} catch (Exception e) {
			isSuccess = false;
			e.printStackTrace();
		}
		return isSuccess;
	}

	// 获得文件后缀名
	public static String getExtention(String fileName) {
		int pos = fileName.lastIndexOf(".");
		return fileName.substring(pos);
	}

	// 上传多张图片
	public static String upload(File uploadify, String uploadifyFileName) {
		/* 文件扩展名 */
		String extName = "";
		/* 文件保存的位置 */    
		String saveRealFilePath = "";
		/*
		 * 相对路径，虚拟目录配置 <Context path="/images" docBase="相对路径[项目位置]"></Context>
		 * 浏览器访问图片的路径是images/xx.jpg 实际存放路径是docBase
		 */
		saveRealFilePath = ServletActionContext.getServletContext()
				.getRealPath(FileConstant.FILE_PATH);
		/*
		 * 绝对路径， 虚拟目录配置 <Context path="/images" docBase="绝对路径"></Context>
		 * 浏览器访问图片的路径是images/xx.jpg 实际存放路径是docBase
		 */
		/* saveRealFilePath = "D:\\upload"; */
		File fileDir = new File(saveRealFilePath);
		if (!fileDir.exists()) {
			fileDir.mkdirs();
		}
		File savefile;
		if (uploadifyFileName.lastIndexOf(".") >= 0) {
			extName = uploadifyFileName.substring(uploadifyFileName
					.lastIndexOf("."));
		}
		String nowTime = "" + new Date().getTime();
		savefile = new File(saveRealFilePath, nowTime + extName);
		try { 
			FileUtils.copyFile(uploadify, savefile);
		} catch (Exception e) {
			e.printStackTrace();
		}
		HttpServletResponse response = ServletActionContext.getResponse();
		try {
			response.getWriter().print(nowTime + extName);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return nowTime+extName;
	}

	public static boolean deleteFile(String filename) {
		boolean isSuccess = false;
		File imageFile = new File(ServletActionContext.getServletContext()
				.getRealPath(FileConstant.FILE_PATH) + "/" + filename);
		if (imageFile.exists()) {
			imageFile.delete();
			isSuccess = true;
		} 
		return isSuccess;
	}   
}