down.jsp

基于J2EE的办公自动化系统。实现流程定义流程办理等。运用了hibernate+struts+spring框架综合运用的系统。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.io.BufferedInputStream"%>
<%@ page import="java.io.FileInputStream"%>
<%@ page import="java.io.BufferedOutputStream"%>
<%!/**
	 * 将文件名中的汉字转为UTF8编码的串,以便下载时能正确显示另存的文件名.
	 * @param s 原文件名
	 * @return 重新编码后的文件名
	 */
	public static String toUtf8String(String s) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			if (c >= 0 && c <= 255) {
				sb.append(c);
			} else {
				byte[] b;
				try {
					b = Character.toString(c).getBytes("utf-8");
				} catch (Exception ex) {
					System.out.println(ex);
					b = new byte[0];
				}
				for (int j = 0; j < b.length; j++) {
					int k = b[j];
					if (k < 0)
						k += 256;
					sb.append("%" + Integer.toHexString(k).toUpperCase());
				}
			}
		}
		return sb.toString();
	}

	/**
	 * Utf8URL解码
	 * @param text
	 * @return
	 */
	public String Utf8URLdecode(String text) {
		String result = "";
		int p = 0;
		if (text != null && text.length() > 0) {
			text = text.toLowerCase();
			p = text.indexOf("%e");
			if (p == -1) {
				return text;
			}
			while (p != -1) {
				result += text.substring(0, p);
				text = text.substring(p, text.length());
				if (text == "" || text.length() < 9) {
					return result;
				}
				result += CodeToWord(text.substring(0, 9));//调用CodeToWord方法
				text = text.substring(9, text.length());
				p = text.indexOf("%e");
			}
		}
		return result + text;
	}

	/**
	 * utf8URL编码转字符
	 * @param text
	 * @return
	 */
	private String CodeToWord(String text) {
		String result;
		if (Utf8codeCheck(text)) {//调用Utf8codeCheck方法
			byte[] code = new byte[3];
			code[0] = (byte) (Integer.parseInt(text.substring(1, 3), 16) - 256);
			code[1] = (byte) (Integer.parseInt(text.substring(4, 6), 16) - 256);
			code[2] = (byte) (Integer.parseInt(text.substring(7, 9), 16) - 256);
			try {
				result = new String(code, "UTF-8");
			} catch (Exception ex) {
				result = null;
			}
		} else {
			result = text;
		}
		return result;
	}

	/**
	 * 编码是否有效
	 * @param text
	 * @return
	 */
	private boolean Utf8codeCheck(String text) {
		String sign = "";
		if (text.startsWith("%e")) {
			for (int i = 0, p = 0; p != -1; i++) {
				p = text.indexOf("%", p);
				if (p != -1) {
					p++;
				}
				sign += p;
			}
		}
		return sign.equals("147-1");
	}

	%>

<%
			String path = request.getContextPath();
			String basePath = request.getScheme() + "://"
					+ request.getServerName() + ":" + request.getServerPort()
					+ path + "/";

			BufferedInputStream bis = null;
			BufferedOutputStream bos = null;
			try {
				String filename = request.getParameter("filename");
				System.out.println("1:" + filename);
				filename = toUtf8String(filename);		

				System.out.println("2:" + filename);
				
				response.setContentType("application/x-msdownload;charset=gbk");
				response.setHeader("Content-disposition", "attachment; "
						+ "filename=" + filename);

				filename = Utf8URLdecode(filename);
				
				System.out.println("3:" + filename);
				System.out.println(config.getServletContext().getRealPath(
						"/upload/" + filename));
				bis = new BufferedInputStream(new FileInputStream(config
						.getServletContext().getRealPath("/upload/")
						+ "/" + filename));
				bos = new BufferedOutputStream(response.getOutputStream());
				byte[] buff = new byte[2048];
				int bytesRead;
				while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
					bos.write(buff, 0, bytesRead);
				}
			} catch (Exception e) {
				//e.printStackTrace();
			} finally {
				if (bis != null)
					bis.close();
				if (bos != null)
					bos.close();
			}

		%>