java期末大作业 基于Java+JSP实现的在线音乐管理系统源码(含SQL数据库文件)

package Pluto; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.security.MessageDigest; import javax.activation.FileTypeMap; public class function { public function() { } public static boolean isInvalid(String value) { return (value == null || value.length() == 0); } public static String page(int page_num, int cur_page, int per_group, String base_url) { String page_val = ""; int /* group_num, */cur_group, from, to, a, next, prev; base_url += (base_url.indexOf('?') != -1) ? '&' : '?'; if (page_num < 1) { return page_val; } else if (page_num == 1) { return page_val = "1"; } if ((cur_page - 1) % (per_group - 1) == 0) { // ��������һҳ cur_group = (cur_page - 1) / (per_group - 1) + 1; } else { cur_group = (int) Math.ceil((double) (cur_page - 1) / (per_group - 1)); } from = (cur_group - 1) * (per_group - 1) + 1; from = cur_group <= 1 ? 1 : from; to = from + per_group; to = to > page_num ? page_num + 1 : to; for (a = from; a < to; a++) { if (a != cur_page) { page_val += "<a href =javascript:dopage('" + base_url + "page=" + String.valueOf(a) + "');>" + String.valueOf(a) + "</a>"; } else { page_val += "<span class=\"current\">" + String.valueOf(a) + "</span>"; } } next = cur_page + 1; prev = cur_page - 1; if (cur_page != page_num) { page_val += "<a href =javascript:dopage('" + base_url + "page=" + String.valueOf(next) + "');> Next </a>"; page_val += "<a href =javascript:dopage('" + base_url + "page=" + String.valueOf(page_num) + "');> >> </a>"; } if (cur_page != 1) { page_val = "<a href =javascript:dopage('" + base_url + "page=" + prev + "');> Prev </a>" + page_val; page_val = "<a href =javascript:dopage('" + base_url + "page=1');> << </a>" + page_val; // ��ҳ } return page_val; } public static String page(int page_num, int cur_page, int per_group, String base_url,boolean noAJAX) { String page_val = ""; int /* group_num, */cur_group, from, to, a, next, prev; base_url += (base_url.indexOf('?') != -1) ? '&' : '?'; if (page_num < 1) { return page_val; } else if (page_num == 1) { return page_val = "1"; } if ((cur_page - 1) % (per_group - 1) == 0) { // ��������һҳ cur_group = (cur_page - 1) / (per_group - 1) + 1; } else { cur_group = (int) Math.ceil((double) (cur_page - 1) / (per_group - 1)); } from = (cur_group - 1) * (per_group - 1) + 1; from = cur_group <= 1 ? 1 : from; to = from + per_group; to = to > page_num ? page_num + 1 : to; for (a = from; a < to; a++) { if (a != cur_page) { page_val += "<a href =" + base_url + "page=" + String.valueOf(a) + ">" + String.valueOf(a) + "</a>"; } else { page_val += "<span class=\"current\">" + String.valueOf(a) + "</span>"; } } next = cur_page + 1; prev = cur_page - 1; if (cur_page != page_num) { page_val += "<a href =" + base_url + "page=" + String.valueOf(next) + "> Next </a>"; page_val += "<a href =" + base_url + "page=" + String.valueOf(page_num) + "> >> </a>"; } if (cur_page != 1) { page_val = "<a href =" + base_url + "page=" + prev + "> Prev </a>" + page_val; page_val = "<a href =" + base_url + "page=1> << </a>" + page_val; } return page_val; } // MD5���� private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; public static String byteArrayToHexString(byte[] b) { StringBuffer resultSb = new StringBuffer(); for (int i = 0; i < b.length; i++) { resultSb.append(byteToHexString(b[i])); } return resultSb.toString(); } private static String byteToHexString(byte b) { int n = b; if (n < 0) n = 256 + n; int d1 = n / 16; int d2 = n % 16; return hexDigits[d1] + hexDigits[d2]; } public static String MD5Encode(String origin) { String resultString = null; try { resultString = new String(origin); MessageDigest md = MessageDigest.getInstance("MD5"); resultString = byteArrayToHexString(md.digest(resultString .getBytes())); } catch (Exception ex) { } return resultString; } public static String PlutoJump(String errorStr, String jumpTo) { String str = null; try { str = "<script language='javascript'>alert('" + errorStr + "');location.href='" + jumpTo + "';</script>"; } catch (Exception e) { str = "<script language='javascript'>alert('" + errorStr + "');location.href='" + jumpTo + "';</script>"; } return str; } public static int strToInt(String str) { int a = 0; try { a = Integer.parseInt(str); } catch (NumberFormatException e) { a = 0; } return a; } public static String fileType(File file) { FileTypeMap map = FileTypeMap.getDefaultFileTypeMap(); return map.getContentType(file); } /** * ��ȡԴ�ļ����� * * @param filename * String �ļ�·�� * @throws IOException * @return byte[] �ļ����� */ public static byte[] readFile(String filename) throws IOException { File file = new File(filename); if (filename == null || filename.equals("")) { throw new NullPointerException("��Ч���ļ�·��"); } long len = file.length(); byte[] bytes = new byte[(int) len]; BufferedInputStream bufferedInputStream = new BufferedInputStream( new FileInputStream(file)); int r = bufferedInputStream.read(bytes); if (r != len) throw new IOException("��ȡ�ļ�����ȷ"); bufferedInputStream.close(); return bytes; } }