jsp文件在tomcat里运行找不到自定义包了，该怎么定义才对
作者:胖虎
这个包没写错吧 package Md5; public class Md5 { /** * 将密码转换成MD5加密后的字符串形式. * @param password 原始密码 * @return 32位字符串 */ public static String getMD5(String password) { byte[] source = password.getBytes(); String s = null; char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; try { java.security.MessageDigest md = java.security.MessageDigest .getInstance("MD5"); md.update(source); byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数， // 用字节表示就是 16 个字节 char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话，使用两个字符， // 所以表示成 16 进制需要 32 个字符 int k = 0; // 表示转换结果中对应的字符位置 for (int i = 0; i < 16; i++) { // 从第一个字节开始，对 MD5 的每一个字节 // 转换成 16 进制字符的转换 byte byte0 = tmp; // 取第 i 个字节 str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换, // >>> 为逻辑右移，将符号位一起右移 str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换 } s = new String(str); // 换后的结果转换为字符串 } catch (Exception e) { e.printStackTrace(); } return s; } } 然后，不知道在tomcat里边改怎么放 jsp里边才能找到我写的这个包 这个是jsp <%@ page language="java" import="java.util.*" import = "Md5.*" import="java.sql.*" import = "java.util.Date" pageEncoding="utf-8"%> <% //String path = request.getContextPath(); //String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String emsg = "ertyuio"; java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Date currentTime = new java.util.Date();//得到当前系统时间 String t = formatter.format(currentTime); //将日期时间格式化 Class.forName("com.mysql.jdbc.Driver"); Connection conn = DriverManager.getConnection("xxXXXXXXXXXXXXXXX"); Statement stat = conn.createStatement(); String id = request.getParameter("id"); String password = request.getParameter("password"); String password1; String ip = request.getRemoteAddr(); String sql = ""; //password1 = Md5.getMD5(password); int a ; int a1 = 0; int a2 = 0; int i = 0; int a3 = 0; %> <%=id +" "+password+" "+ip+" "+t+" " %> <% sql = "SELECT COUNT(id) FRoM users WHERE id = '"+id+"'" ; ResultSet rs = stat.executeQuery(sql); rs.next(); a = rs.getInt(1); %> <%="数据库中共有 "+a %> <% if(a == 0){ sql = "INSERT INTO users(id,password,creat_time,ip) VALUES(?,?,?,?)"; PreparedStatement ps = conn.prepareStatement(sql); if(id == null ) {a1 = 0;} else if(id.getBytes("UTF-8").length>30) {a1 = 1;} else if(password == null ) {a2 = 0;} else if( password.getBytes("UTF-8").length>900) {a2 = 1;} else if (id != null && password != null && ip != null){ password1 = Md5.getMD5(password); emsg = "1"; ps.setString(1,id); ps.setString(2,password1); ps.setString(3,t); ps.setString(4,ip); i = ps.executeUpdate(); } } else if (a == 1){a3 = 1;} else {a=0;} %> <%="md5加密后 "+password1+" " %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>注册系统 </title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <script type = "text/javascript"> function a() //得到文本内容 { id = document.log.id.value; password = document.log.password.value; password1 = document.log.password1.value; //alert(id +" "+password +" "+ password1 ); if( id == ""){ alert("请填写用户名 "); document.log.uid.focus(); } else if(password == ""){ alert("密码不能为空"); document.log.password.focus(); } else if(password1 != password){ alert("请检查密码是否一致"); document.log.password.focus(); } else log.submit(); } if(<%= i%> == "1"){ alert("成功注册"); } if(<%= a1%> == "1"){ alert("ID输入过长"); } if(<%= a2%> == "1"){ alert("留言输入过长"); } </script> <!-- 页面******************************************************************************************** --> <form name = "log" method = "post" > <%=emsg %> <%= "a3 = "+ a3 %> <table> <tr> <td> 用户名：</td><td><input type = "text" name = "id"> </td> </tr> <tr> <td> 设置密码：</td><td> <input type = "password" name = "password"> </td></tr> <tr> <td> 确认密码</td><td><input type = "password" name = "password1"></td></tr> <tr> <td align = "right"> </td><td align = "left"> <input type = "reset" > <input type = "button" value = "注册"; ></td></tr> </table> </form> </body> </html> 部分细节没完善和重复的先不理，因为不知道怎么用自定义包来md5加密，这个是主要问题提示classnofound什么的吗？ 还是其他的什么异常？
