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">
*本站禁止HTML标签噢*
*本站禁止HTML标签噢*
*本站禁止HTML标签噢* 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>
*本站禁止HTML标签噢*
<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 %>
*本站禁止HTML标签噢*
*本站禁止HTML标签噢* *本站禁止HTML标签噢* 用户名：</td> *本站禁止HTML标签噢* <input type = "text" name = "id"> </td> </tr>
*本站禁止HTML标签噢* *本站禁止HTML标签噢* 设置密码：</td> *本站禁止HTML标签噢* <input type = "password" name = "password"> </td></tr>
*本站禁止HTML标签噢* *本站禁止HTML标签噢* 确认密码</td> *本站禁止HTML标签噢* <input type = "password" name = "password1"></td></tr>
*本站禁止HTML标签噢* <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
