本文目录一览：
求大神写一下jsp的简单的注册界面代码。
1.需要一个jsp页面：
//login.jsp核心代码：
form action="${pageContext.request.contextPath}/servlet/UserServlet" method="post"
input type="text" name="loginname" /input type="password" name="password"/
input type="submit" value="登录"/
/form
2.需要一个servlet来验证登录信息
//UserServlet 核心代码
class UserServlet extends HttpServlet{
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
private void process(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
PrintWriter pw = response.getWriter();
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
String loginname = request.getParameter("loginname");
String password = request.getParameter("password");
//创建一个service来处理业务逻辑（包括查询数据库操作）
UserService service = new UserService();
boolean bool = service.validateUser(loginname,password);
if(!bool){
pw.println("用户名或密码错误");
}else{
pw.println("登录成功");
}
}
3.需要一个service处理业务逻辑（包括查询数据库操作）
//UserService 核心代码
public class UserService{
/**
*查询数据库验证用户是否存在，返回boolean
*/
public boolean validateUser(String loginname,String password){
boolean bool = false;
Connection conn = null;
PreparedStatement ps = null;
//这里以mysql为例
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
String sql = "select login_name,pass_word from t_user where login_name=? and pass_word=?";
ps = conn.prepareStatement(sql);
ps.setString(0, loginname);
ps.setString(1, password);
ResultSet rs = ps.executeQuery();
if(rs.next()){
bool = true;
}
} catch (Exception e) {
e.printStackTrace();
} finally{
try {
if(conn != null){
conn.close();
conn = null;
}
if(ps != null){
ps.close();
ps = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
return bool;
}
}
JSP编写一个登陆界面
1、首先准备Dreamweaver8软件，解压安装。如下图所示:这件点击安装程序，然后输入序列号就可以了。
2、在安装软件时候，我们可以看到是否关联【jsp文件】。
3、安装好了软件以后，我们打开Dreamweaver8软件。点击菜单上的【文件】——【新建】。
4、弹出【新建文档】——【动态页】——【jsp】——【创建】。
5、点击【拆分】，在【body】标签下面输入：% out.println("Hello World！"); %。
6、然后按快捷键【ctrl+s】保存jsp文件。保存类型jps;。
jsp登录代码
login.jsp
%@ page language="java" pageEncoding="utf-8"%
html
head
title登录/title
script language="javascript"
function checkform() {
if (form4.name.value.length==0){
alert("请输入正确的姓名！");
form4.name.focus();
return false;
}
if (form4.password.value.length==0){
alert("请输入正确的密码!");
form4.password.focus();
return false;
}
}
/script
style type="text/css"
!--
#Layer1 {
position:absolute;
left:16px;
top:442px;
width:276px;
height:239px;
z-index:1;
}
#Layer2 {
position:absolute;
left:29px;
top:305px;
width:181px;
height:137px;
z-index:2;
}
--
/style
/head
body
div id="Layer1" style="left: 16px; width: 369px;"
form id="form4" name="form4" method="post" action="loginControl.jsp"
table border="0" style="top: 443px; left: 17px; width: 240px; height: 240px;"
tr
td colspan="3" div align="center"strong用户登录/strong/div/td
/tr
tr
td div align="right"strong用户名:/strong/div/td
td colspan="1"input type="text" name="name" //td
/tr
tr
td div align="right"strong密 码:/strongstrong /strong/div/td
td colspan="1"input type="password" name="password" //td
/tr
tr
td height="37" colspan="3"
label
input type="submit" name="Submit" value="登录"onclick="javascript:return(checkform());" /
/label
input type="reset" name="reset" value="重填" /
/td
/tr
/table
/form
/div
div id="Layer2" img src=2.jpg width="120" height="120"//div
label/label
/body
/html
loginControl.jsp
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%
%@ include file="tdb.jsp"%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
style type="text/css"
!--
#Layer1 {
position:absolute;
left:9px;
top:363px;
width:218px;
height:133px;
z-index:1;
}
--
/style
head
titleMy JSP 'loginControl.jsp' starting page/title
/head
body
%
String name= request.getParameter("name");
String password= request.getParameter("password");
System.out.println("成功11111");
sql="SELECT * FROM tdb WHERE user_Name='"+name+"' AND user_Pwd='"+password+"'";
rs = smt.executeQuery(sql);
if(!rs.next())
{%
script type="text/javascript"
alert("用户名和密码不正确！！！");
window.location.href='index.jsp';
/script%
}
response.sendRedirect("main.jsp");
%
/body
/html
tdb.jsp
%
Class.forName("oracle.jdbc.OracleDriver");
java.sql.Connection con=null;
con=java.sql.DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:ABC","zhan","123");
java.sql.Statement smt=con.createStatement();
java.sql.ResultSet rs;
java.sql.PreparedStatement ps;
String sql;
%
编写用户注册于登录的JSP页面的全部程序代码
3个jsp文件，第一个是login.jsp,第二个是judge.jsp,第三个是afterLogin.jsp
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
%@ page import="java.util.*" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title登录页面/title
/head
body
form name="loginForm" method="post" action="judgeUser.jsp"
table
tr
td用户名:input type="text" name="userName" id="userName"/td
/tr
tr
td密码:input type="password" name="password" id="password"/td
/tr
tr
tdinput type="submit" value="登录" style="background-color:pink" input type="reset" value="重置" style="background-color:red"/td
/tr
/table
/form
/body
/html
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
%@ page import="java.util.*" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title身份验证/title
/head
body
%
request.setCharacterEncoding("GB18030");
String name = request.getParameter("userName");
String password = request.getParameter("password");
if(name.equals("abc") password.equals("123")) {
%
jsp:forward page="afterLogin.jsp"
jsp:param name="userName" value="%=name%"/
/jsp:forward
%
}
else {
%
jsp:forward page="login.jsp"/
%
}
%
/body
/html
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title登录成功/title
/head
body
%
request.setCharacterEncoding("GB18030");
String name = request.getParameter("userName");
out.println("欢迎你:" + name);
%
/body
/html
