本文目录一览：
jsp程序代码
%@ page language="java" import="java.util.*" errorPage="error.jsp" pageEncoding="UTF-8"%
% request.setCharacterEncoding("GBK");%
html
head
title动作处理页面/title
/head
body background="C:tpyy.JPG"
font color=yellow
centerbrh2
jsp:useBean id="loginbean" class="com.login.LoginBean"/jsp:useBean //使用jsp:useBean标签调用LoginBean.java，class指明JavaBean位置
jsp:setProperty name="loginbean" property="*" ///设置LoginBean的属性值
%out.println("用户号为："+loginbean.getUserid()+"brbr"); 输出loginbean里面getUserid的值
if (loginbean.getUserid()==null){ //如果用户名为空
throw new Exception("尊敬的用户：系统登录页面中的用户名不能为空,请输入用户号！");
}
if (loginbean.getPsw()==null){ //如果密码为空
throw new Exception("尊敬的用户：系统登录页面中的密码不能为空,请输入密码！");
}
if (loginbean.getPsw().equalsIgnoreCase("neusoft")) //如果JavaBean的密码和输入密码相同
{
String puserid = request.getParameter("userid"); //获得此用户ID
Cookie cookies[] = request.getCookies();
//如果是上一步提交过来的，则更新Cookie的值
if(puserid != null) {
Cookie c = new Cookie("userid", puserid);
c.setMaxAge(60*60*24*30); //Cookie的有效期为1个月setMaxAge()是Cookie 的一个方法
器单位为秒
60*60*24*30等与30天*24小时*60分*60秒==结果就为1个月的秒数
response.addCookie(c);
}
session.setAttribute("login","ok");
session.setMaxInactiveInterval(-1);
%
jsp:forward page="success.jsp" / //跳转至success.jsp
%
}
else { //如果密码不正确则执行
out.println("对不起，密码输入错误！您此次系统登陆失败！请重新输入密码！brbr");
out.println("A href=login.jsp返回/Abr");
}
%
h2
br
hr
/font
/body
/html
答题完毕
解释JSP代码，越详细越好
%
Condb con=new Condb(); //建立数据库连接
int num=0; 定义计数变量 初始化为0
String sql="select * from tb_Result where Result='"+1+"'"; 数据库查询命令
ResultSet rs=con.executeQuery(sql); 执行数据库查询命令
while(rs.next()){ 判断是否是否是记录集最后一条同时移动数据库记录至下一条
num++; 计数变量自加1
%
tr
td width="37" height="22" align="center"%=num%/td
td height="22" align="left"a href="Rparticular.jsp?temp=%=rs.getString(2)%" 得到数据库第三个字段的值作为temp参数的值
%String str=rs.getString(2);out.println(str);% 输出数据库第三个字段的值
/a/td
td height="22" align="center"%=rs.getDate(8)%/td
td height="22" align="center"%=rs.getString(9)%/td
/tr
%
}
con.close(); 关闭数据库连接
%
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
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;
}
}