关于JSP的一点疑问小结

来源：爱站网时间：2019-05-21编辑：网友分享

JSP

当我们写完编程之后会发现程序代码出现了一些小问题，但是自己却检查不出到底是哪里错了，因此而感到烦恼，那么我们现在一起去了解JSP的疑问小结，看看问题到底出在哪里。

当我们写完编程之后会发现程序代码出现了一些小问题，但是自己却检查不出到底是哪里错了，因此而感到烦恼，那么我们现在一起去了解JSP的疑问小结，看看问题到底出在哪里。
register.html部分:

复制代码代码如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>register.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="this is my page">

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>

<br>

<form action="register.jsp" method = "Post" name = "frm">

用户名:<input type = "text" name = "in_username"><br>

密码:<input type = "password" name = "in_password"><br>

<input type = "submit" name = "submit" value = "提交">

</form>

</body>

</html>

复制代码代码如下:

<%@ page language="java" import = java.util.* pageEncoding="ISO-8859-1"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'register.jsp' starting page</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">

<meta http-equiv = "content-type" content = "text/html;charset = gb2312">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

</head>

<body>

<br>

<%! boolean isnotlogin = false;%>

<%

String username = request.getParameter("username");

String password = request.getParameter("password");

if(username == null || password == null)

{

response.sendRedirect("error.jsp");

return;

}

%>

<jsp:useBean id="person" scope = "page" class = "mypack.register">

<jsp:setProperty name = "person" property = "username" param = "username"/>

<jsp:setProperty name = "person" property = "pwd" param = "password"/>

</jsp:useBean>

<%

isnotlogin = person.judge();

if(!isnotlogin)

{

response.sendRedirect("error.jsp");

return;

}

else

{

session.setAttribute("username", request.getParameter("username"));

%>

<jsp:forward page = "sbmt">

<jsp:param name = "username" value = "<%=username%>"/>

</jsp:forward>

<%

}

%>

</body>

</html>

复制代码代码如下:

package mypack;
public class register {
private String username = "";
private String pwd = "";
public void setUserName(String nm)
{
this.username = nm;
}
public String getUserName()
{
return this.username;
}
public void setPwd(String pd)
{
this.pwd = pd;
}
public String getPwd()
{
return this.pwd;
}
public boolean judge()
{
boolean temp = false;
if(username.equals("teacher") && pwd.equals("teacher"))
{
temp = true;
}
return temp;
}
}
sbmt.java(Servlet)部分:
package mypack;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class sbmt extends HttpServlet {
private static final long serialVersionUID = 1L;
public sbmt() {
super();
}
public void destroy() {
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(false);
if(session == null)
{
response.sendRedirect("error.jsp");
return;
}
String usernameone = (String)session.getAttribute("username");
String usernametwo = request.getParameter("username");
if(!usernameone.equals(usernametwo))
{
response.sendRedirect("error.jsp");
return;
}
response.setContentType("text/html;charset = GBK");
request.setAttribute("username", usernametwo);
if(usernametwo.equals("teacher"))
{
response.sendRedirect("teacher.jsp");
return;
}
else
{
response.sendRedirect("error.jsp");
return;
}
}
}
}

了解JSP的疑问小结之后，你看出问题所在了吗？如果你还想了解更多详细内容就请关注我们爱站技术频道吧。

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