jsp与Servlet跳转实例分析.docx
- 文档编号:5129441
- 上传时间:2023-05-08
- 格式:DOCX
- 页数:26
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jsp与Servlet跳转实例分析.docx
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jsp与Servlet跳转实例分析
页面:
Index.jsp
Input.jsp
Comfirm.jsp
Result.jsp
Error.jsp
服务:
InputServerlet
ConfirmServerlet
ResultServerlet
代码:
Index.jsp
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+":
//"+request.getServerName()+":
"+request.getServerPort()+path+"/";
%>
DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
--
-->
Confirm:
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+":
//"+request.getServerName()+":
"+request.getServerPort()+path+"/";
%>
DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
--
-->
--
.STYLE1{
color:
#00FF00;
font-weight:
bold;
font-size:
36px;
}
-->
<%
request.setCharacterEncoding("utf-8");
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
%>
Input:
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+":
//"+request.getServerName()+":
"+request.getServerPort()+path+"/";
%>
DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
--
-->
--
.STYLE1{
color:
#00FF00;
font-weight:
bold;
font-size:
36px;
}
-->
Result:
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+":
//"+request.getServerName()+":
"+request.getServerPort()+path+"/";
%>
DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
--
-->
<%
request.setCharacterEncoding("utf-8");
Stringmessage=(String)request.getAttribute("message");
%>
<%=message%>
Error:
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+":
//"+request.getServerName()+":
"+request.getServerPort()+path+"/";
%>
DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
--
-->
ERROR!
ConfrimServlet:
packagecn.edu.mastc.lianxi;
importjava.io.IOException;
importjavax.servlet.RequestDispatcher;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassConfirmServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=8610065041871481413L;
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
doPost(request,response);
}
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
//RequestDispatcherrd=request.getRequestDispatcher("/confirm.jsp");
//rd.forward(request,response);
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
response.sendRedirect("/lianxi/confirm.jsp?
username="+username+"&password="+password);
}
}
InputServlet
packagecn.edu.mastc.lianxi;
importjava.io.IOException;
importjavax.servlet.RequestDispatcher;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassInputServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=-3359403593063688441L;
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
RequestDispatcherrd=request.getRequestDispatcher("/input.jsp");
rd.forward(request,response);
}
}
ResultServlet
packagecn.edu.mastc.lianxi;
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.servlet.RequestDispatcher;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassResultServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=1098389127491075925L;
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
doPost(request,response);
}
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
request.setCharacterEncoding("utf-8");
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
Stringmessage="";
if(username.equals("china")&&password.equals("java")){
message="恭喜,您成功了!
";
}else{
message="遗憾,您登录失败!
";
}
request.setAttribute("message",message);
RequestDispatcherrd=request.getRequestDispatcher("/result.jsp");
rd.forward(request,response);
}
}
1.RequestDispatcher.forward()
是在服务器端起作用,当使用forward()时,Servletengine传递HTTP请求从当前的ServletorJSP到另外一个Servlet,JSP或普通HTML文件,也即你的form提交至a.jsp,在a.jsp用到了forward()重定向至b.jsp,此时form提交的所有信息在b.jsp都可以获得,参数自动传递.但forward()无法重定向至有frame的jsp文件,可以重定向至有frame的html文件,同时forward()无法在后面带参数传递,比如servlet?
name=frank,这样不行,可以程序内通过response.setAttribute("name",name)来传至下一个页面。
重定向后浏览器地址栏URL不变。
例:
在servlet中进行重定向
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException
{
response.setContentType("text/html;charset=gb2312");
ServletContextsc=getServletContext();
RequestDispatcherrd=null;
rd=sc.getRequestDispatcher("/index.jsp");//定向的页面
rd.forward(request,response);
}
通常在servlet中使用,不在
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- 关 键 词:
- jsp Servlet 跳转 实例 分析