request，请求转发,前后页面共享一个request，RequestDispatcher.forward()是在服务器端运行

1.dologin.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

<%
    request.setCharacterEncoding("utf-8");
    String uname=request.getParameter("uname");
    String gender=request.getParameter("gender");
    out.print(uname);
    out.print(gender);
    String [] cns = request.getParameterValues("cn");
    String [] cks = request.getParameterValues("ck");
    
    if(cns!=null){
        for(String cn:cns){
            out.print(cn);
        }
    }else{
        request.getRequestDispatcher("NewFile1.jsp").forward(request, response);
    }
    
    if(cks!=null){
        for(String ck:cks){
            out.print(ck);
        }
    }else{
        request.getRequestDispatcher("NewFile1.jsp").forward(request, response);
    }
    
    
%>

2.NewFile.jsp  请求转发页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="dologin.jsp" method="post">
    用户名:<input name="uname">
    性别：<input type="radio" name="gender" value="男">男
    <input type="radio" name="gender" value="女">女
    <select name="cn" >
            <option value="赵钱">赵钱</option>
            <option value="孙李">孙李</option>
            <option value="周吴">周吴</option>
            <option value="郑王">郑王</option>
    </select>
    
    <input type="checkbox"  value="小明" name="ck">小明
    <input type="checkbox"  value="笑话" name="ck">笑话
    <input type="checkbox"  value="晓红" name="ck">晓红
    <input type="checkbox"  value="小白" name="ck">小白
    <input type="submit" value="登陆">
</form>
</body>
</html>

 

posted @ 2019-05-30 10:36  南山下的采药人  阅读(1746)  评论(0)  编辑  收藏  举报