Java 将动态数据传递到servlet中的哈希表
我创建了一个JSP页面,其中的单选按钮与当前月份的天数相同。代码是:Java 将动态数据传递到servlet中的哈希表,java,jsp,jakarta-ee,servlets,hashtable,Java,Jsp,Jakarta Ee,Servlets,Hashtable,我创建了一个JSP页面,其中的单选按钮与当前月份的天数相同。代码是: <%@page import="java.util.Calendar"%> <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "h
<%@page import="java.util.Calendar"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="TestAms" method="post">
<%
Calendar cal = Calendar.getInstance();
int md = cal.getActualMaximum(Calendar.DATE);
for(int i=0; i<md; i++){
%>
<input type="radio" name="<%= i%>" value="<%=i %>">
<%
}
%>
<input type="submit" value="SUBMIT">
</form>
</body>
</html>
在此处插入标题
现在我在servlet中获得单选按钮(JSP页面)的响应,并将它们存储在哈希表中,然后打印哈希表的元素,但我没有得到预期的结果。没有HashTable,它工作得很好,但我希望它能与HashTable一起工作。Servlet代码是:
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import java.util.Enumeration;
import java.util.Hashtable;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestAms extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
Calendar cal = Calendar.getInstance();
int md = cal.getActualMaximum(Calendar.DATE);
Hashtable ht = new Hashtable<>();
Enumeration sh = ht.keys();
for (int y=0; y<md; y++){
String s[] = new String[md+1];
s[md] = request.getParameter(Integer.toString(y));
if(s[md]!=null){
//out.println(s[md]);
ht.put(y, s[md]);
}
}
while(sh.hasMoreElements()){
System.out.println(sh.nextElement() );
}
}
}
import java.io.IOException;
导入java.io.PrintWriter;
导入java.util.Calendar;
导入java.util.Enumeration;
导入java.util.Hashtable;
导入javax.servlet.ServletException;
导入javax.servlet.annotation.WebServlet;
导入javax.servlet.http.HttpServlet;
导入javax.servlet.http.HttpServletRequest;
导入javax.servlet.http.HttpServletResponse;
公共类TestAms扩展了HttpServlet{
受保护的void doPost(HttpServletRequest请求、HttpServletResponse响应)引发ServletException、IOException{
PrintWriter out=response.getWriter();
Calendar cal=Calendar.getInstance();
int md=cal.getActualMaximum(日历日期);
Hashtable ht=新的Hashtable();
枚举sh=ht.keys();
对于(int y=0;y我在servlet中获取单选按钮(JSP页面)的响应,并将它们存储在哈希表中,然后打印哈希表的元素
请在下面找到将请求参数值存储在哈希表中的优化版本。我希望这能起作用:
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
Hashtable<String, String> days = new Hashtable<>();
Enumeration<String> names = request.getParameterNames();
while(names.hasMoreElements()){
String param = names.nextElement();
String value = request.getParameter(param);
days.put(param, value);
}
System.out.println(days);
}
受保护的void doPost(HttpServletRequest请求,
HttpServletResponse响应)引发ServletException,IOException{
哈希表天数=新哈希表();
枚举名称=request.getParameterNames();
while(names.hasMoreElements()){
String param=names.nextElement();
字符串值=request.getParameter(param);
天数。put(参数、值);
}
系统输出打印项次(天);
}
我得到servlet中单选按钮(JSP页面)的响应,并将它们存储在哈希表中,然后打印哈希表的元素
请在下面找到将请求参数值存储在哈希表中的优化版本。我希望这能起作用:
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
Hashtable<String, String> days = new Hashtable<>();
Enumeration<String> names = request.getParameterNames();
while(names.hasMoreElements()){
String param = names.nextElement();
String value = request.getParameter(param);
days.put(param, value);
}
System.out.println(days);
}
受保护的void doPost(HttpServletRequest请求,
HttpServletResponse响应)引发ServletException,IOException{
哈希表天数=新哈希表();
枚举名称=request.getParameterNames();
while(names.hasMoreElements()){
String param=names.nextElement();
字符串值=request.getParameter(param);
天数。put(参数、值);
}
系统输出打印项次(天);
}