如何从servlet读取HashMap值并在jsp中显示
Shooping Servlet 购物套餐如何从servlet读取HashMap值并在jsp中显示,jsp,servlets,jstl,Jsp,Servlets,Jstl,Shooping Servlet 购物套餐 import java.io.IOException; import java.util.*; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import java
import java.io.IOException;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class ShoppingServlet
*/
@WebServlet("/ShoppingServlet")
public class ShoppingServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
final Map<Integer,String> products= new HashMap<Integer,String>();
products.put(1, "Motorola MotoX");
products.put(2, "Google Pixel2");
products.put(3, "Essential");
products.put(4, "Iphone 6");
request.setAttribute("product", products);
}
}
import java.io.IOException；
导入java.util.*；
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；
/**
*Servlet实现类ShoppingServlet
*/
@WebServlet（“/ShoppingServlet”）
公共类ShoppingServlet扩展了HttpServlet{
私有静态最终长serialVersionUID=1L；
受保护的void doGet（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException{
最终映射产品=新HashMap（）；
产品。put（1，“摩托罗拉MotoX”）；
products.put（2，“谷歌像素2”）；
产品。放置（3，“基本”）；
产品。put（4，“Iphone 6”）；
request.setAttribute（“产品”，产品）；
}
}
<%@ 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">
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Click on the products to add to the Cart.
<br/>
<c:forEach items="${product}" var="pro">
${pro.value};
<br/>
</c:forEach>
</body>
</html>
在此处插入标题
单击要添加到购物车的产品。
${pro.value}；
单击要添加到购物车中的产品但缺少值。您可以使用scriptlet在jsp页面上显示它
<%@ 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">
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Click on the products to add to the Cart.
<br/> <% for(String key: product.getKeys()){ out.println(product.get(key)+"<br/>"); } %>
</body>
</html>
在此处插入标题
单击要添加到购物车的产品。