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作者: 季嘉聊跨境 | 来源:发表于2017-02-28 00:03 被阅读0次

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package com.MarissaMan.Servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.MarissaMan.beans.ShoppingCart;

/**

Servlet implementation class AddToCartServlet
*/
@WebServlet("/addToCart")
public class AddToCartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 String bookName= request.getParameter("id");
 int price = Integer.parseInt(request.getParameter("price"));
 
 HttpSession session = request.getSession();
 ShoppingCart sCart = (ShoppingCart)session.getAttribute("sCart");
 
 if(sCart == null ){
     sCart = new ShoppingCart();
     session.setAttribute("sCart", sCart);
 }
 
 sCart.addToCart(bookName, price);
 
 StringBuilder result = new StringBuilder();
 result.append("{")
 .append("\"bookName\":\"" + bookName + "\"")
 .append(",")
 .append("\"totalBookNumber\":" + sCart.getTotalBookNumber())
 .append(",")
 .append("\"totalMoney\":" + sCart.getTotalMoney())
 .append("}");
 
 response.setContentType("text/javascript; charset=UTF-8");
 response.getWriter().print(result.toString());

}

<%@ 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>

$(function(){
    $("a").click(function(){
        var url = "${pageContext.request.contextPath }/"+this.href;
        var args = {"time":new Date()};
        console.log(url);
        $.getJson(url,args,function(data){
            $("#bookName").text(data.bookName);
            $("#totalBookNumber").text(data.totalBookNumber);
            $("#totalMoney").text(data.totalMoney);
        });
        return false;
        
    });
})

</script>
</head>
<body>

<span id="bookName"></span> 加入购物车，购物车有<span id="totalBookNumber"></span> 本，总价为
<span id="totalMoney"></span>
Java
<a href="addToCart">加入购物车</a>
<br><br>

Oracle
<a href="addToCart?id=Oracle&price=100">加入购物车</a>
<br><br>

Struts2
<a href="addToCart?id=Struts2&price=100">加入购物车</a>
<br><br>

</body>
</html>

package com.MarissaMan.Servlet;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

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 ValiateUserNameServlet
*/
@WebServlet("/valiateUserName")
public class ValiateUserNameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 List<String> userNames = Arrays.asList("userName");
 String userName = request.getParameter("userName");
 String result = null;
 if(userNames.contains(userName)){
     result = "<font color='red'>used</font>";
 } else {
     result = "<font color='green'>unused</font>";
 }
 
 response.setContentType("text/html; charset=UTF-8");
 response.setCharacterEncoding("UTF-8");
 response.getWriter().print(result);

}

<%@ 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=UTF-8">
<title>Insert title here</title>

                        if (val != "") {
                            var url = "${pageContext.request.contextPath }/valiateUserName";
                            var args = {
                                "username" : val,
                                "time" : new Date()
                            };

                            $.post(url, args, function(data) {
                                $("#message").html(data);
                            });
                        }
                    });
})

</script>
</head>
<body>

<form action="" method="post">

    UserName: <input type="text" name="username" /> <br>
    <div id="message"></div>
    <br> <input type="submit" value="Submit" />

</form>

</body>
</html>

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