2-6自由编程

来源：2-6 自由编程

RobinZang

2019-09-26 23:20:26

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>加法计算器</title>
</head>
<body>
<form action="/JspPracCode/direct/check">
		<input name="num" placeholder="请输入100以内的数字"/>
		<input type="submit" value="求累加和"><br/>
</form>
</body>
</html>

package com.imooc.servlet.driect;

import java.io.IOException;
import java.io.PrintWriter;

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 CheckLoginServlet
 */
@WebServlet("/direct/check")
public class CheckLoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CheckLoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf8");
		response.setContentType("text/html;charset=utf-8");
		// 接收请求发来的参数
		String num = request.getParameter("num");
		int numb = Integer.parseInt(num);
		int sum = 0;
		for(int i = 1; i<=numb; i++) {
			sum = sum + i;
		}
		request.setAttribute("sum",sum);
		//实现了请求转发的功能
		request.getRequestDispatcher("/direct/index").forward(request,response);
	}

}

package com.imooc.servlet.driect;

import java.io.IOException;
import java.io.PrintWriter;

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 IndexServlet
 */
@WebServlet("/direct/index")
public class IndexServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public IndexServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int sum = (int)request.getAttribute("sum");
		String html = "<p>累加和为：" + sum + "</p>";
		PrintWriter out = response.getWriter();
		out.println(html);// 将html发送回浏览器
	}

}

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