Servlet乘法表学习笔记

一、控制台实现乘法表

package com.shanrengo;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



public class MultiTableServlet extends HttpServlet {



	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		for (int i = 1; i <= 9; i++) {

			for (int j = 1; j <= i; j++) {

				System.out.print(j + "*" + i + "=" + j*i + "\t");

			}

			System.out.println();

		}

		

	}



	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

	}



}

 

二、输出浏览器代码修改

public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		PrintWriter out = response.getWriter();

		for (int i = 1; i <= 9; i++) {

			for (int j = 1; j <= i; j++) {

				out.print(j + "*" + i + "=" + j*i + "\t");

			}

			out.println();

		}

		

	}

 

三、让用户提交一个数字

1.新建一个用户页面input.html

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

   请输入一个数字:<input type="text" name="number"/>

   <input type="submit" value="打印"/>

 </form>

　　

action可填写相对路劲，也可以填写绝对路径

相对路径：将URL最后地址换成相对地址，例如action填写MultiTableServlet就可以了。

如果input.html页面和MultiTableServlet不是同一个目录的，则会出现404错误，如果是在上一个目录就要再action填写../MultiTableServlet

绝对路径：action填写，/testServlet/MutiTableServlet或者http://localhost:8080/testServlet/MutiTableServlet

 

2.修改Servlet

package com.shanrengo;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



public class MultiTableServlet extends HttpServlet {



	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		String numberStr = request.getParameter("number");

		int number = 0;

		try {

			number = Integer.parseInt(numberStr);

		} catch (NumberFormatException e) {

			// TODO Auto-generated catch block

			//e.printStackTrace();

			throw new RuntimeException("不是数字");

		}

		PrintWriter out = response.getWriter();

		for (int i = 1; i <= number; i++) {

			for (int j = 1; j <= i; j++) {

				out.print(j + "*" + i + "=" + j*i + "\t");

			}

			out.println();

		}

		

	}



	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

	}



}

　　

项目附件：http://pan.baidu.com/s/1pJugL31

 

注：我是初学者，发表博客只是学习笔记，欢迎探讨指教，希望可以结实良师益友。