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。