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Servlet乘法表学习笔记

2024-07-08 11:19:00   229人阅读

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="http://www.mamicode.com/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。

 


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