Servlet FristBoold-优快云博客

本文链接：https://blog.youkuaiyun.com/huanglei1989/article/details/51756549

在公司利用框架小写页面，都不知到servlet到底是啥玩意，探索一发。

1、环境准备

JDK\Eclipse(J2EE版本）\Tomcat

2、工程搭建

File-->New-->Project-->Web-->Dynamic Web Project

3、编写代码

1）Jsp

在WebContent文件下创建Test.jsp文件。

<div style="text-align: left;"><span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size:14px;"><%@ page language="java" contentType="text/html; charset=ISO-8859-1"</span></span></div><span style="font-size:14px;">    pageEncoding="ISO-8859-1"%>
</span><div style="text-align: left;"><span style="font-family: Arial, Helvetica, sans-serif;"><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"></span></div>    <%@ page import="com.huang.MyServlet" %>
<html>
<head>
<div style="text-align: left;"><span style="font-family: Arial, Helvetica, sans-serif;"><title>Insert title here</title></span></div><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<%
MyServlet test = new MyServlet();
<div style="text-align: left;"><span style="font-family: Arial, Helvetica, sans-serif;">	  <p>input your name:<input type="text" name="name"></p></span></div>System.out.printf(test.getInfo());
%>

	<form action="MyServlet" method="post">
	  <p><input type="submit" value="submit"/></p>
	</form>

</body>
<div style="text-align: left;"><span style="font-family: Arial, Helvetica, sans-serif;"></html></span></div>

2）Java

在工程的Java Resource/src下创建Java文件

<span style="font-size:14px;">package com.huang;

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;
//@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = -2522004702960978872L;

	
    protected void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException
    {
    	req.setCharacterEncoding("UTF-8");
    	resp.setCharacterEncoding("UTF-8");
    	
    	String name = req.getParameter("name");
    	
    	PrintWriter writer = resp.getWriter();
    	
    	if(name != null)
    	{
    		writer.write("hello " + name + "!");
    	}
    	
    	writer.flush();
    	writer.close();
    }
    
    public String getInfo()
    {
    	return "Hello World";
    }
}</span>

4、配置

1）如果启用了java文件中的@WebServlet("/MyServlet")，则不需要在web.xml文件中配置servlet项。一定要注意注释中的页面访问此路径时会调用到本servlet。

2）如果没有启用Java中的webservlet注释，则需要在web.xml文件中的servlet配置项。

<servlet>
    <servlet-name>MyServlet</servlet-name>
    <servlet-class>com.huang.MyServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>MyServlet</servlet-name>
    <url-pattern>/MyServlet</url-pattern>
  </servlet-mapping>