JavaWeb_servlet

MyEclipse 创建 Servlet

● 如果你发现你的 MyEclipse 新建像项目的时候没有 Servlet 选项，请先切换到 MyEclipse 的视图

● 新建 Servlet 项目（注意只能在项目下创建 servlet，就是说你得先创建一个 web 工程）



● 可以观察到


● 初始化

• 示例一
  
  
• 测试一：
  
• 示例二
  
  测试二：
  

以上操作完整源码：

package com.wyx.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class demo2 extends HttpServlet
{
	public void init(javax.servlet.ServletConfig config) throws ServletException 
	{		
		//从Servlet中获得初始化的参数值
		//String username = config.getInitParameter("username");
		//System.out.println(username);
		
		//获得所有的参数名
		Enumeration enums = config.getInitParameterNames();
		while(enums.hasMoreElements())
		{
			String name = (String) enums.nextElement();
			String value = config.getInitParameter(name);
			System.out.println(value);
		}			
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>servlet_demo</display-name>
   <servlet>
  	<!-- 设置servlet的名字 -->
  	<servlet-name>helloServlet</servlet-name>
  	<!-- 具体的servlet的类 -->
  	<servlet-class>com.wyx.servlet.demo1</servlet-class> 	
  	<load-on-startup>2</load-on-startup>
  </servlet>
  
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>demo2</servlet-name>
    <servlet-class>com.wyx.servlet.demo2</servlet-class>
    
    <init-param>
	    <param-name>username</param-name> 
	    <param-value>wyx</param-value>
    </init-param>
    
    <init-param>
    	<param-name>password</param-name>   
    	<param-value>123</param-value> 
    </init-param>
    <load-on-startup>1</load-on-startup>
    
  </servlet>

  <servlet-mapping>
    <servlet-name>demo2</servlet-name>
    <url-pattern>/servlet/demo2</url-pattern>
  </servlet-mapping>
</web-app>

工程文件下载

如有错误，欢迎指正！