Servlet开发技术，创建，以及Servlet的配置，web.xml的配置

直接上图，不废话！！！

第一：首先在Eclipse的包资源管理器中，单机鼠标右键，在弹出的快捷键菜单中选择“新建”/Servlet命令，在弹出的对话框中输入新建的Servlet所在的包和类名，然后单击下一步，

 

我选择默认，Next

 

依旧默认，Next

注意事项，在创建web的工程的时候需要注意的是如下图，选择上web.xml这个按钮，因为Servlet需要配置一下web.xml这个文件，web.xml在web-inf这个文件下面

上图第二个箭头前面有个方括号，勾选上就可以自动创建好web.xml这个文件了。

 

package com.ningmeng;

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;

/**
 * Servlet implementation class FirstServlet
 */
@WebServlet("/FirstServlet")
public class FirstServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FirstServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html");
        response.setCharacterEncoding("GBK");
        PrintWriter out=response.getWriter();
        out.print("<HTML>");
        out.println("<HEAD><TITLE>Servlet实例</TITLE></HEAD>");
        out.println("<BODY>");
        out.println("servlet实例");
        out.println(this.getClass());
        out.println("</BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

 

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>web02</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
      <!-- 声明Servlet对象 -->
      <servlet-name>FirstServlet</servlet-name>
      <!-- 上面一句指定Servlet对象的名称 -->
      <servlet-class>com.ningmeng.FirstServlet</servlet-class>
      <!-- 上面一句指定Servlet对象的完整位置，包含包名和类名 -->
  </servlet>
  <servlet-mapping>
      <!-- 映射Servlet -->
      <servlet-name>FirstServlet</servlet-name>
      <!--<servlet-name>与上面<Servlet>标签的<servlet-name>元素相对应，不可以随便起名  -->
      <url-pattern>/FirsetServlet</url-pattern>
      <!-- 上面一句话用于映射访问URL -->
  </servlet-mapping>
</web-app>

运行效果如下图所示