黑猴子的家：JavaWeb 之 Servlet 实现自动配置

Eclipse中创建Servlet（web_servlet03）
实现自动配置
通过 web_servlet03 学习Eclipse 自动创建Servlet

1、New -> Other

2、Servlet -> Next

3、Class Name -> Finish

4、Finish

5、web.xml

web.xml 里面自动生成

<servlet>
    <description>完成注册请求处理</description>
    <display-name>RegistServlet</display-name>
    <servlet-name>RegistServlet</servlet-name>
    <servlet-class>com.alex.web.servlet.RegistServlet</servlet-class>
    <init-param>
        <param-name>filename</param-name>
        <param-value>d:/tmp/log.txt</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup></servlet>
<servlet-mapping>
    <servlet-name>RegistServlet</servlet-name>
    <url-pattern>/RegistServlet</url-pattern>
</servlet-mapping>

6、RegistServlet.java

package com.alex.web.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
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 RegistServlet
 */
public class RegistServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegistServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    /**
     * @see Servlet#init(ServletConfig)
     */
    public void init(ServletConfig config) throws ServletException {
        //在配置文件里面传递的参数，使用这种方式获取值
        String filename = config.getInitParameter("filename");
    }
    /**
     * @see Servlet#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }
    /**
     * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
     */
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        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);
    }
}