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知乎专栏

第 100 章 Servlet

目录

100.1. Example
100.2. Session
100.3. HttpServletRequest
100.4. Filter
100.4.1. web.xml
100.4.2. Filter 类
100.5. Listener
100.5.1. web.xml
100.5.2. NewsListener 类
100.5.3. NewsTask 类
100.5.4. JSP 中心显示
100.6. JSP
100.6.1. 注释
100.6.2. pageContext
100.6.3. request
100.6.4.
100.6.5. cookie
100.6.6. session
100.6.7. page
100.6.8. trimDirectiveWhitespaces
100.6.9. include
100.6.10. jsp
100.6.11. error-page
100.6.12. JSP 编程
100.6.13. FAQ
100.7. JSTL(JavaServer Pages Standard Tag Library)
100.7.1. c:set
100.7.2. c:out
100.7.3. c:url
100.7.4. c:redirect
100.7.5. c:import
100.7.6. c:if
100.7.7. c:choose
100.7.8. c:forEach
100.7.9. empty 判断是否为空
100.7.10. JSTL fmt Tag setBundle Example
100.8. WebSocket
100.8.1. Server
100.8.2. Client

100.1. Example

package cn.netkiller.helloworld;

import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init(ServletConfig config) throws ServletException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		// 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()).append("<br></br> Helloworld");
	}

	/**
	 * @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);
	}

}