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知乎专栏

第 50 章 Servlet

目录

50.1. Example
50.2. Session
50.3. HttpServletRequest
50.4. Filter
50.4.1. web.xml
50.4.2. Filter 类
50.5. Listener
50.5.1. web.xml
50.5.2. NewsListener 类
50.5.3. NewsTask 类
50.5.4. JSP 中心显示
50.6. JSP
50.6.1. 注释
50.6.2. pageContext
50.6.3. request
50.6.4.
50.6.5. cookie
50.6.6. session
50.6.7. page
50.6.8. trimDirectiveWhitespaces
50.6.9. include
50.6.10. jsp
50.6.11. error-page
50.6.12. JSP 编程
50.6.13. FAQ
50.7. JSTL(JavaServer Pages Standard Tag Library)
50.7.1. c:set
50.7.2. c:out
50.7.3. c:url
50.7.4. c:redirect
50.7.5. c:import
50.7.6. c:if
50.7.7. c:choose
50.7.8. c:forEach
50.7.9. empty 判断是否为空
50.7.10. JSTL fmt Tag setBundle Example
50.8. WebSocket
50.8.1. Server
50.8.2. Client

50.1. 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);
	}

}