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Servlet生命周期测试代码2

2017-09-03 23:43 393 查看

package cn.ls.javaee;

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;
@WebServlet("/servlet1")
public class Servlet1 extends HttpServlet {
public Servlet1() {
System.out.println("Servlet1的构造方法");
}
@Override
public void init() throws ServletException {
System.out.println("servlet1初始化");
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
System.out.println("servlet1处理请求");
}
private void destory() {
System.out.println("Servlet1销毁");
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");
out.print("    This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");
out.print("    This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

}

注意load-on-startup启动即加载，正数值越小优先级越高

Servlet的实例数量，默认情况下，容器只会产生一个实例

此外了解SingleThreadModel接口即可

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标签： servlet

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