javax.servlet.http.HttpServletResponse;
/**
* Servlet的生命周期
* @author jukey
*
*/
public class TestLifeCycleServlet extends HttpServlet {
// 处理请求
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doGet");
}
// 实例化
// 注意:构造方法不能有返回值类型,连void也不行(否则就变成普通方法了)
public TestLifeCycleServlet() {
System.out.println("constructed");
}
// 退出服务
public void destroy() {
System.out.println("destory");
}
// 初始化
public void init() throws ServletException {
System.out.println("init");
}
}
/*
测试结果(在tomcat服务器控制台窗口):
constructed
init
doGet
*/
------------------------------------------------------------------------------------------------------------------------------------
4.读取指定的参数
①Threeparams.htm
②ThreeParams.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 读取指定的参数
* @author jukey
*
*/
public class ThreeParams extends HttpServlet {
// 参数在传递过程中,在URL地址栏中显示出来
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312");
PrintWriter pw = response.getWriter();
pw.println(request.getParameter("param1"));
pw.println("
");
pw.println(request.getParameter("param2"));
pw.println("
");
pw.println(request.getParameter("param3"));
pw.println("
");
}
// 参数在传递过程中,在UR