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Servlet3.0生命周期,使用注解自动加载

2017-06-17 14:37 316 查看

Servlet生命周期:

0--调用构造方法
构造方法获得一个Servlet实例
1--调用初始化方法init();
整个生命周期中，init（)方法只被调用一次
2--调用service决定使用doGet()还是doPost()
3--调用销毁destroy()方法
关闭服务器时执行销毁方法。

1.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>Servlet生命周期</h1>
<hr>
<a href="TestServlet1">以Get方式请求TestServlet1</a>
</body>
</html>
2.TestServlet1.java
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 TestServlet1
*/
@WebServlet(name="TestServlet1",asyncSupported = true ,urlPatterns ="/TestServlet1",loadOnStartup=2)
public class TestServlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet1() {
System.out.println("TestServlet1构造方法被执行...");
}

/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
System.out.println("TestServlet1的初始执行方法");
}

/**
* @see Servlet#destroy()
*/
public void destroy() {
System.out.println("TestServlet1销毁方法被执行...");
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("TestServlet1doGet()方法被执行...");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.print("<h1>你好,我是TestServlet1</h1>");
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//让doPost()执行doGet()相同的操作
System.out.println("TestServlet1的doPost()方法被执行...");
doGet(request, response);
}

}

3.TestServlet2.java
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 TestServlet2
*/
@WebServlet(name="TestServlet2",asyncSupported = true,urlPatterns = "/TestServlet2", loadOnStartup=1)
public class TestServlet2 extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet2() {
System.out.println("TestServlet2构造方法被执行...");
}

/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
System.out.println("TestServlet2的初始执行方法");
}

/**
* @see Servlet#destroy()
*/
public void destroy() {
System.out.println("TestServlet2销毁方法被执行...");
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("TestServlet2doGet()方法被执行...");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.print("<h1>你好,我是TestServlet2</h1>");
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//让doPost()执行doGet()相同的操作
System.out.println("TestServlet2的doPost()方法被执行...");
doGet(request, response);
}

}

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标签： servlet

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