Servlet
【摘要】
文章目录
文章目录
文章目录一、Servlet快速入门二、Servlet的生命周期三、servlet方法四、servlet体系结构五、servlet urlPattern配置六、XML配置方...
文章目录
一、Servlet快速入门
案例：
//servlet依赖坐标
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
package com.study.web;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
@WebServlet("/demo1")
public class ServletDemo1 implements Servlet {
@Override
public void init(ServletConfig servletConfig) throws ServletException {
System.out.println("Hello!");
}
@Override
public ServletConfig getServletConfig() {
return null;
}
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
}
@Override
public String getServletInfo() {
return null;
}
@Override
public void destroy() {
}
}
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在控制台会打印Hello!。
二、Servlet的生命周期
案例：
package com.study.web;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
@WebServlet("/demo2")
public class ServletDemo2 implements Servlet {
//第一次访问servlet的时候调用，该方法只调用一次。
@Override
public void init(ServletConfig servletConfig) throws ServletException {
System.out.println("init.......");
}
//每次访问Servlet时都会被调用
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
System.out.println("Hello Service");
}
//释放内存或容器关闭时调用，只调用一次
@Override
public void destroy() {
System.out.println("destroy....");
}
@Override
public String getServletInfo() {
return null;
}
@Override
public ServletConfig getServletConfig() {
return null;
}
}
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三、servlet方法
四、servlet体系结构
案例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="http://localhost:8080/demo3" method="post">
<input name="username" type="text"><input type="submit" value="提交">
</form>
</body>
</html>
package com.study.web;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/demo3")
public class ServletDemo3 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("doGet...");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("doPost...");
}
}
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五、servlet urlPattern配置
六、XML配置方式编写servlet
文章来源: blog.csdn.net，作者：不会压弯的小飞侠，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/qq_43514330/article/details/125235961
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