什么是servlet？

来源：互联网发布：mcmc算法原理编辑：程序博客网时间：2024/06/06 20:06

1其实spring mvc里用到过。

在web.xml中，配置如下，DispatcherServlet就是一个servlet。

<servlet>
<servlet-name>Dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

2servlet究竟是什么呢？

参考链接：http://www.cnblogs.com/mengdd/archive/2013/06/12/3132612.html

2.1HelloWorldServlet.java类

package com.shengqishiwind.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloWorldServlet extends HttpServlet
{
@SuppressWarnings("deprecation")
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
// 首先将访问修饰符覆写为public

// 设置内容类型
resp.setContentType("text/html");

PrintWriter out = resp.getWriter();

out.println("<html><head><title>Hello World Sample</title></head>");
out.println("<body><h1>Hello World Title<h1><h2>" +new Date().toLocaleString() + "</h2></body></html>");
out.flush();

}

}

2.2web.xml配置

HelloWorldServlet.java类在web.xml中的配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>HelloWorldServletName</servlet-name>
<servlet-class>com.shengqishiwind.servlet.HelloWorldServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldServletName</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
</web-app>

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