Tomcat 篇

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请求处理

在java中创建class
java/web/TestServlet.class

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package web;

...

public class TestServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("get");
  }

  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("post");
  }
}

web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>test</servlet-name>
        <servlet-class>web.TestServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>test</servlet-name>
        <url-pattern>/test</url-pattern>
    </servlet-mapping>
</web-app>

访问 http://localhost:8080/test

通过注解方式

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@WebServlet(urlPatterns = "/user", name = "user", initParams = {
  @WebInitParam(name = "name", value = "wangyu")
})
public class UserServlet extends HttpServlet {
  @Override
  public void init(ServletConfig config) throws ServletException {
    System.out.println(config.getInitParameter("name"));
  }

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("get");
  }
}

初始化配置

web.xml

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<!-- 全局配置 -->
<context-param>
    <param-name>age</param-name>
    <param-value>21</param-value>
</context-param>
<servlet>
    <servlet-name>test</servlet-name>
    <servlet-class>web.TestServlet</servlet-class>
    <!-- 局部配置 -->
    <init-param>
        <param-name>name</param-name>
        <param-value>layouwen</param-value>
    </init-param>
</servlet>

常见配置

修改端口号

修改 port 的值即可

conf/server.xml

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<Connector port="9999" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />

JSP内置对象