• 父pom.xml

    <modules>
        <module>servlet-01</module>
    </modules>

• 子pom.xml

  <parent>
    <artifactId>javaweb-001-servlet</artifactId>
    <groupId>com.zzqsmile</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <modelVersion>4.0.0</modelVersion>

  <artifactId>servlet-01</artifactId>
  <packaging>war</packaging>

......
    <servlet>
        <servlet-name>hello1</servlet-name>
        <servlet-class>com.zzqsile.servlet.HelloServlet</servlet-class>
    </servlet>

    <!--    servlet请求路径-->
    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello1</url-pattern>
    </servlet-mapping>
......

package com.zzqsile.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {

    //由于get/post只是请求实现的不同方式，可以相互调用，业务逻辑都一样

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();  //响应流
        writer.println("hello servlet ");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

配置Tomcat

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启动

http://localhost:8082/s1/

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访问http://localhost:8082/s1/hello1

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Mapping问题

一个servlet可以配置多个路径

<!--    servlet请求路径-->
    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello1</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello2</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello3</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello4</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>hello1 </servlet-name>
        <url-pattern>/hello/*</url-pattern>
    </servlet-mapping>

• 可以自定义后缀实现请求映射

注意点： *前面不能加项目映射的路径

<servlet-mapping>
        <servlet-name>hello1</servlet-name>
        <url-pattern>*.zzqsmile</url-pattern>
    </servlet-mapping>

• 优先级

固有的路径优先级最高

<servlet-mapping>
        <servlet-name>error</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>