为什么要配置web.xml

就是为自己创建的一个servlet项目设置一个URL。

配置如下

代码如下

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>Servlet01_response</servlet-name>
    <servlet-class>response.Servlet01_response</servlet-class>
  </servlet>
   <servlet-mapping>
     <servlet-name>Servlet01_response</servlet-name>
     <url-pattern>/org.cn</url-pattern>
   </servlet-mapping>
</web-app>

展示

代码如下：

package response;

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;
import java.io.PrintWriter;

@WebServlet("/Servlet01_response")
public class Servlet01_response extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");//解决乱码问题
        PrintWriter writer=response.getWriter();
        writer.write("好好学习，天天向上！");
    }
}

注意的是：
该代码的URL为：/Servlet01_response

使用原来的URL

使用自己配置的