import java.io.IOException;
import java.io.PrintWriter;

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

public class HelloWorldServerlet extends HttpServlet{
               public void doGet(HttpServletRequest request , HttpServletResponse response)
                                                                                            //doGet方法进行web的请求和回应动作
                         throws ServletException,IOException{
  
                       PrintWriter out = response.getWriter();
                      out.println("132");  //输送到ie界面的内容
               }

}

然后再web.xml中进行配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
 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_2_5.xsd">
 
 <!-- 我的注释 这里的配置关系到能不能正常访问到servlet类的内容 -->
<servlet>
  <servlet-name>TestServlet</servlet-name>
  <servlet-class>com.bo.introduct.TestServlet</servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>TestServlet</servlet-name>
  <url-pattern>/hello/</url-pattern>
</servlet-mapping> 
 
 
 
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

然后再Tomcat中加载项目名字，启动tomcat，打开ie，地址栏中写入 http://127.0.0.1:8080/(项目全名)/检测是否能跳转到index界面，测试是否部署成功；此时界面出现index里面的内容，在继续补全地址，http://127.0.0.1:8080/(项目全名)/hello，则会跳转到新界面，显示输出为123；