用idea编写一个servlet程序

1.创建项目

创建maven项目并选择webapp

2.导入servlet依赖

3.编写servlet的java文件

在main文件夹下创建java文件夹并右键 Mark directory as 选择将java文件夹变为如图所示蓝色文件夹

4.编写HelloServlet

public class HelloServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
	@Override
	protected void doGet(HttpServletRequest request,
						 HttpServletResponse response) throws ServletException, IOException {
		//获取一个字符输出流,用于向浏览器发送数据
		PrintWriter out = response.getWriter();
		//因为默认编码是iso8859-1,所以输出中文数据会变成问号
		out.write( "Hello Servlet.."+new Date() );
	}

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

}

5.在web.xml中编写servlet映射

  day09
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
    HelloServlet
    com.tedu.HelloServlet
  
  
    HelloServlet
    /HelloServlet
  
  
    BServlet
    com.tedu.BServlet
  
  
    BServlet
    /BServlet
  

6.添加tomcat并编辑

右键如图所示选项

编辑

7.运行tomcat

会生成target文件

出现页面

输入路径