我的第一个Servlet

第一个sevlet工程

 

【新建】：

在项目右键新建sevlet，点next以后将出现：

which method stubs  would you like to create?

这时候我们为了更好了解sevlet，除了info，service和config都选上

于是代码就变成了这样:

public class FirstServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FirstServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init(ServletConfig config) throws ServletException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Servlet#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doPut(HttpServletRequest, HttpServletResponse)
	 */
	protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doDelete(HttpServletRequest, HttpServletResponse)
	 */
	protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doHead(HttpServletRequest, HttpServletResponse)
	 */
	protected void doHead(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doOptions(HttpServletRequest, HttpServletResponse)
	 */
	protected void doOptions(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doTrace(HttpServletRequest, HttpServletResponse)
	 */
	protected void doTrace(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}

  在这里面有几个需要我们重点注意：

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

 这两段方法是HTTP  get 和post请求

业务处理代码，可以理解为跟客户端沟通的关键。

创建好Sevlet类后，还需要对其进行配置。配置就是为了将创建好的Sevlet注册到Sevlet容器当中，方便容器对它的调用。

在Servlet3.0之前对其配置比较复杂，是需要在web.xml里面进行配置，所以你在新建工程的时候会有选项问你生不生成web.xml.默认是不生成的，因为我们现在可以用在代码头上加上这一段来解决这个问题

binggo：

@WebServlet("/FirstServlet")
public class FirstServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()

 @WebServlet("/FirstServlet")
就是这句话，是不是感觉so easy呢？