编写第一个Servlet程序

                                   Servlet的编写（两种方法）

一. 实现Servlet接口（service()方法）

二. 继承HttpServlet类（覆写doGet()和doPost()方法）

一. 实现Servlet接口（service()方法）

1 在src下新建一个HelloServlet.java文件

 

2 编写Servlet代码

package com.itheima.servlet;
import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class HelloServlet implements Servlet {

	@Override
	public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException, IOException {
		System.out.println("helloServlet...");
	}

	@Override
	public void destroy() {
	}

	@Override
	public ServletConfig getServletConfig() {
		return null;
	}

	@Override
	public String getServletInfo() {
		return null;
	}

	@Override
	public void init(ServletConfig arg0) throws ServletException {
	}

}

3 配置Servlet（web.xml）

  
      HelloServlet
      com.itheima.servlet.HelloServlet
  
  
  
      HelloServlet
      /HelloServlet
  

4 在地址栏输入http://localhost:8080/ServletTest01/HelloServlet

 

二. 继承HttpServlet类（覆写doGet()和doPost()方法）

1 在src下新建一个HiServlet.java文件

2 编写servlet代码（覆写doGet()和doPost()方法）

package com.itheima.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HiServlet extends HttpServlet{
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		super.doGet(req, resp);
		System.out.println("get...");
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		super.doPost(req, resp);
		System.out.println("post...");
	}	
}

3 配置Servlet（web.xml）

  
      HiServlet
      com.itheima.servlet.HiServlet
  
  
  
      HiServlet
      /HiServlet
  

4 在地址栏输入http://localhost:8080/ServletTest01/HiServlet