java servlet 搭建简易的服务器

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

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

/**
 * Servlet implementation class Study
 */
@WebServlet("/Study")
public class Study extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Study() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Override
    public void init() throws ServletException {
    	// TODO Auto-generated method stub
    	super.init();
    	System.out.println("初始化……");
    }
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("服务……");
		System.out.println("你进行GET请求");
		//getParameter:获取指定参数名称的值
		String pn=request.getParameter("phone");
		if(pn!=null)
		{
			//解决Get请求中文乱码的问题
			byte[] arr=pn.getBytes("ISO8859-1");
			System.out.println("乱码解决："+new String(arr, "UTF-8"));
		}
		response.setCharacterEncoding("UTF-8");
		response.getWriter().println("不错，GET请求，没问题");
		
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		//doGet(request, response);
		System.out.println("你进行POST请求");
		//setCharacterEncoding:设置请求内容的编码格式
		request.setCharacterEncoding("UTF-8");
		String pn=request.getParameter("phone");
		//getRemoteAddr:获取远程的IP地址
		System.out.println(request.getRemoteAddr()+"：进行了POST请求：手机号："+pn);
		response.setCharacterEncoding("UTF-8");//设置响应内容的编码格式
		//getWriter:获取响应对象的输出字符流对象，用于消息返回
		PrintWriter pw=response.getWriter();
		pw.println("小伙子，恭喜你，请求成功");//写出
		pw.flush();//刷新
		pw.close();//关闭
		
	}
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		super.destroy();
		System.out.println("销毁……");
	}

}