servlet HttpServletRequest

package web;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

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

@WebServlet(urlPatterns="/register")
public class RegisterServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

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

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		req.setCharacterEncoding("UTF-8");
		
		Enumeration<String> str1=req.getParameterNames();
		while(str1.hasMoreElements()){
			System.out.println(str1.nextElement());
		}
		
		String username=req.getParameter("username");
		String password=req.getParameter("password");
		String birthday=req.getParameter("birthday");
		//Stirng head_image=req.getParameter("head_image");
		String gener=req.getParameter("gener");
		String[]hobby=req.getParameterValues("hobby");
		String description=req.getParameter("description");
		
		System.out.println("用户名:"+username);
		System.out.println("密码:"+password);
		System.out.println("出生年:"+birthday);
		System.out.println("性别:"+gener);
		for(String str:hobby){
			System.out.println(str);
		}
		System.out.println("简介:"+description);
		
		Map<String, String[]> map=req.getParameterMap();
		Set set=map.keySet();
		Iterator it=set.iterator();
		while(it.hasNext()){
			Object[]obj=map.get(it.next());
			for(Object o:obj){
				System.out.println(o);
			}
		}
		for(Entry<String,String[]> en:map.entrySet()){
			for(Object o:en.getValue()){
				System.out.println(o);
			}
		}
		System.out.println(req.getContextPath());
	}
}