了解其中的一些字符设置，PrintWriter输出等。。

form.html:

<!DOCTYPE html>
<html>
<head>
  <title>宠物类型大调查</title>
  <meta http-equiv="content-type" content="text/html ;charset=UTF-8">
</head>
<body>
  <form method="post" action="pet" >
   姓名:<input type="text" name="user" value=""><br>
   邮件：<input type="text" name="email" value=""><br>
   你喜爱的宠物代表： <br>
   <select name="type" size="6" multiple="true">
   <option value="猫">猫</option>
   <option value="狗">狗</option>
   <option value="鱼">鱼</option>
   <option value="鸟">鸟</option>
   </select>
   <br>
   <input type="submit" value="send" />

</form>
</body>
</html>

Pet.java:

package cc.openhome;

import java.io.IOException;
import java.io.*;
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 Pet
 */
@WebServlet("/pet")
public class Pet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Pet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>感谢填写</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("联系人：<a herf='mailto:"
                + request.getParameter("email") + "'>"
                + request.getParameter("user") + "</a>");
        out.println("<br>喜爱的宠物类型");
        for (String type : request.getParameterValues("type")) {
            out.println("<li>" + type + "</li>");
        }
        out.println("<ul>");
        out.println("</ul>");
        out.println("</body>");
        out.println("</html>");
        out.close();
    }

}

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