JSP中Servlet获取表单数据示例(doGet()和doPost()共用接口)

2019-11-17 04:10:03

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仔细钻研下面两个代码绝对让你受益匪浅

1.jsp页（form表单）：

<%--
    Document   : index
    Created on : 2009-10-9, 10:37:30
    Author     : lucifer
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

2.Servlet(名字是NewServlet)

/*
    Document   : NewServlet
    Created on : 2009-10-9, 10:37:30
    Author     : lucifer
*/

import java.io.IOException;
import java.io.PRintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

public class NewServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException {
         Vector rows;
         String requestdata = "";
        res.setContentType("text/html;charset=UTF-8");
        PrintWriter out = res.getWriter();
        try {

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet NewServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet NewServlet at " + req.getContextPath () + "</h1>");

            rows = getRequestParametersData(req);
            for(int i = 0;i < rows.size();i++){
                 Vector cols = (Vector)rows.elementAt(i);
                 for(int j = 0;j <cols.size();j++){
                      requestdata += cols.elementAt(j);
                 }
                 requestdata += "<br>";
            }
            out.println(requestdata);
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }

    private Vector getRequestParametersData(HttpServletRequest req){
         Vector rows = new Vector();
         for(Enumeration e = req.getParameterNames();e.hasMoreElements();){
              String name = (String)e.nextElement();
              String[] values = req.getParameterValues(name);
              Vector cols = new Vector();
              cols.addElement(name);
              String value = "";
              for(int i = 0;i < values.length;i++){
                   value += "{" + values[i] + "}";
              }
              cols.addElement(value);
              rows.addElement(cols);
         }
         return rows;

}

    //注意他们共用一个接口
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException {
        processRequest(req, res);
    }

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

    @Override
    public String getServletInfo() {
        return "～～～";
    }

}

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