Question

怎么不让java web中表单中的某一个数据重复提交

Answer 1

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package cn.com.form;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

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

import sun.misc.BASE64Encoder;
//产生表单
public class FormServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//产生随机数
TokenProcessor tp=TokenProcessor.getInstance();
String token=tp.generateToken();

request.getSession().setAttribute("token", token);
request.getRequestDispatcher("/form.jsp").forward(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}

}
class TokenProcessor//令牌
{