searchservlet.java

一个web应用中找回密码的代码,这个代码实现了我们在web开发当中遇到的的密码丢失问题后如何解决这个问题的实现。

package searchpassword;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.mail.*;
import javax.activation.*;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.InternetAddress;

public class searchServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        String username = request.getParameter("username");
        String email = request.getParameter("email");
        String pass = null;
        try {
            Connection con = GetCon.get();
            PreparedStatement ps = con.prepareStatement(
                    "select password from UserTb1 where username=? and email=?");
            ps.setString(1, username);
            ps.setString(2,email);
            ResultSet rs = ps.executeQuery();
            boolean flag = rs.next();
            if(pass==null)
            {
                pass="密码为空";
            }
            else{
                pass = rs.getString(1);
            }
            if (flag) {
                try {
                    Properties prop = new Properties();
                    prop.put("mail.transport.protocol", "smtp"); //设置简单邮件协议
                    prop.put("mail.smtp.host", "127.0.0.1"); //设置服务器地址
                    prop.put("mail.smtp.port", "25"); //设置服务端口号
                    Session session = Session.getInstance(prop, null); //创建连接
                    Message msg = new MimeMessage(session);
                    msg.setFrom(new InternetAddress("[e-mail]"));
                    msg.setRecipients(Message.RecipientType.TO,
                                      InternetAddress.
                                      parse(email));
                    msg.setSentDate(new java.util.Date());
                    msg.setSubject("密码");
                    msg.setText("密码为："+pass);
                    Transport.send(msg);
                    msg.writeTo(System.out);
                    System.out.println("邮件已经成功发送");
                    RequestDispatcher res = request.getRequestDispatcher(
                            "mail.jsp");
                    res.forward(request, response);
                } catch (Exception ee) {
                    ee.printStackTrace();
                }

            }
            else {
                RequestDispatcher res = request.getRequestDispatcher("f.jsp");
                res.forward(request, response);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        out.close();
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}