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package com.demo.loginDate;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.domain.GetDBConnection;
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import com.domain.Types;
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import com.domain.loginDateInfo;
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/**
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* Servlet implementation class QueryLoginDate
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*/
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@WebServlet("/querylogindate")
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public class QueryLoginDate extends HttpServlet {
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private static final long serialVersionUID = 1L;
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loginDateInfo logininfo = new loginDateInfo();
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/**
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* @see HttpServlet#HttpServlet()
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*/
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public QueryLoginDate() {
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super();
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// TODO Auto-generated constructor stub
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}
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/**
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* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
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*/
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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Connection con = GetDBConnection.connectDB("musicMySQL","root","12345");
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Statement sql;
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ResultSet rs;
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PreparedStatement preSql;
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String sqlstr="select username,loginDate from loginDateInfo where loginDateID = (select max(loginDateID) from loginDateInfo where username=?)"; //SQL语句
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try {
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sql=con.createStatement();
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preSql = con.prepareStatement(sqlstr);
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String username = request.getParameter("username");
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username = new String(username.getBytes("iso8859-1"),"UTF-8");
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preSql.setString(1, username);
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//int ok = preSql.executeUpdate();
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rs = preSql.executeQuery();
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rs.next();
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if(!rs.next()) {
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response.sendError(204, "insert failed");
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}else {
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OutputStream out = response.getOutputStream();
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//以什么编码打入
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out.write(rs.getString("username").getBytes());
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out.write(rs.getString("loginDate").getBytes());
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}
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logininfo.setUsername(rs.getString("username"));
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logininfo.setLoginDate(rs.getString("loginDate"));
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request.setAttribute("logininfo", logininfo);
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RequestDispatcher view = request.getRequestDispatcher("/showonelogin.jsp");
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view.forward(request, response);
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} catch(SQLException e) {
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request.setAttribute("logininfo", logininfo);
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RequestDispatcher view = request.getRequestDispatcher("/showonelogin.jsp");
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view.forward(request, response);
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}
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}
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}
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