package com.bit;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class QueryUserTemp extends HttpServlet {
private static final long serialVersionUID = -3953175627432572010L;
private static final int pageLevel = 1;
public void doGet(HttpServletRequest req, HttpServletResponse res) {
if (!VerifyUser.verify(req, res, pageLevel)) {
return;
}
String username = req.getParameter("username");
String queryType = req.getParameter("qType");
int pageNow = 1;
try {
String toPage = req.getParameter("toPage");
if (toPage != null) {
pageNow = Integer.parseInt(toPage);
}
} catch (Exception e) {
}
int grd = 0;
System.out.println();
String testString = req.getParameter("testString");
System.out.println(username + " username");
System.out.println(queryType + " queryType");
System.out.println(pageNow + " pageNow");
System.out.println(testString + " testString");
System.out.println();
PrintWriter pw = null;
UserBeanCl ubc = new UserBeanCl();
ArrayList<UserBean> al = new ArrayList<>();
res.setContentType("text/html;charset=utf-8");
try {
pw = res.getWriter();
pw.println("<html>");
pw.println("<head>");
pw.println("<link rel='stylesheet' type='text/css' href='css/theme.css'>");
pw.println("</head>");
pw.println("<body>");
pw.println("<img src=imgs/logo.png id='logo'><br>");
pw.println("<h1>Query User</h1>");
pw.println("<form action=queryusertemp method=post>");
pw.println(
"<label for='username'>username: <input type=text id='username' name=username></label><br><br><br>");
pw.println(
"<label for='fuzzy'>Fuzzy <input type=radio id='fuzzy' name=qType value=fuz checked></label>");
pw.println(
"<label for='precise'>Precise <input type=radio id='precise' name=qType value=pre></label><br>");
pw.println("<br><br><input type=submit value=Query><br><br>");
if (username != null && queryType != null) {
if (username.equals("")) {
try {
res.sendRedirect("err?operation=Query");
} catch (IOException e) {
e.printStackTrace();
}
} else {
String ugrd = (String) req.getSession(true).getAttribute("ugrd");
grd = Integer.parseInt(ugrd);
al = ubc.queryUserByName(username, queryType, pageNow);
if (al.size() == 0) {
pw.println("<h2><em>No Result.</em></h2>");
} else {
pw.println("<h2>Query Result:</h2>");
pw.println("<table border=1 id='table'>");
pw.println("<tr bgcolor='pink'><th>id</th><th>name</th>");
if (grd == 10) {
pw.println("<th>pwd</th>");
}
pw.println("<th>email</th><th>grade</th></tr>");
Iterator<UserBean> it = al.iterator();
while (it.hasNext()) {
UserBean ub = it.next();
pw.println("<tr>");
pw.println("<td>" + ub.getUserId() + "</td>");
pw.println("<td>" + ub.getUsername() + "</td>");
if (grd == 10) {
pw.println("<td>" + ub.getPasswd() + "</td>");
}
pw.println("<td>" + ub.getEmail() + "</td>");
pw.println("<td>" + ub.getGrade() + "</td>");
pw.println("</tr>");
}
pw.println("</table><br>");
pw.println("Current page is " + pageNow + "<br><br>");
int pageCount = ubc.getPageCount();
if (pageNow != 1)
pw.println("<a href=queryusertemp?toPage=" + (pageNow - 1) + "&username=" + username
+ "&qType=" + queryType + ">" + "Previous" + "</a>");
int maxPage = pageNow + 4;
if (maxPage <= pageCount) {
for (int i = pageNow; i <= maxPage; i++) {
pw.println("<a href=queryusertemp?toPage=" + i + "&username=" + username + "&qType="
+ queryType + ">" + i + "</a>");
}
} else {
for (int i = pageNow; i <= pageCount; i++) {
pw.println("<a href=queryusertemp?toPage=" + i + "&username=" + username + "&qType="
+ queryType + ">" + i + "</a>");
}
}
if (pageNow != pageCount)
pw.println("<a href=queryusertemp?toPage=" + (pageNow + 1) + "&username=" + username
+ "&qType=" + queryType + ">" + "Next" + "</a>");
pw.println("<br><form action=queryusertemp>");
pw.println(
"<label for='goPage'>Skip to:<input type=number name=toPage id='goPage' min='1' max="
+ pageCount + "></label>");
pw.println("<input type=hidden name=qType value=" + queryType + ">");
pw.println("<input type=hidden name=username value=" + username + ">");
pw.println("<input type=hidden name=testString value=" + username + ">");
pw.println("<input type=submit value=GO>");
pw.println("</form>");
}
}
}
pw.println("<br><br><a href=main>Return to Main Page</a>");
pw.println("<br><br><img id='flower' src=imgs/flower.png>");
pw.println("</body>");
pw.println("</html>");
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest req, HttpServletResponse res) {
doGet(req, res);
}
}
最下面的隐藏表单部分提交了toPage、qType、username、testString给当前页面。但是在测试部分（控制台输出）却只能接收到toPage、qType和testString，username的值变成了 ""。
求解。
