Java/Servlets/Form
Содержание
Basic Form processor
/*
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.ru/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.ru/xml/ns/j2ee
http://java.sun.ru/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
<servlet>
<servlet-name>BasicFormProcessor</servlet-name>
<servlet-class>BasicFormProcessor</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BasicFormProcessor</servlet-name>
<url-pattern>/formProcessor</url-pattern>
</servlet-mapping>
</web-app>
*/
import java.io.IOException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class BasicFormProcessor extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException {
ServletOutputStream out = res.getOutputStream();
res.setContentType("text/html");
out
.println("<html><head><title>Basic Form Processor Output</title></head>");
out.println("<body>");
out.println("<h1>Here is your Form Data</h1>");
//extract the form data here
String title = req.getParameter("title");
String name = req.getParameter("name");
String city = req.getParameter("city");
String country = req.getParameter("country");
String tel = req.getParameter("tel");
String age = req.getParameter("age");
// extracting data from the checkbox field
String[] interests = req.getParameterValues("interests");
//output the data into a web page
out.println("Your title is " + title);
out.println("<br>Your name is " + name);
out.println("<br>Your city is " + city);
out.println("<br>Your country is " + country);
out.println("<br>Your tel is " + tel);
out.println("<br>Your interests include<ul> ");
for (int i = 0; i < interests.length; i++) {
out.println("<li>" + interests[i]);
}
out.println("</ul>");
out.println("<br>Your age is " + age);
out.println("</body></html>");
}
}
feedback Form
<HTML><HEAD><TITLE> feedback Form </TITLE></HEAD>
<BODY><H1> Feedback Form </H1>
<HR>
<BR>
<FORM NAME="ParameterPost" ACTION="/servlets-examples/PrintFormParams" METHOD="POST">
<TABLE BGCOLOR="BLANCHEDALMOND" ALIGN="CENTER" BORDER="0">
<TR>
<TD ALIGN="CENTER"><B>Name:</B></TD>
<TD ALIGN="CENTER"> <INPUT TYPE="TEXT" SIZE="25" NAME="Person"></TD>
</TR>
<TR>
<TD ALIGN="CENTER"><B>Email:</B></TD>
<TD ALIGN="CENTER"> <INPUT TYPE="TEXT" SIZE="25" MAXLENGTH="40" NAME="emailaddress"></TD>
</TR>
<TR>
<TD ALIGN="CENTER"><B>How did you find this site?</B></TD>
<TD ALIGN="CENTER">
<SELECT NAME="from" SIZE="1">
<OPTION VALUE = "Website" SELECTED>Another Website</OPTION>
<OPTION VALUE = "search engine">A search engine</OPTION>
<OPTION VALUE = "friend">A friend told you</OPTION>
<OPTION VALUE = "email">From an email</OPTION>
<OPTION VALUE = "unlisted">Another way not listed here</OPTION>
</SELECT>
</TD>
</TR>
<TR>
<TD ALIGN="CENTER"><B>How would you rate my website:</B></TD>
<TD ALIGN="CENTER">
<INPUT TYPE="radio" NAME = "rating" VALUE = "Excellent"> Excellent
<INPUT TYPE="radio" NAME = "rating" VALUE = "Good"> Good
<INPUT TYPE="radio" NAME = "rating" VALUE = "Average" CHECKED> Average
<INPUT TYPE="radio" NAME = "rating" VALUE = "Poor"> Poor
<INPUT TYPE="radio" NAME = "rating" VALUE = "Overhaul"> Needs an Overhaul
</TD>
</TR>
<TR>
<TD ALIGN="CENTER"><B>Comments or Suggestions:</B></TD>
<TD ALIGN="CENTER">
<TEXTAREA ROWS="6" COLS="40" WRAP="PHYSICAL" Name="suggestions">
Enter any comments or suggestions you have here.</TEXTAREA>
</TD>
</TR>
<TR>
<TD ALIGN="CENTER"><B>Do you think this form looks nice?</B></TD>
<TD ALIGN="CENTER">
<INPUT TYPE="CHECKBOX" NAME="formrating" VALUE="yes">
</TD>
</TR>
<TR>
<TD ALIGN="LEFT">
<INPUT TYPE="SUBMIT" VALUE="Send Comments" ALIGN="MIDDLE">
<INPUT TYPE="RESET" VALUE="Clear Form" ALIGN="MIDDLE">
</TD>
</TR>
</FORM>
</BODY>
</html>
<!-- web.xml -->
<servlet>
<servlet-name>PrintFormParams</servlet-name>
<servlet-class>PrintFormParams</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PrintFormParams</servlet-name>
<url-pattern>/PrintFormParams</url-pattern>
</servlet-mapping>
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class PrintFormParams extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintParams(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintParams(request, response);
}
public void PrintParams(HttpServletRequest request,
HttpServletResponse response) throws IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String htmlHeader = "<HTML><HEAD><TITLE> Printed Form Parameters </TITLE></HEAD><BODY>";
String htmlFooter = "</BODY></HTML>";
out.println(htmlHeader);
out.println("<TABLE ALIGN=CENTER BORDER=1>");
out.println("<tr><th> Input Name </th><th> Value </th>");
Enumeration enum = request.getParameterNames();
while (enum.hasMoreElements()) {
String inputName = (String) enum.nextElement();
String value = request.getParameter(inputName);
if (value.length() != 0) {
out.println("<tr><td align=center>" + inputName + "</td>");
out.println("<td align=center>" + value + "</td></tr>");
} else {
out.println("<tr><td align=center>" + inputName + "</td>");
out.println("<td align=center><i>Null</i></td></tr>");
}
}
out.println("</TABLE><BR>");
out.println(htmlFooter);
}
}
HTML Forms with Servlets
React to user form input
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FirstServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
//set the MIME type of the response to "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client
java.io.PrintWriter out = response.getWriter();
//output the HTML content
out.println("<html><head>");
out.println("<title>Help Page</title></head><body>");
out.println("<h2>Please submit your information</h2>");
//make sure method="post" so that the servlet service method
//calls doPost in the response to this form submit
out.println("<form method=\"post\" action =\""
+ request.getContextPath() + "/FirstServlet\" >");
out.println("<table border=\"0\"><tr><td valign=\"top\">");
out.println("Your first name: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"firstname\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("Your last name: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"lastname\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("Your email: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"email\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("<input type=\"submit\" value=\"Submit Info\"></td></tr>");
out.println("</table></form>");
out.println("</body></html>");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
//display the parameter names and values
Enumeration paramNames = request.getParameterNames();
String parName;
boolean emptyEnum = false;
if (!paramNames.hasMoreElements())
emptyEnum = true;
//set the MIME type of the response to "text/html"
response.setContentType("text/html");
//use a PrintWriter send text data to the client
java.io.PrintWriter out = response.getWriter();
//Begin assembling the HTML content
out.println("<html><head>");
out.println("<title>Submitted Parameters</title></head><body>");
if (emptyEnum) {
out.println("<h2>No parameters</h2>");
} else {
out.println("<h2>Here are the submitted parameter values</h2>");
}
while (paramNames.hasMoreElements()) {
parName = (String) paramNames.nextElement();
out.println("<strong>" + parName + "</strong> : "
+ request.getParameter(parName));
out.println("<br />");
}
out.println("</body></html>");
}
}
