Java/Servlets/Form
Содержание
Basic Form processor
<source lang="java">
/* <?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("Here is your Form Data
"); //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("
Your name is " + name);
out.println("
Your city is " + city);
out.println("
Your country is " + country);
out.println("
Your tel is " + tel);
out.println("Your interests include
- ");
for (int i = 0; i < interests.length; i++) {
out.println("
- " + interests[i]); } out.println("
out.println("
Your age is " + age);
out.println("</body></html>");
}
}
</source>
feedback Form
<source lang="java">
<HTML><HEAD><TITLE> feedback Form </TITLE></HEAD>
<BODY>Feedback Form
<FORM NAME="ParameterPost" ACTION="/servlets-examples/PrintFormParams" METHOD="POST">
| Name: | <INPUT TYPE="TEXT" SIZE="25" NAME="Person"> |
| Email: | <INPUT TYPE="TEXT" SIZE="25" MAXLENGTH="40" NAME="emailaddress"> |
| How did you find this site? |
<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>
|
| How would you rate my website: |
<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 |
| Comments or Suggestions: |
<TEXTAREA ROWS="6" COLS="40" WRAP="PHYSICAL" Name="suggestions">
Enter any comments or suggestions you have here.</TEXTAREA>
|
| Do you think this form looks nice? |
<INPUT TYPE="CHECKBOX" NAME="formrating" VALUE="yes"> |
<INPUT TYPE="SUBMIT" VALUE="Send Comments" ALIGN="MIDDLE"> <INPUT TYPE="RESET" VALUE="Clear Form" ALIGN="MIDDLE"> |
| Input Name | Value | ");
|---|---|
| " + inputName + " | "); out.println("" + value + " |
| " + inputName + " | "); out.println("Null |
");
out.println(htmlFooter); }
}
</source>
HTML Forms with Servlets
React to user form input
<source lang="java">
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("Please submit your information
"); //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("| "); out.println("Your first name: | ");
out.println("<input type=\"text\" name=\"firstname\" size=\"20\">");
out.println(" |
| "); out.println("Your last name: | ");
out.println("<input type=\"text\" name=\"lastname\" size=\"20\">");
out.println(" |
| "); out.println("Your email: | ");
out.println("<input type=\"text\" name=\"email\" size=\"20\">");
out.println(" |
| "); out.println("<input type=\"submit\" value=\"Submit Info\"> |
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("No parameters
"); } else {
out.println("Here are the submitted parameter values
"); }
while (paramNames.hasMoreElements()) {
parName = (String) paramNames.nextElement();
out.println("" + parName + " : "
+ request.getParameter(parName));
out.println("
");
}
out.println("</body></html>");
}
}
</source>
