Servlet Examples

Servlet Examples

1.Hello World

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class HelloWorld extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.        out.println("<html>");
13.        out.println("<head>");
14.        out.println("<title>Hello World!</title>");
15.        out.println("</head>");
16.        out.println("<body>");
17.        out.println("<h1>Hello World!</h1>");
18.        out.println("</body>");
19.        out.println("</html>");
20.    }
21.}

2.Request Info

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class RequestInfo extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.        out.println("<html>");
13.        out.println("<body>");
14.        out.println("<head>");
15.        out.println("<title>Request Information Example</title>");
16.        out.println("</head>");
17.        out.println("<body>");
18.        out.println("<h3>Request Information Example</h3>");
19.        out.println("Method: " + request.getMethod());
20.        out.println("Request URI: " + request.getRequestURI());
21.        out.println("Protocol: " + request.getProtocol());
22.        out.println("PathInfo: " + request.getPathInfo());
23.        out.println("Remote Address: " + request.getRemoteAddr());
24.        out.println("</body>");
25.        out.println("</html>");
26.    }
27.
28.    /**
29.     * We are going to perform the same operations for POST requests
30.     * as for GET methods, so this method just sends the request to
31.     * the doGet method.
32.     */
33.
34.    public void doPost(HttpServletRequest request, HttpServletResponse response)
35.    throws IOException, ServletException
36.    {
37.        doGet(request, response);
38.    }
39.}

3.Request Headers

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class RequestHeaderExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.        Enumeration e = request.getHeaderNames();
14.        while (e.hasMoreElements()) {
15.            String name = (String)e.nextElement();
16.            String value = request.getHeader(name);
17.            out.println(name + " = " + value);
18.        }
19.    }
20.}

4. Request Parameters

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class RequestParamExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.        out.println("<html>");
14.        out.println("<head>");
15.        out.println("<title>Request Parameters Example</title>");
16.        out.println("</head>");
17.        out.println("<body>");
18.        out.println("<h3>Request Parameters Example</h3>");
19.        out.println("Parameters in this request:<br>");
20.        if (firstName != null || lastName != null) {
21.            out.println("First Name:");
22.            out.println(" = " + HTMLFilter.filter(firstName) + "<br>");
23.            out.println("Last Name:");
24.            out.println(" = " + HTMLFilter.filter(lastName));
25.        } else {
26.            out.println("No Parameters, Please enter some");
27.        }
28.        out.println("<P>");
29.        out.print("<form action=\"");
30.        out.print("RequestParamExample\" ");
31.        out.println("method=POST>");
32.        out.println("First Name:");
33.        out.println("<input type=text size=20 name=firstname>");
34.        out.println("<br>");
35.        out.println("Last Name:");
36.        out.println("<input type=text size=20 name=lastname>");
37.        out.println("<br>");
38.        out.println("<input type=submit>");
39.        out.println("</form>");
40.        out.println("</body>");
41.        out.println("</html>");
42.    }
43.
44.    public void doPost(HttpServletRequest request, HttpServletResponse res)
45.    throws IOException, ServletException
46.    {
47.        doGet(request, response);
48.    }
49.}

5. Cookies

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class CookieExample extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.
13.        // print out cookies
14.
15.        Cookie[] cookies = request.getCookies();
16.        for (int i = 0; i < cookies.length; i++) {
17.            Cookie c = cookies[i];
18.            String name = c.getName();
19.            String value = c.getValue();
20.            out.println(name + " = " + value);
21.        }
22.
23.        // set a cookie
24.
25.        String name = request.getParameter("cookieName");
26.        if (name != null && name.length() > 0) {
27.            String value = request.getParameter("cookieValue");
28.            Cookie c = new Cookie(name, value);
29.            response.addCookie(c);
30.        }
31.    }
32.}

6. Sessions

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class SessionExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.
14.        HttpSession session = request.getSession(true);
15.
16.        // print session info
17.
18.        Date created = new Date(session.getCreationTime());
19.        Date accessed = new Date(session.getLastAccessedTime());
20.        out.println("ID " + session.getId());
21.        out.println("Created: " + created);
22.        out.println("Last Accessed: " + accessed);
23.
24.        // set session info if needed
25.
26.        String dataName = request.getParameter("dataName");
27.        if (dataName != null && dataName.length() > 0) {
28.            String dataValue = request.getParameter("dataValue");
29.            session.setAttribute(dataName, dataValue);
30.        }
31.
32.        // print session contents
33.
34.        Enumeration e = session.getAttributeNames();
35.        while (e.hasMoreElements()) {
36.            String name = (String)e.nextElement();
37.            String value = session.getAttribute(name).toString();
38.            out.println(name + " = " + value);
39.        }
40.    }
41.}

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