Chapter 3 Example

Tiêu đề: Chapter 3 Example 15/8/2009, 9:51 am

Đây là ví dụ của thầy giáo, các bạn vào đây tham khảo nhé.

ContextListener.java

Code:: import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class ContextListener implements ServletContextListener{

public void contextInitialized(ServletContextEvent contextEvent) {
System.out.println("CONTEXT INITIALIZED");
}

public void contextDestroyed(ServletContextEvent arg0) {
System.out.println("CONTEXT DESTROYED");
}
}

ServletInit.java

Code:: import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletInit extends HttpServlet {
private String servletName;
private String initParam1;
private String initParam2;

@Override
public void init() throws ServletException {
super.init();

servletName = super.getServletConfig().getServletName();
initParam1 = super.getServletConfig().getInitParameter("initParam1");
initParam2 = super.getServletConfig().getInitParameter("initParam2");
}

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet ServletInit</title>");
out.println("</head>");
out.println("<body>");

out.println("<h3>ServletConfig</h3><p>");
out.println("ServletConfig.getServletName() : " + servletName + "<br />");
out.println("ServletConfig.getInitParameter(\"initParam1\") : " + initParam1 + "<br />");
out.println("ServletConfig.getInitParameter(\"initParam2\") : " + initParam2 + "<br />");

ServletContext context = super.getServletContext();
context.setAttribute("testContextAttribute", "testContextValue");

out.println("<h3>Getting information about server</h3><p>");
out.println("getServerInfo : " + context.getServerInfo() + "<br />" );
Enumeration<String> contextAttributeNames = context.getAttributeNames();
String name;
while ( contextAttributeNames.hasMoreElements() ) {
name = contextAttributeNames.nextElement();
out.println("ServletContext.getAttribute(" + name + "): " + context.getAttribute(name) + "<br />");
}
out.println("<h3>Getting information about client</h3><p>");
out.println("HttpServletRequest.getRemoteUser() " + request.getRemoteUser() + "<br />");
out.println("HttpServletRequest.getRemoteHost() " + request.getRemoteHost() + "<br />" );

RequestDispatcher requestDispatcher = request.getRequestDispatcher("/TestServlet");
// requestDispatcher.forward(request, response);
requestDispatcher.include(request, response);

RequestDispatcher rd = request.getRequestDispatcher("/TestServlet");
rd.include( request, response );
log("11111111111111");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
public String getServletInfo() {
return "Short description";
}
}

SendCodeServlet.java

Code:: import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SendCodeServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
int code = 500;
try {
String strCode = request.getParameter("code");
code = Integer.parseInt(strCode);
} catch ( Exception e) {
// do nothing
} finally {
response.sendError(code);
}
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}

TestServlet.java

Code:: import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet TestServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>BEGIN TestServlet</h1>");

Enumeration<String> paramNames = request.getParameterNames();
while (paramNames.hasMoreElements()) {
String name = paramNames.nextElement();
out.println(name + " : " + request.getParameter(name) + "<br />");
}

out.println("Context attributes: ");
ServletContext context = super.getServletContext();
Enumeration<String> contextAttributeNames = context.getAttributeNames();
String name;
while ( contextAttributeNames.hasMoreElements() ) {
name = contextAttributeNames.nextElement();
out.println("ServletContext.getAttribute(" + name + "): " + context.getAttribute(name) + "<br />");
}

out.println("<h1>END uTestServlet</h1>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}

Chúc các bạn học tốt :lol!: .

Tiêu đề: Re: Chapter 3 Example 16/8/2009, 9:04 pm

Hoặc các bạn có thể download tại đây: Chapter 3 Example 591469

http://www.mediafire.com/?qmmra0dyzy2

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