Java Tutorial/Servlet/ServletContext
Deployment Descriptor
<source lang="java">
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 WebAppProperties extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
ServletContext context = getServletContext();
String displayName = context.getServletContextName();
if (displayName == null) {
displayName = "(no display-name element defined)";
}
out.println("<html>");
out.println("<head>");
out.println("<title>Web Application Properties");
out.println("</title>");
out.println("</head><body>");
out.println("Web Application Properties</h2>");
out.println("
Name: " + displayName);
out.println("
Context: " + req.getContextPath());
out.println("");
out.println("Initialization Parameters
");
out.println("
");
out.println("| " + name + " | "); out.println("" + context.getInitParameter(name) + " | "); out.println("
out.println("</body>");
out.println("</html>");
out.flush();
}
}</source>
Get Servlet Context InitParameter
<source lang="java">
import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class MyServlet extends HttpServlet {
private String dbName="";
private String dbPassword="";
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = getServletContext();
dbName = context.getInitParameter("name");
dbPassword = context.getInitParameter("password");
}
public void doGet (HttpServletRequest req, HttpServletResponse res) throws IOException
{
ServletOutputStream out = res.getOutputStream();
res.setContentType("text/html");
out.println("<html><head><title>Basic Servlet</title></head>");
out.println("<body>Database username is " + dbName);
out.println("
Database password is " + dbPassword + "");
out.println("</body></html>");
}
}</source>
