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How to write a simple servlet |
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Java Servlets allow a software developer to add dynamic content
to a web server using the Java platform. The generated content is commonly
HTML, but may be other data such as XML.
The simple servlet below shows how a servlet looks like:
import java.io.*;
import javax.servlet.*;
public class SampleServlet implements Servlet {
private ServletConfig config;
public void init (ServletConfig config) throws ServletException {
this.config = config;
}
public void destroy() {} // do nothing
public ServletConfig getServletConfig() {
return config;
}
public String getServletInfo() {
return "A Simple Servlet";
}
public void service (ServletRequest req, ServletResponse res)
throws ServletException, IOException {
res.setContentType( "text/html" );
// Always set the Content Type before data is printed
PrintWriter out = res.getWriter();
out.println( "<html>" );
out.println( "<head>" );
out.println( "<title>A Sample Servlet</title>" );
out.println( "</head>" );
out.println( "<body>" );
out.println( "<h1>A Sample Servlet</h1>" );
out.println( "</body>" );
out.println( "</html>" );
out.close();
}
}
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