General discussion on Servlets given indepth like differences, WAR file creation etc.
Using the method getResourceAsStream(), a Servlet can use any file on the system (or Web application in WEB-INF folder) and load it. To load, the Sevlet container does not need a traditional class loader. This method returns an object of InputStream that refers the file passed as parameter. The InputStream (a byte stream) object can …
Retrieve Header Information with getHeaderNames() getHeader() When a client clicks a hyper link or a submit button, we know that the data entered by the user in the Form fields is sent to server and is the default behavior of submit button. Ofcourse, right. But along with a lot of extra information goes to server …
Servlet WAR File Tomcat is explained step-by-step and follow it. We have seen earlier what a JAR file is, its options, creation and advantages in JAR (Java ARchive) Files. Now let us study what a WAR file is and its creation etc. WAR stands for Web ARchive. A WAR file is a JAR file, but …
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Servlet WAR File Weblogic Creation, Deployment and Execution is shown step-by-step for a Beginner. With the release of the Java Servlet Specification 2.2, the concept of a Web application was introduced. According to this specification, a "Web Application is a collection of servlets, html pages, classes, and other resources that can be bundled and run …
One of the aspects of Servlets is reading the HTML/Applet data sent by the client like login data etc. For this, three methods exist in ServletRequest interface – getParameter(String), getParameterNames() and getParameterValues(String). These methods are inherited by HttpServletRequest interface. Following are the method signatures as defined in javax.servlet.ServletRequest interface. public java.lang.String getParameter(java.lang.String name): Returns the …
We have seen earlier how to read and send file contents of a text file and HTML file to client. They look a little bit tedious of more code. One more style exist where all the data is converted to a binary and send to client. With the help of content type, the browser is …
What is client data? getRequestURL(): When the user clicks the submit button, we think that the data entered by the user like user name and password are sent to the server. Ofcourse, right. But along with it, lot of client data goes to the server. The client data includes the protocol used by the client, …
What is client data? When the user clicks the submit button, we think that the data entered by the user like user name and password are sent to the server. Ofcourse, right. But along with it, lot of client data goes to the server. The client data includes the protocol used by the client to …
getRequestURL() vs getRequestURI() methods are used by Servlet Programmer to retrieve the URL particulars of client. getRequestURL() and getRequestURI() methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL() vs getRequestURI() …
Programmer uses getServletPath() method to retrieve the alias name used by client. getServletPath() Method is defined in ServletRequest inherited by HttpServletRequest. This program uses getServletPath() of HttpServletRequest to retrieve the alias name (of <servlet-mapping>) tag. Client uses this alias name to call the Servlet. Following is the method signature. Method is defined in HttpServletRequest interface. …
getMethod() method is defined in HttpServletRequest interface from javax.servlet.http package. With getMethod() method, the Servlet Programmer can know what method (either get or post) is used by the client from HTML file to call the Servlet. Let us see what Java API says about this method. java.lang.String getMethod(): Returns the name of the HTTP method …
getProtocol() method is defined in ServletRequest interface from javax.servlet package and inherited by HttpServletRequest. With getProtocol() method, the Servlet Programmer can know what protocol (like HTTP/1.0 or HTTP/1.1) is used by the client from HTML file to call the Servlet. Let us see what Java API says about this method. java.lang.String getProtocol(): Returns the name …
getScheme() method is defined in ServletRequest interface from javax.servlet package inherited by HttpServletRequest. With getScheme() method, the Servlet Programmer can know what protocol (like HTTP) is used by the client from HTML file to call the Servlet. Let us see what Java API says about this method. public java.lang.String getScheme(): Returns the name of the …
Both are defined in ServletRequest interface. Using these methods, the servlet programmer can know the protocol used by the client to call the servlet. They differ slightly in the output. getProtocol() returns the protocol with version and getScheme() returns protocol without version. See the output screen at the end. Let us see what Java API …
This method is defined in HttpServletRequest interface from javax.servlet.http package. With this method, the servlet programmer can know the data (through FORM fields like user name etc.) sent by the client. What is query string in servlets? It is the string containing the name of FORM fields and the data entered by the user in …
getServerPort() method is defined in ServletRequest interface from javax.servlet package and inherited by HttpServletRequest. With getServerPort() method, the Servlet Programmer can know what port number is used by the client from HTML file to call the Servlet. Let us see what Java API says about this method. int getServerPort(): Returns the port number to which …
This method is defined in ServletRequest interface from javax.servlet package and inherited by HttpServletRequest. With this method, the servlet programmer can know the length of data (through FORM fields like user name etc.) sent by the client. Or to say, the length (in bytes) of query string. What is query string in servlets? It is …
getRemoteAddr() method is defined in ServletRequest interface from javax.servlet package inherited by HttpServletRequest. With this method, the servlet programmer can know the IP address of the client from which the request came. Let us see what Java API says about this method. String getRemoteAddr(): Returns the Internet Protocol (IP) address of the client or last …
This method is defined in ServletRequest interface from javax.servlet package inherited by HttpServletRequest. With this method, the servlet programmer can know the name of the client from which the request came. Let us see what Java API says about this method. java.lang.String getRemoteHost(): Returns the fully qualified name of the client or the last proxy …
Both getRemoteAddr() vs getRemoteHost() are defined in ServletRequest interface and serves the Servlet Programmer to retrieve the client system particulars from where the request came. They differ slightly in the output. 1. getRemoteAddr() returns a string containing the IP address (in format like IPiv, 127.0.0.1) of the client. 2. getRemoteHost() returns a string containing the …
