![Method Description
public String getParameter(String name) is used to obtain the value of a parameter by name.
public String[] getParameterValues(String
name)
returns an array of String containing all values of given parameter name. It
is mainly used to obtain values of a Multi select list box.
java.util.Enumeration getParameterNames() returns an enumeration of all of the request parameter names.
public int getContentLength() Returns the size of the request entity data, or -1 if not known.
public String getCharacterEncoding() Returns the character set encoding for the input of this request.
public String getContentType() Returns the Internet Media Type of the request entity data, or null if not
known.
public ServletInputStream getInputStream()
throws IOException
Returns an input stream for reading binary data in the request body.
public abstract String getServerName() Returns the host name of the server that received the request.
public int getServerPort() Returns the port number on which this request was received.](https://image.slidesharecdn.com/servlet-session6-200202115345/85/Servlet-session-6-6-320.jpg)
Servlet session 6
- 1. SESSION – 6 By→ Anuj Kumar Singh
- 2. Load Servlet on Startup 1. The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet. 2. You can pass positive and negative value for the servlet. Advantage of load-on-startup element 1. Servlet is loaded at first request. That means it consumes less time at first request. 2. If you specify the load-on-startup in web.xml, servlet will be loaded at project deployment time or server start. 3. So, it will take less time for responding to first request.
- 3. Passing positive value If you pass the positive value, the lower integer value servlet will be loaded before the higher integer value servlet. In other words, container loads the Servlets in ascending integer value. The 0 value will be loaded first then 1, 2, 3 and so on. Example This <load-on-startup>0</load-on-startup> Decreases your time for starting Servlet file.
- 4. The value 0,1,2,3 and so on There are defined FirstServlets, this servlets will be loaded at the time of project deployment or server start.
- 5. Servlet request Interfaces An object of ServletRequest is used to provide the client request information to a servlet such as content type, content length, parameter names and values, header information's, attributes etc. Methods of ServletRequest interface Following are some methods define in the ServletRequest interfaces
- 6. Method Description public String getParameter(String name) is used to obtain the value of a parameter by name. public String[] getParameterValues(String name) returns an array of String containing all values of given parameter name. It is mainly used to obtain values of a Multi select list box. java.util.Enumeration getParameterNames() returns an enumeration of all of the request parameter names. public int getContentLength() Returns the size of the request entity data, or -1 if not known. public String getCharacterEncoding() Returns the character set encoding for the input of this request. public String getContentType() Returns the Internet Media Type of the request entity data, or null if not known. public ServletInputStream getInputStream() throws IOException Returns an input stream for reading binary data in the request body. public abstract String getServerName() Returns the host name of the server that received the request. public int getServerPort() Returns the port number on which this request was received.
- 7. Example of ServletRequest to display the name of the user index.html