Re: doGet () & doPost ()
- 1)In doPost, parame ...
- 2)There is no maximum size for data
- 3)Parameters are encrypted
- 4)Dopost is generally used to update or post some information to the server
- 5)DoPost is slower compared to doGet since doPost does not write the content length
- 6)This method does not need to be idempotent. ...
- 7)This method does not need to be either safe
| doGet() | doPost() |
|---|---|
| doget() is Faster. | dopost() Slower. |
| In doget() only 1024 characters limit. | In dopost() doest not have limit. |
What is the difference between Doget and doPost in http?
In HTTP protocal GET and POST are type of request headers. So whenever a GET type of request is recieved by server, doGet () method is invoked at the backend. Same goes for POST, doPost () is invoked. Example: This will invoke doGet when html form is submitted.
How do I combine two Doget and doPost methods?
Place request processing logic in a user-defined method and call that method from both doGet (-,-) and doPost (-,-) methods => Not recommended. Override both doGet (-,-) and doPost (-,-) methods and keep request processing logic in one method, call that method from another method => recommended approach.
How do HTTPServlet containers call Doget (-,-) and doPost(-,-) method?
Servlet containers don’t call doGet (-,-) or doPost (-,-) method directly on our servlet component, they will be called through the service (-,-) method of the superclass (HttpServlet class). It means HttpServlet class internally calls the doGet (-,-) method for the GET mode request and calls the doPost (-,-) for POST mode request.
What is the difference between Doget and Doget parameters?
Parameters are not encrypted. doGet method generally is used to query or to get some informationfromthe server. doGet is faster if we set the response content length since the same connection is used.
Which is secure doGet or doPost?
If you going to use doGet() method this will append the your username and password end of url.So it is not secure.So i suggest you that go for doPost() method that is more secure. And if you want more security you also go SSL(Secure Socket Layer).
What is a doGet?
doGet() and doPost() are HTTP requests handled by servlet classes. In doGet(), the parameters are appended to the URL and sent along with header information.
WHO calls doGet () and doPost () method?
The client's request, remember, always includes a specific HTTP Method. If the HTTP Method is a GET, the service() method calls doGet(). If the HTTP request Method is a POST, the service() method calls doPost(). Yes, there are other HTTP 1.1 Methods besides GET and POST.
What is doPost method?
The doPost() method in servlets is used to process the HTTP POST requests. It is used to submit the data from the browser to the server for processing. The data submitted with POST method type is sent in the message body so it is secure and cannot be seen in the URL.
What is the difference between GET and POST method in Java?
Both GET and POST method is used to transfer data from client to server in HTTP protocol but Main difference between POST and GET method is that GET carries request parameter appended in URL string while POST carries request parameter in message body which makes it more secure way of transferring data from client to ...
What is the use of RequestDispatcher?
Interface RequestDispatcher. Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server.
How doGet method is called in servlet?
doGet. Called by the server (via the service method) to allow a servlet to handle a GET request. Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.
What is doPost method in servlet?
The doPost() method is called by the server (via the service method) to allow a servlet to handle a POST request. Generally, we use the doPost() method for sending information to the server like HTML form data.
What is the difference between sendRedirect and forward?
Difference between forward() and sendRedirect() method The forward() method works at server side. The sendRedirect() method works at client side. It sends the same request and response objects to another servlet.
What is the use of GET and POST method?
Compare GET vs. POSTGETPOSTRestrictions on data lengthYes, when sending data, the GET method adds the data to the URL; and the length of a URL is limited (maximum URL length is 2048 characters)No restrictionsRestrictions on data typeOnly ASCII characters allowedNo restrictions. Binary data is also allowed7 more rows
What is the difference between GenericServlet and HttpServlet?
The main difference between GenericServlet and HttpServlet is that the GenericServlet is protocol independent that can be used with any protocol such as HTTP, SMTP, FTP, CGI etc. while HttpServlet is protocol dependent and is only used with HTTP protocol.
What are the parameters of the doGet () method?
The first two are parameters, and the third a throws list.HttpServletRequest req.HttpServletResponse res.throws ServletException, IOException.
When destroy method is called in Servlet?
Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. This method is only called once all threads within the servlet's service method have exited or after a timeout period has passed.
What type of servlets use these methods doGet () doPost () doHead doDelete () doTrace ()?
HttpServlets - doGet(), doPost(),doHead, doDelete(), doTrace() - Servlets.
What are the methods in Servlet?
Methods of Servlet interfaceMethodDescriptionpublic void destroy()is invoked only once and indicates that servlet is being destroyed.public ServletConfig getServletConfig()returns the object of ServletConfig.public String getServletInfo()returns information about servlet such as writer, copyright, version etc.2 more rows
What are the characteristics of the post method?
Features of POST POST method request gets input from the request body and query string. Data passed using the POST method will not visible in query parameters in browser URL. parameters of POST methods are not saved in browser history. There is no restriction in sending the length of data.
What is the maximum size of data that can be sent using doget?
Maximum size of data that can be sent using doget is 240 bytes There is no maximum size for data. Parameters are not encrypted Parameters are encrypted. DoGet method generally is used to query or to get some information from the server Dopost is generally used to update or post some information to the server.
Is DoGet idempotent?
DoGet should be idempotent. i.e. doget should be able to be repeated safely many times This method does not need to be idempotent. Operations requested through POST can have side effects for which the user can be held accountable, for example, updating stored data or buying items online.
What is HTTP GET request?
Usually, HTTP GET requests are idempotent. I.e. you get exactly the same result everytime you execute the request (leaving authorization/authentication and the time-sensitive nature of the page —search results, last news, etc— outside consideration). We can talk about a bookmarkable request. Clicking a link, clicking a bookmark, entering raw URL in browser address bar, etcetera will all fire a HTTP GET request. If a Servlet is listening on the URL in question, then its doGet () method will be called. It's usually used to preprocess a request. I.e. doing some business stuff before presenting the HTML output from a JSP, such as gathering data for display in a table.
How to pass data in HTML?
If you do <form action="identification" > for your html form, data will be passed using 'Get' by default and hence you can catch this using doGet function in your java servlet code. This way data will be passed under the HTML header and hence will be visible in the URL when submitted. On the other hand if you want to pass data in HTML body, then USE Post: <form action="identification" method="post"> and catch this data in doPost function. This was, data will be passed under the html body and not the html header, and you will not see the data in the URL after submitting the form.
How to use GET method?
The GET method is used in one of two ways: When no method is specified, that is when you or the browser is requesting a simple resource such as an HTML page, an image, etc. When a form is submitted, and you choose method=GET on the HTML tag. If the GET method is used with an HTML form, then the data collected through the form is sent to the server by appending a "?" to the end of the URL , and then adding all name=value pairs (name of the html form field and value entered in that field) separated by an "&" Example: GET /sultans/shop//form1.jsp?name=Sam%20Sultan&iceCream=vanilla HTTP/1.0 optional headeroptional header<< empty line >>>
What happens if a user is found in a DB?
You see, if the User is found in DB (i.e. username and password are valid), then the User will be put in session scope (i.e. "logged in") and the servlet will redirect to some main page (this example goes to http://example.com/contextname/home ), else it will set an error message and forward the request back to the same JSP page so that the message get displayed by $ {error}.
What are the disadvantages of the GET method?
Disadvantages of the GET method: Can only send 4K worth of data. (You should not use it when using a textarea field) Parameters are visible at the end of the URL. Advantages of the POST method: Parameters are not visible at the end of the URL . (Use for sensitive data ) Can send more that 4K worth of data to server.
Where is the JSP file located?
Note that the JSP file is explicitly placed in /WEB-INF folder in order to prevent endusers being able to access it directly without invoking the preprocessing servlet (and thus end up getting confused by seeing an empty table).
Can you hide login.jsp?
You can if necessary also "hide" the login.jsp in /WEB-INF/login.jsp so that the users can only access it by the servlet. This keeps the URL clean http://example.com/contextname/login. All you need to do is to add a doGet () to the servlet like this:
How to Write logic for the doGet and doPost method in Servlet
There are different ways to process the GET and POST mode request through the doGet and doPost method.
Example
Description:- Develop a Servlet-based web application to check whether a user is eligible for voting or not. Take an HTML form, and get input from the user. Based on the entered age check he/she is eligible for voting or not? Display the appropriate message to the end-user. Assume 18 is the minimum age for voting.