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This article mainly explains "how to use Servlet's GET request". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to use Servlet's GET request.

A GET request is a request made after a user enters an address in the browser's address bar, clicks a link on a web page, or generates an HTML form with no defined method. Servlets can also easily handle form submission (POST), which we'll talk about in the next few sections.

Import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class SomeServlet extends HttpServlet {public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

/ / use "request" to read http headers (such as cookie)

/ / and HTML form data (such as data entered and submitted by the user)

/ / specify http response and http message headers with "response"

/ / (for example, specify the type of information and set cookie).

PrintWriter out = response.getWriter ()

/ / output the content to the browser with "out"

}}

Whether you use the doGet or doPost methods, servlet uses the HttpServlet extension class. These methods can be divided into two categories: HttpServletRequest and HttpServletResponse. HttpServletRequest contains methods to get form data, HTTP headers, and other information. The HttpServletResponse contains a specified HTTP response (200,404, etc.). , information headers (Content-Type, Set-Cookie, etc.) And more importantly, you can use the PrintWriter method to output information to the client. Note that the doGet and doPost methods throw two exceptions, so you must include them in the definition. To use PrintWriter, HttpServlet, and HttpServletRequest, the HttpServletResponse method must also introduce java.io, javax.servlet, and javax.servlet.http, respectively. Generally speaking, doGet and doPost are called by the service method, but sometimes you may want to go beyond the service method and directly use your own defined service method, such as defining a servlet that can handle both GET and POST requests.

Thank you for your reading, the above is the content of "how to use Servlet's GET request". After the study of this article, I believe you have a deeper understanding of how to use Servlet's GET request, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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