What are the application scenarios of Java Servlet?
Java Servlet can be used for: 1. Dynamic content generation; 2. Data access and processing; 3. Form processing; 4. File upload; 5. Session management; 6. Filter. Example: Create a FormSubmitServlet to handle form submission, taking name and email as parameters, and redirecting to success.jsp.
Application scenarios of Java Servlet
Servlet plays a vital role in Java Web development, which allows developers Use Java code to handle HTTP requests and responses. Some common Servlet application scenarios are listed below:
1. Dynamic content generation:
Servlet can dynamically generate content in formats such as HTML, XML or JSON to create interactive Web page.
2. Data access and processing:
Servlet can access and process data from a database or other data sources, and then present the data to the user in a visual form.
3. Form processing:
Servlet can process data submitted by HTML forms and be used to create, update or delete records in the database.
4. File upload:
Servlet can handle file upload and save it to a specified location on the server.
5. Session management:
Servlet can use the HTTP Session object to temporarily store user-specific information to achieve session management.
6. Filter:
Servlet can act as a filter, intercepting and modifying HTTP requests and responses before or after they are processed.
Practical case:
Create a Servlet to process the data submitted by the form:
import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/form-submit") public class FormSubmitServlet extends HttpServlet { protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String name = req.getParameter("name"); String email = req.getParameter("email"); // 使用 name 和 email 逻辑处理表单数据... // 重定向到另一个页面 resp.sendRedirect("/success.jsp"); } }
In the HTML form, <form> The
action attribute of
should be set to /form-submit
:
<form action="/form-submit" method="post"> <input type="text" name="name"> <input type="email" name="email"> <input type="submit" value="Submit"> </form>
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