How to invoke a servlet API in Java?

1 year ago
Liam
2 minutes

To call the Servlet interface, you need to create a class that extends the HttpServlet class. Then, override the doGet() or doPost() method and implement the necessary business logic as needed.

Here is an example code:

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        // 设置响应内容类型
        response.setContentType("text/html");

        // 实现业务逻辑
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<body>");
        out.println("<h1>Hello World!</h1>");
        out.println("</body>");
        out.println("</html>");
    }
}

Configure Servlet mapping in the web.xml file.

<servlet>
    <servlet-name>MyServlet</servlet-name>
    <servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>MyServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
</servlet-mapping>

By accessing http://localhost:8080/yourWebAppName/hello in the browser, the doGet() method in the MyServlet class will be called and the result will be output to the browser.

Please note that this is just a simple example and additional logic and handling methods can be added as needed in actual applications.

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