How to access request parameter values in Java?

In Java, getting request parameter values usually involves using the HttpServletRequest object. Here is a simple example code demonstrating how to get request parameter values:

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

public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取单个请求参数值
        String parameterValue = request.getParameter("parameterName");

        // 获取多个请求参数值
        String[] parameterValues = request.getParameterValues("parameterName");

        // 输出请求参数值
        response.getWriter().println("Parameter Value: " + parameterValue);
    }
}

In the example above, use the request.getParameter(“parameterName”) method to retrieve a single request parameter value, and use the request.getParameterValues(“parameterName”) method to retrieve multiple request parameter values. These parameter values can then be used for subsequent logic processing.