package web.demo;
import java.io.IOException;
import java.io.PrintWriter;
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("/hello")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 設定回應的內容型態 (告訴瀏覽器要用UTF-8顯示HTML)
response.setContentType("text/html; charset=UTF-8");
// 建立 PrintWriter，回應給前端
PrintWriter out = response.getWriter();
// 輸出 HTML 內容
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Hello Servlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>哈囉！這是我的第一個Servlet輸出</h1>");
// 可以接收 request 的參數
String name = request.getParameter("name");
if (name != null && !name.isEmpty()) {
out.println("<p>你好, " + name + "！</p>");
} else {
out.println("<p>你沒有傳入 name 參數</p>");
}
out.println("</body>");
out.println("</html>");
// 結束 PrintWriter
out.close();
}
}
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