10.18

學習了異常處理，在處理使用者請求時，合理的異常處理能提升應用的穩定性。
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/exampleServlet")
public class ExampleServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// Some code that might throw an exception
int result = 10 / 0;
} catch (ArithmeticException e) {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("

An error occurred: " + e.getMessage() + "

");
}
}
}