1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4. import java.net.HttpURLConnection;
  5. import java.net.URL;
  7. public class RequestConverter {
  9. public static void main(String[] args) {
  10. String requestType = args[0]; // GET, POST, PUT, DELETE
  11. String url = args[1]; // URL to request
  12. String requestBody = args[2]; // Request body (for POST, PUT)
  14. try {
  15. HttpURLConnection connection = makeRequest(requestType, url, requestBody);
  16. printResponse(connection);
  17. } catch (IOException e) {
  18. System.err.println("Error: " + e.getMessage());
  19. } finally {
  20. if (connection != null) {
  21. connection.disconnect();
  22. }
  23. }
  24. }
  26. private static HttpURLConnection makeRequest(String requestType, String url, String requestBody) throws IOException {
  27. URL u = new URL(url);
  28. HttpURLConnection connection = (HttpURLConnection) u.openConnection();
  29. connection.setInstance(HttpURLConnection.HTTP_BROWSER); //For non-production
  31. switch (requestType.toUpperCase()) {
  32. case "GET":
  33. connection.connect(); // Connect for GET requests
  34. break;
  35. case "POST":
  36. connection.setDoOutput(true);
  37. connection.setDoInput(true);
  38. connection.setRequestMethod("POST");
  39. if (requestBody != null && !requestBody.isEmpty()) {
  40. connection.getOutputStream().write(requestBody.getBytes());
  41. }
  42. break;
  43. case "PUT":
  44. connection.setDoOutput(true);
  45. connection.setDoInput(true);
  46. connection.setRequestMethod("PUT");
  47. if (requestBody != null && !requestBody.isEmpty()) {
  48. connection.getOutputStream().write(requestBody.getBytes());
  49. }
  50. break;
  51. case "DELETE":
  52. connection.setRequestMethod("DELETE");
  53. break;
  54. default:
  55. throw new IllegalArgumentException("Invalid request type: " + requestType);
  56. }
  58. return connection;
  59. }
  61. private static void printResponse(HttpURLConnection connection) throws IOException {
  62. BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
  63. StringBuilder response = new StringBuilder();
  64. String line;
  65. while ((line = reader.readLine()) != null) {
  66. response.append(line).append("\n");
  67. }
  68. System.out.println(response.toString());
  69. }
  70. }

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