有關于 response.setContentType設定請求類型不生效的兩種解決方案

public String test(HttpServletRequest request, HttpServletResponse response) {
        response.setContentType("application/pdf");
        return  "true";
    }
           

問題:spring架構使用response.setContentType不生效?

解決辦法:

1. 改為無傳回值

   1. public void test(HttpServletRequest request, HttpServletResponse response) {
              response.setContentType("application/pdf");
              
          }
                 

2. 傳回值改為ResponseEntity<T>

   1. public ResponseEntity<String> test(HttpServletRequest request, HttpServletResponse response) {
              response.setContentType("application/pdf");
              return ResponseEntity.ok("true");
          }