output: #fixed code
                                  @Test
      public void test() throws Exception {
          for (int i = 0; i < 5; i++) {
              SpecCaptcha specCaptcha = new SpecCaptcha();
              //specCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);
              System.out.println(specCaptcha.text());
              //specCaptcha.out(new FileOutputStream(new File("D:/Java/aa" + i + ".png")));
          }
      }
input: #vulnerable code 
                                  @Test
      public void test() throws Exception {
          for (int i = 0; i < 5; i++) {
              SpecCaptcha specCaptcha = new SpecCaptcha();
              //specCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);
              System.out.println(specCaptcha.text());
              specCaptcha.out(new FileOutputStream(new File("D:/Java/aa" + i + ".png")));
          }
      } 
                              #location 7 
                              #vulnerability type RESOURCE_LEAK