如何将字符串转换为 HTML 可读 ASCII 字符

Question

I am trying to convert Java String into HTML readable code.
For Example: H ello W o r ld as &#x48 &#x65 &#x6c &#x6c &#x6f &#x57 &#x6f &#x72 &#x6c &#x64

What I did so far:

    private static String convertToAscii(String str) {
        for(int i=0; i<str.length(); i++) {
            str += "&#"+(int)str.charAt(i);
        }
    return str;
    }

its taking too much time plus processor fan making noice.

Thanks in advance

Answer 1

This gif is not a perfect representation of what's happening here, but it gets the basic idea

Over here...

for(int i=0; i<str.length(); i++)

...You are looping through the String named str .

But here...

str += ...

...You are adding to str.

You are trying to get to the end of str, but you are literally adding to str for each loop. You have created an infinite loop.

Add to a different String. Like this.

   private static String convertToAscii(String str) {
   
      String output = "";
   
      for(int i=0; i<str.length(); i++) {
         output += "&#"+(int)str.charAt(i);
      }
         
      return output;
   
   }
   

Answer 2

You can also do something like that:

private static String convertToAscii(String str) { 
    return str     
              .chars() 
              .boxed()
              .reduce("", (subRes, currVal) -> subRes + "&#" + currVal + ";" , (subVal, mappedVal) -> subVal + "" + mappedVal);

Its quicker with Java >= 8