在jsoup中获取html字符串中的所有属性

Question

I have string in HTML format and i am trying to get all the attributes and its values using Jsoup.

String is

String string= 
"<button class=submit btn primary-btn flex-table-btn js-submit type=submit>Sign in</button>";

 Document doc = Jsoup.parse(string);
    try {
        org.jsoup.nodes.Attributes attrs = doc.attributes();

        for( org.jsoup.nodes.Element element : doc.getAllElements() )
        {
              for( Attribute attribute : element.attributes() )
              {
                  System.out.println( attribute.getKey() +  " --::-- "+attribute.getValue()  ); 
              }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

My desired output is ::

key: **class** , Value is: **submit btn primary-btn flex-table-btn js-submit**

key: **type** , Value is: **submit**

But what I get is this

key: class , Value is: submit key: btn , Value is: key: primary-btn , Value is: key: flex-table-btn , Value is: key: js-submit , Value is: key: type , Value is: submit

This is because of the quotes. If I use

String string= 
"<button class='submit btn primary-btn flex-table-btn js-submit' type='submit'>       Sign in</button>";

I will get my desired output.But I am trying to get without quotes.

Answer 1

You can't do it without the quotes, because the quotes are not optional. Without the quotes, the HTML you've quoted describes an element with one class ( submit ) and a series of non-class, invalid additional attributes with names like btn , flex-table , etc., and that's how any browser will interpret it, just as JSoup is doing. If those are meant to be additional classes on the element, quotes are required .

From the specification :

Unquoted attribute value syntax

The attribute name, followed by zero or more space characters, followed by a single U+003D EQUALS SIGN character, followed by zero or more space characters, followed by the attribute value, which, in addition to the requirements given above for attribute values, must not contain any literal space characters , any U+0022 QUOTATION MARK characters ("), U+0027 APOSTROPHE characters ('), "=" (U+003D) characters, "<" (U+003C) characters, ">" (U+003E) characters, or U+0060 GRAVE ACCENT characters (`), and must not be the empty string.

Note that "must not contain any literal space characters" part I've emphasized.

Answer 2

It's simple with Jsoup :

Document doc = Jsoup.parse(HTML);
List<String> tags = new ArrayList<String>(); //record tags

for(Element e : doc.getAllElements()){      // all elements in html

    tags.add(e.tagName().toLowerCase());    // add each tag in tags List
    //System.out.println("Tag: "+ e.tag()+" attributes = "+e.attributes());  // attributes with values in string
    //System.out.println("Tag: "+ e.tag()+" attributes = "+e.attributes().asList()); //attributes in List<Attribute>

    for(Attribute att : e.attributes().asList()){ // for each tag get all attributes in one List<Attribute>
        System.out.print("Key: "+att.getKey()+ " , Value: "+att.getValue());
        System.out.println();
    }
}

System.out.println("*****************");
System.out.println("All Tags = "+tags);
System.out.println("Distinct Tags = "+ new HashSet<String>(tags));