I am managing to parse most of the data I need except for one as it is contained within the a href tag and I am needing the number that appears after "mmsi="
<a href="/showship.php?mmsi=235083844">Sunsail 4013</a>
my current parser fetches all the other data I need and is below. I tried a few things out the code commented out returns unspecified occasionally for an entry. Is there any way I can add to my code below so that when the data is returned the number "235083844" returns before the name "Sunsail 4013"?
try {
File input = new File("shipMove.txt");
Document doc = Jsoup.parse(input, null);
Elements tables = doc.select("table.shipInfo");
for( Element element : tables )
{
Elements tdTags = element.select("td");
//Elements mmsi = element.select("a[href*=/showship.php?mmsi=]");
// Iterate over all 'td' tags found
for( Element td : tdTags ){
// Print it's text if not empty
final String text = td.text();
if( text.isEmpty() == false )
{
System.out.println(td.text());
}
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Example of data parsed and html file here
attr
on an Element
object to retrieve a particular attribute's value substring
to get the required value if the String pattern is consistent Code
// Using just your anchor html tag
String html = "<a href=\"/showship.php?mmsi=235083844\">Sunsail 4013</a>";
Document doc = Jsoup.parse(html);
// Just selecting the anchor tag, for your implementation use a generic one
Element link = doc.select("a").first();
// Get the attribute value
String url = link.attr("href");
// Check for nulls here and take the substring from '=' onwards
String id = url.substring(url.indexOf('=') + 1);
System.out.println(id + " "+ link.text());
Gives,
235083844 Sunsail 4013
Modified condition in your for
loop from your code:
...
for (Element td : tdTags) {
// Print it's text if not empty
final String text = td.text();
if (text.isEmpty() == false) {
if (td.getElementsByTag("a").first() != null) {
// Get the attribute value
String url = td.getElementsByTag("a").first().attr("href");
// Check for nulls here and take the substring from '=' onwards
String id = url.substring(url.indexOf('=') + 1);
System.out.println(id + " "+ td.text());
}
else {
System.out.println(td.text());
}
}
}
...
The above code would print the desired output.
If you need value of attribute, you should use attr()
method.
for( Element td : tdTags ){
Elements aList = td.select("a");
for(Element a : aList){
String val = a.attr("href");
if(StringUrils.isNotBlank(val)){
String yourId = val.substring(val.indexOf("=") + 1);
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.