需要从字符串中提取 3 个值

Question

I receive values like this from database table.

String DBValue = "AssessmentID-289_ApplicationName-OneCert_AccountName-9000032"

From this string I want to extract the values of AssessmentID, ApplicationName and AccountName and store it in these String variables "Assessment_ID","Application_Name" and "AccountName".

Note: I won't be able to do any changes in database.

Answer 1

String#split

Call String#split multiple times.

1. First split on the LOW LINE (underscore) character _ to get the three fields.
2. Then on each of those fields, call split on the HYPHEN-MINUS character - to split into two parts: field name and field value.

String dbValue = "AssessmentID-289_ApplicationName-OneCert_AccountName-9000032" ;
String[] fields = dbValue.split( "_" ) ;  // Produces "AssessmentID-289", "ApplicationName-OneCert", and "AccountName-9000032".
Map< String , String > results = new LinkedHashMap<>() ;
for( String field : fields )
{
    String[] parts = field.split( "-" ) ;   // Produces pairs "AssessmentID" & "289", "ApplicationName" & "OneCert", and "AccountName" & "9000032".
    if(parts.length >= 2) {
        results.put( parts[0] , parts[1] ) ;  // key is field name, value is field value.
    }
}

See this code run live at IdeOne.com .

results.toString(): {AssessmentID=289, ApplicationName=OneCert, AccountName=9000032}

If you make a method to perform this chore, I would suggest returning an unmodifiable map . Call Map.copyOf .

return Map.copyOf( results ) ;  // Return an unmodifiable map.

Better yet, in Java 16 and later, return a record . A record is a brief way to write a class whose main purpose is to transparently and immutably communicate data. The compiler implicitly creates the constructor, getters, equals & hashCode , and toString .

public record Assessment( String id , String applicationName , String accountName ) {}

Return an object of that type.

return new Assessment(
    results.get( "AssessmentID" ) ,
    results.get( "ApplicationName" ) ,
    results.get( "AccountName" ) 
) ;

In real work, I would throw in some calls to Objects.requireNonNull , verify the expected size of the map, and perform some other data validation.

---

Sounds like the source database was badly designed, burying multiple values within one field. Consider educating the responsible person about database normalization .