JAVA - 更改字符串格式

Question

JAVA - I have a file like the 1st one below, but I need it to look like the 2nd one to be inserted into a database later. Can someone help me figure out how to make it happen? I have tried using an array to read the file, but I can't get it to change the quotations correctly. The double to single quotations are key to be able to insert. Below is minus the asterisks.

1st: Red,Blue,Green,Yellow,"11,12,13,14,15,16",Orange
2nd: ,('Red','Blue','Green','Yellow','11,12,13,14,15,16','Orange','Date')

Answer 1

tl;dr

Read, and write, as Comma Separated Values (CSV) data.

Tip: Use a CSV-processing library such as Apache Commons CSV .

CSV file

Your text is in CSV format.

Use a library such as Apache Commons CSV to read and parse into Java objects. This has been addressed many many times on Stack Overflow, so search for more info and examples including entire example apps' source code.

Then write out those objects as text wrapped with the single quote marks. The CSV library may help there too, if it has options to force quote-enclosing on every element, and specify the kind of quote mark.

String input = "Red,Blue,Green,Yellow,\"11,12,13,14,15,16\",Orange";

try (
        Reader reader = new java.io.StringReader( input ) ;
)
{
    Iterable < CSVRecord > records = CSVFormat.RFC4180.parse( reader );
    for ( CSVRecord record : records )
    {
        // Dump to console.
        record.iterator().forEachRemaining( string -> System.out.println( string ) );
        // Write now data.
        StringBuilder builder = new StringBuilder( "(" );
        record.iterator().forEachRemaining( string -> builder.append( "'" ).append( string ).append( "'" ).append( "," ) ); // Leaves an extra comma at end.
        builder.deleteCharAt( builder.lastIndexOf( "," ) ); // Delete that extra comma at end.
        builder.append( ")" );
        System.out.println( "builder.toString() = " + builder.toString() );
    }
}
catch ( IOException e )
{
    e.printStackTrace();
}

When run:

Red
Blue
Green
Yellow
11,12,13,14,15,16
Orange
builder.toString() = ('Red','Blue','Green','Yellow','11,12,13,14,15,16','Orange')

---

But I suspect your greater goal of inserting into database is better served by properly using JDBC. Read on for details.

PreparedStatement::set…

You appear to be taking the wrong approach to working with JDBC.

Do not bother manipulating your text into being a SQL-compliant string. Do not pass your data arguments to SQL as a block of text.

Use a prepared statement to guard against SQL-injection attacks. Pass each data argument with a call to a set… command.

myPreparedStatement.setString( 1 , "Red" ) ; 

Of course you would be passing that Red text in a variable rather than a literal.