java - 贾斯珀报告。文本所需的行数

Question

当我使用静态带（columnFooter）时，我需要计算在运行时适合文本所需的行数。

int rows = numberOfRows_Calculator((String) ContentText, (java.awt.Font) font, (Integer, in   pixels) columnWidth);

TextFieldBuilder<String> textFieldBuilderMyStaticBand = new ComponentBuilders().text(ContentText);
textFieldBuilderDisclaimer.setFixedRows(rows);

jasperReportBuilder.columnFooter(textFieldBuilderMyStaticBand);

Answer 1

最后，这是我的解决方案，我知道这不是完美的，因为我可以找到包含大于列宽的单词的字符串的问题......

private int numberOfRows_Calculator(String text, String fontName, int fontSize, int fontStyle, int columnWidth) {

    FontRenderContext context = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB).createGraphics().getFontRenderContext();
    java.awt.Font font = new Font(fontName, fontStyle, fontSize);
    double width;
    int numberOfRows = 0;

    int breakLineIndex;
    boolean continuee = true;
    String subtext = text;
    String breaklineString = System.getProperty("line.separator");
    int breaklineLength = breaklineString.length();

    do {
        breakLineIndex = subtext.indexOf(breaklineString);
        if (breakLineIndex > -1) {
            width = font.getStringBounds(subtext.substring(0, breakLineIndex), context).getWidth();
            numberOfRows = numberOfRows + (int) (width / columnWidth) + 1;
            subtext = subtext.substring(breakLineIndex + breaklineLength, subtext.length());
        } else {
            width = font.getStringBounds(subtext, context).getWidth();
            numberOfRows = numberOfRows + (int) (width / columnWidth) + 1;
            continuee = false;
        }
    } while (continuee);

    return numberOfRows;
}