Question

我们使用iTextSharp开发了一个PDF阅读器桌面应用程序，我们正在开发一个Android应用程序。这是我的C＃代码我想知道Java中的StringComparison可以使用什么

public final void PDFReferenceGetter(String pSearch, StringComparison SC, String sourceFile, String destinationFile)
{
    //
}

完整代码

public final void PDFReferenceGetter(String pSearch, String SC, String sourceFile, String destinationFile)
{
    PdfStamper stamper = null;
    PdfContentByte contentByte;
    Rectangle refRectangle = null;

    int refPage = 0;

    //this.Cursor = Cursors.WaitCursor;

    if ((new java.io.File(sourceFile)).isFile())
    {
        PdfReader pReader = new PdfReader(sourceFile);

        stamper = new PdfStamper(pReader, new FileOutputStream(destinationFile));

        for (int page = 1; page <= pReader.getNumberOfPages(); page++)
        {
            LocationTextExtractionStrategy strategy = new LocationTextExtractionStrategy();
            contentByte = stamper.getUnderContent(page);

            //Send some data contained in PdfContentByte, looks like the first is always cero for me and the second 100, but i'm not sure if this could change in some cases
            strategy._UndercontentCharacterSpacing = contentByte.getCharacterSpacing();
            strategy._UndercontentHorizontalScaling = contentByte.getHorizontalScaling();

            //It's not really needed to get the text back, but we have to call this line ALWAYS, 
            //because it triggers the process that will get all chunks from PDF into our strategy Object
            String currentText = PdfTextExtractor.getTextFromPage(pReader, page, strategy);

            //The real getter process starts in the following line
            java.util.ArrayList<Rectangle> matchesFound = strategy.GetTextLocations("References", SC);

            //Set the fill color of the shapes, I don't use a border because it would make the rect bigger
            //but maybe using a thin border could be a solution if you see the currect rect is not big enough to cover all the text it should cover
            contentByte.setColorFill(BaseColor.PINK);

            //MatchesFound contains all text with locations, so do whatever you want with it, this highlights them using PINK color:s
            for (Rectangle rect : matchesFound)
            {
                refRectangle = rect;
                refPage = page;
            }
            contentByte.fill();

        }

        for (int page = 1; page <= pReader.getNumberOfPages(); page++)
        {
            LocationTextExtractionStrategy strategy = new LocationTextExtractionStrategy();
            contentByte = stamper.getUnderContent(page);

            //Send some data contained in PdfContentByte, looks like the first is always cero for me and the second 100, but i'm not sure if this could change in some cases
            strategy._UndercontentCharacterSpacing = contentByte.getCharacterSpacing();
            strategy._UndercontentHorizontalScaling = contentByte.getHorizontalScaling();

            //It's not really needed to get the text back, but we have to call this line ALWAYS, 
            //because it triggers the process that will get all chunks from PDF into our strategy Object
            String currentText = PdfTextExtractor.getTextFromPage(pReader, page, strategy);

            String text    = currentText;
            String patternString = pSearch;
            Pattern pattern = Pattern.compile(patternString);

            Matcher matcher = pattern.matcher(text);
            boolean matches = matcher.matches();

            if(matches == true)
            {
            ArrayList<String> mc;
            mc.add(text);

            //MatchCollection mc = Regex.Matches(currentText, pSearch);
            java.util.ArrayList<Rectangle> matchesFound = new java.util.ArrayList<Rectangle>();
            for (String m : mc)
            {
                matchesFound = strategy.getTextLocations(m.toString(), SC);

                for (Rectangle rect : matchesFound)
                {
                    contentByte.rectangle(rect.getLeft(), rect.getBottom(), rect.getWidth(), rect.getHeight());

                    PdfDestination pdfdest = new PdfDestination(PdfDestination.XYZ, refRectangle.LEFT, refRectangle.TOP, 0);
                    PdfAnnotation annot = PdfAnnotation.createLink(stamper.getWriter(), rect, PdfAnnotation.HIGHLIGHT_INVERT, refPage, pdfdest);
                    stamper.addAnnotation(annot, page);
                }
            }

            //The real getter process starts in the following line
            //Set the fill color of the shapes, I don't use a border because it would make the rect bigger
            //but maybe using a thin border could be a solution if you see the currect rect is not big enough to cover all the text it should cover
            contentByte.setColorFill(BaseColor.LIGHT_GRAY);

            //MatchesFound contains all text with locations, so do whatever you want with it, this highlights them using PINK color:

            contentByte.fill();

        }

        stamper.close();
        pReader.close();
    }
    //this.Cursor = Cursors.Default;
    }
}

Answer 1

更详细地描述StringComparison枚举here。

简而言之，遗憾的是，java库中没有合适的类型。

简单的解决方案

创建自己的Java枚举镜像c＃。您还必须创建自己的字符串比较方法，并考虑StringComparison，例如忽略大小写等，取决于StringComparison的值。

最佳解决方案

我会避免在方法的界面中使用StringComparison。而是搜索方法的用法。我猜它只是用来有时候会忽略大小写而不是其他的。或者它完全未使用。对于后一种情况 - 只需删除它就可以了！对于前一种情况，只需将bool传递给界面！请记住更新c＃代码以使端口保持同步。

Answer 2

如果您有一个字符串：

String myString = "somestring";

还有一个：

String anotherString = "somestringelse";

您可以使用内置的equals()函数，如下所示：

if(myString.equals(anotherString)) {
 //Do code
}

Answer 3

您可以使用基本的Java字符串比较方法

如果你想完全比较两个字符串，我的意思是整个字符串

字符串string1 =＆＃34; abcd＆＃34;，string2 =＆＃34; abcd＆＃34 ;;

if（string1.equals（string2））----＆gt;返回true，因为它们相等，否则返回false。

如果你想比较两个字符串完全忽略它们的情况，你可以使用以下方法

String string1 =＆＃34; abcd＆＃34;，string2 =＆＃34; AbCd＆＃34;;

if（string1.equalsIgnorecase（string2）） - ＆gt;虽然它们的情况不同，但返回true，因为它们是相同的，否则返回false。

如果您不想比较整个字符串，可以使用以下方法

检查Java中所有字符串比较方法的以下链接

http://docs.oracle.com/javase/tutorial/java/data/comparestrings.html

java中的StringComparison

3 个答案:

简单的解决方案

最佳解决方案