How to match a given string in a doc file and to copy all the paragraphs that contains the given string into another doc file

Question

I'm new to java programming and i have been working with this problem for the last 2 weeks.Somehow i managed to extract the paragraph from the doc file using getParagraphText() method.Now that I'm confused about finding a match with the given string and to copy all the paragraphs that contains the given string into another doc file.

Answer 1

First, you need to change your WriteDocFile method to accept a list of paragraphs because you want to print all matched paragraph (and change your method name to writeDocFile , java use camel case for method name)

public static void writeDocFile(List<String> paras) {
    XWPFDocument document = null;
    try {
        document = new XWPFDocument();
        FileOutputStream out = new FileOutputStream(new File("matchedpara.docx"));
        for (String para : paras) {
            XWPFParagraph paragraph = document.createParagraph();
            paragraph.setSpacingAfter(1);
            paragraph.createRun().setText(para);
        }
        document.write(out);
        out.close();
        System.out.println("matchedpara.docx written successfully");
    } catch (Exception er) {
        er.printStackTrace();
    }
    finally {
        try {
            if (document != null) {
                document.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

And in your main function, you already have paragraph list, so just use it to compare with the key, you don't have to read the file again (you can not use Scanner for reading doc file, though. It only work with text file)

// if you want to write empty string to doc file where there isn't any match
private static final List<String> NOT_ANY_MATCHED = new ArrayList<String>(){{ add(""); }}; 
if (paragraphs.length > 0) {
    List<String> matches = new ArrayList<>();
    for( String para : paragraphs ) {
        para = para.trim();
        if(para.contains(key)) { 
            matches.add(para);
        }
    }
    if (matches.size() > 0){
        writeDocFile(matches);
    }
    esle {
        writeDocFile(NOT_ANY_MATCHED);
    }
}