有没有一种方法可以强制使用制表符代替Java中的空格？

<module name=\"RegexpSinglelineJava\">
    <property name=\"format\" value=\"^\\t* +\\t*\\S\"/>
    <property name=\"message\" value=\"Line has leading space characters; indentation should be performed with tabs only.\"/>
    <property name=\"ignoreComments\" value=\"true\"/>
</module>

public class SpaceDetectorTask extends Task {
    public static final String REGEX = \"^[ ]+\";
    public static final Pattern p = Pattern.compile(REGEX);

    private FileSet fileSet;
    private boolean failOnDetection;

    // Usual getters/setters

    public void addFileSet(FileSet fileSet) {
        this.fileSet = fileSet;
    }

    public void execute() {
        DirectoryScanner ds = fileSet.getDirectoryScanner();
        String[] files = ds.getIncludedFiles();
        for (int x = 0; x <= files.length -1; x++) {
            process(ds.getBasedir(), files[x]);
        }
    }

    public void process(File dir, String file) {
        try {
            BufferedReader reader = new BufferedReader(new FileReader(new File(dir, file)));
            String line;
            int linecount = 0;
            System.out.println(\"File: \" + file);
            boolean ignore = false;
            while((line = reader.readLine()) != null) {
                linecount++;

                // exclude comment blocks
                if (line.contains(\"/**\") || line.contains(\"*/\")) {
                    ignore = !ignore;
                    continue;
                }

                if (!ignore) {
                    if (p.matcher(line).find()) {
                        int spcCount = line.length() - (line.replaceAll(REGEX, \"\")).length();
                        if (spcCount >= 4) { // break whenever 4 leading spaces are detected. Configure as you need.
                            String msg = \"File: \"+ file + \" is using spaces as indentation.\";
                            if (failOnDetection) {
                                throw new BuildException(msg);
                            } else {
                                getProject().log(msg);
                            }
                        }
                    }
                    reader.close();
                }
            }
        } catch (IOException e) {
            if (failOnDetection) {
                throw new BuildException(e);
            } else {
                getProject().log(\"File: \" + file + \"\\n\" + e.getMessage());
            }
        }
    }

<taskdef name=\"detect-spaces\"
         classname=\"com.blah.blah.build.tools.SpaceDetectorTask\">
        <classpath>
            <pathelement path=\"${dir.classes}\"/>
            <fileset dir=\"C:/apache-ant-1.7.1/lib\">
                <include name=\"**/*.jar\"/>
            </fileset>
        </classpath>
</taskdef>

<target name=\"rules.spaces\">
    <detect-spaces
        failOnDetection=\"true\">
        <fileset dir=\"${dir.src.java}\">
            <include name=\"**/*.java\"/>
        </fileset>
    </detect-spaces>
</target>

^[ \\t]*

grep -e \"^\\t* \" `find . -name *.java`