def lines1 = Files.readAllLines(file1,Charset.forName("GBK")).toList() def lines2 = Files.readAllLines(file2,Charset.forName("GBK")).toList() def diff = DiffUtils.diff(lines1, lines2) if (!diff.getDeltas().isEmpty()) { // Differences found, generate HTML report def html = DiffUtils.htmlDiff(lines1, lines2) def diffFile = diffOutputFolder.resolve("${file1.fileName}-diff.html") } 改写这段代码，使其不报下面的错：Reason: groovy.lang.MissingMethodException: No signature of method: static com.github.difflib.DiffUtils.htmlDiff() is applicable for argument types: (java.util.ArrayList, java.util.ArrayList) values: [["ID","NAME","NAME","EMAIL", "011","John","22","John@email.com", ...], ...]

如果使用 `Charset.forName("GBK")` 读取文件，可能会因为编码问题导致 `htmlDiff()` 方法报错。为了避免这种问题，可以先将文件内容转换为 UTF-8 编码再使用 `htmlDiff()` 方法。

可以使用以下代码来转换文件内容：

def lines1 = Files.readAllLines(file1, Charset.forName("GBK"))
def lines2 = Files.readAllLines(file2, Charset.forName("GBK"))
def utf8Lines1 = lines1.collect { it.getBytes("UTF-8") }.collect { new String(it, "UTF-8") }
def utf8Lines2 = lines2.collect { it.getBytes("UTF-8") }.collect { new String(it, "UTF-8") }

def diff = DiffUtils.diff(utf8Lines1, utf8Lines2)

if (!diff.getDeltas().isEmpty()) {
    // Differences found, generate HTML report
    def html = DiffUtils.htmlDiff(utf8Lines1, utf8Lines2)
    def diffFile = diffOutputFolder.resolve("${file1.fileName}-diff.html")
    Files.write(diffFile, html.getBytes())
}

这样，就可以将文件内容转换为 UTF-8 编码，避免 `htmlDiff()` 方法报错了。