标准库是 Java 加载/读取和编辑/修改和保存 html 文件而不重新格式化的最佳选择吗？
[英]Is the standard library my best option for Java to load/read and edit/modify and save a html file with no reformatting?
问题描述
I want to load/read and edit/modify and save a html file located on my hard drive.
我想加载/读取和编辑/修改并保存位于我的硬盘驱动器上的 html 文件。 I tried JSOUP , but it kept reformatting the html file.我试过JSOUP ，但它一直在重新格式化 html 文件。 I want to avoid reformating.我想避免重组。
I'm wanting to inject some JavaScript after the <script> and before var deviceReady = false;我想在<script>之后和var deviceReady = false; in the html file.在 html 文件中。
Do I need to parse the file?我需要解析文件吗？
Should I use default Java?我应该使用默认的 Java 吗？ (BufferedReader, FileReader, Scanner) (BufferedReader, FileReader, Scanner)
<!DOCTYPE html>
<html lang="en">
<head>
<meta name='viewport' content='initial-scale = 1, minimum-scale = 1, maximum-scale = 1'/>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=10">
<title>LX-XXX-KU</title>
<style type="text/css">#initialLoading{background:url(assets/htmlimages/loader.gif) no-repeat center
center;background-color:#ffffff;position:absolute;margin:auto;top:0;left:0;right:0;bottom:0;z-
index:10010;}</style>
"
<script>
var deviceReady = false;
var initCalled = false ;
var initialized = false;
function onBodyLoad()
{
if(typeof window.device === 'undefined')
{
document.addEventListener("deviceready", onDeviceReady, false);
}
else
{
onDeviceReady();
}
}
Javasacript I want to add after the <script> and before var deviceReady = false;我想在<script>之后和var deviceReady = false;之前添加 Javasacript
`//adds numbers to TOC
window.addEventListener( 'moduleReadyEvent', function ( e )
{
var myText = document.getElementsByClassName('tocText');
for ( var i = 0; i < myText.length; i++ )
{
var getText = myText[ i ].childNodes;
var str = ( i + 1 ) + ' ' + getText[ 0 ].innerHTML;
getText[ 0 ].innerHTML = str;
}
});`
2 个解决方案
解决方案1
1 2021-01-13 01:19:10
This can be accomplished like so:这可以像这样完成：
File f = ...;
String contents = new String(Files.readAllBytes(f));
int idx = contents.indexOf(insertBeforeStr);
contents = contents.substring(0, idx) + contentToBeAdded + contents.substring(idx + 1);
// write contents back to the disk.
解决方案2
1 2021-01-13 08:20:53
If you turn off jsoup's pretty printing option, and use the XML parser instead of the validating HTML parser, the document and all of its text verbatim, including whitespace, is passed through pretty much unmolested, other than syntax fixes for attributes, missing end tags, and the like.如果您关闭 jsoup 的漂亮打印选项，并使用XML 解析器而不是验证 HTML 解析器，则文档及其所有文本逐字逐句传递，包括空格，除了属性的语法修复，缺少结束标记，等等。
See for example your input on Try jsoup with pretty-printing off, and using the XML parser, is effectively the same as your original.例如，请参阅您在Try jsoup上的输入，并使用漂亮的打印关闭，并使用 XML 解析器，实际上与您的原始输入相同。
The code would be something like:代码将类似于：
Document doc = Jsoup.parse("<script>\nSomething(); ", "", Parser.xmlParser());
doc.outputSettings().prettyPrint(false);
Element scriptEl = doc.selectFirst("script");
DataNode scriptData = scriptEl.dataNodes().get(0);
scriptData.setWholeData(scriptData.getWholeData() + "\nanotherFunction();");
System.out.println(doc.html());
Gives us (note that there's no HTML structure automatically created, due to using the XML parser):给我们（请注意，由于使用了 XML 解析器，因此没有自动创建 HTML 结构）：
<script>
Something();
anotherFunction()</script>
ControlAltDel's answer definitely works and means you can do it with just the Java base library. ControlAltDel 的答案绝对有效，这意味着您只需使用 Java 基础库即可。 The benefit of using jsoup is (IMHO - as the author of jsoup) in this case is that you're not trying to string-match HTML, and won't get caught by eg a <script> in a comment, or in this case a missing close </script> tag, etc. But of course YMMV.在这种情况下，使用 jsoup 的好处是（恕我直言 - 作为 jsoup 的作者），您不会尝试对 HTML 进行字符串匹配，并且不会被例如评论中的<script>或在此情况下缺少关闭</script>标记等。但当然是 YMMV。
Incidentally, once jsoup 1.14.1 is released (soon!) with the change #1419 (which for script elements, proxies text settings into data without escaping), the code will simplify to:顺便说一句，一旦 jsoup 1.14.1 发布（很快！）并带有更改#1419 （对于脚本元素，将文本设置代理到数据中而不转义），代码将简化为：
Element scriptEl = doc.selectFirst("script");
scriptEl.appendText("\nanotherFunction()");
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