為了避免XSS攻擊, 也就是https://en.wikipedia.org/wiki/Cross-site_scripting
網站內的script會破壞頁面的擷取或是有惡意的行為
所以jsout提供了whitelist白名單的方法來處理
介紹如下
1. 官網https://jsoup.org/cookbook/cleaning-html/whitelist-sanitizer
2. 基本語法
Jsoup.clean(html來源, 白名單類型)
如果要自訂的話則自己宣告一個Whitelist
然後用.add("允許類型")來增加
範例如下
String unsafe = "<p><a href='http://example.com/' "
+ "onclick='stealCookies()'>Link</a></p>"
+ "<c>This is b</c>";
System.out.println( Jsoup.clean(unsafe, Whitelist.none()));
//LinkThis is b
System.out.println( Jsoup.clean(unsafe, Whitelist.basic()));
//<p><a href="http://example.com/" rel="nofollow">Link</a></p>This is b
Whitelist whitelist = new Whitelist();
whitelist.addTags("c");
System.out.println( Jsoup.clean(unsafe, whitelist));
//Link<c>This is b</c>
3. 其他常用的方法
Whitelist.none() :只允許包含文本信息
Whitelist.basic() :允許的標籤包括:a, b, blockquote, br, cite, code,
dd, dl, dt, em, i, li, ol, p, pre, q, small, strike,
strong, sub, sup, u, ul , 以及合適的屬性
Whitelist.simpleText() :允許b, em, i, strong, u 這些標籤
Whitelist.basicWithImages() 在basic() 上多了圖片
Whitelist.relaxed() 允許 :a, b, blockquote, br, caption,
cite, code, col, colgroup, dd, dl, dt, em, h1, h2, h3, h4,
h5, h6, i, img, li, ol, p, pre, q, small, strike, strong,
sub, sup, table, tbody, td, tfoot, th, thead, tr, u, ul
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