java 将包含 ASCII 的字符串转换为 Unicode
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Convert a string containing ASCII to Unicode
提问by Rob Hufschmitt
I get a string from my HTML page into my Java HTTPServlet. On my request I get ASCII codes that display Chinese characters:
我从我的 HTML 页面获取一个字符串到我的 Java HTTPServlet 中。根据我的要求，我得到了显示汉字的 ASCII 代码：
"& #21487;& #20197;& #21578;& #35785;& #25105;" (without the spaces)
“可以告诉我” （没有空格）
How can I transform this string into Unicode?
如何将此字符串转换为 Unicode？
HTML code:
HTML代码：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Find information</title>
<link rel="stylesheet" type="text/css" href="layout.css">
</head>
<body>
<form id="lookupform" name="lookupform" action="LookupServlet" method="post" accept-charset="UTF-8">
<table id="lookuptable" align="center">
<tr>
<label>Question:</label>
<td><textarea cols="30" rows="2" name="lookupstring" id="lookupstring"></textarea></td>
</tr>
</table>
<input type="submit" name="Look up" id="lookup" value="Look up"/>
</form>
Java code:
爪哇代码：
request.setCharacterEncoding("UTF-8");
javax.servlet.http.HttpSession session = request.getSession();
LoginResult lr = (LoginResult) session.getAttribute("loginResult");
String[] question = request.getParameterValues("lookupstring");
If I print question[0] then I get this value: "& #21487;& #20197;& #21578;& #35785;& #25105;"
如果我打印 question[0] 然后我得到这个值：“& #21487;& #20197;& #21578;& #35785;& #25105;”
回答by Pablo Santa Cruz
There is no such thing as ASCIIcodes that display Chinese characters. ASCII does not represent Chinese characters.
没有ASCII显示汉字的代码。ASCII 不代表汉字。
If you already have a Java string, it already has an internal representation of all characters (US, LATIN, CHINESE). You can then encodethat Java string into Unicode using UTF-8or UTF-16representations:
如果您已经有一个 Java 字符串，那么它已经具有所有字符（美国、拉丁语、中文）的内部表示。然后，您可以使用UTF-8或UTF-16表示将该 Java 字符串编码为 Unicode ：
String s = "可以告诉我";(EDIT: This line won't display correctly on systems not having fonts for Chinese characters)
String s = "可以告诉我";（编辑：此行在没有汉字字体的系统上无法正确显示）
String s = "\u53ef\u4ee5\u544a\u8bc9\u6211";
byte utfString = s.getBytes("UTF-8");
Now that I look at your updated question, you might be looking for the StringEscapeUtilsclass. It's from Apache Commons Text. And will unescapeyour HTML entities into a Java string:
现在我查看了您更新的问题，您可能正在寻找StringEscapeUtils类。它来自 Apache Commons Text。并将您的 HTML 实体转义为 Java 字符串：
String s = StringEscapeUtils.unescapeHtml("& #21487;& #20197;& #21578;& #35785;& #25105;"); // without spaces
回答by Thorbj?rn Ravn Andersen
A Java String contains unicode characters. The decoding has taken place when the string was constructed.
Java 字符串包含 unicode 字符。构造字符串时已进行解码。
