java 查询字符串中 Hash(#) 的行为是什么
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What is the behavior of Hash(#) in query string
提问by Shekhar Khairnar
I am sending the below url with query string. In the query string one parameter "approverCmt" has value with hash(#).
我正在发送带有查询字符串的以下网址。在查询字符串中，一个参数“approverCmt”的值为 hash(#)。
"/abc/efd/xyz.jas?approverCmt=Transaction Log #459505&batchNm=XS_10APR2015_082224&mfrNm=Timberland"
In server side when I tried to retrieve it from the request I get
在服务器端，当我试图从我得到的请求中检索它时
approverCmt = Transaction Log -----> "#459505" is missing
batchNm = null
mfrNm = null
And If I remove hash(#) from query string or If I replace # with %23 every thing works fine
如果我从查询字符串中删除 hash(#) 或者如果我用 %23 替换 # 一切正常
I don't understand why I am getting null for one parameter if another parameter contains a hash(#) symbol.
如果另一个参数包含哈希（#）符号，我不明白为什么我会为一个参数获取空值。
Appreciate if any one can explain.
不胜感激，如果有人可以解释。
回答by Prashant
This is known as the "fragment identifier".
这被称为“片段标识符”。
As mentioned in wikipedia:
正如维基百科中提到的：
The
fragment identifierintroduced by a hash mark # is the optional last part of aURLfor a document. It is typically used to identify a portion of that document.
在
fragment identifier由井号＃介绍的是一个可选的最后一部分URL为一个文件。它通常用于标识该文档的一部分。
The part after the #is info for the client. It is not sent to the server. Put everything only the browser needs here.
之后的部分#是 的信息client。它不会发送到服务器。把浏览器需要的所有东西都放在这里。
You can use the encodeURIComponent()function in JavaScript to encode special characters in a URL, so that #characters are converted to other characters that way you can be sure your whole URL will be sent to the server.
您可以使用encodeURIComponent()JavaScript 中的函数对 URL 中的特殊字符进行编码，以便将#字符转换为其他字符，这样您就可以确保将整个 URL 发送到服务器。
回答by pdem
The Hash value is for the anchor, so it is only client-side, it is often used in client-side framework like angular for client-side routing.
Hash 值是针对锚点的，所以它只是客户端，它经常用于客户端框架中，例如用于客户端路由的 angular。
The anchor is NOT available server-side.
锚点在服务器端不可用。
In your case you don't need an anchor, but a parameter value with a # break the query string the value is "Transaction Log #459505".
在您的情况下，您不需要锚点，但需要带有#break 查询字符串的参数值，该值是“事务日志#459505”。
EDIT Naive solution that doesn't work, just let it ther for history, See Real solution below
编辑不起作用的天真解决方案，让它成为历史，请参阅下面的真实解决方案
The solution is to encode client-side and decode serveur-side
解决方案是对客户端进行编码并在服务端进行解码
Encoding in javascript
在javascript中编码
encodeURI("Transaction Log #459505")
//result value "Transaction%20Log%20#459505"
Decode in Java
用Java解码
java.net.URLDecoder.decode("Transaction%20Log%20#459505");
//result "Transaction Log #459505"
EDIT: But: Javascript doesn't encode in the same way than Java So the correct answer (I hope) is to manually replace all your # with %23, then Java will decode it normally, or to use encodeURIComponent as suggested in comments. For your need the replace solution seem to be enough.
编辑：但是：Javascript 的编码方式与 Java 不同所以正确的答案（我希望）是手动将所有 # 替换为 %23，然后 Java 将对其进行正常解码，或者按照注释中的建议使用 encodeURIComponent。对于您的需要，更换解决方案似乎就足够了。
Encode in Javascript:
在 Javascript 中编码：
encodeURI("yourUrl/Transaction Log #459505").replace(/#/,"%23")
//result: yourUrl/Transaction%20Log%20%23459505
The decode in Java doesn't change
Java 中的解码不会改变
java.net.URLDecoder.decode("Transaction%20Log%20#459505")
// result (java.lang.String) Transaction Log #459505
Sorry for long post, I didn't see the difference bettween Java and the JavaScrip Url encoding
抱歉长篇幅，我没有看到 Java 和 JavaScrip Url 编码之间的区别
