用Java解码URI查询字符串 [英] Decoding URI query string in Java

问题描述

我需要解码包含查询字符串的URI;预期的输入/输出行为类似于以下内容：

I need to decode a URI that contains a query string; expected input/output behavior is something like the following:

abstract class URIParser
{       
    /** example input: 
      * something?alias=pos&FirstName=Foo+A%26B%3DC&LastName=Bar */
    URIParser(String input) { ... }
    /** should return "something" for the example input */
    public String getPath(); 
    /** should return a map 
      * {alias: "pos", FirstName: "Foo+A&B=C", LastName: "Bar"} */
    public Map<String,String> getQuery();
}

我尝试过使用 java.net.URI ，但它似乎解码查询字符串所以在上面的例子我留下了alias = pos& FirstName = Foo + A& B = C& LastName = Bar，所以有一个&的含糊不清是一个查询分隔符，或者是查询组件中的一个字符。

I've tried using java.net.URI, but it seems to decode the query string so in the above example I'm left with "alias=pos&FirstName=Foo+A&B=C&LastName=Bar" so there is ambiguity whether a "&" is a query separator or is a character in a query component.

编辑：我刚试过 URI.getRawQuery（）它没有做编码，所以我可以用& 拆分查询字符串，但那我该怎么办？ Javascript有 decodeURIComponent ，我似乎无法找到相应的方法在Java。

I just tried URI.getRawQuery() and it doesn't do the encoding, so I can split the query string with a &, but then what do I do? Javascript has decodeURIComponent, I can't seem to find the corresponding method in Java.

有什么建议吗？我不想使用任何新库。

Any suggestions? I would prefer not to use any new libraries.

推荐答案

参见class URLDecoder

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