blocks|key|27987|text|见URLDecoder类|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|27988|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/java/net/URLDecoder.html#URLDecoder%2528%2529^0|1|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

See class <a href="http://docs.oracle.com/javase/7/docs/api/java/net/URLDecoder.html#URLDecoder%28%29" rel="noreferrer">URLDecoder</a>

blocks|key|28013|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|28014|URLDecoder.decode(proxyRequestParam.replace("%2B",+"%252B"),+"UTF-8")
++++++++++.replace("%252B",+"%2B")|code-block|syntax|javascript|28015|来模拟decodeURIComponent。Java的URLDecoder将加号解码为空格，这不是您想要的，因此您需要替换语句。|offset|length|style|CODE|28016|警告:如@xehpuk所指出的那样，如果原始数据(pre+form-urlencoded)包含该字符串，则末尾的+.replace("%252B",+"%2B")将破坏您的数据。|blockquote|BOLD|28017|entityMap^0|0|0|3|I|R|A|0|0|1K|1L|K|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|O|7|Z|8|@$I|10|J|11|K|P]|$I|12|J|13|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|R|$]]

Use 

<pre><code>URLDecoder.decode(proxyRequestParam.replace("+", "%2B"), "UTF-8")
 .replace("%2B", "+")
</code></pre>

to simulate <code>decodeURIComponent</code>. Java's <code>URLDecoder</code> decodes the plus sign to a space, which is not what you want, therefore you need the replace statements.

<blockquote>
 Warning: the <code>.replace("%2B", "+")</code> at the end will corrupt your data if the original (pre-x-www-form-urlencoded) contained that string, as @xehpuk pointed out.
</blockquote>

blocks|key|1318197|text|var+reqParam+=++URLDecoder.decode(reqParam,+"UTF-8")|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1318198|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var reqParam = URLDecoder.decode(reqParam, "UTF-8")
</code></pre>

blocks|key|1577834|text|关于%2B符号的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1577835|我创建了一个基于@janb的回答包装URLDecoder函数的帮助类|1577836|import+android.net.Uri;
import+android.support.annotation.Nullable;
import+android.text.TextUtils;

import+java.io.UnsupportedEncodingException;
import+java.net.URLDecoder;
import+java.text.SimpleDateFormat;
import+java.util.Date;
import+java.util.Locale;

public+class+DateDecoder+{

++++private+static+final+String+KEY_DATE+=+"datekey";

++++private+static+final+SimpleDateFormat+SIMPLE_DATE_FORMAT+=
++++++++++++new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZZ",+Locale.US);


++++public+static+void+main(String[]+args)+throws+UnsupportedEncodingException+{
++++++++try+{
++++++++++++Uri+uri+=+Uri.parse("http://asdf.com?something=12345&"+%2B
++++++++++++++++++++KEY_DATE+%2B"=2016-12-24T12:00:00%2B01:00");

++++++++++++System.out.println("parsed+date:+"+%2B+DateDecoder.createDate(uri));+//+parsed+date:+Sat+Dec+24+12:00:00+GMT%2B01:00+2016
++++++++}+catch+(Exception+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}

++++@Nullable
++++public+static+Date+createDate(@Nullable+Uri+data)+{
++++++++if+(data+!=+null)+{
++++++++++++try+{
++++++++++++++++String+withPlus+=+decodeButKeepPlus(KEY_DATE,+data.getEncodedQuery());
++++++++++++++++if+(!TextUtils.isEmpty(withPlus))+{
++++++++++++++++++++return+SIMPLE_DATE_FORMAT.parse(withPlus);
++++++++++++++++}
++++++++++++}+catch+(Exception+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++}
++++++++}
++++++++return+null;
++++}

++++/**
+++++*+copied+from+android.net.Uri.java
+++++*/
++++@Nullable
++++public+static+String+decodeButKeepPlus(String+encodedKey,+String+completeEncodedQuery)
++++++++++++throws+UnsupportedEncodingException+{

++++++++final+int+length+=+completeEncodedQuery.length();
++++++++int+start+=+0;
++++++++do+{
++++++++++++int+nextAmpersand+=+completeEncodedQuery.indexOf('&',+start);
++++++++++++int+end+=+nextAmpersand+!=+-1+?+nextAmpersand+:+length;

++++++++++++int+separator+=+completeEncodedQuery.indexOf('=',+start);
++++++++++++if+(separator+>+end+%7C%7C+separator+==+-1)+{
++++++++++++++++separator+=+end;
++++++++++++}

++++++++++++if+(separator+-+start+==+encodedKey.length()
++++++++++++++++++++&&+completeEncodedQuery.regionMatches(start,+encodedKey,+0,+encodedKey.length()))+{
++++++++++++++++if+(separator+==+end)+{
++++++++++++++++++++return+"";
++++++++++++++++}+else+{
++++++++++++++++++++String+encodedValue+=+completeEncodedQuery.substring(separator+%2B+1,+end);
++++++++++++++++++++if+(!TextUtils.isEmpty(encodedValue))+{
++++++++++++++++++++++++return+URLDecoder.decode(encodedValue.replace("%2B",+"%252B"),+"UTF-8").replace("%252B",+"%2B");
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}

++++++++++++//+Move+start+to+end+of+name.
++++++++++++if+(nextAmpersand+!=+-1)+{
++++++++++++++++start+=+nextAmpersand+%2B+1;
++++++++++++}+else+{
++++++++++++++++break;
++++++++++++}
++++++++}+while+(true);
++++++++return+null;
++++}

}|code-block|syntax|javascript|1577837|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Regarding the issue with the + sign :

I made a helper class that wraps the URLDecoder function based on the answer of @janb

<pre><code>import android.net.Uri;
import android.support.annotation.Nullable;
import android.text.TextUtils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class DateDecoder {

 private static final String KEY_DATE = "datekey";

 private static final SimpleDateFormat SIMPLE_DATE_FORMAT =
 new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZZ", Locale.US);


 public static void main(String[] args) throws UnsupportedEncodingException {
 try {
 Uri uri = Uri.parse("http://asdf.com?something=12345&amp;" +
 KEY_DATE +"=2016-12-24T12:00:00+01:00");

 System.out.println("parsed date: " + DateDecoder.createDate(uri)); // parsed date: Sat Dec 24 12:00:00 GMT+01:00 2016
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

 @Nullable
 public static Date createDate(@Nullable Uri data) {
 if (data != null) {
 try {
 String withPlus = decodeButKeepPlus(KEY_DATE, data.getEncodedQuery());
 if (!TextUtils.isEmpty(withPlus)) {
 return SIMPLE_DATE_FORMAT.parse(withPlus);
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 return null;
 }

 /**
 * copied from android.net.Uri.java
 */
 @Nullable
 public static String decodeButKeepPlus(String encodedKey, String completeEncodedQuery)
 throws UnsupportedEncodingException {

 final int length = completeEncodedQuery.length();
 int start = 0;
 do {
 int nextAmpersand = completeEncodedQuery.indexOf('&amp;', start);
 int end = nextAmpersand != -1 ? nextAmpersand : length;

 int separator = completeEncodedQuery.indexOf('=', start);
 if (separator &gt; end || separator == -1) {
 separator = end;
 }

 if (separator - start == encodedKey.length()
 &amp;&amp; completeEncodedQuery.regionMatches(start, encodedKey, 0, encodedKey.length())) {
 if (separator == end) {
 return "";
 } else {
 String encodedValue = completeEncodedQuery.substring(separator + 1, end);
 if (!TextUtils.isEmpty(encodedValue)) {
 return URLDecoder.decode(encodedValue.replace("+", "%2B"), "UTF-8").replace("%2B", "+");
 }
 }
 }

 // Move start to end of name.
 if (nextAmpersand != -1) {
 start = nextAmpersand + 1;
 } else {
 break;
 }
 } while (true);
 return null;
 }

}
</code></pre>

blocks|key|1577856|text|new+java.net.URI(proxyRequestParam).getPath()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1577857|js+encodeURIComponent编码的字符串应该只是一个路径，而不是模式和其他东西。但是对于java.net.URI来说，它仍然是一个有效的输入，所以java.net.URI会为我们做所有的事情，然后它的路径就是我们想要的。|unstyled|1577858|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>new java.net.URI(proxyRequestParam).getPath()
</code></pre>

The string encoded by js encodeURIComponent should just be a path, without schema and other things. However it still a valid input for java.net.URI. So java.net.URI will do everything for us and then the path of it is what we want.

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

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

I've tried using <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/net/URI.html" rel="noreferrer">java.net.URI</a>, but it seems to decode the query string so in the above example I'm left with "alias=pos&amp;FirstName=Foo+A&amp;B=C&amp;LastName=Bar" so there is ambiguity whether a "&amp;" is a query separator or is a character in a query component.

Edit: I just tried <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/net/URI.html#getRawQuery%28%29" rel="noreferrer">URI.getRawQuery()</a> and it doesn't do the encoding, so I can split the query string with a <code>&amp;</code>, but then what do I do? Javascript has <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Functions/decodeURIComponent" rel="noreferrer">decodeURIComponent</a>, I can't seem to find the corresponding method in Java.

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

Decoding URI query string in Java

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要解码包含查询字符串的URI；预期的输入/输出行为如下所示：abstract class URIParser{           /** example input:       * something?alias=pos&FirstName=Foo+A%26B%3DC&LastName=Bar */    URIParser(String input) { ... }    /** sho

问用Java解码URI查询字符串
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回答 5

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