blocks|key|817646|text|编码查询参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817647|org.apache.commons.httpclient.util.URIUtil
++++URIUtil.encodeQuery(input);|code-block|syntax|javascript|817648|或者如果您想转义URI中的字符|817649|public+static+String+escapeURIPathParam(String+input)+{
++StringBuilder+resultStr+=+new+StringBuilder();
++for+(char+ch+:+input.toCharArray())+{
+++if+(isUnsafe(ch))+{
++++resultStr.append('%25');
++++resultStr.append(toHex(ch+/+16));
++++resultStr.append(toHex(ch+%25+16));
+++}+else{
++++resultStr.append(ch);
+++}
++}
++return+resultStr.toString();
+}

+private+static+char+toHex(int+ch)+{
++return+(char)+(ch+<+10+?+'0'+%2B+ch+:+'A'+%2B+ch+-+10);
+}

+private+static+boolean+isUnsafe(char+ch)+{
++if+(ch+>+128+%7C%7C+ch+<+0)
+++return+true;
++return+"+%25$&%2B,/:;=?@<>#%25".indexOf(ch)+>=+0;
+}|817650|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Encode Query params

<pre><code>org.apache.commons.httpclient.util.URIUtil
 URIUtil.encodeQuery(input);
</code></pre>

OR if you want to escape chars within URI

<pre><code>public static String escapeURIPathParam(String input) {
 StringBuilder resultStr = new StringBuilder();
 for (char ch : input.toCharArray()) {
 if (isUnsafe(ch)) {
 resultStr.append('%');
 resultStr.append(toHex(ch / 16));
 resultStr.append(toHex(ch % 16));
 } else{
 resultStr.append(ch);
 }
 }
 return resultStr.toString();
 }

 private static char toHex(int ch) {
 return (char) (ch &lt; 10 ? '0' + ch : 'A' + ch - 10);
 }

 private static boolean isUnsafe(char ch) {
 if (ch &gt; 128 || ch &lt; 0)
 return true;
 return " %$&amp;+,/:;=?@&lt;&gt;#%".indexOf(ch) &gt;= 0;
 }
</code></pre>

blocks|key|817652|text|查看java.net.URI类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817653|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check out the java.net.URI class.

blocks|key|817676|text|对URLEncoder使用字符集"ISO-8859-1“|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|817677|entityMap^0|H|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

use character-set "<code>ISO-8859-1</code>" for URLEncoder

blocks|key|817735|text|空格在URL中编码为%2520，在表单提交的数据中编码为%2B+(内容类型应用程序/x-www-form-urlencoded)。你需要前者。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|817736|使用Guava|817737|dependencies+{
+++++compile+'com.google.guava:guava:23.0'
+++++//+or,+for+Android:
+++++compile+'com.google.guava:guava:23.0-android'
}|code-block|syntax|javascript|817738|您可以使用UrlEscapers|817739|String+encodedString+=+UrlEscapers.urlFragmentEscaper().escape(inputString);|817740|不要使用String.replace，这只会对空格进行编码。请改用库。|817741|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/google/guava|1|https://google.github.io/guava/releases/23.0/api/docs/com/google/common/net/UrlEscapers.html^0|A|3|Q|1|0|2|5|0|0|0|5|B|1|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|O|3|P|5|J|7|1G|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1H|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]]]

A space is encoded to <code>%20</code> in URLs, and to <code>+</code> in forms submitted data (content type application/x-www-form-urlencoded). You need the former.

Using <a href="https://github.com/google/guava" rel="noreferrer">Guava</a>:

<pre><code>dependencies {
 compile 'com.google.guava:guava:23.0'
 // or, for Android:
 compile 'com.google.guava:guava:23.0-android'
}
</code></pre>

You can use <a href="https://google.github.io/guava/releases/23.0/api/docs/com/google/common/net/UrlEscapers.html" rel="noreferrer">UrlEscapers</a>:

<pre class="lang-java prettyprint-override"><code>String encodedString = UrlEscapers.urlFragmentEscaper().escape(inputString);
</code></pre>

Don't use String.replace, this would only encode the space. Use a library instead.

blocks|key|1032625|text|这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1032626|org.apache.catalina.util.URLEncoder+ul+=+new+org.apache.catalina.util.URLEncoder().encode("MY+URL");|code-block|syntax|javascript|1032627|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This worked for me

<pre><code>org.apache.catalina.util.URLEncoder ul = new org.apache.catalina.util.URLEncoder().encode("MY URL");
</code></pre>

blocks|key|1032668|text|在Android上也一直在为此而苦苦挣扎，我偶然发现了Uri.encode(String，String)，而特定于android的(android.net.Uri)可能会对一些人有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1032669|静态字符串编码(字符串%25+s，字符串允许)|1032670|https://developer.android.com/reference/android/net/Uri.html#encode(java.lang.String,+java.lang.String)|offset|length|1032671|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/net/Uri.html#encode(java.lang.String,%2520java.lang.String)^0|0|0|0|2V|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Just been struggling with this too on Android, managed to stumble upon Uri.encode(String, String) while specific to android (android.net.Uri) might be useful to some. 

static String encode(String s, String allow)

<a href="https://developer.android.com/reference/android/net/Uri.html#encode(java.lang.String,%20java.lang.String)" rel="noreferrer">https://developer.android.com/reference/android/net/Uri.html#encode(java.lang.String, java.lang.String)</a>

blocks|key|817858|text|虽然相当老了，但还是有一个快速的反应：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817859|Spring提供了UriUtils+--有了它，你可以指定如何编码，以及它与URI的哪个部分相关。|817860|encodePathSegment
encodePort
encodeFragment
encodeUriVariables
....|code-block|syntax|javascript|817861|我使用它们是因为我们已经在使用Spring了，也就是说不需要额外的库！|817862|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Although quite old, nevertheless a quick response: 

Spring provides UriUtils - with this you can specify how to encoded and which part is it related from an URI, e.g.

<pre><code>encodePathSegment
encodePort
encodeFragment
encodeUriVariables
....
</code></pre>

I use them cause we already using Spring, i.e. no additonal library is required!

blocks|key|817888|text|如果你正在使用jetty，那么org.eclipse.jetty.util.URIUtil将会解决这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|817889|String+encoded_string+=+URIUtil.encodePath(not_encoded_string).toString();|code-block|syntax|javascript|817890|entityMap^0|F|U|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you are using jetty then <code>org.eclipse.jetty.util.URIUtil</code> will solve the issue.
<pre><code>String encoded_string = URIUtil.encodePath(not_encoded_string).toString();
</code></pre>

blocks|key|817917|text|如果你想编码URI路径组件，你也可以使用standard+JDK函数，例如|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|817918|public+static+String+encodeURLPathComponent(String+path)+{
++++try+{
++++++++return+new+URI(null,+null,+path,+null).toASCIIString();
++++}+catch+(URISyntaxException+e)+{
++++++++//+do+some+error+handling
++++}
++++return+"";
}|code-block|syntax|javascript|817919|URI类还可用于编码URI的不同部分或整个URI。|817920|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/8/docs/api/java/net/URI.html#URI-java.lang.String-java.lang.String-java.lang.String-int-java.lang.String-java.lang.String-java.lang.String-^0|K|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

If you want to encode URI path components, you can also use <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html#URI-java.lang.String-java.lang.String-java.lang.String-int-java.lang.String-java.lang.String-java.lang.String-" rel="nofollow noreferrer">standard JDK</a> functions, e.g.
<pre><code>public static String encodeURLPathComponent(String path) {
 try {
 return new URI(null, null, path, null).toASCIIString();
 } catch (URISyntaxException e) {
 // do some error handling
 }
 return &quot;&quot;;
}
</code></pre>
The URI class can also be used to encode different parts of or whole URIs.

blocks|key|817961|text|它不是一行程序，但您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817962|URL+url+=+new+URL("https://some-host.net/dav/files/selling_Rosetta+Stone+Case+Study.png.aes");
URI+uri+=+new+URI(url.getProtocol(),+url.getUserInfo(),+url.getHost(),+url.getPort(),+url.getPath(),+url.getQuery(),+url.getRef());
System.out.println(uri.toString());|code-block|syntax|javascript|817963|这将为您提供一个输出：|817964|https://some-host.net/dav/files/selling_Rosetta%2520Stone%2520Case%2520Study.png.aes|817965|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

It's not one-liner, but you can use:
<pre><code>URL url = new URL(&quot;https://some-host.net/dav/files/selling_Rosetta Stone Case Study.png.aes&quot;);
URI uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(), url.getPort(), url.getPath(), url.getQuery(), url.getRef());
System.out.println(uri.toString());
</code></pre>
This will give you an output:
<pre><code>https://some-host.net/dav/files/selling_Rosetta%20Stone%20Case%20Study.png.aes
</code></pre>

blocks|key|817997|text|尝试以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817998|添加新的依赖项|817999|
<dependency>
++++<groupId>org.apache.tomcat</groupId>
++++<artifactId>tomcat-catalina</artifactId>
++++<version>10.0.13</version>
</dependency>|code-block|syntax|javascript|818000|现在，请执行以下操作：|818001|String+str+=+"Hello%2BWorld";+//+For+"Hello+World",+decoder+is+not+required
//+import+java.net.URLDecoder;
String+newURL+=+URLDecoder.decode(str,+StandardCharsets.UTF_8);
//+import+org.apache.catalina.util.URLEncoder;
System.out.println(URLEncoder.DEFAULT.encode(newURL,+StandardCharsets.UTF_8));|818002|您将获得如下输出：|818003|Hello%2520World|818004|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Try below approach:
Add a new dependency
<pre><code>&lt;!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-catalina --&gt;
&lt;dependency&gt;
 &lt;groupId&gt;org.apache.tomcat&lt;/groupId&gt;
 &lt;artifactId&gt;tomcat-catalina&lt;/artifactId&gt;
 &lt;version&gt;10.0.13&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
Now do as follows:
<pre><code>String str = &quot;Hello+World&quot;; // For &quot;Hello World&quot;, decoder is not required
// import java.net.URLDecoder;
String newURL = URLDecoder.decode(str, StandardCharsets.UTF_8);
// import org.apache.catalina.util.URLEncoder;
System.out.println(URLEncoder.DEFAULT.encode(newURL, StandardCharsets.UTF_8));
</code></pre>
You'll get the output as:
<pre><code>Hello%20World
</code></pre>

I am expecting

<pre><code>System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8"));
</code></pre>

to output:

<code>Hello%20World</code>

(20 is ASCII Hex code for space)

However, what I get is:

<code>Hello+World</code>

Am I using the wrong method? What is the correct method I should be using?

URLEncoder not able to translate space character

Android

我期待着System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8"));要输出，请执行以下操作：Hello%20World(20是表示空格的ASCII十六进制代码)然而，我得到的是：Hello+World我是不是用错了方法？我应该使用的正确方...

问URLEncoder无法转换空格字符
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