URLEncoder使用字符集“ISO-8859-1”

一个空格在url中被编码为%20，在表单提交的数据中被编码为+(内容类型为application/x-www-form-urlencoded)。你需要前者。

使用番石榴:

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

你可以使用UrlEscapers:

String encodedString = UrlEscapers.urlFragmentEscaper().escape(inputString);

不要使用String。替换，这只会编码空间。使用库代替。

只是在Android上也在挣扎，设法偶然发现了Uri。encode(字符串，字符串)而特定于android (android.net.Uri)可能对一些有用。

静态字符串编码(字符串s，字符串允许)

以https://developer.android.com/reference/android/net/Uri.html编码(以)

查看uri类。

该类执行application/x-www-form- urlenencoded -type编码，而不是百分比编码，因此替换为+是正确的行为。

从javadoc:

When encoding a String, the following rules apply: The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same. The special characters ".", "-", "*", and "_" remain the same. The space character " " is converted into a plus sign "+". All other characters are unsafe and are first converted into one or more bytes using some encoding scheme. Then each byte is represented by the 3-character string "%xy", where xy is the two-digit hexadecimal representation of the byte. The recommended encoding scheme to use is UTF-8. However, for compatibility reasons, if an encoding is not specified, then the default encoding of the platform is used.

试试下面的方法:

添加一个新的依赖项

<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-catalina -->
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>10.0.13</version>
</dependency>

现在按照下面的步骤做:

String str = "Hello+World"; // 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));

你会得到如下的输出:

Hello%20World