查看uri类。

这对我很有效

org.apache.catalina.util.URLEncoder ul = new org.apache.catalina.util.URLEncoder().encode("MY URL");

其他答案要么提供手动字符串替换，实际上编码HTML格式的URLEncoder, Apache放弃的URIUtil，或者使用Guava的UrlEscapers。最后一个很好，除了它没有提供解码器。

Apache Commons Lang提供了URLCodec，它根据URL格式rfc3986进行编码和解码。

String encoded = new URLCodec().encode(str);
String decoded = new URLCodec().decode(str);

如果您已经在使用Spring，您也可以选择使用它的UriUtils类。

URLEncoder使用字符集“ISO-8859-1”

我已经在使用Feign了，所以我可以使用UriUtils，但Spring UrlUtils不行。

<!-- https://mvnrepository.com/artifact/io.github.openfeign/feign-core -->
<dependency>
    <groupId>io.github.openfeign</groupId>
    <artifactId>feign-core</artifactId>
    <version>11.8</version>
</dependency>

我的模拟测试代码:

import feign.template.UriUtils;

System.out.println(UriUtils.encode("Hello World"));

输出:

你好%20世界

正如该类所暗示的，它编码uri而不是url，但OP要求的是uri而不是url。

System.out.println(UriUtils.encode("https://some-host.net/dav/files/selling_Rosetta Stone Case Study.png.aes"));

输出:

2F https 3A % % 2Fsome-host。网2Fdav % 2Ffiles 2Fselling_Rosetta % 20Stone 20Case % 20Study png。aes

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.