Java URL编码：URLEncoder与URI [英] Java URL encoding: URLEncoder vs. URI

问题描述

查看 W3学校网址编码网页，它说 @ 应编码为％40 ，而空格应编码为％20 。

Looking on the W3 Schools URL encoding webpage, it says that @ should be encoded as %40, and that space should be encoded as %20.

我已尝试过两次 URLEncoder 和 URI ，但上述情况都不正确：

I've tried both URLEncoder and URI, but neither does the above properly:

import java.net.URI;
import java.net.URLEncoder;

public class Test {
    public static void main(String[] args) throws Exception {

        // Prints me%40home.com (CORRECT)
        System.out.println(URLEncoder.encode("[e-mail]", "UTF-8"));

        // Prints Email+Address (WRONG: Should be Email%20Address)
        System.out.println(URLEncoder.encode("Email Address", "UTF-8"));

        // http://www.home.com/test?Email%20Address=[e-mail]
        // (WRONG: it has not encoded the @ in the email address)
        URI uri = new URI("http", "www.home.com", "/test", "Email Address=[e-mail]", null);
        System.out.println(uri.toString());
    }
}

出于某种原因， URLEncoder 电子邮件地址是否正确，但不是空格，而 URI 确实是空格而不是电子邮件地址。

For some reason, URLEncoder does the email address correctly but not spaces, and URI does spaces currency but not email addresses.

我应该如何对这2个参数进行编码以与w3schools所说的正确（或w3schools错误？）一致？

How should I encode these 2 parameters to be consistent with what w3schools says is correct (or is w3schools wrong?)

推荐答案

<虽然我认为@fge的答案是正确的，因为我使用的是依赖于W3Schools文章中概述的编码的第三方Web服务，但我遵循了 Java相当于生成相同输出的JavaScript的encodeURIComponent？

public static String encodeURIComponent(String s) {
    String result;

    try {
        result = URLEncoder.encode(s, "UTF-8")
                .replaceAll("\\+", "%20")
                .replaceAll("\\%21", "!")
                .replaceAll("\\%27", "'")
                .replaceAll("\\%28", "(")
                .replaceAll("\\%29", ")")
                .replaceAll("\\%7E", "~");
    } catch (UnsupportedEncodingException e) {
        result = s;
    }

    return result;
}

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