Java 验证 URI 是有效的 http URI
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validate that URI is valid http URI
提问by Alfred
Solution
解决方案
Okay I found 1 solution on Stackoverflow after a little more searching but I hope to do it with no extra libraries. How to check for a valid URL in Java?
好的，经过多一点搜索，我在 Stackoverflow 上找到了 1 个解决方案，但我希望在没有额外库的情况下做到这一点。如何在 Java 中检查有效的 URL？
My problem:
我的问题：
First of hopefully this is not a duplicate, but I could not find the right answer(right away). I would like to validate that an URI(http) is valid in Java. I came up with the following tests but I can't get them to pass. First I used getPort(), but then http://www.google.nlwill return -1 on getPort(). This are the test I want to have passed
首先希望这不是重复的，但我找不到正确的答案（马上）。我想验证 URI(http) 在 Java 中是否有效。我想出了以下测试，但我无法让它们通过。首先我使用getPort()，但随后http://www.google.nl将返回-1 getPort()。这是我想通过的测试
Test:
测试：
@Test
public void testURI_Isvalid() throws Exception {
assertFalse(HttpUtils.validateHTTP_URI("ttp://localhost:8080"));
assertFalse(HttpUtils.validateHTTP_URI("ftp://localhost:8080"));
assertFalse(HttpUtils.validateHTTP_URI("http://localhost:8a80"));
assertTrue(HttpUtils.validateHTTP_URI("http://localhost:8080"));
final String justWrong =
"/schedule/get?uri=http://localhost:8080&time=1000000";
assertFalse(HttpUtils.validateHTTP_URI(justWrong));
assertTrue(HttpUtils.validateHTTP_URI("http://www.google.nl"));
}
This is what I came up with after I removed the getPort()part but this does not pass all my unit tests.
这是我移除getPort()零件后想到的，但这并没有通过我的所有单元测试。
Production code:
生产代码：
public static boolean validateHTTP_URI(String uri) {
final URI u;
try {
u = URI.create(uri);
} catch (Exception e1) {
return false;
}
return "http".equals(u.getScheme());
}
This is the first test that is failing because I am no longer validating the getPort() part. Hopefully somebody can help me out. I think I am not using the right class to validate URLs?
这是第一个失败的测试，因为我不再验证 getPort() 部分。希望有人可以帮助我。我想我没有使用正确的类来验证 URL？
P.S:
PS：
I don't want to connect to the server to validate the URI is correct. At least not yet in this step. I only want to validate scheme.
我不想连接到服务器来验证 URI 是否正确。至少在这一步还没有。我只想验证方案。
采纳答案by Alfred
Code that will PASS
将通过的代码
public static boolean validateHTTP_URI(String uri) {
final URL url;
try {
url = new URL(uri);
} catch (Exception e1) {
return false;
}
return "http".equals(url.getProtocol());
}
My next Question is:
我的下一个问题是：
I heard/read(Joshua Bloch I believe) somewhere that Url does not work properly if you don't have internet(anymore). But I don't think that's true(anymore)? Could someone please elaborate.
我听说/读过（我相信是 Joshua Bloch）如果你没有互联网（不再），Url 就不能正常工作。但我不认为那是真的（不再）？有人可以请详细说明。
回答by Tom
You could try to use this regular expression:
您可以尝试使用此正则表达式：
(?:(?<protocol>http(?:s?)|ftp)(?:\:\/\/)) (?:(?<usrpwd>\w+\:\w+)(?:\@))? (?<domain>[^/\r\n\:]+)? (?<port>\:\d+)? (?<path>(?:\/.*)*\/)? (?<filename>.*?\.(?<ext>\w{2,4}))? (?<qrystr>\??(?:\w+\=[^\#]+)(?:\&?\w+\=\w+)*)* (?<bkmrk>\#.*)?
This will tell you if an URL is valid and it will give you the protocolvalue. I don't know Java, so I don't know what class you need to use to validate Regular Expressions.
这将告诉您 URL 是否有效，并为您提供protocol值。我不懂 Java，所以我不知道您需要使用什么类来验证正则表达式。
