CODEWITHSUNDEEP
javaandroid
user1557330
user1557330

Reputation: 129

How to concatenate path to base url when a url redirects?

I'm making a request to:

http://www.baseaddress.com/path/index1.html

According to the arguments I sent, I'm getting a redirect to one of this two: http://www.baseaddress.com/path2/
OR http://www.baseaddress.com/path/index2.html

The problem is that the respond returns only: index2.html or /path2/

for now I check if the first char is /, and concatenate the URL according to this. Is there a simple method for doing this without string checking?

the code:

url = new URL("http://www.baseaddress.com/path/index1.php");
con = (HttpURLConnection) url.openConnection();
... some settings
in = con.getInputStream();
redLoc = con.getHeaderField("Location"); // returns "index2.html" or "/path2/"
if(redLoc.startsWith("/")){
  url = new URL("http://www.baseaddress.com" + redLoc);
}else{
  url = new URL("http://www.baseaddress.com/path/" + redLoc);
}

do you think this is the best method?

Upvotes: 5

Views: 22631

Answers (3)

alaeus
alaeus

Reputation: 171

You can use the Java class URI function resolve to merge these URIs.

public String mergePaths(String oldPath, String newPath) {
    try {
        URI oldUri = new URI(oldPath);
        URI resolved = oldUri.resolve(newPath);
        return resolved.toString();
    } catch (URISyntaxException e) {
        return oldPath;
    }
}

Example:

System.out.println(mergePaths("http://www.baseaddress.com/path/index.html", "/path2/"));
System.out.println(mergePaths("http://www.baseaddress.com/path/index.html", "index2.html"));

Will output:

http://www.baseaddress.com/path2/
http://www.baseaddress.com/path/index2.html

Upvotes: 1

MAC
MAC

Reputation: 15847

if(!url.contains("index2.html"))
{
   url = url+"index2.html";
}

Upvotes: 1

LiuYan 刘研
LiuYan 刘研

Reputation: 1624

You can use java.net.URI.resolve to determine the redirected absolute URL.

java.net.URI uri = new java.net.URI ("http://www.baseaddress.com/path/index1.html");
System.out.println (uri.resolve ("index2.html"));
System.out.println (uri.resolve ("/path2/"));

Output

http://www.baseaddress.com/path/index2.html
http://www.baseaddress.com/path2/

Upvotes: 22

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