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javaandroid
Michaël
Michaël

Reputation: 3671

URLEncoder encode / URLDecoder decode in java (Android)

I want to use the URLEncoder/URLDecoder class (java.net.URLEncoder/URLDecoder) in an application and the methods : encode(String s, String enc)/decode(String s, String enc), but I don't know what can be the value of the String argument enc? I want to encode/decode in the "x-www-form-urlencoded" MIME content type. Thank you for your help.

Upvotes: 16

Views: 57127

Answers (5)

Matthias Ronge
Matthias Ronge

Reputation: 10112

My personal favourite:

static String baseNameFromURL(URL url) {
    String shortName;
    String path = url.getPath();
    String escaped = path.substring(path.lastIndexOf('/') + 1);
    try {
        shortName = URLDecoder.decode(escaped, "UTF-8");
    } catch (UnsupportedEncodingException e) {
        throw new Error(e.getMessage(), e);
    }
    int period = shortName.lastIndexOf('.');
    return period > -1 ? shortName.substring(0, period) : shortName;
}

Returns an empty String if the URL doesn’t have a file name part, like https://stackoverflow.com/ or https://stackoverflow.com/questions/. If there is a backslash in the file name part, it is conserved.

You may strip off the last two lines if you need the short name with extension instead.

Upvotes: 0

Stan
Stan

Reputation: 6561

URLEncoder and URLDecoder both are exception Throwable and thus must be at least enclosed by try/catch block. However there is a litle bit simplier way using android.net.Uri:

Uri.decode(string);
Uri.encode(string);

Those are static methods, uses utf-8, available since API-1 and throws no exception.

Upvotes: 0

jgre
jgre

Reputation: 787

The encoding parameter is the character encoding you're using. For example "UTF-8".

Upvotes: 18

Sourabh
Sourabh

Reputation: 1615

First you need to set the content-type as a 'x-www-form-urlencoded'. Then whatever content you would like to encode, encode it using "UTF-8".

For example:

For setting content to 'x-www-form-urlencoded':

URL url = new URL("http://www.xyz.com/SomeContext/SomeAction"); <br>
URLConnection urlConnection = url.openConnection();<br>
....<br>
....<br>
urlConnection.setRequestProperty("Content-type","application/x-www-form-urlencoded");


Or if you are using some JSP then you can write the following on top of it.

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %><br>
< META http-equiv="Content-Type" content="text/html; charset=UTF-8">


< FORM action="someaction.jsp" enctype="application/x-www-form-urlencoded" name="InputForm" method="POST">

And to use URLEncoder:

String encodedString = URLEncoder.encode("hello","UTF-8");

Upvotes: 4

Thilo-Alexander Ginkel
Thilo-Alexander Ginkel

Reputation: 6958

The JavaDoc has all the details

Upvotes: 1

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