Develop Reference

How to encode only a part of URL

I have incomplete URL's which I am redirecting (don't have the full URL) like
a.jsp?id=269101|14000
and
b.jsp?action=in&id=239394|2000&inmethod=
I wanted to encode the pipe "|" char only, so I started with java.net.URI class but it asks for complete url.So I used URLEncoder but it encodes the entire url.
I know I can look for | in url and encode it directly but what would be the best approach?

Using String.replace():
String myUrl = "b.jsp?action=in&id=239394|2000&inmethod=";
myUrl = myUrl.replace("|","%7C");

You need to use the URLEncoder on each query parameter value that needs to be encoded.
String url = "b.jsp?action=in" +
"&id=" + URLEncoder.encode("239394|2000", StandardCharsets.UTF_8) +
"&inmethod=";
System.out.println(url); // prints: b.jsp?action=in&id=239394%7C2000&inmethod=

Using the URLEncoder is the correct way to go. However you should do the encoding before you create your full url. using it on your full url will cause all special URL characters to be encoded. Which is not what you want here
Change your code to something like this
String url = "a.jsp?id=" + URLEncoder.encode("269101|14000",StandardCharsets.UTF_8);

How to escape = in #queryparam annotation in jax rs

I have a service that checks if the given url is present in the database. I'm using #QueryParam annotation but it is not returning the complete url for youtube, i.e., it is ignoring the video id.
Any help would be appreciated!

You have just to encode the query parameter before send it, for example to send:
https://www.youtube.com/watch?v=y6120QOlsfU
encode it like this:
url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3Dy6120QOlsfU
and then in your Controller just decode it:
String result = java.net.URLDecoder.decode(url, "UTF-8");

Use the java.net.URLEncoder and java.netURLDecoder to encode/decode URLs.
Maybe you should give a look on URLDecoder that would solve your problem.

Hindi characters in url parameter in java

I am working on language identifier where i need to pass the text to server and identify the language where I'm trying to pass the Hindi characters through URL to server.How can i pass the Hindi characters as URL parameter in java.please somebody help me with this.

You need to encode your URL using URLEncoder. Just use URLEncoder.encode method, something like this:
String yourEncodedURL = URLEncoder.encode(yourURLWithHindiCharacters, "UTF-8");

java request.getQueryString() value different between chrome and ie browser

I have a request,In Browser address bar enter:
http://localhost:8888/cmens-tops-outwear/t-b-f-a-c-s-fLoose-p-g-e-i-o.htm?'"--></style></script><script>netsparker(0x0000E1)</script>=
Tomcat6.0.35 i have set URIEncoding="UTF-8"
Use request.getQueryString() in servlet:
if chrome,i get
'%22--%3E%3C/style%3E%3C/script%3E%3Cscript%3Enetsparker(0x0000E1)%3C/script%3E=
if ie,I get
'"--></style></script><script>netsparker(0x0000E1)</script>=
Why?
Additional
I want to get request.getQueryString() to create a uri
URI uri = URI.create(url)
if ie:
java.net.URISyntaxException: Illegal character in query at index 36: /cmens/t-b-f-a-c-s-f-p-g-e-i-o.htm?'"--></style></script><script>netsparker(0x0000E1)</script>
at java.net.URI$Parser.fail(URI.java:2809)
at java.net.URI$Parser.checkChars(URI.java:2982)
at java.net.URI$Parser.parseHierarchical(URI.java:3072)
at java.net.URI$Parser.parse(URI.java:3024)
at java.net.URI.<init>(URI.java:578)
at java.net.URI.create(URI.java:840)
How to determine the queryString whether has be encoded?

The HttpServletRequest#getQueryString() is per definition undecoded. See also the javadoc (emphasis mine):
Returns:
a String containing the query string or null if the URL contains no query string. The value is not decoded by the container.
Basically, you need to URL-decode it yourself if you'd like to parse it manually instead of using getParameterXxx() methods for some reason (which implicitly decodes the parameters!).
String decodedQueryString = URLDecoder.decode(request.getQueryString(), "UTF-8");
As to why Chrome sends it encoded while IE not, that's because Chrome is doing a better job of handling HTTP requests the safe/proper way. This is beyond your control. Just always URL-decode the query string yourself if you intend to parse it manually for some reason. The URIEncoding="UTF-8" configuration has only effect on getParameterXxx() methods during GET requests.

The Chrome version is URLEncoded while the IE string is decoded.
Use this tool to compare the URLEncoded and decoded versions: http://meyerweb.com/eric/tools/dencoder/

Chrome uses the URL encoding way, but IE is using strings.
For example: " is %22 in URL encoding.
< is %3E
and > is %3C
Chrome is doing it the "right way" but IE just can't do as all the others.
You can find complete list of URL characters here: http://www.w3schools.com/tags/ref_urlencode.asp

Chrome sends the url encoded. Try decoding the query string using
URLDecoder.decode(queryString, "UTF-8");
As stated by the javadoc, the query string is not decoded by the container:
returns a String containing the query string or null if the URL contains no query string. The value is not decoded by the container.
javadoc

Escaping & in a URL

I am using jsps and in my url I have a value for a variable like say "L & T". Now when I try to retrieve the value for it by using request.getParameter I get only "L". It recognizes "&" as a separator and thus it is not getting considered as a whole string.
How do I solve this problem?

java.net.URLEncoder.encode("L & T", "utf8")
this outputs the URL-encoded, which is fine as a GET parameter:
L+%26+T

A literal ampersand in a URL should be encoded as: %26
// Your URL
http://www.example.com?a=l&t
// Encoded
http://www.example.com?a=l%26t

You need to "URL encode" the parameters to avoid this problem. The format of the URL query string is:
...?<name>=<value>&<name>=<value>&<etc>
All <name>s and <value>s need to be URL encoded, which basically means transforming all the characters that could be interpreted wrongly (like the &) into %-escaped values. See this page for more information:
http://www.w3schools.com/TAGS/ref_urlencode.asp
If you're generating the problem URL with Java, you use this method:
String str = URLEncoder.encode(input, "UTF-8");
Generating the URL elsewhere (some templates or JS or raw markup), you need to fix the problem at the source.

You can use UriUtils#encode(String source, String encoding) from Spring Web. This utility class also provides means for encoding only some parts of the URL, like UriUtils#encodePath.