Java Utililty Methods URL Decode

List of utility methods to do URL Decode

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Description

The list of methods to do URL Decode are organized into topic(s).

Method

Stringdecode(String value, String charset)
decode 
String decoded = null;
try {
    decoded = URLDecoder.decode(value, charset);
} catch (UnsupportedEncodingException e) {
    decoded = null;
return decoded;
Stringdecode(String value, String charset)
decode 
String result = null;
if (!isEmpty(value)) {
    try {
        result = URLDecoder.decode(value, charset);
    } catch (IOException e) {
        throw new RuntimeException(e);
return result;
Stringdecode(String value, String encoding)
UnsupportedEncodingException -> value returns. 
String decode = null;
try {
    decode = URLDecoder.decode(value, encoding);
} catch (UnsupportedEncodingException e) {
    decode = value;
return decode;
StringdecodeAjax(String value)
decode Ajax 
String result = null;
try {
    result = decode(value, UTF8);
} catch (UnsupportedEncodingException e) {
    result = "";
    e.printStackTrace();
return result;
...
StringdecodeAjaxParam(final String source)
decode Ajax Param 
String target = source;
try {
    target = (source == null ? source : URLDecoder.decode(source, ISO_8859_1));
} catch (final UnsupportedEncodingException ex) {
return target;
String[]decodeArray(final String val)
Return a StringArray resulting from decoding the given String which should have been encoded by encodeArray 
if (val == null) {
    return null;
int len = val.length();
if (len == 0) {
    return new String[0];
ArrayList<String> al = new ArrayList<String>();
...
StringdecodeCodedStr(String sourceStr, String targetCharset)
decode Coded Str 
String decodedStr;
String changedStr = changeCharset(sourceStr, targetCharset);
if (changedStr != null) {
    try {
        decodedStr = URLDecoder.decode(URLDecoder.decode(changedStr, targetCharset), targetCharset);
    } catch (Exception e) {
        decodedStr = "unknown";
    return decodedStr;
return null;
MapdecodeFormData(String formData)
decode Form Data 
Map<String, String> decodedFormData = new HashMap<String, String>();
String[] pairs = formData.split("\\&");
for (int i = 0; i < pairs.length; i++) {
    String[] fields = pairs[i].split("=");
    String name = URLDecoder.decode(fields[0], "UTF-8");
    String value = URLDecoder.decode(fields[1], "UTF-8");
    decodedFormData.put(name, value);
return decodedFormData;
StringdecodeHtmlString(String inputString)
decode Html String 
String result;
try {
    result = java.net.URLDecoder.decode(inputString, "UTF8");
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
    result = "";
return result;
...
StringdecodeIfNeeded(String s)
Unfortunately we have code that mindlessly decoded URLs (FileDownloadWindow) which borked (in the case I discovered) magnet uris with encoded parameters (e.g. 
if (s == null) {
    return ("");
try {
    int q_pos = s.indexOf('?');
    int a_pos = s.indexOf('&');
    if (q_pos == -1 && a_pos == -1) {
        return (decode(s));
...