import java.net.URLDecoder;import java.net.URLEncoder;
String strTest = "?=abc?中%1&2<3,4>";strTest = URLEncoder.encode(strTest, "UTF-8");System.out.println(strTest);strTest = URLDecoder.decode(strTest,"UTF-8");System.out.println(strTest);

%3F%3Dabc%3F%E4%B8%AD%251%262%3C3%2C4%3E?=abc?中%1&2<3,4>

String java.net.URLEncoder.encode(String s, String enc) throws UnsupportedEncodingExceptionTranslates a string into application/x-www-form-urlencoded format using a specific encoding scheme. This method uses the supplied encoding scheme to obtain the bytes for unsafe characters.Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilites.Parameters:    s String to be translated.     enc The name of a supported character encoding. Returns:    the translated String. Throws:    UnsupportedEncodingException - If the named encoding is not supported Since:    1.4 See Also:    URLDecoder.decode(java.lang.String, java.lang.String) String java.net.URLDecoder.decode(String s, String enc) throws UnsupportedEncodingExceptionDecodes a application/x-www-form-urlencoded string using a specific encoding scheme. The supplied encoding is used to determine what characters are represented by any consecutive sequences of the form "%xy".Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilites.Parameters:    s the String to decode     enc The name of a supported character encoding. Returns:    the newly decoded String Throws:    UnsupportedEncodingException - If character encoding needs to be consulted, but named character encoding is not supported Since:    1.4 See Also:    URLEncoder.encode(java.lang.String, java.lang.String)