Java escape JSON String

Question

I have the following JSON string that i am sending to a NodeJS server   String string       id         userID         type         methoden         msg         msget          name         namnet          channel         activeChatChannel          visitorNick           agentID          agentID           PrintWriter pw   new PrintWriter new OutputStreamWriter os   utf-8     pw println string     The problem becomes when the string msget contains the character   and    On the NodeJS server i am parsing the JSON like this   var obj   JSON parse message     Any ideas how i can manage to send all characters without problems

User · Answer

The best method would be using some JSON library, e.g. Jackson ( http://jackson.codehaus.org ).

But if this is not an option simply escape msget before adding it to your string:

The wrong way to do this is

String msgetEscaped = msget.replaceAll("\"", "\\\"");

Either use (as recommended in the comments)

String msgetEscaped = msget.replace("\"", "\\\"");

or

String msgetEscaped = msget.replaceAll("\"", "\\\\\"");

A sample with all three variants can be found here: http://ideone.com/Nt1XzO

User · Answer

org json simple JSONObject escape   escapes quotes       r   n   b   f   t and other control characters   import org json simple JSONValue  JSONValue escape  test string       json-simple home document   Add pom xml when using maven   lt dependency gt       lt groupId gt com googlecode json-simple lt  groupId gt       lt artifactId gt json-simple lt  artifactId gt       lt scope gt test lt  scope gt   lt  dependency gt

User · Answer

Consider Moshi s JsonWriter class  source   It has a wonderful API and it reduces copying to a minimum  everything is nicely streamed to the OutputStream  OutputStream os        JsonWriter json   new JsonWriter Okio sink os    json    beginObject      name  quot id quot   value userID     name  quot type quot   value methodn           endObject

User · Answer

According to the answer here  quotes in values need to be escaped  You can do that with     So just repalce the quote in your values  msget   msget replace

User · Answer

The JSON specification at https   www json org  is very simple by design  Escaping characters in JSON strings is not hard   This code works for me   private String escape String raw        String escaped   raw      escaped   escaped replace                    escaped   escaped replace                    escaped   escaped replace   b      b        escaped   escaped replace   f      f        escaped   escaped replace   n      n        escaped   escaped replace   r      r        escaped   escaped replace   t      t           TODO  escape other non-printing characters using uXXXX notation     return escaped

User · Answer

I would use a library to create your JSON String for you  Some options are    GSON Crockford s lib   This will make dealing with escaping much easier  An example  using org json  would be   JSONObject obj   new JSONObject     obj put  id   userID   obj put  type   methoden   obj put  msg   msget       etc   final String json   obj toString        lt -- JSON string

User · Answer

public static String ecapse String jsString        jsString   jsString replace                    jsString   jsString replace                    jsString   jsString replace   b      b        jsString   jsString replace   f      f        jsString   jsString replace   n      n        jsString   jsString replace   r      r        jsString   jsString replace   t      t        jsString   jsString replace                  return jsString

User · Answer

Try to replace all the   and   with a   before them  Do this just for the msget object String  I guess   Don t forget that   must be escaped too

User · Answer

If you want to simply escape a string  not an object or array  use this   String escaped   JSONObject valueToString   Quotes                 http   www json org javadoc org json JSONObject html valueToString java lang Object

User · Answer

Apache Commons  If you re already using Apache commons  it provides a static method for this   StringEscapeUtils escapeJson  some string     It converts any string into one that s properly escaped for inclusion in JSON  See the documentation here

[java] Java escape JSON String?

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