title: How do I make JSONObject toString escape unicode characters?
body: <p>Similar to <a href="https://stackoverflow.com/questions/23565486/how-do-i-make-the-tostring-of-the-jsonobject-encode-the-utf-8-characters-to-un">this</a>, I need the string equivalent of a net.sf.json.JSON object expressed entirely in ASCII characters.</p>
  
  <pre><code>new JSONObject().put("JSON", "帮").toString();
  </code></pre>
  
  <p>to return</p>
  
  <pre><code>{"JSON":"\u5E2E"}
  </code></pre>
  
  <p><em>not</em></p>
  
  <pre><code>{"JSON":"帮"}
  </code></pre>