java字符串返回成json
java端组装一个字符，返回json，json的数据不能用单引号，否则不无法返回成jsonString children = "[{\"data\":\"child1\",\"attr\":\"11\"},{\"data\":\"child2\",\"attr\":\"12\"}]";
输出json
public void writeAjax(String data,HttpServletResponse response) {PrintWriter out = null;try {out = response.getWriter();out.print(data);out.flush();} catch (IOException e) {e.printStackTrace();} finally {out.close();}}
最好不要自己组装json，使用JsonArray,JsonObject
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