@Test
public void test() {
	String s1 = "{\"fund_bill_list\":[{\"amount\":\"10.26\",\"fund_channel\":\"ALIPAYACCOUNT\"},{\"amount\":\"1.24\",\"fund_channel\":\"DISCOUNT\",\"real_amount\":\"0.00\"}],\"invoice_amount\":\"10.26\",\"total_amount\":\"11.50\",\"trade_no\":\"2017080421001004040273206391\",\"trade_status\":\"TRADE_SUCCESS\"}";
	JSONObject o = JSONObject.parseObject(s1);
	System.out.println(o.getString("fund_bill_list"));
}

同样一段代码，使用JDK7和JDK8分别运行的结果不一致
使用JDK7运行结果：
[{"amount":"10.26","fund_channel":"ALIPAYACCOUNT"},{"amount":"1.24","fund_channel":"DISCOUNT","real_amount":"0.00"}]

使用JDK8运行结果：
[{"amount":"10.26","fund_channel":"ALIPAYACCOUNT"},{"real_amount":"0.00","amount":"1.24","fund_channel":"DISCOUNT"}]

fastjson版本: 1.2.35