compile 'com.alibaba:fastjson:1.2.31'
compile 'com.alibaba:fastjson:1.1.57.android'

有如下json字符串和类：

String t2 = "{\"state\":2,\"msg\":\"msg2222\",\"data\":{}}";
    public static class Test {
        public int state;
        public String msg;
        public List<Data> data;
        public static class Data {
            public int d1;
            public String d2;
        }
    }

测试代码如下：

try {
            Test c2 = JSON.parseObject(t2, Test.class);
            Log.d("JSON", "c2 ----");
            com.alibaba.fastjson.JSONObject jsonObject = JSON.parseObject(t2);
            Test model = jsonObject.toJavaObject(Test.class);
            Log.d("JSON", "model ----");
        } catch ( Exception e) {
            e.printStackTrace();
        }

c2可以格式化出结果，但结果是错误的，
c2 = {MainActivity$Test@830029442312}

data = {ArrayList@830029442520} size = 1

0 = {MainActivity$Test$Data@830029442600}
d2 = null
d1 = 0
msg = "msg2222"
state = 2
model执行出现异常
e = {JSONException@830029375048} "com.alibaba.fastjson.JSONException: can not cast to : java.util.List<com.yyw.fastjson_example.MainActivity$Test$Data>"
cause = {JSONException@830029373272} "com.alibaba.fastjson.JSONException: can not cast to : java.util.List<com.yyw.fastjson_example.MainActivity$Test$Data>"
detailMessage = "can not cast to : java.util.List<com.yyw.fastjson_example.MainActivity$Test$Data>"
stackState = {int[38]@830029375080}
stackTrace = {StackTraceElement[0]@830024963328}
suppressedExceptions = {Collections$EmptyList@830024961208} size = 0