{
"id": 912345678901,
"age": 33,
"text": "How do I stream JSON in Java?",
"geo": null,
}红色部分如果表示有可能为null，则在判断的时候需要如下name.equals("geo")&& reader.peek() != JsonToken.NULL
橙色部分要是想不解析其中的Json字段，需要在判断的时候加上一个else语句如下：else{reader.skipValue()}
然后是一些例子，都是Json的各种组合形式，不定时更新
1. 现实Json数据，后面每一个都是如此不再做任何的解析了，然后跟着就是对应的代码内容
{
"id": 912345678901,
"text": "How do I stream JSON in Java?",
"geo": null,
"user": {
"name": "json_newb",
"followers_count": 41
}
}
reader.beginObject(); while (reader.hasNext()) { String name = reader.nextName(); if (name.equals("id")) { System.out.println("id:" + reader.nextLong()); } else if (name.equals("text")) { System.out.println("text:" + reader.nextString()); } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) { System.out.println("text:" + reader.nextString()); } else if (name.equals("user")) { usernameObject(); } else { reader.skipValue(); } } reader.endObject(); private void usernameObject() throws IOException{ reader.beginObject(); while (reader.hasNext()) { String nxtName = reader.nextName(); if (nxtName.equals("name")) { System.out.println("nxtName:" + reader.nextString()); } else if (nxtName.equals("followers_count")) { System.out.println("nxtName:" + reader.nextInt()); }
}
2.
[
{
"id": 912345678901,
"text": "How do I stream JSON in Java?",
"geo": null,
"user": {
"name": "json_newb",
"followers_count": 41
}
},
{
"id": 777777777888,
"text": "dfngsdnglnsldfnsl",
"geo": null,
"user": {
"name": "dsfgpd",
"followers_count": 24
}
}
]
reader.beginArray(); while(reader.hasNext()){ reader.beginObject(); while (reader.hasNext()) { String name = reader.nextName(); if (name.equals("id")) { System.out.println("id:" + reader.nextLong()); } else if (name.equals("text")) { System.out.println("text:" + reader.nextString()); } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) { System.out.println("text:" + reader.nextString()); } else if (name.equals("user")) { usernameObject(); } else { reader.skipValue(); } } reader.endObject(); }
reader.endArray();
3.
{
"statuses":[
{
"id": 912345678901,
"text": "How do I stream JSON in Java?",
"geo": null,
"user": {
"name": "json_newb",
"followers_count": 41
}
},
{
"id": 777777777888,
"text": "dfngsdnglnsldfnsl",
"geo": null,
"user": {
"name": "dsfgpd",
"followers_count": 24
}
}
]
}
reader.beginObject(); while(reader.hasNext()) { String begin = reader.nextName(); if(begin.equals("statuses")) { array(); } } reader.endObject(); private void array() throws IOException{ reader.beginArray(); while(reader.hasNext()){ reader.beginObject(); while (reader.hasNext()) { String name = reader.nextName(); if (name.equals("id")) { System.out.println("id:" + reader.nextLong()); } else if (name.equals("text")) { System.out.println("text:" + reader.nextString()); } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) { System.out.println("text:" + reader.nextString()); } else if (name.equals("user")) { usernameObject(); } else { reader.skipValue(); } } reader.endObject(); } reader.endArray(); } private void usernameObject() throws IOException{ reader.beginObject(); while (reader.hasNext()) { String nxtName = reader.nextName(); if (nxtName.equals("name")) { System.out.println("nxtName:" + reader.nextString()); } else if (nxtName.equals("followers_count")) { System.out.println("nxtName:" + reader.nextInt()); } } reader.endObject();
}