java - 判断ByteArrayOutputStream的类型是JSONArray还是JSONObject？

Question

ByteArrayOutputStream result = new ByteArrayOutputStream();
while ((length = inputStream.read(buffer)) != -1) {
        result.write(buffer, 0, length);
}

有没有办法确定结果是否包含 JSONObject 还是 JSONArray？我一直盲目地将它转换为 JSONObject，但是，我遇到了它是 JSONArray 的情况 - 任何帮助将不胜感激。

JSON API:使用更快的 jackson 和 org.json

提前致谢

Answer 1

JSR 353 引用实现

参见https://jsonp.java.net/

这些是 Maven 依赖项:

<dependency>
    <groupId>javax.json</groupId>
    <artifactId>javax.json-api</artifactId>
    <version>1.0</version>
</dependency>

<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.json</artifactId>
    <version>1.0.4</version>
    <scope>runtime</scope>
</dependency>

代码示例:

// the JSON classes have package javax.json

ByteArrayOutputStream baos = new ByteArrayOutputStream();

// read JSON into baos

ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
InputStreamReader isr = new InputStreamReader(bais, Charset.forName("UTF-8"));
JsonReader jr = Json.createReader(isr);

JsonStructure js = jr.read();

switch (js.getValueType()) {
    case ARRAY:
        break;
    case OBJECT:
        break;
    case STRING:
        break;
    case NUMBER:
        break;
    case TRUE:
        break;
    case FALSE:
        break;
    case NULL:
        break;
}

FasterXML jackson

(只是一个有效的示例，很可能不是“最好的”)

Maven 依赖:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.3</version>
</dependency>

代码示例:

// see JsonNodeType
new ObjectMapper().reader().readTree("[]").getNodeType();