[QUESTION] JSON转util.Map

[hujian0923]

2.x中如何将JSON转util.Map

在1.x中JSON转util.Map如下：

//JSON格式: {"a":"111","b":"222","c":"333"}
JSONObject jsonConf = ...;
Map<String, String> conf = jsonConf.toJavaObject(new TypeReference<Map<String, String>>() {});

请问在2.x中应该怎么转换，没看到相应的兼容方法

[wenshao]

        String str = "{}";
        {
            JSONReader jsonReader = JSONReader.of(str);
            jsonReader.getContext().setObjectSupplier(HashMap::new);
            assertEquals(HashMap.class, jsonReader.readObject().getClass());
        }
        {
            JSONReader jsonReader = JSONReader.of(str);
            jsonReader.getContext().setObjectSupplier(HashMap::new);
            assertEquals(HashMap.class, jsonReader.read(Object.class).getClass());
        }
        {
            JSONReader jsonReader = JSONReader.of(str);
            jsonReader.getContext().setObjectSupplier(HashMap::new);
            assertEquals(HashMap.class, jsonReader.read(Map.class).getClass());
        }

2.0.5的如上例子中，可以配置ObjectSupplier，你可以自己决定用哪个Map

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson2/fastjson2/2.0.6-SNAPSHOT/
或者你可以试用2.0.6-SNAPSHOT，在2.0.6中有更方便的写法，比如：

assertEquals(HashMap.class, JSON.parse("{}", JSONReader.Feature.UseNativeObject).getClass());
assertEquals(HashMap.class, JSON.parseObject("{}", Object.class, JSONReader.Feature.UseNativeObject).getClass());

@Test
public void test3() {
    assertEquals(
            HashMap.class,
            JSON.parse(
                    "{}",
                    JSONFactory.createReadContext(HashMap::new)
            ).getClass()
    );

    assertEquals(
            HashMap.class,
            JSON.parseObject(
                    "{}",
                    Object.class,
                    JSONFactory.createReadContext(HashMap::new)
            ).getClass()
    );

    assertEquals(
            HashMap.class,
            JSON.parseObject(
                    "{}".getBytes(StandardCharsets.UTF_8),
                    Object.class,
                    JSONFactory.createReadContext(HashMap::new)
            ).getClass()
    );

    {
        Object parse = JSON.parse(
                "[{}]",
                JSONFactory.createReadContext(TreeMap::new, LinkedList::new)
        );
        assertEquals(LinkedList.class, parse.getClass());
        assertEquals(TreeMap.class, ((List) parse).get(0).getClass());
    }
}

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.6
问题已经修复，请用新版本