Alibaba Fastjson

json string 转 Object

• json string -> JavaBean

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  Person person = JSON.parseObject(json, Person.class); // 或者 Person person = JSON.parseObject(json, new TypeReference<Person>() {});

• json -> Map

  1	Map<String, Person> map = JSON.parseObject(json, new TypeReference<Map<String, Person>>() {});

• json -> List

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  List<Person> persons = JSON.parseArray(json, Person.class); // 或者 List<Person> persons = JSON.parseObject(json, new TypeReference<List<Person>>() {}); // 或者(嵌套) List<Map<String, Person>> persons = JSON.parseObject(json, new TypeReference<List<Map<String, Person>>>() {});

对于TypeReference，由于其构造方法使用 protected 进行修饰，所以在其他包下创建其对象的时候，
要用其实现类的子类：new TypeReference() {} ```java // com.alibaba.fastjson.TypeReference.java 源码 public class TypeReference { private final Type type; public static final Type LIST_STRING = (new TypeReference<List>() { }).getType();

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protected TypeReference() {
    Type superClass = this.getClass().getGenericSuperclass();
    this.type = ((ParameterizedType)superClass).getActualTypeArguments()[0];
}

public Type getType() {
    return this.type;
} } ```

Object 转 json string

• JavaBean -> json string

  1	String result = JSON.toJSONString(object);

json Object to JavaObject

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Person person = JSON.toJavaObject(jsonObject, Person.class);