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jsonpath_multi_cn
温绍锦 edited this page Nov 28, 2022
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1 revision
对同一个JSON做多个JSONPath求值的场景,FASTJSON2提供了专门的API,能提升性能,如下:
public class JSONPath {
public static JSONPath of(String[] paths, Type[] types) {
return of(paths, types, null, null);
}
public static JSONPath of(
String[] paths,
Type[] types,
String[] formats,
ZoneId zoneId,
JSONReader.Feature... features
);
}
这样构造的JSONPath,在eval或者extract方法执行时,会返回和types类型匹配的对象数组。
JSONObject object = JSONObject.of("id", 1001, "name", "DataWorks", "date", "2017-07-14");
JSONPath jsonPath = JSONPath.of(
new String[]{"$.id", "$.name", "$.date"},
new Type[]{Long.class, String.class, Date.class}
);
Object[] expected = new Object[]{1001L, "DataWorks", DateUtils.parseDate("2017-07-14")};
Object[] evalResult = (Object[]) jsonPath.eval(object);
assertArrayEquals(expected, evalResult);
String jsonStr = object.toString();
Object[] result = (Object[]) jsonPath.extract(jsonStr);
assertArrayEquals(expected, result);