37 lines
1.1 KiB
Markdown
37 lines
1.1 KiB
Markdown
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：
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```java
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public class JSONPath {
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public static JSONPath of(String[] paths, Type[] types) {
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return of(paths, types, null, null);
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}
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public static JSONPath of(
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String[] paths,
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Type[] types,
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String[] formats,
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ZoneId zoneId,
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JSONReader.Feature... features
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);
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}
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```
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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。
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```java
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JSONObject object = JSONObject.of("id", 1001, "name", "DataWorks", "date", "2017-07-14");
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JSONPath jsonPath = JSONPath.of(
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new String[]{"$.id", "$.name", "$.date"},
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new Type[]{Long.class, String.class, Date.class}
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);
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Object[] expected = new Object[]{1001L, "DataWorks", DateUtils.parseDate("2017-07-14")};
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Object[] evalResult = (Object[]) jsonPath.eval(object);
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assertArrayEquals(expected, evalResult);
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String jsonStr = object.toString();
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Object[] result = (Object[]) jsonPath.extract(jsonStr);
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assertArrayEquals(expected, result);
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```
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