java - 哪个xml序列化库是性能导向的？

Question

<分区>

Answer 1

我严重怀疑 XStream 是否需要 200 毫秒，除非您发送一个非常大的对象。您确定您的 VM 已预热吗？

我不会将 StringBuffer 用作它的线程安全，并在每次调用时都锁定。请改用 StringBuilder。

下面的测试打印

Took 56 us on average to serialise a Person

无论你在连载什么，都会花费 4000 倍的时间。要么您的测试没有预热，要么您正在发送大量数据。如果是后者，我建议以二进制格式发送数据。

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// based on the example in the two-minute tutorial.
public class XStreamTest {
    public static class Person {
        private String firstname;
        private String lastname;
        private PhoneNumber phone;
        private PhoneNumber fax;

        public Person(String firstname, String lastname, PhoneNumber phone, PhoneNumber fax) {
            this.firstname = firstname;
            this.lastname = lastname;
            this.phone = phone;
            this.fax = fax;
        }
    }

    public static class PhoneNumber {
        private int code;
        private String number;

        public PhoneNumber(int code, String number) {
            this.code = code;
            this.number = number;
        }
    }

    public static void main(String... args) {
        XStream xstream = new XStream();
        xstream.alias("person", Person.class);
        xstream.alias("phonenumber", PhoneNumber.class);

        Person joe = new Person("Joe", "Walnes", new PhoneNumber(123, "1234-456"), new PhoneNumber(123, "9999-999"));

        final int warmup = 10000;
        final int runs = 20000;

        long start = 0;
        for (int i = -warmup; i < runs; i++) {
            if(i == 0) start = System.nanoTime();
            String xml = xstream.toXML(joe);
        }
        long time = System.nanoTime() - start;
        System.out.printf("Took %,d us on average to serialise a Person%n", time / runs / 1000);
    }
}