我确实有深拷贝的需求，我之前的方案是实现了一个静态工具类，在工具类中通过FastJson序列化和反序列化实现深拷贝（我主要用在工具类中，性能问题并不在意），但是毕竟不是非常的方便。最近找资料时发现了几款工具，打算测试一下这几款工具。
commons-beanutils
依赖引入：
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<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.4</version>
</dependency>
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测试代码为：
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public class Test {
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
static class User {
private String name;
private Address address;
}
@NoArgsConstructor
@AllArgsConstructor
static class Address {
private String country;
private String province;
private String city;
}
public static void main(String[] args) {
User user1 = new User("test", new Address("a", "b", "c"));
User user2 = new User();
BeanUtils.copyProperties(user1, user2);
System.out.println(user1);
System.out.println(user2);
System.out.println(user1.address);
System.out.println(user2.address);
}
}
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输出为：
com.example.demo.test.Test$User@18e8568
com.example.demo.test.Test$User@33e5ccce
com.example.demo.test.Test$Address@5a42bbf4
com.example.demo.test.Test$Address@5a42bbf4
实际上只进行了浅拷贝。
orika
依赖引入：
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<dependency>
<groupId>ma.glasnost.orika</groupId>
<artifactId>orika-core</artifactId>
<version>1.5.4</version>
</dependency>
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测试代码编写：
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public class Test {
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
static class User {
private String name;
private Address address;
}
@NoArgsConstructor
@AllArgsConstructor
static class Address {
private String country;
private String province;
private String city;
}
public static void main(String[] args) {
User user1 = new User("test", new Address("a", "b", "c"));
User user2 = new User();
MapperFactory mapperFactory = new DefaultMapperFactory.Builder()
.useAutoMapping(true)
.mapNulls(true)
.build();
MapperFacade mapperFacade = mapperFactory.getMapperFacade();
mapperFacade.map(user1, user2);
System.out.println("mapperFacade.map(user1, user2)");
System.out.println(user1);
System.out.println(user2);
System.out.println(user1.address);
System.out.println(user2.address);
System.out.println("User user3 = mapperFacade.map(user1, User.class)");
User user3 = mapperFacade.map(user1, User.class);
System.out.println(user1);
System.out.println(user3);
System.out.println(user1.address);
System.out.println(user3.address);
}
}
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输出为：
mapperFacade.map(user1, user2)
com.example.demo.test.Test$User@6043cd28
com.example.demo.test.Test$User@4d3167f4
com.example.demo.test.Test$Address@76a3e297
com.example.demo.test.Test$Address@ed9d034
User user3 = mapperFacade.map(user1, User.class)
com.example.demo.test.Test$User@6043cd28
com.example.demo.test.Test$User@1060b431
com.example.demo.test.Test$Address@76a3e297
com.example.demo.test.Test$Address@612679d6
可以看到是深拷贝。这个工具略微有点麻烦，需要开发成静态工具类，但是看推荐，说是效率极高。
这两款都是浅拷贝，这款就不呈现测试代码了。
测试总结
我觉得orika是有研究价值的，深度拷贝的应用还是蛮多的，我会花时间对这门技术进行系统学习。
参考资料
- java浅拷贝与深拷贝及拷贝工具推荐