在使用Java XStream进行对象映射时，可以通过定义不同的别名和映射规则来处理复杂对象的映射。以下是一个示例，演示了如何映射一个包含多个属性和对象的复杂对象：
import com.thoughtworks.xstream.XStream;public class Main { public static void main(String[] args) { XStream xstream = new XStream(); // 定义别名 xstream.alias("person", Person.class); xstream.alias("address", Address.class); // 添加字段映射 xstream.aliasField("firstName", Person.class, "firstName"); xstream.aliasField("lastName", Person.class, "lastName"); xstream.aliasField("street", Address.class, "street"); xstream.aliasField("city", Address.class, "city"); xstream.aliasField("zipCode", Address.class, "zipCode"); // 创建一个复杂对象 Person person = new Person("John", "Doe"); Address address = new Address("123 Main St", "Anytown", "12345"); person.setAddress(address); // 将复杂对象序列化为XML String xml = xstream.toXML(person); System.out.println(xml); // 将XML反序列化为复杂对象 Person person2 = (Person) xstream.fromXML(xml); System.out.println(person2); }}class Person { private String firstName; private String lastName; private Address address; public Person(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public void setAddress(Address address) { this.address = address; } @Override public String toString() { return "Person{" + "firstName='" + firstName + '\'' + ", lastName='" + lastName + '\'' + ", address=" + address + '}'; }}class Address { private String street; private String city; private String zipCode; public Address(String street, String city, String zipCode) { this.street = street; this.city = city; this.zipCode = zipCode; } @Override public String toString() { return "Address{" + "street='" + street + '\'' + ", city='" + city + '\'' + ", zipCode='" + zipCode + '\'' + '}'; }}在这个示例中，我们定义了两个类Person和Address，并使用XStream进行对象映射。通过定义别名和字段映射，我们可以将复杂对象序列化为XML，并将XML反序列化为复杂对象。
