DTO转DOMAIN动态转换类。

package dtotransfer.util;

import dtotransfer.annotation.DomainField;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class DtoFieldConveter {

    public static Object fill(Object source, Class<?> targetClass) throws Exception {
        Class<?> sourceCls = source.getClass();

        Field[] sourceFields = sourceCls.getDeclaredFields();
        Field[] targetFields = targetClass.getDeclaredFields();
        Object targetObject = targetClass.newInstance();

        for (Field sourceField : sourceFields) {
            Annotation[] sourceFieldAnnotations = sourceField.getAnnotations();

            for (Annotation sourceFieldAnno : sourceFieldAnnotations) {
                if (sourceFieldAnno.annotationType() == DomainField.class) {
                    DomainField anno = (DomainField) sourceFieldAnno;
                    if (anno.targetClass() == targetClass) {
                        for (Field targetField : targetFields) {
                            if (targetField.getName().equals(anno.targetProperty())) {
                                Method sourceMethod = sourceCls.getMethod("get" + sourceField.getName()
                                        .substring(0, 1).toUpperCase()
                                        + sourceField.getName().substring(1));
                                Method targetMethod = targetClass.getMethod("set" + targetField.getName()
                                        .substring(0, 1).toUpperCase()
                                        + targetField.getName().substring(1),sourceField.getType());
                                Object sourceFieldValue = sourceMethod.invoke(source);
                                targetMethod.invoke(targetObject, sourceFieldValue);
//                                targetField.setAccessible(true);
//                                targetField.set(targetObject, sourceField.get(source));
                            }
                        }
                    }
                }
            }
        }
        return targetObject;
    }
}

package dtotransfer.annotation;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Target({FIELD})
@Retention(RUNTIME)
public @interface DomainField {

    Class<?> targetClass();

    String targetProperty();

//    String [] targetProperties();
}

把DTO实体和DOMAIN实体映射起来，字段名称可不同。

package dtotransfer.dto;

import dtotransfer.annotation.DomainField;
import dtotransfer.domain.AdminActivity;

public class AddTenantInfoRequestDTO {

    @DomainField(targetClass = AdminActivity.class, targetProperty = "description")
    private String tenantName;

    @DomainField(targetClass = AdminActivity.class, targetProperty = "ip")
    private String businessName;

    private String principal;

    private String principalPhone;

    public String getTenantName() {
        return tenantName;
    }

    public void setTenantName(String tenantName) {
        this.tenantName = tenantName;
    }

    public String getBusinessName() {
        return businessName;
    }

    public void setBusinessName(String businessName) {
        this.businessName = businessName;
    }

    public String getPrincipal() {
        return principal;
    }

    public void setPrincipal(String principal) {
        this.principal = principal;
    }

    public String getPrincipalPhone() {
        return principalPhone;
    }

    public void setPrincipalPhone(String principalPhone) {
        this.principalPhone = principalPhone;
    }
}

package dtotransfer.util;

import dtotransfer.domain.AdminActivity;
import dtotransfer.dto.AddTenantInfoRequestDTO;

public class DtoDomainMapping {

    public static void main(String []args) throws Exception
    {
        AddTenantInfoRequestDTO requestDTO=new AddTenantInfoRequestDTO();
        requestDTO.setBusinessName("yang");
        requestDTO.setTenantName("127.0.0.1");

       Object object= DtoFieldConveter.fill(requestDTO,AdminActivity.class);
    }
}