# 使用数据类 { #using-dataclasses }

FastAPI 基于 **Pydantic** 构建，我已经向你展示过如何使用 Pydantic 模型声明请求与响应。

但 FastAPI 也支持以相同方式使用 [`dataclasses`](https://docs.python.org/3/library/dataclasses.html)：

{* ../../docs_src/dataclasses_/tutorial001_py310.py hl[1,6:11,18:19] *}

这仍然得益于 **Pydantic**，因为它对 [`dataclasses` 的内置支持](https://docs.pydantic.dev/latest/concepts/dataclasses/#use-of-stdlib-dataclasses-with-basemodel)。

import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.ResourceUtil;

import jakarta.annotation.PostConstruct;

/**
 * Helper class for managing HTTP requests using cURL-like operations.
 */
public class CurlHelper {

    /**
     * Default constructor.
     */
    public CurlHelper() {
        // Empty constructor
    }

import org.dbflute.util.DfCollectionUtil;
import org.opensearch.action.delete.DeleteRequestBuilder;
import org.opensearch.action.index.IndexRequestBuilder;

/**
 * @author ESFlute (using FreeGen)
 */
public abstract class EsAbstractEntity implements Entity, Serializable, Cloneable {

    // ===================================================================================

import org.dbflute.dbmeta.name.TableSqlName;
import org.dbflute.dbmeta.property.PropertyGateway;
import org.dbflute.dbway.DBDef;
import org.dbflute.util.DfTypeUtil;

/**
 * @author ESFlute (using FreeGen)
 */
public class CrawlingInfoParamDbm extends AbstractDBMeta {

    protected static final Class<?> suppressUnusedImportLocalDateTime = LocalDateTime.class;

import org.dbflute.cbean.ConditionQuery;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.index.query.QueryBuilder;

/**
 * @author ESFlute (using FreeGen)
 */
public class BsUserCB extends EsAbstractConditionBean {

    // ===================================================================================

import org.dbflute.util.DfCollectionUtil;
import org.opensearch.action.delete.DeleteRequestBuilder;
import org.opensearch.action.index.IndexRequestBuilder;

/**
 * @author ESFlute (using FreeGen)
 */
public abstract class EsAbstractEntity implements Entity, Serializable, Cloneable {

    // ===================================================================================

/**
 * Policy on choosing which connection to use for an exchange and any retries that follow. This uses
 * the following strategies:
 *
 *  1. If the current call already has a connection that can satisfy the request it is used. Using
 *     the same connection for an initial exchange and its follow-ups may improve locality.
 *
 *  2. If there is a connection in the pool that can satisfy the request it is used. Note that it is

        assertTrue(isPowerOfTwo(SecurityInfo.BACKUP_SECURITY_INFO));
    }

    @Test
    @DisplayName("Test combining security info flags")
    void testCombiningFlags() {
        // Test that flags can be combined using bitwise OR
        int combined = SecurityInfo.OWNER_SECURITY_INFO | SecurityInfo.GROUP_SECURITY_INFO;
        assertEquals(0x3, combined);

        combined = SecurityInfo.DACL_SECURITY_INFO | SecurityInfo.SACL_SECURITY_INFO;

import org.junit.jupiter.api.Test;

/**
 * Tests for SmbComWrite command - SMB write operations
 */
public class SmbComWriteTest {

    /**
     * Helper method to get private field value using reflection
     */
    private Object getFieldValue(Object obj, String fieldName) {
        try {
            Field field = SmbComWrite.class.getDeclaredField(fieldName);
            field.setAccessible(true);

    }

    @Test
    void sendResetsResponseAndForwards() throws Exception {
        SmbSession session = new SmbSession(addr, 445, inet, 0, auth);
        // prepare a dummy request/response using a real SMB block type
        ServerMessageBlock req = new SmbComOpenAndX("test.txt", 0, 0, null);
        ServerMessageBlock resp = new SmbComOpenAndX("test.txt", 0, 0, null);
        resp.received = true;