在Java中不使用任何凭据即可读取Google电子表格

，可以通过使用Google Sheets API来实现。Google Sheets API是一种RESTful API，允许开发者通过编程方式读取和修改Google电子表格。

要在Java中实现这个功能，可以按照以下步骤进行操作：

创建Google Cloud Platform (GCP) 项目并启用Google Sheets API：在GCP控制台中创建一个新项目，并启用Google Sheets API。获取API密钥和服务账号密钥。
添加所需的依赖项：在Java项目的构建文件中，添加Google Sheets API的依赖项。例如，使用Maven构建项目时，可以在pom.xml文件中添加以下依赖项：

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client</artifactId>
    <version>1.31.0</version>
</dependency>
<dependency>
    <groupId>com.google.oauth-client</groupId>
    <artifactId>google-oauth-client-jetty</artifactId>
    <version>1.31.0</version>
</dependency>
<dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-sheets</artifactId>
    <version>v4-rev581-1.25.0</version>
</dependency>

实现代码逻辑：使用Google Sheets API的Java客户端库，编写代码来读取Google电子表格。以下是一个简单的示例代码：

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.sheets.v4.Sheets;
import com.google.api.services.sheets.v4.SheetsScopes;
import com.google.api.services.sheets.v4.model.ValueRange;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.List;

public class GoogleSheetsReader {
    private static final String APPLICATION_NAME = "Google Sheets Reader";
    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
    private static final String SPREADSHEET_ID = "your-spreadsheet-id";
    private static final String RANGE = "Sheet1!A1:B2";

    public static void main(String[] args) {
        try {
            Sheets service = createSheetsService();
            List<List<Object>> values = readSheet(service, SPREADSHEET_ID, RANGE);
            if (values != null && !values.isEmpty()) {
                for (List<Object> row : values) {
                    for (Object cell : row) {
                        System.out.print(cell.toString() + "\t");
                    }
                    System.out.println();
                }
            } else {
                System.out.println("No data found.");
            }
        } catch (IOException | GeneralSecurityException e) {
            e.printStackTrace();
        }
    }

    private static Sheets createSheetsService() throws IOException, GeneralSecurityException {
        HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
        GoogleCredential credential = GoogleCredential.getApplicationDefault(httpTransport, JSON_FACTORY);
        if (credential.createScopedRequired()) {
            credential = credential.createScoped(Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY));
        }
        return new Sheets.Builder(httpTransport, JSON_FACTORY, credential)
                .setApplicationName(APPLICATION_NAME)
                .build();
    }

    private static List<List<Object>> readSheet(Sheets service, String spreadsheetId, String range) throws IOException {
        ValueRange response = service.spreadsheets().values()
                .get(spreadsheetId, range)
                .execute();
        return response.getValues();
    }
}

请注意，上述代码中的your-spreadsheet-id应替换为要读取的Google电子表格的实际ID。Sheet1!A1:B2是要读取的范围，可以根据需要进行修改。