Spire.Cloud.PDF API提供了PdfAttachmentsApi接口支持添加附件addAttachment()、下载附件downloadAttachment()、获取附件信息getAttachmentsInfo()等，本文将通过Java代码示例介绍具体实现方法。详细内容参考以下步骤：

一、导入jar

创建maven程序，并通过maven仓库安装Spire.Cloud.SDK.jar包及其依赖。详细步骤可参考这篇文章。

二、登录冰蓝云账号，创建文件夹，上传文档

三、创建应用程序，获取App ID及App Key

四、Java代码示例

1、添加附件

import spire.cloud.pdf.sdk.ApiException;
import spire.cloud.pdf.sdk.Configuration;
import spire.cloud.pdf.sdk.api.PdfAttachmentsApi;

import java.io.File;

public class AddAttachment {
//配置账号信息
    static String appId = "App ID";
    static String appKey = "App Key";
    static String baseUrl= "https://api.e-iceblue.cn";
    static Configuration configuration = new Configuration(appId, appKey, baseUrl);
    static PdfAttachmentsApi pdfAttachmentsApi = new PdfAttachmentsApi(configuration);

    public static void main(String[] args) throws ApiException {
        String name = "sample.pdf";//用于测试的PDF源文档
        String outPath = "output/AddAttachment.pdf";//结果文档路径（结果文档保存在云端output文件夹下）
        File file = new File("test.docx");//加载附件文档
        String attachmentFileName = "AddAttachment.docx";//设置附件文档名称
        String attachmentDescription = "A Nice File";//附件描述
        String folder = "input";//源文档所在文件夹
        String storage = null;//冰蓝云提供的2G免费云存储空间
        String password = null;//源文档密码

        //调用方法添加附件
        pdfAttachmentsApi.addAttachment(name, outPath, file, attachmentFileName, attachmentDescription, folder, storage, password);
    }
}

附件添加结果：

2. 下载附件文档（以上文中生成的PDF文档为例，读取添加的Word文档附件）

import spire.cloud.pdf.sdk.ApiException;
import spire.cloud.pdf.sdk.Configuration;
import spire.cloud.pdf.sdk.api.PdfAttachmentsApi;

import java.io.File;

public class DownloadAttachment {
    //配置账号信息
    static String appId = "App ID";
    static String appKey = "App Key";
    static String baseUrl= "https://api.e-iceblue.cn";
    static Configuration configuration = new Configuration(appId, appKey, baseUrl);
    static PdfAttachmentsApi pdfAttachmentsApi = new PdfAttachmentsApi(configuration);

    public static void main(String[] args) throws ApiException {
        String name = "AddAttachment.pdf";//包含附件的PDF源文档
        Integer orderNumber = 1;
        String folder = "output";//源文档所在云端文件夹
        String storage = null;//冰蓝云提供的2G免费云存储空间
        String password = null;//源文档密码

        //调用方法下载PDF文档中的附件文档
        File response = pdfAttachmentsApi.downloadAttachment(name, orderNumber, folder, storage, password);
        System.out.println(response);
    }
}

读取结果如下，可在路径中查看下载的附件文档：

3、获取附件信息

import spire.cloud.pdf.sdk.ApiException;
import spire.cloud.pdf.sdk.Configuration;
import spire.cloud.pdf.sdk.api.PdfAttachmentsApi;
import spire.cloud.pdf.sdk.model.Attachments;

public class GetAttachmentInfo {
    //配置账号信息
    static String appId = "App ID";
    static String appKey = "App Key";
    static String baseUrl= "https://api.e-iceblue.cn";
    static Configuration configuration = new Configuration(appId, appKey, baseUrl);
    static PdfAttachmentsApi pdfAttachmentsApi = new PdfAttachmentsApi(configuration);

    public static void main(String[] args) throws ApiException {
        String name = "AddAttachment.pdf";//包含附件的PDF源文档
        String folder = "output";//源文档所在文件夹
        String storage = null;//冰蓝云提供的2G云存储空间
        String password = null;//源文档密码

        //调用方法获取附件信息
        Attachments response = pdfAttachmentsApi.getAttachmentsInfo(name, folder, storage, password);
        System.out.println(response);
    }
}

信息读取结果：