以下是一个使用Alfresco内容存储的示例代码解决方案：

1. 使用Java代码连接到Alfresco内容存储：

import org.alfresco.webservice.util.AuthenticationUtils;
import org.alfresco.webservice.util.WebServiceFactory;
import org.alfresco.webservice.repository.RepositoryServiceSoapBindingStub;

public class AlfrescoConnector {

    private static final String ALFRESCO_URL = "http://localhost:8080/alfresco/api";
    private static final String USERNAME = "admin";
    private static final String PASSWORD = "admin";

    public static void main(String[] args) {
        AuthenticationUtils.startSession(USERNAME, PASSWORD);
        RepositoryServiceSoapBindingStub repositoryService = WebServiceFactory.getRepositoryService();
        
        // Perform operations on Alfresco content store
        
        AuthenticationUtils.endSession();
    }
}

2. 使用Java代码上传文件到Alfresco内容存储：

import org.alfresco.webservice.util.ContentUtils;
import org.alfresco.webservice.types.Content;
import org.alfresco.webservice.types.NamedValue;
import org.alfresco.webservice.types.NamedValue[];;

public class AlfrescoFileUploader {

    public static void uploadFile(String filePath, String fileName, String folderPath) {
        Content content = ContentUtils.createContentFromFile(filePath);
        NamedValue[] properties = new NamedValue[]{};
        Content[] contents = new Content[]{content};
        
        repositoryService.update(new ParentReference(STORE, null, folderPath), properties, contents);
    }
}

3. 使用Java代码从Alfresco内容存储下载文件：

import org.alfresco.webservice.util.ContentUtils;

public class AlfrescoFileDownloader {

    public static void downloadFile(String filePath, String destinationPath) {
        Content content = repositoryService.read(new Predicate(new Reference[]{new Reference(STORE, null, filePath)}));
        ContentUtils.writeContentToFile(content, destinationPath);
    }
}

请注意，以上代码示例是基于Alfresco 5.x版本的Java Web服务客户端API编写的。您需要根据您所使用的Alfresco版本和API进行相应的调整。