在处理超过5GB大小的文件时，可以使用AWS SDK提供的MultipartUpload功能来解决。MultipartUpload可以将大文件分割成多个小部分进行并发上传，并在服务器端进行合并。

下面是一个使用Java SDK的代码示例：

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.InitiateMultipartUploadRequest;
import com.amazonaws.services.s3.model.InitiateMultipartUploadResult;
import com.amazonaws.services.s3.model.PartETag;
import com.amazonaws.services.s3.model.UploadPartRequest;
import com.amazonaws.services.s3.model.UploadPartResult;
import com.amazonaws.services.s3.model.CompleteMultipartUploadRequest;
import com.amazonaws.services.s3.model.CompleteMultipartUploadResult;
import com.amazonaws.services.s3.model.AbortMultipartUploadRequest;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class UploadLargeFile {
    public static void main(String[] args) {
        String bucketName = "your-bucket-name";
        String keyName = "your-file-key";
        String filePath = "path-to-your-file";
        int partSize = 5 * 1024 * 1024; // 5MB
        
        AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                .withCredentials(DefaultAWSCredentialsProviderChain.getInstance())
                .build();

        try {
            // Step 1: Initialize multipart upload
            InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(bucketName, keyName);
            InitiateMultipartUploadResult initResponse = s3Client.initiateMultipartUpload(initRequest);
            String uploadId = initResponse.getUploadId();

            // Step 2: Upload parts
            long fileSize = new File(filePath).length();
            long filePosition = 0;
            int partNumber = 1;
            List partETags = new ArrayList<>();

            while (filePosition < fileSize) {
                // Calculate part size
                long partSizeRemaining = fileSize - filePosition;
                int currentPartSize = (int) Math.min(partSize, partSizeRemaining);

                // Upload part
                UploadPartRequest uploadRequest = new UploadPartRequest()
                        .withBucketName(bucketName)
                        .withKey(keyName)
                        .withUploadId(uploadId)
                        .withPartNumber(partNumber)
                        .withFileOffset(filePosition)
                        .withFile(filePath)
                        .withPartSize(currentPartSize);
                UploadPartResult uploadResult = s3Client.uploadPart(uploadRequest);
                partETags.add(uploadResult.getPartETag());

                filePosition += currentPartSize;
                partNumber++;
            }

            // Step 3: Complete multipart upload
            CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest(bucketName, keyName, uploadId, partETags);
            CompleteMultipartUploadResult completeResult = s3Client.completeMultipartUpload(completeRequest);
            System.out.println("Upload complete. ETag: " + completeResult.getETag());

        } catch (AmazonServiceException e) {
            // Handle Amazon service errors
            e.printStackTrace();
        } catch (SdkClientException e) {
            // Handle client errors
            e.printStackTrace();
        }

        // Step 4: Abort multipart upload if it fails or is not completed
        s3Client.abortMultipartUpload(new AbortMultipartUploadRequest(bucketName, keyName, uploadId));
    }
}

在上面的示例中，bucketName是S3存储桶的名称，keyName是要上传的文件在存储桶中的键，filePath是要上传的文件路径，partSize是每个上传的部分的大小。可以根据需要调整这些参数。

代码中的注释提供了每个步骤的解释。首先，我们初始化上传，然后根据文件大小将文件分割为多个部分进行上传。最后，我们完成上传并获取ETag。

如果上传失败或没有完成，还提供了一个捕获异常的部分，以便可以中止上传。

请确保您已正确配置AWS SDK的凭据，以便能够访问和上传到S3存储桶中。