Aws Lambda Function上传文件(也适用从InputStream formData 获取文件)

不念不忘少年蓝@ 2024-04-18 23:26 22阅读 0赞

Lambda Function 本身是rest json 类型：

如果需要支持二进制文件，

请参考：看看这个例子：https://github.com/CorkHounds/multipart-fileupload-java-lambda/blob/master/src/main/java/fileupload/FileUploadFunctionHandler.java

**本身也支持从 request base64的inputstream中获取 文件**

重点需要后台设置：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4OTI5NTg5_size_16_color_FFFFFF_t_70][]

**重点说一次:**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4OTI5NTg5_size_16_color_FFFFFF_t_70 1][]

**请重新部署API**

在后台的body中 你会获取base64 位的二进制，需要转图片。

import org.apache.commons.codec.binary.Base64;
    import org.apache.commons.fileupload.MultipartStream;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;
    import java.io.InputStream;
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * @author: kingxt
     * @date: 2019/9/11 23:14
     * @description:
     */
    public class GetFileBodyUtil {
        private static final Logger LOGGER = LoggerFactory.getLogger(CheckDaemUtils.class);	
    	public static Map<String, Object> spliteFile(String boundarystr ,String filebody){
            try {
            	 byte[] bI = Base64.decodeBase64(filebody.getBytes());
            	 // utf-8 获取文件名
            	 String MULTIPART_BODY = new String(bI, "UTF-8");
            	 int start = MULTIPART_BODY.indexOf("filename=\"");
            	 String alter = MULTIPART_BODY.substring(start+"filename=\"".length());
            	 int alter2 = alter.indexOf("\"");
            	 String name = alter.substring(0,alter2);
            	 // LOGGER.debug("file name:{},body:{}",name,MULTIPART_BODY);
            	 Map<String, Object> fileMap = new HashMap<String, Object>();
            	 
            	 byte[] boundary = boundarystr.getBytes();
            	 //Create a ByteArrayInputStream
                 ByteArrayInputStream content = new ByteArrayInputStream(bI);
            
                 //Create a MultipartStream to process the form-data
                 MultipartStream multipartStream = new MultipartStream(content, boundary, bI.length, null);
             	
                 //Create a ByteArrayOutputStream
                 ByteArrayOutputStream out = new ByteArrayOutputStream();
             	
                 //Find first boundary in the MultipartStream
                 boolean nextPart = multipartStream.skipPreamble();
                 //Loop through each segment
                 while (nextPart) {
                     String header = multipartStream.readHeaders();
                     
                     //Log header for debugging
                     LOGGER.debug("Headers:");
                     LOGGER.debug(header);
                     
                     //Write out the file to our ByteArrayOutputStream
                     multipartStream.readBodyData(out);
                     //Get the next part, if any
                     nextPart = multipartStream.readBoundary();
                 }
                 
                 //Log completion of MultipartStream processing
                 LOGGER.debug("Data written to ByteStream");
                 
                 //Prepare an InputStream from the ByteArrayOutputStream
                 InputStream fis = new ByteArrayInputStream(out.toByteArray());
                 
                 fileMap.put("length", out.size());
                 fileMap.put("size", out.toByteArray().length);
                 LOGGER.debug("file size:{}",out.toByteArray().length);
    	   	     LOGGER.debug("file length:{}",out.toByteArray().length);
    	   	     fileMap.put("name", name);
    	   	     fileMap.put("inputStream", fis);
                 return fileMap;
            }catch (Exception e) {
                LOGGER.error("Validation error:{}",e);
            }
            return null;
        }
    }

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4OTI5NTg5_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/40941f2ddec94d65b1b25f7d7f518f0f.png