base64转multipartfile pdf格式文件
时间: 2023-12-10 14:50:03 浏览: 34
将base64编码转换为multipartfile格式的pdf文件,可以按照以下步骤进行:
1. 将base64编码字符串解码为byte数组:
```java
byte[] pdfBytes = Base64.getDecoder().decode(base64String);
```
2. 创建MultipartFile对象:
```java
MultipartFile multipartFile = new MockMultipartFile("file.pdf", "file.pdf", "application/pdf", pdfBytes);
```
3. 现在,你可以使用multipartFile对象进行文件上传等操作了。
注意:这里的MockMultipartFile是Spring框架的测试类,如果在实际代码中使用,需要替换为适当的MultipartFile实现。
相关问题
base64转MultipartFile使用fdfs文件上传
你可以使用Java中的`base64`编码将字符串转换为字节数组,然后将字节数组转换为`MultipartFile`对象,以便使用FastDFS进行文件上传。下面是一个示例代码:
```java
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;
import java.io.ByteArrayInputStream;
import java.io.IOException;
public class Base64ToMultipartFileUtil {
public static MultipartFile base64ToMultipartFile(String base64String) throws IOException {
BASE64Decoder decoder = new BASE64Decoder();
byte[] bytes = decoder.decodeBuffer(base64String);
// 将字节数组转换为MultipartFile对象
MultipartFile multipartFile = new MockMultipartFile("file", "filename.jpg", "image/jpeg", new ByteArrayInputStream(bytes));
return multipartFile;
}
}
```
在上面的示例代码中,`base64ToMultipartFile`方法接受一个Base64编码的字符串作为输入,并返回一个`MultipartFile`对象。你需要使用`sun.misc.BASE64Decoder`类来解码Base64字符串,然后将解码后的字节数组包装在`ByteArrayInputStream`中,并将其传递给`MockMultipartFile`构造函数。
请注意,上述示例代码使用了Spring Framework的`MockMultipartFile`类来创建`MultipartFile`对象。如果你不使用Spring Framework,你可以自己实现一个类似的`MultipartFile`对象。
完成上述代码后,你就可以使用得到的`MultipartFile`对象调用FastDFS的文件上传接口来上传文件了。具体的上传过程和FastDFS的配置请参考相关文档。
base64转multipartfile文件
将Base64编码的字符串转换为MultipartFile文件,需要进行以下步骤:
1. 将Base64编码的字符串解码为字节数组。
2. 创建一个临时文件,将字节数组写入文件中。
3. 使用MultipartFile类的实现类,如CommonsMultipartFile,将临时文件转换为MultipartFile文件。
以下是示例代码:
```
import org.apache.commons.codec.binary.Base64;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class Base64ToMultipartFile {
public static MultipartFile convert(String base64String) throws IOException {
byte[] bytes = Base64.decodeBase64(base64String);
File tempFile = File.createTempFile("temp", null);
try (FileOutputStream fos = new FileOutputStream(tempFile)) {
fos.write(bytes);
}
return new CommonsMultipartFile(tempFile);
}
}
```
使用示例:
```
String base64String = "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