How to determine whether a file is an image in java

When uploading image files, we generally limit the size of the uploaded file, but we usually also determine the type of uploaded file.

There are many ways to determine the file type. For example, we can determine whether the file is an image type by judging the file extension.

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Judge by file suffix name

Specific code:

String extension = "";
int i = fileName.lastIndexOf('.');
if (i > 0) {
    extension = fileName.substring(i+1);
}
//...
if("jpg".equals(extension)){
    //your code
}

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