JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to download a file in Spring RestController?


Below example helps you to understand how to download a file in Spring RestController. This example assumes that you have already converted your file into byte array. The HttpEntity class helps you to wrap your file content as part of the response.

@ResponseStatus(HttpStatus.OK)
@RequestMapping(value = {"/download/excel-report"},
                method = RequestMethod.GET)
public HttpEntity<byte[]> downloadExcelReport() {

    /** assume that below line gives you file content in byte array **/
    byte[] excelContent = getReportContent();
    // prepare response
    HttpHeaders header = new HttpHeaders();
    header.setContentType(new MediaType("application", "vnd.openxmlformats-officedocument.spreadsheetml.sheet"));
    header.set(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=my_file.xls");
    header.setContentLength(excelContent.length);

    return new HttpEntity<byte[]>(excelContent, header);
}
                    

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Knowledge Centre
Can we override static method?
We cannot override static methods. Static methods are belogs to class, not belongs to object. Inheritance will not be applicable for class members
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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