java - 在 Java Spring Rest api 中下载文件

Question

我想下载一个文件，为此我编写了以下代码:

public void downoadResume(@PathVariable("id") int id, HttpServletResponse response) {
try {
    Applicant applicant = applicantService.getOne(id);
    File file = new File(DocumentConstants.DOCUMENTS_PATH + "/" + applicant.getOriginalDocPath());
    // get your file as InputStream
    InputStreamReader is = new InputStreamReader(new FileInputStream(file.getAbsolutePath()));
    // copy it to response's OutputStream
    org.apache.commons.io.IOUtils.copy(is, response.getOutputStream());
    is.close();
    response.flushBuffer();
} catch (IOException ex) {
    ex.printStackTrace();
} catch (ResourceNotFoundException e) {
    e.printStackTrace();
}

}

但是我收到的是这种响应而不是文件，请检查:

PK!�?�*��[Content_Types].xml �(���Oo�@��H|k���i�8=��X*���8Y���3i�o��I�RLHs���罟��3��g��G�hc��e5?
�Z|�ߕE?��Q.��P\�޿��7    ��ꀵX�OR�^?WX�?O���"��K����� �&�R�@��VC̦��QkG��3��%��P7�[�Z���Պ�T>�ʥ�9T\�݃+���1�thO�n�����dk�xP���g���&���g��pƦ���V-���3���O��a�?ġ�H���NZ�?c�˓qz�V2Y�3b��k����'��F/}(�i�ߞ`�{��wK�ۦ�]?����Z��w"���߿�r��p�<����g�x!>
��H!�9�}/=
���a�<��𬜫��#:����� ^ ���gQ'sȒGe7�x���x���h�K��G̻ޑ���9C���o٭��/��PK!���N_rels/.rels �(����JA���a�}7�
"���H�w"����w̤ھ�� �P�^����O֛���;�<�aYՠ؛`G�kxm��PY�[��g
Gΰino�/<���<�1��ⳆA$>"f3��\�ȾT�?I    S?���������W����Y
ig�@��X6_�]7~
f��ˉ�ao�.b*lI�r?j)�,l0�%?�b�
6�i���D�_���,   �   ���|u�Z^t٢yǯ;!Y,}{�C��/h>��PK!����g�word/_rels/document.xml.rels �(����N�0��H�C�;�:`�n@�����N[��U�{{¦u۲K/��G����?���:��*4)K���H�+S��-{��c�#arQ�?�������b�� ��+��E>�q)+���?,AcƟ(�Z?m�!?E|8����`ӽ��<O�?��~�j|���Q�J�#ʥCGJp0�A�W�2a��m��s2~��OG����C��}�W������    a�z֯�n��H��?KG�?���e�cު�"�I�f�'�7,^?�����1r�'�;��*!���Fϔ�}�n,�?���?ܜ`Е��PQ,Q�?K���x߀��)�WT>)�:�88
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你能告诉我我在这段代码中做错了什么吗？

Answer 1

您需要设置响应 header 和内容类型，以触发浏览器将响应内容视为文件而不是网页:

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");      
response.setHeader("Content-Disposition", "attachment; filename=download.xlsx");