下载resource中的PDF文件到本地

package com.chint.tools;

import java.io.*;

/**
*  @author  wanglf3
*  @date  2024-01-10
*  @vsrsion  1.0
**/

public class FileDownloadUtil {

    /**
* 输出指定文件的byte数组
*
*  @param  filePath 文件路径
*  @param  os 输出流
*  @return
 */
public static void writeBytes(String filePath, OutputStream os) throws IOException
    {
        FileInputStream fis = null;
        try
        {
            File file = new File(filePath);
            if (!file.exists())
            {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0)
            {
                os.write(b, 0, length);
            }
        }
        catch (IOException e)
        {
            throw e;
        }
        finally
        {
            if (os != null)
            {
                try
                {
                    os.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
            if (fis != null)
            {
                try
                {
                    fis.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }
}

• 目标下载这个resource/DISCResult 下的这个pdf

• 使用上面的类的进行下载操作

@GetMapping("/getDiscPdfFile")
public void downloadPdf(String discResult, HttpServletResponse response, HttpServletRequest request) {
    if (discResult == null) {
        Result.error("传入DISC测评结果不能为空");
    } else if (!(discResult.equals("C") ||
            discResult.equals("CD") ||
            discResult.equals("CS") ||
            discResult.equals("D") ||
            discResult.equals("DC") ||
            discResult.equals("DI") ||
            discResult.equals("I") ||
            discResult.equals("ID") ||
            discResult.equals("IS") ||
            discResult.equals("S") ||
            discResult.equals("SC") ||
            discResult.equals("SI") ||
            discResult.equals("34-Ability")
    )) {
        Result.error("传入DISC测评结果没有对应的类型");
    }

    String fileNameStr = null;
    if (discResult.equals("34-Ability")) {
        fileNameStr = "34-Ability.pdf";
    } else {
        fileNameStr = "DISC-ResultReport-" + discResult + ".pdf";
    }

    String pdfFilePath = DiscResultController.class.getResource("/DISCResult/" + fileNameStr).getFile();
    try {
        FileDownloadUtil.writeBytes(pdfFilePath, response.getOutputStream());

    } catch (IOException e) {
        e.printStackTrace();
        log.error("下载文件失败", e);
    }
}

• 最后用postman测试

下载完成