获取oss的pdf文件，返回文件输出流获取oss的pdf文件，返回文件输

获取oss的pdf文件，返回文件输出流
需求：oss上存储生成的pdf文件，通过存储的key，返回对应的PDF文件输出流

实现：后端Java提供获取pdf文件的输出流，前端vue将文件流另存为PDF文件

接口代码实现：

import java.io.BufferedInputStream; import java.io.InputStream; import java.util.Objects; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.aliyun.oss.model.OSSObject; import com.sisensing.cgm.common.core.utils.ErrUtil; import com.sisensing.cgm.system.domain.dto.ReportQueryDTO; import com.sisensing.cgm.system.service.ICgmDownloadService; import cn.hutool.core.io.IoUtil; import org.springframework.stereotype.Service; ......private static final Logger LOGGER = LoggerFactory.getLogger(CgmDownloadServiceServiceImpl.class); @Override public void getReportFileStream(ReportQueryDTO reportQueryDTO, HttpServletResponse response) { // 报告尚未生成pdf报告 ErrUtil.throwIfTrue(StringUtils.isEmpty(reportQueryDTO.getPdfKey()), REPORT_HAS_NOT_PDF, String.format("pdfKey不允许为空")); OSSObject ossObject = this.getServiceFactory().getOssService().downloadOssFile(reportQueryDTO.getPdfKey()); ServletOutputStream out = null; if (Objects.nonNull(ossObject)) { InputStream inputStream = ossObject.getObjectContent(); BufferedInputStream bis = new BufferedInputStream(inputStream); int buffer = 1024 * 10; byte[] data = https://www.it610.com/article/new byte[buffer]; try { response.setContentType("application/pdf"); // 文件名可以任意指定 long timeId = System.currentTimeMillis(); response.setHeader("Content-Disposition", "attachment; fileName=" + timeId + ".pdf"); int read; out = response.getOutputStream(); while ((read = bis.read(data)) != -1) { out.write(data, 0, read); } out.flush(); } catch (Exception ex) { IoUtil.close(out); LOGGER.error("下载PDF报告失败", ex); ErrUtil.throwNow(GET_REPORT_STREAM_FAIL, String.format("pdfKey为[%s]", reportQueryDTO.getPdfKey())); } finally { IoUtil.close(ossObject); } } }......@Autowired private OSSClient ossClient; @Autowired private OSSProperties ossProperties; /** * 下载oss存储的文件对象 * * @param key * @return */ public OSSObject downloadOssFile(String key) { return ossClient.getObject(ossProperties.getBucketName(), key); }

ps: 因为前端页面请求的方式是POST，若使用以下的方式将文件输出流保存

/**下载操作 */ handleDownload(row) { if (row.pdfKey) {//已生成pdf const param = { pdfKey : row.pdfKey}; getReportStream(param).then(res => { if(!res) return let url = window.URL.createObjectURL(new Blob([res]), { type: 'application/pdf' }) let link = document.createElement('a') link.style.display = 'none' link.href = https://www.it610.com/article/url link.setAttribute('download', `xxxx报告.pdf`) document.body.appendChild(link) link.click() document.body.removeChild(link) URL.revokeObjectURL(link.href) //释放URL对象 }) } else { this.$message('报告正在生成中请稍后') } }//获取报告文件输出流 export function getReportStream(data) { return request({ url: `xxx/xxx/pdf/stream`, method: 'post', data: data, responseType: 'blob', }) }

实现效果截图：