背景:已知Java拿到了一个PDF链接(http://xxx.xxx.pdf),直接把链接返给前端的话,前端是不能点击直接下载的,需要后端先把url转成文件流,再由前端下载,处理如下:
导入pom:
xml
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.24</version>
</dependency>
接口部分:
java
@GetMapping("/downloadPdf")
public void downloadPdf(@RequestParam String patentId, HttpServletResponse response) throws IOException {
String pdfLink = "http://xxx.xxx.pdf";
URL url = new URL(pdfLink);
try (InputStream inputStream = url.openStream();
PDDocument document = PDDocument.load(inputStream)) {
// 设置响应头
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "attachment;");
// 写入响应流
try (OutputStream outputStream = response.getOutputStream()) {
document.save(outputStream);
}
}
}
前端部分:
javascript
downloadPDF() {
let url = baseURL + "/xxx/xxx/downloadPdf?patentId=" + this.patent_id; // 对应后端接口
console.log(url);
axios({
method: 'get',
url: url,
responseType: 'blob', // 不加的话会白页
headers: {'Authorization': 'Bearer ' + getToken()}
})
.then(response => {
const blob = new Blob([response.data]);
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = `xxx.pdf`; // 下载的文件名字
link.click();
});
}
这样前端一点击,就能直接下载。