若依框架怎么实现根据id下载上传的图片或者是文件,并且压缩成zip格式下载
你可以试着看一下代码生成那块,,那个生成下载下来就是zip
不知道你这个问题是否已经解决, 如果还没有解决的话:获取 zip数据流
。
public ResponseInfo exportPhoto(HttpServletResponse response) throws IOException {
//获取员工照片map
Map<String, String> photoMap = personService.findPhotoInfo();
response.setContentType("application/x-download;charset=UTF-8");
response.addHeader("Content-disposition", "filename=employee.xls");
ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream());
Iterator<Map.Entry<String, String>> entryIterator = photoMap.entrySet().iterator();
FileInputStream fis;
ZipEntry zipEntry;
File file;
Map.Entry<String, String> entry;
while (entryIterator.hasNext()) {
entry = entryIterator.next();
zipEntry = new ZipEntry(entry.getKey() + ".jpg");
zipOut.putNextEntry(zipEntry);
file = new File(realPathResolver.get(entry.getValue()));
try {
fis = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
continue;
}
byte[] bytes = new byte[1024];
int len = 0;
while ((len = fis.read(bytes)) != -1) {
zipOut.write(bytes, 0, len);
}
fis.close();
}
zipOut.close();
return new ResponseInfo();
}
对于这个问题,可以使用若依框架提供的文件上传和下载功能来实现。以下是具体的解决方案:
<input type="file" id="fileInput" multiple>
import org.springblade.core.oss.OssTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
@RestController
public class FileController {
@Autowired
private OssTemplate ossTemplate;
@PostMapping("/upload")
public String uploadFile(@RequestParam("file") MultipartFile file) {
// 使用OssTemplate将文件上传至对象存储服务(如阿里云OSS)
String url = ossTemplate.upload(file);
return url; // 返回上传后的文件URL
}
}
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
@RestController
public class DownloadController {
@Autowired
private OssTemplate ossTemplate;
@GetMapping("/download/{id}")
public void downloadFiles(@PathVariable("id") Long id, HttpServletResponse response) throws IOException {
List<String> fileUrls = getFilesByUserId(id); // 根据用户id获取上传的文件URL列表
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"files.zip\"");
try (ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream())) {
for (String fileUrl : fileUrls) {
File file = ossTemplate.download(fileUrl); // 根据文件URL下载文件到服务器
FileInputStream fileIn = new FileInputStream(file);
ZipEntry zipEntry = new ZipEntry(file.getName());
zipOut.putNextEntry(zipEntry);
IOUtils.copy(fileIn, zipOut);
fileIn.close();
file.delete(); // 删除下载的临时文件
}
}
response.flushBuffer();
}
private List<String> getFilesByUserId(Long userId) {
// 根据用户id获取上传的文件URL列表的具体实现
}
}
以上就是使用若依框架实现根据id下载上传的图片或文件并压缩为zip格式的解决方案。请根据自己的需求进行相应的修改和完善。如果需要更多的具体代码实现或配置说明,请提供更详细的问题描述。