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springboot上传文件显示上传进度
- 创建maven依赖
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
- 新建实体类
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
public class ProgressEntity {
/** * 读取的文件的比特数 */
private long bytesRead = 0L;
/** * 文件的总大小 */
private long contentLength = 0L;
/** * 目前正在读取第几个文件 */
private int items;
/** * 开始上传时间,用于计算上传速率 */
private long startTime = System.currentTimeMillis();
}
- 新建监听器
/** * * @author Administrator * * 要获得上传文件的实时详细信息,必须继承org.apache.commons.fileupload.ProgressListener类, * 获得信息的时候将进度条对象Progress放在该监听器的session对象中 */
@Component
public class FileUploadProgressListener implements ProgressListener {
private HttpSession session;
public void setSession(HttpSession session){
this.session=session;
//保存上传状态
ProgressEntity progressEntity = new ProgressEntity();
session.setAttribute("progressEntity", progressEntity);
}
@Override
public void update(long bytesRead, long contentLength, int items) {
ProgressEntity progressEntity = (ProgressEntity) session.getAttribute("progressEntity");
//已读取数据长度
progressEntity.setBytesRead(bytesRead);
//文件总长度
progressEntity.setContentLength(contentLength);
//正在保存第几个文件
progressEntity.setItems(items);
}
}
- 新建文件解析器
/** * @author Administrator * * SpringMVC默认有一个文件解析器CommonsMultipartResolver用来解析上传的文件,我们需要重写该类, * 自己重写的监听器放到org.apache.commons.fileupload.FileUpload中,还需要将session放到自定义的监听器中 */
public class CustomMultipartResolver extends CommonsMultipartResolver {
/** * 注入第二步写的FileUploadProgressListener * 此处一定要检查是否注入成功了,不成功的话会报错 */
@Autowired
private FileUploadProgressListener progressListener;
public void setProgressListener(FileUploadProgressListener progressListener) {
this.progressListener = progressListener;
}
@Override
public MultipartParsingResult parseRequest(HttpServletRequest request) throws MultipartException {
String encoding = determineEncoding(request);
FileUpload fileUpload = prepareFileUpload(encoding);
progressListener.setSession(request.getSession());
fileUpload.setProgressListener(progressListener);
try {
List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
return parseFileItems(fileItems, encoding);
} catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
} catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart servlet request", ex);
}
}
}
- 指定自定义解析器
@Configuration
public class CorsConfig implements WebMvcConfigurer {
/** * 指定自定义解析器 * 将 multipartResolver 指向我们刚刚创建好的继承 CustomMultipartResolver 类的 自定义文件上传处理类 * * @return */
@Bean(name = "multipartResolver")
public MultipartResolver multipartResolver() {
return new CustomMultipartResolver();
}
}
- 控制器调用方法
/** * 获取上传进度 * * @return */
@GetMapping(value = "/uploadStatus")
@ApiOperation("获取上传进度")
public Object uploadStatus() {
HttpServletRequest request = HttpContextUtils.getHttpServletRequest();
HttpSession session = request.getSession();
ProgressEntity percent = (ProgressEntity) session.getAttribute("progressEntity");
// System.out.println("^^^^"+percent.toString());
//当前时间
long nowTime = System.currentTimeMillis();
//已传输的时间
long time = (nowTime - percent.getStartTime())/1000+1;
//传输速度 ;单位:byte/秒
double velocity =((double) percent.getBytesRead())/(double)time;
//估计总时间
double totalTime = percent.getContentLength()/velocity;
//估计剩余时间
double timeLeft = totalTime - time;
//已经完成的百分比
int percent1 = (int)(100 * (double) percent.getBytesRead() / (double) percent.getContentLength());
//已经完成数单位:m
double length = ((double) percent.getBytesRead())/1024/1024;
//总长度 M
double totalLength = (double) percent.getContentLength()/1024/1024;
StringBuffer sb = new StringBuffer();
//拼接上传信息传递到jsp中
sb.append(percent+":"+length+":"+totalLength+":"+velocity+":"+time+":"+totalTime+":"+timeLeft+":"+percent.getItems());
System.out.println("百分比====>"+percent1);
System.out.println("已传输时间====>"+time+"------剩余时间--->"+timeLeft+"======已经完成===="+length);
return null;
}
原文链接:https://blog.csdn.net/FurtherSkyQ/article/details/98200965
发布者:全栈程序员-用户IM,转载请注明出处:https://javaforall.cn/136756.html原文链接:https://javaforall.cn
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