Java 如何在 Spring MVC 中实现 HTTP 字节范围请求
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28427339/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-08-11 06:13:38 来源:igfitidea点击:
How to Implement HTTP byte-range requests in Spring MVC
提问by gstackoverflow
I have the problem with video rewind on my site.
我在我的网站上遇到视频倒带问题。
I figure out that problem with http headers.
我发现了 http 标头的问题。
My current controller method which returns video:
我当前返回视频的控制器方法：
@RequestMapping(method = RequestMethod.GET, value = "/testVideo")
@ResponseBody
public FileSystemResource testVideo(Principal principal) throws IOException {
return new FileSystemResource(new File("D:\oceans.mp4"));
}
How to rewrite following code with byte-range supporting?
如何使用字节范围支持重写以下代码？
P.S.
聚苯乙烯
I have seen following example http://balusc.blogspot.in/2009/02/fileservlet-supporting-resume-and.html
我看过以下示例http://balusc.blogspot.in/2009/02/fileservlet-supporting-resume-and.html
But this code looks hard for me and I cannot understand it. I hope that in spring mvc exists way simpler.
但是这段代码对我来说很难看，我无法理解。我希望在 spring mvc 中存在的方式更简单。
采纳答案by Leandro Carracedo
The request for support for http byte-range was open at the time of this answer but is fixed in Spring 4.2.RC1. Check jira SPR-10805or, the PR here.
支持 http 字节范围的请求在此回答时已开放，但已在 Spring 4.2.RC1 中修复。检查 jira SPR-10805或此处的 PR 。
But based on the code that you linked in your question, Davin Kevin built a solutionthat could work for your request.
但是根据您在问题中链接的代码，Davin Kevin 构建了一个可以满足您请求的解决方案。
Code for MultipartFileSender:
MultipartFileSender 的代码：
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Created by kevin on 10/02/15.
* See full code here : https://github.com/davinkevin/Podcast-Server/blob/d927d9b8cb9ea1268af74316cd20b7192ca92da7/src/main/java/lan/dk/podcastserver/utils/multipart/MultipartFileSender.java
*/
public class MultipartFileSender {
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
private static final int DEFAULT_BUFFER_SIZE = 20480; // ..bytes = 20KB.
private static final long DEFAULT_EXPIRE_TIME = 604800000L; // ..ms = 1 week.
private static final String MULTIPART_BOUNDARY = "MULTIPART_BYTERANGES";
Path filepath;
HttpServletRequest request;
HttpServletResponse response;
public MultipartFileSender() {
}
public static MultipartFileSender fromPath(Path path) {
return new MultipartFileSender().setFilepath(path);
}
public static MultipartFileSender fromFile(File file) {
return new MultipartFileSender().setFilepath(file.toPath());
}
public static MultipartFileSender fromURIString(String uri) {
return new MultipartFileSender().setFilepath(Paths.get(uri));
}
//** internal setter **//
private MultipartFileSender setFilepath(Path filepath) {
this.filepath = filepath;
return this;
}
public MultipartFileSender with(HttpServletRequest httpRequest) {
request = httpRequest;
return this;
}
public MultipartFileSender with(HttpServletResponse httpResponse) {
response = httpResponse;
return this;
}
public void serveResource() throws Exception {
if (response == null || request == null) {
return;
}
if (!Files.exists(filepath)) {
logger.error("File doesn't exist at URI : {}", filepath.toAbsolutePath().toString());
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
Long length = Files.size(filepath);
String fileName = filepath.getFileName().toString();
FileTime lastModifiedObj = Files.getLastModifiedTime(filepath);
if (StringUtils.isEmpty(fileName) || lastModifiedObj == null) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
long lastModified = LocalDateTime.ofInstant(lastModifiedObj.toInstant(), ZoneId.of(ZoneOffset.systemDefault().getId())).toEpochSecond(ZoneOffset.UTC);
String contentType = "video/mp4";
// Validate request headers for caching ---------------------------------------------------
// If-None-Match header should contain "*" or ETag. If so, then return 304.
String ifNoneMatch = request.getHeader("If-None-Match");
if (ifNoneMatch != null && HttpUtils.matches(ifNoneMatch, fileName)) {
response.setHeader("ETag", fileName); // Required in 304.
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
// If-Modified-Since header should be greater than LastModified. If so, then return 304.
// This header is ignored if any If-None-Match header is specified.
long ifModifiedSince = request.getDateHeader("If-Modified-Since");
if (ifNoneMatch == null && ifModifiedSince != -1 && ifModifiedSince + 1000 > lastModified) {
response.setHeader("ETag", fileName); // Required in 304.
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
// Validate request headers for resume ----------------------------------------------------
// If-Match header should contain "*" or ETag. If not, then return 412.
String ifMatch = request.getHeader("If-Match");
if (ifMatch != null && !HttpUtils.matches(ifMatch, fileName)) {
response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
return;
}
// If-Unmodified-Since header should be greater than LastModified. If not, then return 412.
long ifUnmodifiedSince = request.getDateHeader("If-Unmodified-Since");
if (ifUnmodifiedSince != -1 && ifUnmodifiedSince + 1000 <= lastModified) {
response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
return;
}
// Validate and process range -------------------------------------------------------------
// Prepare some variables. The full Range represents the complete file.
Range full = new Range(0, length - 1, length);
List<Range> ranges = new ArrayList<>();
// Validate and process Range and If-Range headers.
String range = request.getHeader("Range");
if (range != null) {
// Range header should match format "bytes=n-n,n-n,n-n...". If not, then return 416.
if (!range.matches("^bytes=\d*-\d*(,\d*-\d*)*$")) {
response.setHeader("Content-Range", "bytes */" + length); // Required in 416.
response.sendError(HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE);
return;
}
String ifRange = request.getHeader("If-Range");
if (ifRange != null && !ifRange.equals(fileName)) {
try {
long ifRangeTime = request.getDateHeader("If-Range"); // Throws IAE if invalid.
if (ifRangeTime != -1) {
ranges.add(full);
}
} catch (IllegalArgumentException ignore) {
ranges.add(full);
}
}
// If any valid If-Range header, then process each part of byte range.
if (ranges.isEmpty()) {
for (String part : range.substring(6).split(",")) {
// Assuming a file with length of 100, the following examples returns bytes at:
// 50-80 (50 to 80), 40- (40 to length=100), -20 (length-20=80 to length=100).
long start = Range.sublong(part, 0, part.indexOf("-"));
long end = Range.sublong(part, part.indexOf("-") + 1, part.length());
if (start == -1) {
start = length - end;
end = length - 1;
} else if (end == -1 || end > length - 1) {
end = length - 1;
}
// Check if Range is syntactically valid. If not, then return 416.
if (start > end) {
response.setHeader("Content-Range", "bytes */" + length); // Required in 416.
response.sendError(HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE);
return;
}
// Add range.
ranges.add(new Range(start, end, length));
}
}
}
// Prepare and initialize response --------------------------------------------------------
// Get content type by file name and set content disposition.
String disposition = "inline";
// If content type is unknown, then set the default value.
// For all content types, see: http://www.w3schools.com/media/media_mimeref.asp
// To add new content types, add new mime-mapping entry in web.xml.
if (contentType == null) {
contentType = "application/octet-stream";
} else if (!contentType.startsWith("image")) {
// Else, expect for images, determine content disposition. If content type is supported by
// the browser, then set to inline, else attachment which will pop a 'save as' dialogue.
String accept = request.getHeader("Accept");
disposition = accept != null && HttpUtils.accepts(accept, contentType) ? "inline" : "attachment";
}
logger.debug("Content-Type : {}", contentType);
// Initialize response.
response.reset();
response.setBufferSize(DEFAULT_BUFFER_SIZE);
response.setHeader("Content-Type", contentType);
response.setHeader("Content-Disposition", disposition + ";filename=\"" + fileName + "\"");
logger.debug("Content-Disposition : {}", disposition);
response.setHeader("Accept-Ranges", "bytes");
response.setHeader("ETag", fileName);
response.setDateHeader("Last-Modified", lastModified);
response.setDateHeader("Expires", System.currentTimeMillis() + DEFAULT_EXPIRE_TIME);
// Send requested file (part(s)) to client ------------------------------------------------
// Prepare streams.
try (InputStream input = new BufferedInputStream(Files.newInputStream(filepath));
OutputStream output = response.getOutputStream()) {
if (ranges.isEmpty() || ranges.get(0) == full) {
// Return full file.
logger.info("Return full file");
response.setContentType(contentType);
response.setHeader("Content-Range", "bytes " + full.start + "-" + full.end + "/" + full.total);
response.setHeader("Content-Length", String.valueOf(full.length));
Range.copy(input, output, length, full.start, full.length);
} else if (ranges.size() == 1) {
// Return single part of file.
Range r = ranges.get(0);
logger.info("Return 1 part of file : from ({}) to ({})", r.start, r.end);
response.setContentType(contentType);
response.setHeader("Content-Range", "bytes " + r.start + "-" + r.end + "/" + r.total);
response.setHeader("Content-Length", String.valueOf(r.length));
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); // 206.
// Copy single part range.
Range.copy(input, output, length, r.start, r.length);
} else {
// Return multiple parts of file.
response.setContentType("multipart/byteranges; boundary=" + MULTIPART_BOUNDARY);
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); // 206.
// Cast back to ServletOutputStream to get the easy println methods.
ServletOutputStream sos = (ServletOutputStream) output;
// Copy multi part range.
for (Range r : ranges) {
logger.info("Return multi part of file : from ({}) to ({})", r.start, r.end);
// Add multipart boundary and header fields for every range.
sos.println();
sos.println("--" + MULTIPART_BOUNDARY);
sos.println("Content-Type: " + contentType);
sos.println("Content-Range: bytes " + r.start + "-" + r.end + "/" + r.total);
// Copy single part range of multi part range.
Range.copy(input, output, length, r.start, r.length);
}
// End with multipart boundary.
sos.println();
sos.println("--" + MULTIPART_BOUNDARY + "--");
}
}
}
private static class Range {
long start;
long end;
long length;
long total;
/**
* Construct a byte range.
* @param start Start of the byte range.
* @param end End of the byte range.
* @param total Total length of the byte source.
*/
public Range(long start, long end, long total) {
this.start = start;
this.end = end;
this.length = end - start + 1;
this.total = total;
}
public static long sublong(String value, int beginIndex, int endIndex) {
String substring = value.substring(beginIndex, endIndex);
return (substring.length() > 0) ? Long.parseLong(substring) : -1;
}
private static void copy(InputStream input, OutputStream output, long inputSize, long start, long length) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int read;
if (inputSize == length) {
// Write full range.
while ((read = input.read(buffer)) > 0) {
output.write(buffer, 0, read);
output.flush();
}
} else {
input.skip(start);
long toRead = length;
while ((read = input.read(buffer)) > 0) {
if ((toRead -= read) > 0) {
output.write(buffer, 0, read);
output.flush();
} else {
output.write(buffer, 0, (int) toRead + read);
output.flush();
break;
}
}
}
}
}
private static class HttpUtils {
/**
* Returns true if the given accept header accepts the given value.
* @param acceptHeader The accept header.
* @param toAccept The value to be accepted.
* @return True if the given accept header accepts the given value.
*/
public static boolean accepts(String acceptHeader, String toAccept) {
String[] acceptValues = acceptHeader.split("\s*(,|;)\s*");
Arrays.sort(acceptValues);
return Arrays.binarySearch(acceptValues, toAccept) > -1
|| Arrays.binarySearch(acceptValues, toAccept.replaceAll("/.*$", "/*")) > -1
|| Arrays.binarySearch(acceptValues, "*/*") > -1;
}
/**
* Returns true if the given match header matches the given value.
* @param matchHeader The match header.
* @param toMatch The value to be matched.
* @return True if the given match header matches the given value.
*/
public static boolean matches(String matchHeader, String toMatch) {
String[] matchValues = matchHeader.split("\s*,\s*");
Arrays.sort(matchValues);
return Arrays.binarySearch(matchValues, toMatch) > -1
|| Arrays.binarySearch(matchValues, "*") > -1;
}
}
}
Use in Controller:
在控制器中使用：
MultipartFileSender.fromPath(pathtofile)
.with(httprequest)
.with(httpresponse)
.serveResource();
回答by Uttesh Kumar
Try this simple code .
试试这个简单的代码。
@GET
@Produces({"application/octet-stream"})
public Response getFile() {
File file = ...
return Response.ok(file, MediaType.APPLICATION_OCTET_STREAM)
.header("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"" ) .build();
}
Update :
更新 ：
Its wrapping the Spring Jersey jersey.java.net RESTful implementation with spring MVC.
它用 spring MVC 包装了 Spring Jersey jersey.java.net RESTful 实现。
For pure Spring mvc use below code.
对于纯 Spring mvc，请使用以下代码。
@RequestMapping("/video") public ResponseEntity<byte[]> getvideo() throws IOException {
InputStream in = ...
final HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>IOUtils.toByteArray(in),headers,HttpStatus.CREATED);
}
IOUtils is from apache common jar
IOUtils 来自 apache common jar
回答by Kevin Davin
If you want to avoid MimeTypeUtils, you can use Files.probeContentType(Path path). That will use the default implementation of the system.
如果你想避免MimeTypeUtils，你可以使用Files.probeContentType(Path path). 这将使用系统的默认实现。
回答by user2059379
Depending on what you're trying to achieve, it may make sense for you to map the request by to the container's default servlet.
根据您要实现的目标，将请求映射到容器的默认 servlet 可能是有意义的。
I.e., during initialization:
即，在初始化期间：
ServletContext container = ...
// Map *.mp4 to the default servlet to support range requests
ServletRegistration servletRegistration = container.getServletRegistration("default");
servletRegistration.addMapping("*.mp4");
回答by Jamaslab
The answer of Leandro worked perfectly for me. I only changed the InputStream with a RandomAccessFile, it is performing better to access a random point inside a file.
Leandro 的回答对我来说非常有效。我只使用 RandomAccessFile 更改了 InputStream，访问文件中的随机点性能更好。
Here is the class MultipartFileSender
这是类 MultipartFileSender
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MultipartFileSender {
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
private static final int DEFAULT_BUFFER_SIZE = 20480; // ..bytes = 20KB.
private static final long DEFAULT_EXPIRE_TIME = 604800000L; // ..ms = 1 week.
private static final String MULTIPART_BOUNDARY = "MULTIPART_BYTERANGES";
Path filepath;
HttpServletRequest request;
HttpServletResponse response;
public MultipartFileSender() {
}
public static MultipartFileSender fromPath(Path path) {
return new MultipartFileSender().setFilepath(path);
}
public static MultipartFileSender fromFile(File file) {
return new MultipartFileSender().setFilepath(file.toPath());
}
public static MultipartFileSender fromURIString(String uri) {
return new MultipartFileSender().setFilepath(Paths.get(uri));
}
//** internal setter **//
private MultipartFileSender setFilepath(Path filepath) {
this.filepath = filepath;
return this;
}
public MultipartFileSender with(HttpServletRequest httpRequest) {
request = httpRequest;
return this;
}
public MultipartFileSender with(HttpServletResponse httpResponse) {
response = httpResponse;
return this;
}
public void serveResource() throws Exception {
if (response == null || request == null) {
return;
}
if (!Files.exists(filepath)) {
logger.error("File doesn't exist at URI : {}", filepath.toAbsolutePath().toString());
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
Long length = Files.size(filepath);
String fileName = filepath.getFileName().toString();
FileTime lastModifiedObj = Files.getLastModifiedTime(filepath);
if (StringUtils.isEmpty(fileName) || lastModifiedObj == null) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
long lastModified = LocalDateTime.ofInstant(lastModifiedObj.toInstant(), ZoneId.of(ZoneOffset.systemDefault().getId())).toEpochSecond(ZoneOffset.UTC);
String contentType = "video/mp4";
// Validate request headers for caching ---------------------------------------------------
// If-None-Match header should contain "*" or ETag. If so, then return 304.
String ifNoneMatch = request.getHeader("If-None-Match");
if (ifNoneMatch != null && HttpUtils.matches(ifNoneMatch, fileName)) {
response.setHeader("ETag", fileName); // Required in 304.
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
// If-Modified-Since header should be greater than LastModified. If so, then return 304.
// This header is ignored if any If-None-Match header is specified.
long ifModifiedSince = request.getDateHeader("If-Modified-Since");
if (ifNoneMatch == null && ifModifiedSince != -1 && ifModifiedSince + 1000 > lastModified) {
response.setHeader("ETag", fileName); // Required in 304.
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
// Validate request headers for resume ----------------------------------------------------
// If-Match header should contain "*" or ETag. If not, then return 412.
String ifMatch = request.getHeader("If-Match");
if (ifMatch != null && !HttpUtils.matches(ifMatch, fileName)) {
response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
return;
}
// If-Unmodified-Since header should be greater than LastModified. If not, then return 412.
long ifUnmodifiedSince = request.getDateHeader("If-Unmodified-Since");
if (ifUnmodifiedSince != -1 && ifUnmodifiedSince + 1000 <= lastModified) {
response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
return;
}
// Validate and process range -------------------------------------------------------------
// Prepare some variables. The full Range represents the complete file.
Range full = new Range(0, length - 1, length);
List<Range> ranges = new ArrayList<>();
// Validate and process Range and If-Range headers.
String range = request.getHeader("Range");
if (range != null) {
// Range header should match format "bytes=n-n,n-n,n-n...". If not, then return 416.
if (!range.matches("^bytes=\d*-\d*(,\d*-\d*)*$")) {
response.setHeader("Content-Range", "bytes */" + length); // Required in 416.
response.sendError(HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE);
return;
}
String ifRange = request.getHeader("If-Range");
if (ifRange != null && !ifRange.equals(fileName)) {
try {
long ifRangeTime = request.getDateHeader("If-Range"); // Throws IAE if invalid.
if (ifRangeTime != -1) {
ranges.add(full);
}
} catch (IllegalArgumentException ignore) {
ranges.add(full);
}
}
// If any valid If-Range header, then process each part of byte range.
if (ranges.isEmpty()) {
for (String part : range.substring(6).split(",")) {
// Assuming a file with length of 100, the following examples returns bytes at:
// 50-80 (50 to 80), 40- (40 to length=100), -20 (length-20=80 to length=100).
long start = Range.sublong(part, 0, part.indexOf("-"));
long end = Range.sublong(part, part.indexOf("-") + 1, part.length());
if (start == -1) {
start = length - end;
end = length - 1;
} else if (end == -1 || end > length - 1) {
end = length - 1;
}
// Check if Range is syntactically valid. If not, then return 416.
if (start > end) {
response.setHeader("Content-Range", "bytes */" + length); // Required in 416.
response.sendError(HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE);
return;
}
// Add range.
ranges.add(new Range(start, end, length));
}
}
}
// Prepare and initialize response --------------------------------------------------------
// Get content type by file name and set content disposition.
String disposition = "inline";
// If content type is unknown, then set the default value.
// For all content types, see: http://www.w3schools.com/media/media_mimeref.asp
// To add new content types, add new mime-mapping entry in web.xml.
if (contentType == null) {
contentType = "application/octet-stream";
} else if (!contentType.startsWith("image")) {
// Else, expect for images, determine content disposition. If content type is supported by
// the browser, then set to inline, else attachment which will pop a 'save as' dialogue.
String accept = request.getHeader("Accept");
disposition = accept != null && HttpUtils.accepts(accept, contentType) ? "inline" : "attachment";
}
logger.debug("Content-Type : {}", contentType);
// Initialize response.
response.reset();
response.setBufferSize(DEFAULT_BUFFER_SIZE);
response.setHeader("Content-Type", contentType);
response.setHeader("Content-Disposition", disposition + ";filename=\"" + fileName + "\"");
logger.debug("Content-Disposition : {}", disposition);
response.setHeader("Accept-Ranges", "bytes");
response.setHeader("ETag", fileName);
response.setDateHeader("Last-Modified", lastModified);
response.setDateHeader("Expires", System.currentTimeMillis() + DEFAULT_EXPIRE_TIME);
// Send requested file (part(s)) to client ------------------------------------------------
// Prepare streams.
try (RandomAccessFile input = new RandomAccessFile(filepath.toFile(), "r");
OutputStream output = response.getOutputStream()) {
if (ranges.isEmpty() || ranges.get(0) == full) {
// Return full file.
logger.info("Return full file");
response.setContentType(contentType);
response.setHeader("Content-Range", "bytes " + full.start + "-" + full.end + "/" + full.total);
response.setHeader("Content-Length", String.valueOf(full.length));
Range.copy(input, output, length, full.start, full.length);
} else if (ranges.size() == 1) {
// Return single part of file.
Range r = ranges.get(0);
logger.info("Return 1 part of file : from ({}) to ({})", r.start, r.end);
response.setContentType(contentType);
response.setHeader("Content-Range", "bytes " + r.start + "-" + r.end + "/" + r.total);
response.setHeader("Content-Length", String.valueOf(r.length));
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); // 206.
// Copy single part range.
Range.copy(input, output, length, r.start, r.length);
} else {
// Return multiple parts of file.
response.setContentType("multipart/byteranges; boundary=" + MULTIPART_BOUNDARY);
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); // 206.
// Cast back to ServletOutputStream to get the easy println methods.
ServletOutputStream sos = (ServletOutputStream) output;
// Copy multi part range.
for (Range r : ranges) {
logger.info("Return multi part of file : from ({}) to ({})", r.start, r.end);
// Add multipart boundary and header fields for every range.
sos.println();
sos.println("--" + MULTIPART_BOUNDARY);
sos.println("Content-Type: " + contentType);
sos.println("Content-Range: bytes " + r.start + "-" + r.end + "/" + r.total);
// Copy single part range of multi part range.
Range.copy(input, output, length, r.start, r.length);
}
// End with multipart boundary.
sos.println();
sos.println("--" + MULTIPART_BOUNDARY + "--");
}
}
}
private static class Range {
long start;
long end;
long length;
long total;
/**
* Construct a byte range.
* @param start Start of the byte range.
* @param end End of the byte range.
* @param total Total length of the byte source.
*/
public Range(long start, long end, long total) {
this.start = start;
this.end = end;
this.length = end - start + 1;
this.total = total;
}
public static long sublong(String value, int beginIndex, int endIndex) {
String substring = value.substring(beginIndex, endIndex);
return (substring.length() > 0) ? Long.parseLong(substring) : -1;
}
private static void copy(RandomAccessFile input, OutputStream output, long inputSize, long start, long length) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int read;
if (inputSize == length) {
// Write full range.
while ((read = input.read(buffer)) > 0) {
output.write(buffer, 0, read);
output.flush();
}
} else {
input.seek(start);
long toRead = length;
while ((read = input.read(buffer)) > 0) {
if ((toRead -= read) > 0) {
output.write(buffer, 0, read);
output.flush();
} else {
output.write(buffer, 0, (int) toRead + read);
output.flush();
break;
}
}
}
}
}
private static class HttpUtils {
/**
* Returns true if the given accept header accepts the given value.
* @param acceptHeader The accept header.
* @param toAccept The value to be accepted.
* @return True if the given accept header accepts the given value.
*/
public static boolean accepts(String acceptHeader, String toAccept) {
String[] acceptValues = acceptHeader.split("\s*(,|;)\s*");
Arrays.sort(acceptValues);
return Arrays.binarySearch(acceptValues, toAccept) > -1
|| Arrays.binarySearch(acceptValues, toAccept.replaceAll("/.*$", "/*")) > -1
|| Arrays.binarySearch(acceptValues, "*/*") > -1;
}
/**
* Returns true if the given match header matches the given value.
* @param matchHeader The match header.
* @param toMatch The value to be matched.
* @return True if the given match header matches the given value.
*/
public static boolean matches(String matchHeader, String toMatch) {
String[] matchValues = matchHeader.split("\s*,\s*");
Arrays.sort(matchValues);
return Arrays.binarySearch(matchValues, toMatch) > -1
|| Arrays.binarySearch(matchValues, "*") > -1;
}
}
}
回答by Fadeef Saleh
woww, The answer of Leandro so briliant. just create service file follow him and use in controller. here my after follow his guidelines
哇，莱安德罗的回答太棒了。只需创建服务文件跟随他并在控制器中使用。在这里我遵循他的指导方针
@RequestMapping(value = [(SKConstant.URL_PROJECT_API + "/video/{token}")], method = arrayOf(RequestMethod.GET)
fun getVideo(@PathVariable("token") token: String, response: HttpServletResponse, request: HttpServletRequest): Any?{
val file = baseService.getByToken(token)
if(file != null) {
return MultipartFileSender.fromFile(File(fileService.getUploadFileRealPath(file.uniqueName!!)))
.with(request)
.with(response)
.serveResource()
}
