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增加一个Spring分段下载示例 #216

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增加一个Spring分段下载示例 #216

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832e3f6
添加@Override
MagakiReimu Apr 30, 2020
632fa01
优化代码
MagakiReimu Apr 30, 2020
2d8b7d4
分段下载代码示例
MagakiReimu Apr 30, 2020
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26 changes: 9 additions & 17 deletions src/main/java/com/github/tobato/fastdfs/domain/conn/DefaultConnection.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,8 @@

import com.github.tobato.fastdfs.domain.proto.CmdConstants;
import com.github.tobato.fastdfs.domain.proto.OtherConstants;
import com.github.tobato.fastdfs.domain.proto.mapper.BytesUtil;
import com.github.tobato.fastdfs.domain.proto.ProtoHead;
import com.github.tobato.fastdfs.domain.proto.StatusConstants;
import com.github.tobato.fastdfs.exception.FdfsConnectException;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
Expand All @@ -14,7 +15,6 @@
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.charset.Charset;
import java.util.Arrays;

/**
* 默认连接实现
Expand Down Expand Up @@ -60,16 +60,11 @@ public DefaultConnection(InetSocketAddress address, int soTimeout, int connectTi
/**
* 正常关闭连接
*/
@Override
public synchronized void close() {
LOGGER.debug("disconnect from {}", socket);
byte[] header = new byte[OtherConstants.FDFS_PROTO_PKG_LEN_SIZE + 2];
Arrays.fill(header, (byte) 0);

byte[] hex_len = BytesUtil.long2buff(0);
System.arraycopy(hex_len, 0, header, 0, hex_len.length);
header[OtherConstants.PROTO_HEADER_CMD_INDEX] = CmdConstants.FDFS_PROTO_CMD_QUIT;
header[OtherConstants.PROTO_HEADER_STATUS_INDEX] = (byte) 0;
try {
byte[] header = new ProtoHead(CmdConstants.FDFS_PROTO_CMD_QUIT).toByte();
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socket.getOutputStream().write(header);
socket.close();
} catch (IOException e) {
Expand All @@ -95,19 +90,13 @@ public boolean isClosed() {
public boolean isValid() {
LOGGER.debug("check connection status of {} ", this);
try {
byte[] header = new byte[OtherConstants.FDFS_PROTO_PKG_LEN_SIZE + 2];
Arrays.fill(header, (byte) 0);

byte[] hex_len = BytesUtil.long2buff(0);
System.arraycopy(hex_len, 0, header, 0, hex_len.length);
header[OtherConstants.PROTO_HEADER_CMD_INDEX] = CmdConstants.FDFS_PROTO_CMD_ACTIVE_TEST;
header[OtherConstants.PROTO_HEADER_STATUS_INDEX] = (byte) 0;
byte[] header = new ProtoHead(CmdConstants.FDFS_PROTO_CMD_ACTIVE_TEST).toByte();
socket.getOutputStream().write(header);
if (socket.getInputStream().read(header) != header.length) {
return false;
}

return header[OtherConstants.PROTO_HEADER_STATUS_INDEX] == 0 ? true : false;
return header[OtherConstants.PROTO_HEADER_STATUS_INDEX] == StatusConstants.FDFS_STORAGE_STATUS_INIT;
} catch (IOException e) {
LOGGER.error("valid connection error", e);
return false;
Expand All @@ -120,6 +109,7 @@ public boolean isValid() {
* @return
* @throws IOException
*/
@Override
public OutputStream getOutputStream() throws IOException {
return socket.getOutputStream();
}
Expand All @@ -130,6 +120,7 @@ public OutputStream getOutputStream() throws IOException {
* @return
* @throws IOException
*/
@Override
public InputStream getInputStream() throws IOException {
return socket.getInputStream();
}
Expand All @@ -139,6 +130,7 @@ public InputStream getInputStream() throws IOException {
*
* @return
*/
@Override
public Charset getCharset() {
return charset;
}
Expand Down
100 changes: 100 additions & 0 deletions src/test/java/com/github/tobato/fastdfs/controller/FileDownloadDemoController.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,100 @@
package com.github.tobato.fastdfs.controller;

import com.github.tobato.fastdfs.service.DefaultGenerateStorageClient;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.util.List;

/**
* @author MagakiReimu
* @version 1.0
*/
@RestController
@RequestMapping("/download")
public class FileDownloadDemoController {

@Autowired
private DefaultGenerateStorageClient defaultGenerateStorageClient;

@GetMapping("/demo")
public void downloadDemo(@RequestHeader(value = HttpHeaders.RANGE, required = false) String rangeHeader,
HttpServletResponse response) {
// 以下数据，请从自己的开发系统中获取
String fileName = "abc.txt";
String group = "group1";
String path = "xxxxx";
long fileSize = 0L;

// 分段下载计算参数
long rangeStart = 0L;
long rangeEnd = 0L;
long downloadSize = 0L;
long contentLength = fileSize;

// 获取分段下载请求
List<HttpRange> httpRangeList = HttpRange.parseRanges(rangeHeader);
if (httpRangeList.size() == 0) {
// 无分段下载请求，下载为全量下载
// 调用downloadFile下载整个文件, 调用接口为只有group, path参数时
// 下载接口统一, 保持二次调用中rangeStart, downloadSize为0
// 普通下载状态码200
response.setStatus(HttpStatus.OK.value());
} else if (httpRangeList.size() == 1) {
// 分段下载只解析第一个，一般请求只包含一个
HttpRange httpRange = httpRangeList.get(0);
// 请求起始字节
rangeStart = httpRange.getRangeStart(fileSize);
// 请求结束字节
rangeEnd = httpRange.getRangeEnd(fileSize);
// 请求分段长度
contentLength = rangeEnd - rangeStart + 1L;
// 请求下载长度
downloadSize = contentLength;
// Content-Range: bytes [unit first byte pos] - [last byte pos] / [entity length]
String contentRange = String.format("bytes %d-%d/%d", rangeStart, rangeEnd, fileSize);
response.addHeader(HttpHeaders.CONTENT_RANGE, contentRange);
// 分段下载状态码206
response.setStatus(HttpStatus.PARTIAL_CONTENT.value());
} else {
// 协议支持一个请求包含多段下载, Demo不做多段解析
response.setStatus(HttpStatus.BAD_REQUEST.value());
return;
}

// Content-Type
// 方式一：写死Content-Type
MediaType contentType = MediaType.APPLICATION_OCTET_STREAM;
// 方式二：根据文件名猜测Content-Type
contentType = MediaType.parseMediaType(URLConnection.guessContentTypeFromName(fileName));
response.setContentType(contentType.toString());
// Content-Disposition
//@formatter:off
ContentDisposition contentDisposition = ContentDisposition
.builder("form-data")
.name("attachment")
.filename(fileName, StandardCharsets.UTF_8)
.build();
//@formatter:on
response.addHeader(HttpHeaders.CONTENT_DISPOSITION, contentDisposition.toString());
// 本次下载大小
response.setContentLengthLong(contentLength);
// 支持分段下载
response.addHeader(HttpHeaders.ACCEPT_RANGES, "bytes");

// 根据上方计算值，下载区间数据
defaultGenerateStorageClient.downloadFile(group, path, rangeStart, downloadSize,
inputStream -> {
IOUtils.copy(inputStream, response.getOutputStream());
return null;
});
}
}