我正在尝试使用jsch通过rest api下载文件。我试图在unix框中读取文件并将其写入文件并下载文件。当我使用下面的代码时，文件的内容没有完整写入。我正在尝试读取一个大文件，但文件没有被完全读取。
@GET
@Path("/pdf")
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response readFile() {
StreamingOutput fileStream = new StreamingOutput()
{
@Override
public void write(java.io.OutputStream output) throws IOException, WebApplicationException
{ Session session=null;
JSch jsch=new JSch();
try {
session = jsch.getSession("username", "ipAddress", 22);
session.setPassword("password");;
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
final ChannelExec channel = (ChannelExec) session.openChannel("exec");
channel.setCommand("cd /path/; cat filename");
channel.setInputStream(null);
channel.setErrStream(System.err);
final InputStream input = channel.getInputStream();
InputStream error = channel.getErrStream();
channel.connect();
Thread.sleep(30000);
byte[] tmp = new byte[100000];
while (true) {
if (input.available() > 0) {
int i = input.read(tmp, 0, 100000);
if (i < 0)
break;
final StringBuilder temp = new StringBuilder();
temp.append((new String(tmp, 0, i)));
File file=new File("D://mylog.log");
FileOutputStream oS = new FileOutputStream(new File("D://mylog.log"));
oS.write(temp.toString().getBytes());
java.nio.file.Path path = Paths.get("D://mylog.log");
byte[] data = Files.readAllBytes(path);
output.write(data);
output.flush();
break;
}
}}
catch (Exception e) {
e.printStackTrace();
} finally {
}
}
};
return Response
.ok(fileStream, MediaType.APPLICATION_OCTET_STREAM)
.header("content-disposition","attachment; filename = myfile.log")
.build();
}