/*
* 准备缓冲环，并跳过开始标记
*/
MarkMode mm;
BufferRing br;
try {
ServletInputStream ins = req.getInputStream();
// 构建 3 个环节点的缓冲环
br = new BufferRing(ins, 3, bufferSize);
// 初始加载
info.current = br.load();
// 跳过开始的标记
mm = br.mark(firstBoundaryBytes);
// 这是不可能的，应该立即退出
if (mm != MarkMode.FOUND) {
if (log.isWarnEnabled())
log.warnf("Fail to find the firstBoundary (%s) in stream, quit!", firstBoundary);
return params;
}
br.skipMark();
if (log.isDebugEnabled())
log.debug("skip first boundary");
}
catch (IOException e) {
throw Lang.wrapThrow(e);
}
/**
* ========================================================<br>
* 进入循环
*/
if (log.isDebugEnabled())
log.debug("Reading...");
try {
FieldMeta meta;
do {
info.current = br.load();
// 标记项目头
mm = br.mark(nameEndlBytes);
String s = br.dumpAsString(charset);
// 肯定碰到了 "--\r\n"， 这标志着整个流结束了
if ("--".equals(s) || MarkMode.STREAM_END == mm) {
break;
}
// 找到头的结束标志
else if (MarkMode.FOUND == mm) {
meta = new FieldMeta(s);
}
// 这是不可能的，抛错
else {
throw new UploadInvalidFormatException("Fail to found nameEnd!");
}
if(log.isDebugEnabled())
log.debugf("Upload File info: FilePath=[%s],fieldName=[%s]",meta.getFileLocalPath(),meta.getName());
// 作为文件读取
if (meta.isFile()) {
if (log.isDebugEnabled())
log.debugf("Upload Info: name=%s,content_type=%s", meta.getFileLocalName(),meta.getContentType());
// 检查是否通过文件名过滤
if (!context.isNameAccepted(meta.getFileLocalName())) {
throw new UploadUnsupportedFileNameException(meta);
}
// 检查是否通过文件类型过滤
if (!context.isContentTypeAccepted(meta.getContentType())) {
throw new UploadUnsupportedFileTypeException(meta);
}
// 上传的是一个空文件
if ("\"\"".equals(meta.getName()) || Strings.isBlank(meta.getFileLocalPath())) {
do {
info.current = br.load();
mm = br.mark(itemEndlBytes);
assertStreamNotEnd(mm);
br.skipMark();
} while (mm == MarkMode.NOT_FOUND);
}
// 保存临时文件
else {
File tmp = tmps.createFile(meta.getFileExtension());
OutputStream ops = null;
try {
ops = new BufferedOutputStream( new FileOutputStream(tmp),
bufferSize * 2);
// 需要限制文件大小
if (maxFileSize > 0) {
long maxPos = info.current + maxFileSize;
do {
info.current = br.load();
mm = br.mark(itemEndlBytes);
assertStreamNotEnd(mm);
if (info.current > maxPos) {
throw new UploadOutOfSizeException(meta);
}
br.dump(ops);
if(info.stop)
throw new UploadStopException(info);
} while (mm == MarkMode.NOT_FOUND);
}
// 不限制文件大小
else {
do {
info.current = br.load();
mm = br.mark(itemEndlBytes);
assertStreamNotEnd(mm);
br.dump(ops);
if(info.stop)
throw new UploadStopException(info);
} while (mm == MarkMode.NOT_FOUND);
}
}
finally {
Streams.safeFlush(ops);
Streams.safeClose(ops);
}
// 如果是空文件，不保存
if (context.isIgnoreNull() && tmp.length() == 0) {}
// 默认，空文件也保存
else {
params.addv(meta.getName(), new TempFile(meta, tmp));
}
}
}
// 作为提交值读取
else {
StringBuilder sb = new StringBuilder();
do {
info.current = br.load();
mm = br.mark(itemEndlBytes);
assertStreamNotEnd(mm);
sb.append(br.dumpAsString(charset));
} while (mm == MarkMode.NOT_FOUND);
params.addv(meta.getName(), sb.toString());
if (log.isDebugEnabled())
log.debugf( "Found a param, name=[%s] value=[%s]",
meta.getName(),
sb.toString());
}
} while (mm != MarkMode.STREAM_END);
}
// 处理异常
catch (IOException e) {
throw Lang.wrapThrow(e, UploadException.class);
}
// 安全关闭输入流
finally {
br.close();
}
if (log.isDebugEnabled())
log.debugf("...Done %s bytes readed", br.readed());
/**
* 全部结束<br>
* ========================================================
*/