在我们的移动应用程序(cordova + html4)中,我们需要显示流中的PDF。我们有一项返回pdf流的服务。我们想将该流存储到手机的临时文件夹位置并显示PDF。
下面的示例Java示例Java代码可以执行我所需的确切操作。但是如何在Java脚本上实现此功能?我的意思是在Java脚本中读取二进制流。
String fileURL = "https://1/////4/xyz";
String saveDir = "D:/Works";
try {
URL url = new URL(fileURL);
HttpURLConnection httpConn = (HttpURLConnection) url
.openConnection();
httpConn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
httpConn.setRequestProperty("TOKEN",
"ghZtxnPfpJ63FgdT/59V+5zFTKHRdwm6rIfGJC+0B5W5CJ9pG33od7l+/L6S8R56");
int responseCode = httpConn.getResponseCode();
System.out.println("Reseponse Code = " + responseCode);
if (responseCode == HttpURLConnection.HTTP_OK) {
String fileName = "";
String disposition = httpConn
.getHeaderField("Content-Disposition");
String contentType = httpConn.getContentType();
int contentLength = httpConn.getContentLength();
if (disposition != null) {
// extracts file name from header field
int index = disposition.indexOf("filename=");
if (index > 0) {
fileName = disposition.substring(index + 10,
disposition.length() - 1);
}
} else {
// extracts file name from URL
fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1,
fileURL.length());
}
System.out.println("Content-Type = " + contentType);
System.out.println("Content-Disposition = " + disposition);
System.out.println("Content-Length = " + contentLength);
System.out.println("fileName = " + fileName);
// opens input stream from the HTTP connection
InputStream inputStream = httpConn.getInputStream();
String saveFilePath = saveDir + File.separator + fileName;
// opens an output stream to save into file
FileOutputStream outputStream = new FileOutputStream(
saveFilePath);
int bytesRead = -1;
byte[] buffer = new byte[BUFFER_SIZE];
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.close();
inputStream.close();
System.out.println("File downloaded");
} else {
System.out
.println("No file to download. Server replied HTTP code: "
+ responseCode);
}
httpConn.disconnect();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
最佳答案
您可能需要看一下Thre的两个库:
jsPDF如果您尝试从javascript和
pdf.js(如果您正在尝试在界面中实现pdf查看器)。
这两个中的一个应该为您解决问题。
关于javascript - 从javascript/cordova编写pdf,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/27923561/