如何解决如何在浏览器组件中访问FileSystemStorage中的文件
我正在尝试在浏览器组件中显示保存在FileSystemStorage中的pdf，但是它在控制台[0813/072549.347989:INFO:CONSOLE(37)] "Not allowed to load local resource: file://home//Chapter_11.pdf#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0&view=FitH",source: https://cn1app/streams/1 (37) [0813/072551.123557:INFO:CONSOLE(0)] "Not allowed to load local resource: file://home//Chapter_11.pdf#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0&view=FitH",source: https://cn1app/streams/1 (0) 上一直给我这个错误。就像我需要解决一个限制。我该如何解决？
编辑...在下面添加了信息。
这是我正在使用的代码：
Form hi;
Container loadingMsg;
public void Home(){
Form form = new Form("Display pdf",new BorderLayout());
Button showPdf = new Button("Show Pdf");
showPdf.addActionListener(l->{
show();
});
form.add(BorderLayout.CENTER,showPdf);
form.show();
}
private void show(){
hi = new Form("PDF Viewer",new BorderLayout());
Label loadingLabel = new Label("Loading PDF...");
loadingMsg = FlowLayout.encloseCenter(loadingLabel);
hi.add(BorderLayout.NORTH,loadingMsg);
String pdfUrl = "https://as.vanderbilt.edu/chemistry/Rizzo/chem220a/Chapter_11.pdf";
String fileName = FileSystemStorage.getInstance().getAppHomePath() + "Chapter_11";
if (!FileSystemStorage.getInstance().exists(fileName)) {
Util.downloadUrlToFileSystemInBackground(pdfUrl,fileName);
};
hi.addShowListener(l -> {
run1(fileName);
});
hi.show();
}
private void run1(String fileName) {
BrowserComponent browser = new BrowserComponent();
browser.setPage(getPdfViewerHtml(fileName),null);
hi.add(BorderLayout.CENTER,browser);
loadingMsg.remove();
hi.revalidate();
}
private String getPdfViewerHtml(String fileName) {
String html = "<!DOCTYPE html>\n"
+ "<html>\n"
+ " <head>\n"
+ " <title>PDF Viewer</title>\n"
+ " <style>\n"
+ " html{\n"
+ " height: 100%;\n"
+ " padding: 0;\n"
+ " }\n"
+ " body{\n"
+ " height: 100%;\n"
+ " overflow-y: hidden;\n"
+ " position: fixed;\n"
+ " width: 100%;\n"
+ " padding: 0;\n"
+ " margin: 0;\n"
+ " }\n"
+ " </style>\n"
+ " </head>\n"
+ " <body>\n"
+ "\n"
+ " <div style= \"height: 100%; margin: 0;\">\n"
+ " <iframe\n"
+ " src='"+fileName+"#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0&view=FitH'\n"
+ " width=\"100%\"\n"
+ " height=\"100%\"\n"
+ " >\n"
+ " <p>This browser does not support PDF!</p>\n"
+ " </iframe>\n"
+ "\n"
+ " </div>\n"
+ "\n"
+ " </body>\n"
+ "</html>";
return html;
}
因此，在方法String getPdfViewerHtml(String fileName)中，当我用网址替换fileName时，一切正常。但是我希望它显示FileSystemStorage中的文件。
解决方法
以下代码应正确支持本地embed标签：
private Container loadingMsg;
public void start() {
if (current != null) {
current.show();
return;
}
home();
}
public void home() {
Form form = new Form("Display pdf",new BorderLayout());
Button showPdf = new Button("Show Pdf");
showPdf.addActionListener(l -> {
showPdf.setText("Dowloading PDF...");
showPdf.setEnabled(false);
form.revalidate();
show();
});
form.add(BorderLayout.CENTER,showPdf);
form.show();
}
private void show() {
String root = getAppHomePath() + "httpdocs/";
mkdir(root);
hi = new Form("PDF Viewer",new BorderLayout());
Label loadingLabel = new Label("Loading PDF...");
loadingMsg = FlowLayout.encloseCenter(loadingLabel);
hi.add(BorderLayout.NORTH,loadingMsg);
String pdfUrl = "https://as.vanderbilt.edu/chemistry/Rizzo/chem220a/Chapter_11.pdf";
String fileName = root + "/Chapter_11.pdf";
if (!FileSystemStorage.getInstance().exists(fileName)) {
Util.downloadUrlToFile(pdfUrl,fileName,false);
try {
run1(docRoot,"Chapter_11.pdf");
} catch (IOException ex) {
Log.e(ex);
}
} else {
try {
run1(docRoot,fileName);
} catch (IOException ex) {
Log.e(ex);
}
}
hi.show();
}
private void run1(String docRoot,String fileName) throws IOException {
BrowserComponent browser = new BrowserComponent();
String localUrl = fileName;
String htmlPage = getPdfViewerHtml(localUrl);
File indexHtml = new File(docRoot,"index.html");
writeStringToFile(indexHtml,htmlPage);
browser.setURL(docRoot + "/index.html");
hi.add(BorderLayout.CENTER,browser);
loadingMsg.remove();
hi.revalidate();
}
private String getPdfViewerHtml(String fileName) {
String html = "<!DOCTYPE html>\n"
+ "<html>\n"
+ " <head>\n"
+ " <title>PDF Viewer</title>\n"
+ " <style>\n"
+ " html{\n"
+ " height: 100%;\n"
+ " padding: 0;\n"
+ " }\n"
+ " body{\n"
+ " height: 100%;\n"
+ " overflow-y: hidden;\n"
+ " position: fixed;\n"
+ " width: 100%;\n"
+ " padding: 0;\n"
+ " margin: 0;\n"
+ " }\n"
+ " </style>\n"
+ " </head>\n"
+ " <body>\n"
+ "\n"
+ " <div style= \"height: 100%; margin: 0;\">\n"
+ " <iframe\n"
+ " src='" + fileName + "#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0&view=FitH'\n"
+ " width=\"100%\"\n"
+ " height=\"100%\"\n"
+ " >\n"
+ " <p>This browser does not support PDF!</p>\n"
+ " </iframe>\n"
+ "\n"
+ " </div>\n"
+ "\n"
+ " </body>\n"
+ "</html>";
return html;
}
private void writeStringToFile(File file,String content) throws IOException {
FileSystemStorage fs = FileSystemStorage.getInstance();
try (OutputStream os = fs.openOutputStream(file.getAbsolutePath())) {
Util.copy(new ByteArrayInputStream(content.getBytes("UTF-8")),os);
}
}
}
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