Java 浏览按钮选择目录
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Browse button to select directory
提问by pise
I want to create a browse button in my web page to select directory and not file. I know that input type file won't work here but is there any way to do it with Javascript. I want to get the filepath of client machine which is possible in IE but other browser are not supporting but that is fine for me.
我想在我的网页中创建一个浏览按钮来选择目录而不是文件。我知道输入类型文件在这里不起作用，但是有什么方法可以用 Javascript 来做到这一点。我想获取客户端机器的文件路径，这在 IE 中是可能的，但其他浏览器不支持，但这对我来说很好。
The way I got stuck is how to get file directory in button.
我卡住的方式是如何在按钮中获取文件目录。
Below is the code I am using to call applet from browser but I am getting Detected from bootclasspath: C:\PROGRA~1\Java\jre7\lib\deploy.jar error in browser. I have compiled class file using Java 1.5
下面是我用来从浏览器调用小程序的代码，但我从引导类路径中检测到：C:\PROGRA~1\Java\jre7\lib\deploy.jar 在浏览器中出错。我已经使用 Java 1.5 编译了类文件
<applet code="com.life.draw.BrowsePage.class"></applet>
Code
代码
public class BrowsePage extends JApplet {
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle("Browse the folder to process");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
System.out.println("getCurrentDirectory(): "+ chooser.getCurrentDirectory());
System.out.println("getSelectedFile() : "+ chooser.getSelectedFile());
} else {
System.out.println("No Selection ");
}
}
}
采纳答案by MadProgrammer
Why the hell are you calling this in the your paintmethod? This is likely trying creating to create new windows EVERY TIME the applet is painted.
你到底为什么在你的paint方法中调用它？这可能是每次小程序出现时都试图创建新窗口painted。
public void paint(Graphics g) {
// TODO Auto-generated method stub
JFileChooser chooser = new JFileChooser();
/*...*/
Instead, create a JButtonin your initmethod and attach an ActionListenerto it...
相反，JButton在您的init方法中创建一个并将其附加ActionListener到...
public void init() {
setLayout(new GridBagLayout());
JButton browse = new JButton("...");
browse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle("Browse the folder to process");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
System.out.println("getCurrentDirectory(): "+ chooser.getCurrentDirectory());
System.out.println("getSelectedFile() : "+ chooser.getSelectedFile());
} else {
System.out.println("No Selection ");
}
}
});
add(browse);
}
You might also like to take a look at What Applets Can and Cannot Do
您可能还想看看小程序可以做什么和不能做什么
回答by Spikeh
The only way you can get a local browse dialogue in a web browser is either by using <input type="file"/>, or by using a Java Applet or Adobe Flash plugin. There is no built in way to get a directory reference from JS in a web browser.
在 Web 浏览器中获得本地浏览对话的唯一方法是使用<input type="file"/>，或者使用 Java Applet 或 Adobe Flash 插件。没有内置的方法可以在 Web 浏览器中从 JS 获取目录引用。
Also, you cannot read the contents of a client's hard disk, or even initiate a browse dialogue via JavaScript. If you were able to, it would impose considerable security issues.
此外，您无法读取客户端硬盘的内容，甚至无法通过 JavaScript 启动浏览对话。如果您能够这样做，它将带来相当大的安全问题。
In reference to reading a directory, take a look at the following posts:
关于阅读目录，请查看以下帖子：
Local file access with javascript
Getting content of a local file without uploading
Javascript: Getting the contents of a local server-side file
By the sound of it, you're going to need to write a flash plugin that lets you select a directory locally. Your users will be given a security warning when downloading the plugin, though.
听上去，您将需要编写一个 Flash 插件，让您可以在本地选择一个目录。不过，您的用户在下载插件时会收到安全警告。
Edit:
编辑：
There's also the webkit based method, but this will only work in webkit based browsers (Chrome, Safari etc).
还有基于 webkit 的方法，但这仅适用于基于 webkit 的浏览器（Chrome、Safari 等）。
How do I use Google Chrome 11's Upload Folder feature in my own code?
