让文件对话框真正支持Windows快捷方式代码,Java代码库,德仔网

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【Java】让文件对话框真正支持Windows快捷方式
作者:DDT / 发布于2012/6/25/ 703
让文件对话框真正支持Windows快捷方式
<div>public class LnkParser {
public LnkParser(File f) throws Exception {
parse(f);
}
public void parse(File f) throws Exception {
// read the entire file into a byte buffer
FileInputStream fin = new FileInputStream(f);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] buff = new byte[256];
while(true) {
int n = fin.read(buff);
if(n == -1) { break; }
bout.write(buff,0,n);
}
fin.close();
byte[] link = bout.toByteArray();</div>
<div>// get the flags byte
byte flags = link[0x14];</div>
<div>// get the file attributes byte
final int file_atts_offset = 0x18;
byte fileatts = link[file_atts_offset];
byte is_dir_mask = (byte)0x10;
if((fileatts & is_dir_mask) > 0) {
is_dir = true;
} else {
is_dir = false;
}
<div>// if the shell settings are present, skip them
final int shell_offset = 0x4c;
int shell_len = 0;
if((flags & 0x1) > 0) {
// the plus 2 accounts for the length marker itself
shell_len = bytes2short(link,shell_offset) + 2;
}
// get to the file block
int file_start = 0x4c + shell_len;</div>
<div>// get the local volume and local system values
int local_sys_off = link[file_start+0x10] + file_start;
real_file = getNullDelimitedString(link,local_sys_off);
p("real filename = " + real_file);
}
static String getNullDelimitedString(byte[] bytes, int off) {
int len = 0;
// count bytes until the null character (0)
while(true) {
if(bytes[off+len] == 0) {
break;
}
len++;
}
return new String(bytes,off,len);
}
// convert two bytes into a short
// note, this is little-endian because it's for an
// Intel-only OS.
static int bytes2short(byte[] bytes, int off) {
return bytes[off] | (bytes[off+1]<<8);
}
private boolean is_dir;
public boolean isDirectory() {
return is_dir;
}
private String real_file;
public String getRealFilename() {
return real_file;
}
}
public class ShortcutFileSystemView extends FileSystemView {</div>
<div>public Boolean isTraversable(File f) {
if(isDirLink(f)) {
return new Boolean(true);
}
return super.isTraversable(f);
}
public File[] getFiles(File dir, boolean useFileHiding) {
if(isDirLink(dir)) {
dir = getRealFile(dir);
}
return super.getFiles(dir,useFileHiding);
}
private boolean isDirLink(File f) {
try {
if(f.getName().toLowerCase().endsWith(".lnk")) {
if(new LnkParser(f).isDirectory()) {
return true;
}
}
} catch (Exception ex) {
System.out.println("ex: " + ex);
ex.printStackTrace();
}
return false;
}
<div>private File getRealFile(File file) {
try {
return new File(new LnkParser(file).getRealFilename());
} catch (Exception ex) {
System.out.println("ex: " + ex);
ex.printStackTrace();
return null;
}
}
public boolean isDirLink(File f) {
try {
if(f.getName().toLowerCase().endsWith(".lnk")) { 
LnkParser parser = new LnkParser(f); 
if(parser.isDirectory()) {
return true;
}
}
<div>} catch (Exception ex) { 
System.out.println("exception: " + ex.getMessage()); 
ex.printStackTrace();
}
return false;
}
}
public class ShortcutTest {
public static void main(String[] args) throws Exception { 
FileSystemView fsv = new ShortcutFileSystemView(); 
JFileChooser chooser = new JFileChooser(); 
chooser.setFileSystemView(fsv); 
chooser.setFileView(new ShortcutFileView()); 
chooser.showOpenDialog(null);
}
}
</div>
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