init

src/net/droidtech/io/DroidFile.java

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+package net.droidtech.io;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+
+public class DroidFile extends File{
+
+	private static final long serialVersionUID = 7311643678032690177L;
+	private File file=null;
+	
+	public DroidFile(String path){
+		super(path);
+		file=new File(path);
+	}
+	public DataInputStream getInputStream(){
+		try {
+			if(file.exists()&&!file.isDirectory()){
+			    DataInputStream in=new DataInputStream(new FileInputStream(file));
+			    return in;
+			}else{
+				return null;
+			}
+		} catch (Exception e) {
+			// TODO Auto-generated catch block
+			return null;
+		}
+		
+	}
+	
+	public DataOutputStream getOutputStream(){
+		try {
+			if(file.exists()&&!file.isDirectory()){
+			    DataOutputStream out=new DataOutputStream(new FileOutputStream(file));
+			    return out;
+			}else{
+				return null;
+			}
+		} catch (Exception e) {
+			// TODO Auto-generated catch block
+			return null;
+		}
+	}
+	
+	public void copyTo(File target){
+		DroidFile file=new DroidFile(target.getAbsolutePath());
+		if(file.createNewFile()){
+		    StreamWriter writer=new StreamWriter();
+		    writer.writeStream(this.getInputStream(),file);
+		}
+	}
+	
+	@Override
+	public boolean createNewFile(){
+		try {
+			File parentDir=new File(file.getParent());
+			if(!parentDir.exists()){
+				parentDir.mkdirs();
+			}
+			file.createNewFile();
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			return false;
+		}
+		return file.exists();
+	}
+	
+	@Override
+	public boolean mkdir(){
+		file.mkdirs();
+		return file.exists();
+	}
+	
+	public String getMD5String(){
+		byte[] md5data=getMD5Bytes();
+		if(md5data!=null){
+			return new BigInteger(1,md5data).toString(16);
+		}else{
+			return null;
+		}
+	}
+	
+	public byte[] getMD5Bytes(){
+		DataInputStream in=this.getInputStream();
+		if(in==null){
+			return null;
+		}
+		try {
+			byte[] buffer=new byte[4096];
+			MessageDigest md5=MessageDigest.getInstance("MD5");
+			while(true){
+				int count=in.read(buffer);
+				if(count!=-1){
+				md5.update(buffer,0,count);
+				}else{
+					in.close();
+					break;
+			}
+		}
+			return md5.digest();
+		} catch (Exception e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+			return null;
+		}
+	}
+	
+	public DroidFile getChildFile(String name){
+		if(!this.isDirectory()){
+			return null;
+		}
+		return new DroidFile(this.getAbsolutePath()+File.separator+name);
+	}
+}