Question

使用 java 编程，获取网路上的pdf文件

我想编写个程序，知道这个pdf文件的下载的链接地址，直接使用程序将其下载，保存在本地；如果有别的自动下载的方式也可以啊

Answer 1

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.widget.Toast;

public class MyService2 extends Service {

Thread thread = new Thread() {

@Override
public void run() {
try {
// 声明抛出所有例外
URL tirc = new URL("http://www.baidu.com/img/baidu_sylogo1.gif");
// 构建一URL对象
InputStream is = tirc.openStream();

FileOutputStream fos = new FileOutputStream(
"/mnt/sdcard/baidu_sylogo21.gif");

byte[] buffer = new byte[1024];
int len = is.read(buffer);

while (len != -1) {

fos.write(buffer, 0, len);
len = is.read(buffer);
}

fos.close();
is.close();
handler.sendEmptyMessage(1);

} catch (Exception e) {
e.printStackTrace();
}
}

};

Handler handler = new Handler() {

@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
Toast.makeText(MyService2.this, "下载完成...", Toast.LENGTH_LONG)
.show();
break;
}
}

};

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Toast.makeText(this, "Service onStart...", Toast.LENGTH_LONG).show();

thread.start();
}

@Override
public void onCreate() {
super.onCreate();
Toast.makeText(this, "Service created...", Toast.LENGTH_LONG).show();
}

@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service destroyed...", Toast.LENGTH_LONG).show();
}

}
把链接地址改了就可以了