HttpURLConnection 下载

1.

package com.example.xxxxxx;


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.LinkedHashMap;
import java.util.Map;


import android.util.Log;


public class T extends Thread {
private String downUrl;
private int fileSize;
private HttpURLConnection http;
private boolean isCancel;


private InputStream is;
private FileOutputStream os;


public boolean isCancel() {
return isCancel;
}


public void setCancel(boolean isCancel) {
this.isCancel = isCancel;
}


public T(String downUrl) {
this.downUrl = downUrl;
}


public void setCancel() {
this.isCancel = true;
if (http != null) {
try {
if (is != null) {
is.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
}
http.disconnect();
http = null;
}
Log.i("zdy", "isCancel");
}


public void run() {
try {
URL imageUrl = new URL(downUrl);


http = (HttpURLConnection) imageUrl.openConnection();
http.setConnectTimeout(5 * 1000);
http.setRequestMethod("GET");
http.setRequestProperty(
"Accept",
"image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
http.setRequestProperty("Accept-Language", "zh-CN");
http.setRequestProperty("Charset", "UTF-8");


http.setRequestProperty(
"User-Agent",
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
http.setRequestProperty("Connection", "Keep-Alive");
http.connect();
Log.i("zdy", "---" + System.currentTimeMillis());


if (http.getResponseCode() == 200) {
this.fileSize = http.getContentLength();// 根据响应获取文件大小
Log.i("zdy", "---" + System.currentTimeMillis());
if (fileSize <= 0) {
Log.i("zdy", "--->" + "文件大小错误");
} else {
is = http.getInputStream();
os = new FileOutputStream(new File(
MainActivity.LOCAL_APK_PATH, "zdy.jpg"));
// Utils.CopyStream(is, os);
final int buffer_size = 1024;


byte[] bytes = new byte[buffer_size];
int offset = 0;
int count = 0;


while (!isCancel
&& (offset = is.read(bytes, 0, buffer_size)) != -1) {
os.write(bytes, 0, offset);
Log.i("zdy", "--->" + "下载中。。。。");
count += offset;
}
if (count == fileSize) {
Log.i("zdy", "完成");
}
Log.i("zdy", "线程结束");
}


} else {


}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i("zdy", "url 格式错误");
} catch (Exception e) {
Log.i("zdy", "网络连接失败");
if (isCancel == true) {
Log.i("zdy", "无网络连接+手动取消");
}
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
is = null;
} catch (IOException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
}
}
if (os != null) {
try {
os.close();
os = null;
} catch (IOException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
}
}
if (http != null) {
http.disconnect();
}
if (isCancel == true) {
Log.i("zdy", "下载取消");
}


}
}


/**
* 打印Http头字段
* 
* @param http
*/
public void printResponseHeader(HttpURLConnection http) {
Map<String, String> header = getHttpResponseHeader(http);
for (Map.Entry<String, String> entry : header.entrySet()) {
String key = entry.getKey() != null ? entry.getKey() + ":" : "";
print(key + entry.getValue());
}
}


private void print(String msg) {
Log.i("zdy", "msg-》" + msg);


}


/**
* 获取Http响应头字段
* 
* @param http
* @return
*/
public Map<String, String> getHttpResponseHeader(HttpURLConnection http) {
Map<String, String> header = new LinkedHashMap<String, String>();
for (int i = 0;; i++) {
String mine = http.getHeaderField(i);
if (mine == null)
break;
header.put(http.getHeaderFieldKey(i), mine);
}
return header;
}


}
// }

package com.example.xxxxxx;


import java.io.File;


import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.View;


public class MainActivity extends Activity {
public static final String LOCAL_APK_PATH = Environment
.getExternalStorageDirectory() + "/zdy";
private String url = "http://www.ubtrobot.com/tools/alpha1robot/android/Alpha1Blooth(1.2.0.3).zip";
private T t;
private int index;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
File saveDir = new File(LOCAL_APK_PATH);// Environment.getExternalStorageDirectory();
if (!saveDir.exists()) {
saveDir.mkdirs();
}

t = new T(url);


}


public void onTest(View view) {
if (index == 0) {
if (t == null) {
t = new T(url);
}
t.start();
index++;
} else {
t.setCancel();
t = null;
index = 0;
}
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}


}