我有一个应用程序向GCM注册推送通知.该代码工作正常,不是我的问题的根源.注册后,该应用程序只会在WebView中显示一个网站.到目前为止,如果设备的网络适配器已打开,这一切都很好.
如果关闭网络适配器,则应从缓存加载webview.这部分不起作用.我已经按照下面的教程并从中获取了一些部分,以便将网站页面保存在SD卡上保存的缓存中.
如果我运行该应用程序,则会显示该网站.如果我然后关闭网络适配器并访问该网站,它将不会显示.我检查了SD卡上的缓存目录,并且部分站点已写入缓存.
为什么网站在离线时不会从缓存中加载？
是否可以将网页保留为缓存,直到说应用程序被卸载或android决定否则？
本教程介绍如何在SD卡上创建目录并写入目录.目录确实存在,但在脱机模式下不会从此缓存中恢复webview.
下面是我如何调用显示webview的mainactivity.
Intent i = new Intent(getApplicationContext(),MainActivity.class);
//i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.putExtra("name","hardcoded client name");
i.putExtra("email","hardcoded email");
startActivity(i);
finish();
.
这是完整的MainActivity.您可以忽略第一部分,因为这是处理GCM推送通知内容的代码,一切正常.我需要知道为什么webview不会从缓存中加载.
import static com.bmi.bmitestapp.CommonUtilities.DISPLAY_MESSAGE_ACTION;
import static com.bmi.bmitestapp.CommonUtilities.EXTRA_MESSAGE;
import static com.bmi.bmitestapp.CommonUtilities.SENDER_ID;
import java.io.File;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;
import android.webkit.*;
import com.google.android.gcm.GCMRegistrar;
public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
// label to display gcm messages
TextView lblMessage;
WebView webView;
// Asyntask
AsyncTask<Void,Void,Void> mRegisterTask;
// Alert dialog manager
AlertDialogManager alert = new AlertDialogManager();
// Connection detector
ConnectionDetector cd;
public static String name;
public static String email;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.e(TAG,"in onCreate in mainactivity");
cd = new ConnectionDetector(getApplicationContext());
// Check if Internet present
// if (!cd.isConnectingToInternet()) {
// // Internet Connection is not present
// alert.showAlertDialog(MainActivity.this,// "Internet Connection Error",// "Please connect to working Internet connection",false);
// // stop executing code by return
// return;
// }
// Getting name,email from intent
Intent i = getIntent();
name = i.getStringExtra("name");
email = i.getStringExtra("email");
// Make sure the device has the proper dependencies.
GCMRegistrar.checkDevice(this);
// Make sure the manifest was properly set - comment out this line
// while developing the app,then uncomment it when it's ready.
GCMRegistrar.checkManifest(this);
lblMessage = (TextView) findViewById(R.id.lblMessage);
registerReceiver(mHandleMessageReceiver,new IntentFilter(
DISPLAY_MESSAGE_ACTION));
// Get GCM registration id
final String regId = GCMRegistrar.getRegistrationId(this);
// Check if regid already presents
if (regId.equals("")) {
// Registration is not present,register now with GCM
GCMRegistrar.register(this,SENDER_ID);
} else {
// Device is already registered on GCM
if (GCMRegistrar.isRegisteredOnServer(this)) {
// Skips registration.
Toast.makeText(getApplicationContext(),"Already registered with GCM",Toast.LENGTH_LONG).show();
} else {
// Try to register again,but not in the UI thread.
// It's also necessary to cancel the thread onDestroy(),// hence the use of AsyncTask instead of a raw thread.
final Context context = this;
mRegisterTask = new AsyncTask<Void,Void>() {
@Override
protected Void doInBackground(Void... params) {
// Register on our server
// On server creates a new user
ServerUtilities.register(context,name,email,regId);
return null;
}
@Override
protected void onPostExecute(Void result) {
mRegisterTask = null;
}
};
mRegisterTask.execute(null,null,null);
}
}
webView = (WebView)findViewById(R.id.webView1);
// Initialize the WebView
webView.getSettings().setSupportZoom(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setScrollbarFadingEnabled(true);
webView.getSettings().setLoadsImagesAutomatically(true);
webView.getSettings().setDomStorageEnabled(true);
// Set cache size to 8 mb by default. should be more than enough
webView.getSettings().setAppCacheMaxSize(1024*1024*8);
// This next one is crazy. It's the DEFAULT location for your app's cache
// But it didn't work for me without this line.
// UPDATE: no hardcoded path. Thanks to Kevin Hawkins
String appCachePath = getApplicationContext().getCacheDir().getAbsolutePath();
Log.e(TAG,"appCachePath = " + appCachePath);
webView.getSettings().setAppCachePath(appCachePath);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAppCacheEnabled(true);
// Load the URLs inside the WebView,not in the external web browser
webView.setWebViewClient(new WebViewClient());
if (savedInstanceState == null)
{
if(isNetworkAvailable() == true){
Log.e(TAG,"we have a network connection");
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
webView.loadUrl("http://bmi.cubecore.co.uk");
} else {
Log.e(TAG,"we don't have a network connection");
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ONLY);
webView.loadUrl("http://bmi.cubecore.co.uk");
}
}
} //end of oncreate
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
/**
* Receiving push messages
* */
private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context,Intent intent) {
String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
// Waking up mobile if it is sleeping
WakeLocker.acquire(getApplicationContext());
/**
* Take appropriate action on this message
* depending upon your app requirement
* For now i am just displaying it on the screen
* */
// Showing received message
lblMessage.append(newMessage + "\n");
Toast.makeText(getApplicationContext(),"New Message: " + newMessage,Toast.LENGTH_LONG).show();
// Releasing wake lock
WakeLocker.release();
}
};
@Override
protected void onDestroy() {
super.onDestroy();
// Clear the cache (this clears the WebViews cache for the entire application)
//webView.clearCache(false);
if (mRegisterTask != null) {
mRegisterTask.cancel(true);
}
try {
unregisterReceiver(mHandleMessageReceiver);
GCMRegistrar.onDestroy(this);
} catch (Exception e) {
Log.e("UnRegister Receiver Error","> " + e.getMessage());
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
@Override
protected void onResume() {
super.onResume();
Log.e(TAG,"in onResume in mainactivity");
}
@Override
public File getCacheDir()
{
// NOTE: this method is used in Android 2.1
Log.e(TAG,"getcachedir");
return getApplicationContext().getCacheDir();
}
@Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
// Save the state of the WebView
webView.saveState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
// Restore the state of the WebView
webView.restoreState(savedInstanceState);
}
}
.
这是上面教程中写入sdcard的代码.
package com.bmi.bmitestapp;
import java.io.File;
import android.app.Application;
import android.os.Environment;
import android.util.Log;
public class ApplicationExt extends Application
{
private static final String TAG = ApplicationExt.class.getSimpleName();
// NOTE: the content of this path will be deleted
// when the application is uninstalled (Android 2.2 and higher)
protected File extStorageAppBasePath;
protected File extStorageAppCachePath;
@Override
public void onCreate()
{
super.onCreate();
Log.e(TAG,"inside appext");
// Check if the external storage is writeable
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
// Retrieve the base path for the application in the external storage
File externalStorageDir = Environment.getExternalStorageDirectory();
if (externalStorageDir != null)
{
// {SD_PATH}/Android/data/com.devahead.androidwebviewcacheonsd
extStorageAppBasePath = new File(externalStorageDir.getAbsolutePath() +
File.separator + "Android" + File.separator + "data" +
File.separator + getPackageName());
}
if (extStorageAppBasePath != null)
{
// {SD_PATH}/Android/data/com.devahead.androidwebviewcacheonsd/cache
extStorageAppCachePath = new File(extStorageAppBasePath.getAbsolutePath() +
File.separator + "cache");
boolean isCachePathAvailable = true;
if (!extStorageAppCachePath.exists())
{
// Create the cache path on the external storage
isCachePathAvailable = extStorageAppCachePath.mkdirs();
}
if (!isCachePathAvailable)
{
// Unable to create the cache path
extStorageAppCachePath = null;
}
}
}
}
@Override
public File getCacheDir()
{
// NOTE: this method is used in Android 2.2 and higher
if (extStorageAppCachePath != null)
{
// Use the external storage for the cache
Log.e(TAG,"extStorageAppCachePath = " + extStorageAppCachePath);
return extStorageAppCachePath;
}
else
{
// /data/data/com.devahead.androidwebviewcacheonsd/cache
return super.getCacheDir();
}
}
}
我以为我会包括一点点伐木.这是在网络适配器打开的情况下从全新安装进行的日志记录.
01-29 14:13:10.220: D/dalvikvm(16904): Late-enabling CheckJNI 01-29 14:13:10.470: E/ApplicationExt(16904): inside appext 01-29 14:13:10.720: E/RegisterActivity(16904): in onresume in registeractivity 01-29 14:13:10.880: D/libEGL(16904): loaded /system/lib/egl/libEGL_tegra.so 01-29 14:13:11.000: D/libEGL(16904): loaded /system/lib/egl/libGLESv1_CM_tegra.so 01-29 14:13:11.030: D/libEGL(16904): loaded /system/lib/egl/libGLESv2_tegra.so 01-29 14:13:11.070: D/OpenGLRenderer(16904): Enabling debug mode 0 01-29 14:13:18.390: E/ApplicationExt(16904): extStorageAppCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:13:18.390: D/webview(16904): [InitTabEffectPivot] >> nScreenWidth = 720 01-29 14:13:18.390: D/webview(16904): [InitTabEffectPivot] >> nScreenHeight = 1280 01-29 14:13:18.390: D/sqliteDatabaseCpp(16904): Registering sqlite logging func: /data/data/com.bmi.bmitestapp/databases/webview.db 01-29 14:13:18.390: D/sqliteDatabaseCpp(16904): DB info: open db,path = /data/data/com.bmi.bmitestapp/databases,key = sefraes,flag = 6,cannot stat file,errno = 2,message = No such file or directory 01-29 14:13:18.400: E/MainActivity(16904): in onCreate in mainactivity 01-29 14:13:18.400: D/sqliteDatabaseCpp(16904): DB info: path = /data/data/com.bmi.bmitestapp/databases,handle: 0x1f9a858,type: w,r/w: (0,1),mode: delete,disk free size: 1276 M 01-29 14:13:18.400: D/GCMRegistrar(16904): resetting backoff for com.bmi.bmitestapp 01-29 14:13:18.420: V/GCMRegistrar(16904): Registering app com.bmi.bmitestapp of senders 598080744593 01-29 14:13:18.430: E/ApplicationExt(16904): extStorageAppCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:13:18.430: E/MainActivity(16904): appCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:13:18.430: E/MainActivity(16904): we have a network connection 01-29 14:13:18.430: E/MainActivity(16904): in onResume in mainactivity 01-29 14:13:18.490: W/webcore(16904): java.lang.Throwable: EventHub.removeMessages(int what = 107) is not supported before the WebViewCore is set up. 01-29 14:13:18.490: W/webcore(16904): at android.webkit.WebViewCore$EventHub.removeMessages(WebViewCore.java:1974) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.WebViewCore$EventHub.access$9100(WebViewCore.java:1008) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.WebViewCore.removeMessages(WebViewCore.java:2215) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.WebView.sendOurVisibleRect(WebView.java:3285) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.ZoomManager.setZoomScale(ZoomManager.java:772) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.ZoomManager.access$1900(ZoomManager.java:59) 01-29 14:13:18.490: W/webcore(16904): at android.webkit.ZoomManager$PostScale.run(ZoomManager.java:1345) 01-29 14:13:18.490: W/webcore(16904): at android.os.Handler.handleCallback(Handler.java:608) 01-29 14:13:18.490: W/webcore(16904): at android.os.Handler.dispatchMessage(Handler.java:92) 01-29 14:13:18.490: W/webcore(16904): at android.os.Looper.loop(Looper.java:156) 01-29 14:13:18.490: W/webcore(16904): at android.app.ActivityThread.main(ActivityThread.java:5045) 01-29 14:13:18.490: W/webcore(16904): at java.lang.reflect.Method.invokeNative(Native Method) 01-29 14:13:18.490: W/webcore(16904): at java.lang.reflect.Method.invoke(Method.java:511) 01-29 14:13:18.490: W/webcore(16904): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 01-29 14:13:18.490: W/webcore(16904): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 01-29 14:13:18.490: W/webcore(16904): at dalvik.system.NativeStart.main(Native Method) 01-29 14:13:18.500: W/webcore(16904): java.lang.Throwable: EventHub.removeMessages(int what = 105) is not supported before the WebViewCore is set up. 01-29 14:13:18.500: W/webcore(16904): at android.webkit.WebViewCore$EventHub.removeMessages(WebViewCore.java:1974) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.WebViewCore$EventHub.access$9100(WebViewCore.java:1008) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.WebViewCore.removeMessages(WebViewCore.java:2215) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.WebView.sendViewSizeZoom(WebView.java:3520) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.ZoomManager.setZoomScale(ZoomManager.java:778) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.ZoomManager.access$1900(ZoomManager.java:59) 01-29 14:13:18.500: W/webcore(16904): at android.webkit.ZoomManager$PostScale.run(ZoomManager.java:1345) 01-29 14:13:18.500: W/webcore(16904): at android.os.Handler.handleCallback(Handler.java:608) 01-29 14:13:18.500: W/webcore(16904): at android.os.Handler.dispatchMessage(Handler.java:92) 01-29 14:13:18.500: W/webcore(16904): at android.os.Looper.loop(Looper.java:156) 01-29 14:13:18.500: W/webcore(16904): at android.app.ActivityThread.main(ActivityThread.java:5045) 01-29 14:13:18.500: W/webcore(16904): at java.lang.reflect.Method.invokeNative(Native Method) 01-29 14:13:18.500: W/webcore(16904): at java.lang.reflect.Method.invoke(Method.java:511) 01-29 14:13:18.500: W/webcore(16904): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 01-29 14:13:18.500: W/webcore(16904): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 01-29 14:13:18.500: W/webcore(16904): at dalvik.system.NativeStart.main(Native Method) 01-29 14:13:18.530: D/OpenGLRenderer(16904): Flushing caches (mode 0) 01-29 14:13:18.570: I/sqliteDatabaseCpp(16904): sqlite returned: error code = 1,msg = no such table: CacheGroups 01-29 14:13:18.570: I/sqliteDatabaseCpp(16904): sqlite returned: error code = 1,msg = no such table: Caches 01-29 14:13:18.570: I/sqliteDatabaseCpp(16904): sqlite returned: error code = 1,msg = no such table: Origins 01-29 14:13:18.570: I/sqliteDatabaseCpp(16904): sqlite returned: error code = 1,msg = no such table: DeletedCacheResources 01-29 14:13:18.850: E/ApplicationExt(16904): extStorageAppCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:13:19.330: I/PRIME(16904): <CallBackProxy> Send to WebViewClient. 01-29 14:13:19.370: V/GCMBroadcastReceiver(16904): onReceive: com.google.android.c2dm.intent.REGISTRATION 01-29 14:13:19.370: V/GCMBroadcastReceiver(16904): GCM IntentService class: com.bmi.bmitestapp.GCMIntentService 01-29 14:13:19.370: V/GCMBaseIntentService(16904): Acquiring wakelock 01-29 14:13:19.460: V/GCMBaseIntentService(16904): Intent service name: GCMIntentService-598080744593-1 01-29 14:13:19.470: E/GCMRegistrar(16904): internal error: retry receiver class not set yet 01-29 14:13:19.480: V/GCMRegistrar(16904): Registering receiver 01-29 14:13:19.480: D/GCMBaseIntentService(16904): handleRegistration: registrationId = APA91bFytZvnkmsEVHSnw5VRxIwfPRmPsSRVrgRNRa5ww3oqCfnLEZMaBBNtQtlZoK4RD4VQXfAfKDsQUa53PwQBH_rwuI_gEEdHQhxadpBVmJ7L3Dxy90Bzryg_aCWx20-cdZ32cbiiaGR3zUMjpqZizYQbnARN4w,error = null,unregistered = null 01-29 14:13:19.480: D/GCMRegistrar(16904): resetting backoff for com.bmi.bmitestapp 01-29 14:13:19.480: V/GCMRegistrar(16904): Saving regId on app version 1 01-29 14:13:19.490: I/GCMIntentService(16904): Device registered: regId = APA91bFytZvnkmsEVHSnw5VRxIwfPRmPsSRVrgRNRa5ww3oqCfnLEZMaBBNtQtlZoK4RD4VQXfAfKDsQUa53PwQBH_rwuI_gEEdHQhxadpBVmJ7L3Dxy90Bzryg_aCWx20-cdZ32cbiiaGR3zUMjpqZizYQbnARN4w 01-29 14:13:19.490: D/NAME(16904): hardcoded client name 01-29 14:13:19.490: I/bmi GCM(16904): registering device (regId = APA91bFytZvnkmsEVHSnw5VRxIwfPRmPsSRVrgRNRa5ww3oqCfnLEZMaBBNtQtlZoK4RD4VQXfAfKDsQUa53PwQBH_rwuI_gEEdHQhxadpBVmJ7L3Dxy90Bzryg_aCWx20-cdZ32cbiiaGR3zUMjpqZizYQbnARN4w) 01-29 14:13:19.490: D/bmi GCM(16904): Attempt #1 to register 01-29 14:13:19.500: V/bmi GCM(16904): Posting 'email=hardcoded email®Id=APA91bFytZvnkmsEVHSnw5VRxIwfPRmPsSRVrgRNRa5ww3oqCfnLEZMaBBNtQtlZoK4RD4VQXfAfKDsQUa53PwQBH_rwuI_gEEdHQhxadpBVmJ7L3Dxy90Bzryg_aCWx20-cdZ32cbiiaGR3zUMjpqZizYQbnARN4w&name=hardcoded client name' to http://mobilewebexpert.co.uk/pushtest/register.PHP 01-29 14:13:19.500: E/URL(16904): > http://mobilewebexpert.co.uk/pushtest/register.PHP 01-29 14:13:20.610: V/GCMRegistrar(16904): Setting registeredOnServer status as true until 2013-02-05 14:13:20.617 01-29 14:13:20.620: V/GCMBaseIntentService(16904): Releasing wakelock 01-29 14:13:21.470: D/skia(16904): notifyPluginsOnFrameLoad not postponed 01-29 14:13:21.570: D/sqliteDatabase(16904): Create pool connection 01-29 14:13:21.570: D/sqliteDatabaseCpp(16904): DB info: open db,flag = 1,file size = 12288 01-29 14:13:21.570: D/sqliteDatabaseCpp(16904): DB info: path = /data/data/com.bmi.bmitestapp/databases,handle: 0x2797350,type: r,r/w: (1,mode: wal,disk free size: 1276 M
.
这是我关闭网络适配器后的日志记录.
01-29 14:16:57.080: E/RegisterActivity(16904): in onresume in registeractivity 01-29 14:17:03.490: D/webview(16904): [InitTabEffectPivot] >> nScreenWidth = 720 01-29 14:17:03.490: D/webview(16904): [InitTabEffectPivot] >> nScreenHeight = 1280 01-29 14:17:03.490: E/MainActivity(16904): in onCreate in mainactivity 01-29 14:17:03.490: V/GCMRegistrar(16904): Is registered on server: true 01-29 14:17:03.500: E/ApplicationExt(16904): extStorageAppCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:17:03.500: E/MainActivity(16904): appCachePath = /mnt/sdcard/Android/data/com.bmi.bmitestapp/cache 01-29 14:17:03.500: E/MainActivity(16904): we don't have a network connection 01-29 14:17:03.500: E/MainActivity(16904): in onResume in mainactivity 01-29 14:17:03.500: D/chromium(16904): Unknown chromium error: -400 01-29 14:17:03.540: D/skia(16904): notifyPluginsOnFrameLoad not postponed 01-29 14:17:03.580: D/OpenGLRenderer(16904): Flushing caches (mode 0)
有一点我注意到,它可能没什么,但注册性是指调用MainActivity的活动. RegisterActivity只有一个按钮,可以触发MainActivity的Intent.网络适配器关闭后,我必须按下registerAcivity上的按钮,该按钮调用MainActivity中的onCreate.它就像是一个MainActivity的新实例？这可能会影响webview的缓存.实际上,必须在此过程中调用主要活动的onDestroy.
另一件事引起了我的注意.
01-29 14:17:03.580: D/OpenGLRenderer(16904): Flushing caches (mode 0)
解决方法
对于该特定URL http://bmi.cubecore.co.uk,该http服务器禁止您的WebView缓存,请参阅响应头Cache-Control：
200 OK ... ... Pragma: no-cache Server: Apache/2.2.3 (CentOS) Content-Type: text/html; charset=utf-8 Cache-Control: no-store,no-cache,must-revalidate,post-check=0,pre-check=0 Expires: Thu,19 Nov 1981 08:52:00 GMT
这意味着客户端必须始终从http服务器连接并加载URL,而不是从其本地缓存加载.这也解释了为什么在网络适配器关闭后尝试加载页面时出现未知铬错误：-400.未知的铬错误：-400通常意味着由于某种原因无法连接互联网.
没有登录就无法做任何事情并调整http服务器设置.您可以使用以下URL检查缓存实现：
https://stackoverflow.com/questions/14549638/webview-not-displaying-website-when-offline
响应标头是：
200 OK ... ... Last-Modified: Wed,30 Jan 2013 00:28:59 GMT Vary: * Content-Type: text/html; charset=utf-8 Cache-Control: public,max-age=60 Expires: Wed,30 Jan 2013 00:29:59 GMT
如果代码中没有其他问题,则缓存实现应该可行.
