Java-apache http客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应

25-02-21 14

如果您对Java-apachehttp客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解Java-apachehtt

如果您对Java-apache http客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应感兴趣，那么这篇文章一定是您不可错过的。我们将详细讲解Java-apache http客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应的各种细节，此外还有关于04_HttpResponse对象及使用其设置cookie详解、android – 从org.apache.http.HttpResponse获取建议的文件名、android.net.http.HttpResponseCache的实例源码、Apache HttpClient临时错误：NoHttpResponseException的实用技巧。

本文目录一览：

Java-apache http客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应
04_HttpResponse对象及使用其设置cookie详解
android – 从org.apache.http.HttpResponse获取建议的文件名
android.net.http.HttpResponseCache的实例源码
Apache HttpClient临时错误：NoHttpResponseException

Java-apache http客户端用法示例，显示cookie的使用以及从HTTPResponse对象提取响应

我正在使用Java Web应用程序中的apache http客户端（v4），并且在以下情况下遇到问题，对于这些情况，我需要简单的用法示例-

（1）如何将Cookie与Apache HTTP客户端一起使用，使用Cookie的可用选项不同

（2）当响应在HTTPResponse对象中可用时，提取字符集，模仿类型，响应头（作为KeyValuePair）和budy（作为byte []）。

答案1

小编典典

1）AS为cookie，请参见示例：

httpcomponents-client-4.1.3 \ examples \ org \ apache \ http \ examples \
client \ ClientCustomContext.java

主要代码：

HttpClient httpclient = new DefaultHttpClient();        try {            // Create a local instance of cookie store            CookieStore cookieStore = new BasicCookieStore();            // Create local HTTP context            HttpContext localContext = new BasicHttpContext();            // Bind custom cookie store to the local context            localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);            HttpGet httpget = new HttpGet("http://www.google.com/");            System.out.println("executing request " + httpget.getURI());            // Pass local context as a parameter            HttpResponse response = httpclient.execute(httpget, localContext);        } finally {            // When HttpClient instance is no longer needed,            // shut down the connection manager to ensure            // immediate deallocation of all system resources            httpclient.getConnectionManager().shutdown();        }

2）您可以从响应中获得所需的一切，并且：

HttpEntity entity = response.getEntity();entity.getContent()

只需阅读以下示例：httpcomponents-client-4.1.3-bin.zip的httpcomponents-client-4.1.3 \
examples \ org \ apache \ http \ examples \
client（可从其网站下载）。

04_HttpResponse对象及使用其设置cookie详解

HttpResponse 对象

Django服务器接收到客户端发送过来的请求后，会将提交上来的这些数据封装成一个 HttpRequest 对象传给视图函数。那么视图函数在处理完相关的逻辑后，也需要返回一个响应给浏览器。而这个响应，我们必须返回 HttpResponseBase 或者他的子类的对象。而 HttpResponse 则是 HttpResponseBase 用得最多的子类。那么接下来就来介绍一下 HttpResponse 及其子类

1. 常用属性

content：返回的内容。
status_code：返回的HTTP响应状态码。
content_type：返回的数据的MIME类型，默认为 text/html 。浏览器会根据这个属性，来显示数据。如果是 text/html ，那么就会解析这个字符串，如果 text/plain ，那么就会显示一个纯文本。常用的 Content-Type 如下： text/html（默认的，html文件） text/plain（纯文本） text/css（css文件） text/javascript（js文件） multipart/form-data（文件提交） application/json（json传输） application/xml（xml文件）
设置请求头： response[''X-Access-Token''] = ''xxxx'' 。

2. 常用方法

init ：使用页内容实例化HttpResponse对象
write(content)：以文件的方式写
flush()：以文件的方式输出缓存区
set_cookie(key, value='''', max_age=None, expires=None)：设置Cookie key、value都是字符串类型 max_age是一个整数，表示在指定秒数后过期 expires是一个datetime或timedelta对象，会话将在这个指定的日期/时间过期，注意datetime和timedelta值只有在使用PickleSerializer时才可序列化如果max_age 和expires 都没有指定，则是表示关闭浏览器就失效
delete_cookie(key)：删除指定的key的Cookie，如果key不存在则什么也不发生

注意：注意:设置cookie值以及删除cookie值都是response对象的操作,而获取cookie是从request相应中获得的.

android – 从org.apache.http.HttpResponse获取建议的文件名

在 Android中,您可以使用org.apache.http类HttpClient,HttpGet和HttpResponse下载文件.如何从HTTP请求中读取建议的文件名？

例如.在PHP中,你会这样做：

header('Content-disposition: attachment; filename=blah.txt');

如何使用Android / Java中的Apache类获取“blah.txt”？

解决方法

BasicHeader header = new BasicHeader("Content-disposition","attachment; filename=blah.txt");
HeaderElement[] helelms = header.getElements();
if (helelms.length > 0) {
    HeaderElement helem = helelms[0];
    if (helem.getName().equalsIgnoreCase("attachment")) {
        NameValuePair nmv = helem.getParameterByName("filename");
        if (nmv != null) {
            System.out.println(nmv.getValue());
        }
    }
}

SYSOUT> blah.txt

android.net.http.HttpResponseCache的实例源码

项目：volley-it 文件：MainActivity.java

/**
 * Fetches an entry value from the Httpresponsecache cache
 * @param connection connection from which we need the cache
 * @param uri uri to use to get the cache entry
 * @return cache entry value as String
 */
private String fetchFromHTTPUrlConnectionCache(HttpURLConnection connection,URI uri) {

    try {
        Httpresponsecache responsecache = Httpresponsecache.getInstalled();
        if(responsecache != null){
            CacheResponse cacheResponse = responsecache.get(uri,"GET",connection.getRequestProperties());
            Scanner scanner = new Scanner(cacheResponse.getBody(),"UTF-8");
            StringBuilder sb = new StringBuilder();
            while (scanner.hasNextLine()){
                sb.append(scanner.nextLine());
            }

            return sb.toString();
        }

    } catch (Exception ex) {
        ex.printstacktrace();
    }
    return null;

}

项目：StreamAds-Android 文件：SampleListActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_single_pane);

    Toolbar toolbar = (Toolbar) findViewById(R.id.app_toolbar);
    setSupportActionBar(toolbar);

    if (savedInstanceState == null) {
        FragmentManager.enableDebugLogging(true);
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container,SampleListFragment.newInstance(),SampleListFragment.TAG)
                .commit();
    }

    // http response cache
    File httpCacheDir = new File(getCacheDir(),"http");
    long httpCacheSize = 100 * 1024 * 1024; // 100 MiB

    try {
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
    } catch (IOException e) {
        Log.i(SampleListActivity.class.getSimpleName(),"HTTP response cache installation Failed:" + e);
    }
}

项目：android-rest-example 文件：MyApplication.java

@Override
public void onCreate() {
    super.onCreate();

    // cookie store
    CookieManager cookieManager = new CookieManager();
    cookieManager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);
    CookieHandler.setDefault(cookieManager);

    // init cache for http responses
    try {
        File httpCacheDir = new File(getApplicationContext().getCacheDir(),"http");
        long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
    } catch(IOException e){
        Log.i(TAG,"HTTP response cache installation Failed:" + e);
    }
}

项目：XDA-One 文件：RetrofitClient.java

public static RestAdapter.Builder getRestBuilder(final Context context,final String url) {
    if (!sresponsecache) {
        try {
            final File httpCacheDir = new File(context.getCacheDir(),"http");
            final long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
            Httpresponsecache.install(httpCacheDir,httpCacheSize);
        } catch (IOException e) {
            e.printstacktrace();
        }
        sresponsecache = true;
    }

    return new RestAdapter.Builder()
            .setEndpoint(url)
            .setConverter(JACKSON_CONVERTER)
            .setRequestInterceptor(new RequestInterceptor() {
                @Override
                public void intercept(RequestFacade request) {
                    request.addHeader("Authorization","Basic " + XDAConstants.ENCODED_AUTHORIZATION);
                }
            });
}

项目：MvpPlus 文件：MyIntentService.java

protected void onStop() {

        Httpresponsecache cache = Httpresponsecache.getInstalled();
        if (cache != null) {
            cache.flush();
        }
    }

项目：Odyssey2017 文件：FeedActivity.java

@Override
protected void onStop() {
    super.onStop();
   Httpresponsecache cache = Httpresponsecache.getInstalled();
    if(cache != null) {  //Clearing the cache
        cache.flush();
    }
}

项目：Odyssey2017 文件：FeedActivity.java

public void cacher()
{
    httpCacheDir = getExternalCacheDir();
    try {
        Httpresponsecache.install(httpCacheDir,httpCacheSize); //Setting the cache
    } catch (Exception e) {
        e.printstacktrace();
    }
}

项目：YalpStore 文件：YalpStoreApplication.java

@Override
public void onCreate() {
    super.onCreate();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        try {
            Httpresponsecache.install(new File(getCacheDir(),"http"),5 * 1024 * 1024);
        } catch (IOException e) {
            Log.e(getClass().getSimpleName(),"Could not register cache " + e.getMessage());
        }
    }
    PreferenceManager.setDefaultValues(this,R.xml.settings,false);
    Thread.setDefaultUncaughtExceptionHandler(new YalpStoreUncaughtExceptionHandler(getApplicationContext()));
    registerDownloadReceiver();
    registerinstallreceiver();
}

项目：pandroid 文件：NetworkUtils.java

/**
 * Enable caching for http request : must use HttpUrlConnection !
 * see : <a href="http://developer.android.com/reference/android/net/http/Httpresponsecache.html">Httpresponsecache</a>
 *
 * @param context
 */
public static void enableHttpCaching(Context context) {
    long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
    try {
        File httpCacheDir = new File(context.getCacheDir(),"http");
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
    } catch (IOException e) {
        Log.i("","HTTP response cache Failed:" + e);
    }
}

项目：Android-High-Performance-Programming 文件：responsecache.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    try {
        File httpCacheDir = new File(getCacheDir(),"http");
        long httpCacheSize = 0;
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
    } catch (IOException e) {
        Log.i(getClass().getName(),"HTTP response cache installation Failed:" + e);
    }
}

项目：Android-High-Performance-Programming 文件：responsecache.java

protected void onStop() {
    super.onStop();
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：android-restless 文件：FileCache.java

@Override
public void put(Request key,HttpResponse value) {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：android-restless 文件：FileCache.java

@Override
public void clear() throws IOException {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.delete();
    }
    Httpresponsecache.install(file,size);
}

项目：android-lite 文件：MainActivity.java

@Override
protected void onStop() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        final Httpresponsecache cache = Httpresponsecache.getInstalled();
        if (cache != null) {
            cache.flush();
        }
    }

    super.onStop();
}

项目：android-lite 文件：MainActivity.java

@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private void enableHttpresponsecache() {
    final long httpCacheSize = 10 * 1024 * 1024;
    final File httpCacheDir = new File(getCacheDir(),"http");

    try {
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
    } catch (final IOException e) {
        throw new RuntimeException(e);
    }
}

项目：PowerToggles 文件：ThemePicker.java

@Override
protected void onPause() {
  Httpresponsecache cache = Httpresponsecache.getInstalled();
  if (cache != null) {
      cache.flush();
  }
  super.onPause();
}

项目：volley-it 文件：MainActivity.java

/**
 * Installs the Httpresponsecache
 * Note this will only work on Android 4.0+
 */
private void enableHttpresponsecache() {
    try {
        long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
        File httpCacheDir = new File(getCacheDir(),httpCacheSize);
    } catch (Exception httpresponsecacheNotAvailable) {
        Log.d(TAG,"HTTP response cache is unavailable.");
    }
}

项目：volley-it 文件：MainActivity.java

/**
 * Invalidates both Httpresponsecache and Volley cache
 * @param view
 */
public void invalidateCache(View view) {

    mRequestQueue.getCache().clear();
    try {
        Httpresponsecache cache = Httpresponsecache.getInstalled();
        if(cache != null) cache.delete();
    } catch (IOException e) {
        e.printstacktrace();
    }
    Toast.makeText(this,"Cache is Now empty",Toast.LENGTH_SHORT).show();

}

项目：mbira-android-template 文件：LoadingActivity.java

@Override
protected void onStop() {
    super.onStop();
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：wordpress_app_android 文件：wordpress.java

private static void enableHttpresponsecache(Context context) {
    try {
        long httpCacheSize = 5 * 1024 * 1024; // 5MB
        File httpCacheDir = new File(context.getCacheDir(),httpCacheSize);
    } catch (IOException e) {
        AppLog.w(T.UTILS,"Failed to enable http response cache");
    }
}

项目：sonarflow-android 文件：MainActivity.java

protected void onStop() {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
    super.onStop();
}

项目：lighthttp 文件：CacheUtil.java

@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private static Httpresponsecache installHttpresponsecache(final File cacheDir)
        throws IOException {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache == null) {
        final long maxSize = calculatediskCacheSize(cacheDir);
        cache = Httpresponsecache.install(cacheDir,maxSize);
    }
    return cache;
}

项目：mc_backup 文件：UrlConnectionDownloader.java

static Object install(Context context) throws IOException {
  File cacheDir = Utils.createDefaultCacheDir(context);
  Httpresponsecache cache = Httpresponsecache.getInstalled();
  if (cache == null) {
    long maxSize = Utils.calculatediskCacheSize(cacheDir);
    cache = Httpresponsecache.install(cacheDir,maxSize);
  }
  return cache;
}

项目：FullRobolectricTestSample 文件：ShadowHttpresponsecache.java

@Implementation
public static Httpresponsecache install(File directory,long maxSize) {
  Httpresponsecache cache = newInstanceOf(Httpresponsecache.class);
  ShadowHttpresponsecache shadowCache = Robolectric.shadowOf(cache);
  shadowCache.originalObject = cache;
  shadowCache.directory = directory;
  shadowCache.maxSize = maxSize;
  synchronized (LOCK) {
    installed = shadowCache;
    return cache;
  }
}

项目：FullRobolectricTestSample 文件：HttpresponsecacheTest.java

@Test
public void installedCacheIsReturned() throws Exception {
  assertthat(Httpresponsecache.getInstalled()).isNull();
  Httpresponsecache cache = Httpresponsecache.install(File.createTempFile("foo","bar"),42);
  Httpresponsecache installed = Httpresponsecache.getInstalled();
  assertthat(installed).isSameAs(cache);
  assertthat(installed.maxSize()).isEqualTo(42);
}

项目：FullRobolectricTestSample 文件：HttpresponsecacheTest.java

@Test
public void countsstartAtZero() throws Exception {
  Httpresponsecache cache = Httpresponsecache.install(File.createTempFile("foo",42);
  assertthat(cache.getHitCount()).isZero();
  assertthat(cache.getNetworkCount()).isZero();
  assertthat(cache.getRequestCount()).isZero();
}

项目：CampusFeedv2 文件：Api.java

private Api(Context context) {
    try {
        File httpCacheDir = new File(context.getCacheDir(),httpCacheSize);
    } catch (IOException e) {
        Log.i("Api","HTTP response cache installation Failed:" + e);
    }
}

项目：CampusFeedv2 文件：Api.java

@Override
public void close() throws IOException {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：picasso 文件：UrlConnectionDownloader.java

static Object install(Context context) throws IOException {
  File cacheDir = Utils.createDefaultCacheDir(context);
  Httpresponsecache cache = Httpresponsecache.getInstalled();
  if (cache == null) {
    long maxSize = Utils.calculatediskCacheSize(cacheDir);
    cache = Httpresponsecache.install(cacheDir,maxSize);
  }
  return cache;
}

项目：Qshp 文件：PostContentActivity.java

@Override
public void onStop() {
    super.onStop();
    mAdapter.changeCursor(null);
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：UnCafe 文件：CoffeePlacesApplication.java

/**
 *
 */
private void initCacheFile() {
    try {
        httpCacheDir = new File(getCacheDir(),"http");
        httpCacheDir.setReadable(true);
        Httpresponsecache.install(httpCacheDir,httpCacheSize);
        cache = new Cache(httpCacheDir,httpCacheSize);
    } catch (Exception e) {
        e.printstacktrace();
    }
}

项目：android-rest-example 文件：MyApplication.java

@Override
public void onTerminate() {
    super.onTerminate();

    // Todo clear cookiestore content here

    // remove cached files
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }
}

项目：Podcatcher-Deluxe-Android-Studio 文件：Podcatcher.java

@Override
public void run() {
    Process.setThreadPriority(THREAD_PRIORITY_BACKGROUND);

    final Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null)
        cache.flush();
}

项目：PkRSS 文件：DefaultDownloader.java

public DefaultDownloader(Context context)  {
    cacheDir = new File(context.getCacheDir(),"http");
    try {
        Httpresponsecache.install(cacheDir,cacheSize);
    }
    catch (IOException e) {
        Log.i(TAG,"HTTP response cache installation Failed:" + e);
    }
}

项目：SadPanda 文件：SadPandaApp.java

@Override
public void onCreate() {
    super.onCreate();

    File httpCacheDir = new File(getCacheDir(),HTTP_CACHE_SIZE);
    }
    catch (IOException e) {
        Log.e(TAG,"Failed to create http cache!",e);
    }
}

项目：Impeller 文件：ImpellerApplication.java

private void tryInstallresponsecache() {
    if(Httpresponsecache.getInstalled() == null) {
        File cacheDir = new File(getCacheDir(),"http");
        try {
            Httpresponsecache.install(cacheDir,10 * 1024 * 1024);
        } catch (IOException e) {
            Log.w(TAG,"Creating response cache",e);
        }
    }
}

项目：aview 文件：AviewApplication.java

@AfterInject
@Trace(tag = TAG,level = Log.DEBUG)
void init() {

    // if (BuildConfig.DEBUG) {
    // aviewPrefs.pref_openedDrawer().put(false);
    // }

    // Create a unique id for this install if one doesn't already exist
    if (!aviewPrefs.ivid().exists()) {
        if (Log.isLoggable(TAG,Log.DEBUG))
            Log.d(TAG,"Creating new ivid");
        aviewPrefs.ivid().put(UUID.randomUUID().toString());
    }

    if (Log.isLoggable(TAG,Log.DEBUG))
        Log.d(TAG,"ivid=" + aviewPrefs.ivid().get());

    // Create a cache for automatically caching HTTP requests
    try {
        File httpCacheDir = new File(this.getCacheDir(),httpCacheSize);
    } catch (IOException e) {
        if (Log.isLoggable(TAG,Log.INFO))
            Log.i(TAG,"HTTP response cache installation Failed:" + e);
    }
}

项目：aview 文件：AviewApplication.java

@Override
@Trace
public void onTerminate() {
    super.onTerminate();
    aviewVideoService.close();

    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }

}

项目：xr 文件：HomeActivity.java

@Override
protected void onStop() {
    Httpresponsecache cache = Httpresponsecache.getInstalled();
    if (cache != null) {
        cache.flush();
    }

    eventBus.unregister(this);
    super.onStop();
}

项目：android-restless 文件：FileCache.java

public FileCache(File file,long size) throws IOException {
    this.file = file;
    this.size = size;
    Httpresponsecache.install(file,size);
}

Apache HttpClient临时错误：NoHttpResponseException

我有一个Web服务正在接受XML的POST方法。它工作正常，然后在某个随机的时刻，它无法与服务器通信，并抛出message，并抛出IOException
The target server failed to respond。后续调用工作正常。

当我打了一些电话然后将应用程序闲置大约10-15分钟时，它就会发生。在此之后我进行的第一个调用将返回此错误。

我尝试了几件事…

我像这样设置重试处理程序

HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler() {            public boolean retryRequest(IOException e, int retryCount, HttpContext httpCtx) {                if (retryCount >= 3){                    Logger.warn(CALLER, "Maximum tries reached, exception would be thrown to outer block");                    return false;                }                if (e instanceof org.apache.http.NoHttpResponseException){                    Logger.warn(CALLER, "No response from server on "+retryCount+" call");                    return true;                }                return false;            }        };        httpPost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, retryHandler);

但是此重试从未被调用过。（是的，我正在使用正确的instanceof子句）。在调试时，此类永远不会被调用。

我什至尝试设置HttpProtocolParams.setUseExpectContinue(httpClient.getParams(),false);但没有用。有人可以建议我现在可以做什么吗？

重要事项 除了弄清楚为什么我会得到例外，我还有一个重要的担忧是为什么重试处理程序不在这里工作？

答案1

小编典典

由连接管理器保持活动状态的最有可能的持久连接变得陈旧。也就是说，目标服务器会在其连接空闲时关闭其末端的连接，而HttpClient无法对该事件做出反应，从而使连接半关闭或“陈旧”。通常这不是问题。HttpClient使用多种技术来验证从池中租借时的连接有效性。即使禁用了过时的连接检查并且使用了过时的连接来传输请求消息，请求执行通常也会在具有SocketException的写操作中失败，并会自动重试。但是，在某些情况下，写操作可以毫无例外地终止，随后的读操作将返回-1（流的结尾）。

解决此问题的最简单方法是将过期的连接和闲置了超过一段时间（例如，在池中闲置一分钟之后）之后空闲的连接驱逐出去。有关详细信息，请参见HttpClient教程的本节。

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