Android无法使用HttpPost-java.net.UnknownHostException解析主机

在我的应用程序中，我用HttpPost解析json，如下所示

`

我的清单文件已正确设置为internet访问

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <uses-permission android:name="android.permission.INTERNET" />

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事实上我找到了解决办法。这条线

HttpPost httpGet = new HttpPost(url);

必须用HttpGet as替换

 HttpGet httpGet = new HttpGet(url);

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我发现最好的一个是android开发者培训，下面是链接

连接并下载数据

// Given a URL, establishes an HttpUrlConnection and retrieves // the web page content as a InputStream, which it returns as a string. private String downloadUrl(String myurl) throws IOException { InputStream is = null; // Only display the first 500 characters of the retrieved // web page content. int len = 500; try { URL url = new URL(myurl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(10000 /* milliseconds */); conn.setConnectTimeout(15000 /* milliseconds */); conn.setRequestMethod("GET"); conn.setDoInput(true); // Starts the query conn.connect(); int response = conn.getResponseCode(); Log.d(DEBUG_TAG, "The response is: " + response); is = conn.getInputStream(); // Convert the InputStream into a string String contentAsString = readIt(is, len); return contentAsString; // Makes sure that the InputStream is closed after the app is // finished using it. } finally { if (is != null) { is.close(); } } } //给定URL，建立HttpUrlConnection并检索 //网页内容以InputStream的形式显示，并以字符串的形式返回。 私有字符串下载URL（字符串myurl）引发IOException{ InputStream=null； //仅显示检索到的文件的前500个字符 //网页内容。 int len=500； 试一试{ URL=新URL（myurl）； HttpURLConnection conn=（HttpURLConnection）url.openConnection（）； conn.setReadTimeout（10000/*毫秒*/）； conn.setConnectTimeout（15000/*毫秒*/）； conn.setRequestMethod（“GET”）； conn.setDoInput（真）； //启动查询 连接（）； int response=conn.getResponseCode（）； Log.d（DEBUG_标记，“响应为：”+response）； is=conn.getInputStream（）； //将InputStream转换为字符串 字符串contentAsString=readIt（is，len）； 返回contentAsString； //确保在应用程序启动后关闭InputStream //用完了。 }最后{ 如果（is！=null）{ is.close（）； } } } 将InputStream转换为字符串

// Reads an InputStream and converts it to a String. public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException { Reader reader = null; reader = new InputStreamReader(stream, "UTF-8"); char[] buffer = new char[len]; reader.read(buffer); return new String(buffer); } //读取InputStream并将其转换为字符串。 公共字符串readIt（InputStream stream，int len）引发IOException、UnsupportedEncodingException{ Reader=null； 读卡器=新的InputStreamReader（流，“UTF-8”）； char[]buffer=新字符[len]； 读（缓冲区）； 返回新字符串（缓冲区）； }

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从浏览器中启动查询。-android浏览器在android emulator浏览器中键入URL，并查看结果是否出现。。。有时仿真器无法连接到Internet当您说“有时仅”时，它是否可能在您的手机上工作，但在仿真器中不工作？或者它“有时在手机中工作”和“有时在模拟器中工作”？您在哪里运行上述代码？在活动或服务中？ // Given a URL, establishes an HttpUrlConnection and retrieves // the web page content as a InputStream, which it returns as a string. private String downloadUrl(String myurl) throws IOException { InputStream is = null; // Only display the first 500 characters of the retrieved // web page content. int len = 500; try { URL url = new URL(myurl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(10000 /* milliseconds */); conn.setConnectTimeout(15000 /* milliseconds */); conn.setRequestMethod("GET"); conn.setDoInput(true); // Starts the query conn.connect(); int response = conn.getResponseCode(); Log.d(DEBUG_TAG, "The response is: " + response); is = conn.getInputStream(); // Convert the InputStream into a string String contentAsString = readIt(is, len); return contentAsString; // Makes sure that the InputStream is closed after the app is // finished using it. } finally { if (is != null) { is.close(); } } } // Reads an InputStream and converts it to a String. public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException { Reader reader = null; reader = new InputStreamReader(stream, "UTF-8"); char[] buffer = new char[len]; reader.read(buffer); return new String(buffer); }