java.lang.IllegalArgumentException：在触发get请求时,主机名可能不为null

概述我将非常感谢您对此的帮助,下面是我正在尝试执行的代码,但所有我得到的是这个例外,我做了很多更改,但我无法解决这个问题.如果你有任何指针,请告诉我,我在Android4.4.4上运行HttpGetrequest=newHttpGet("https://s3­-eu-­west-­1.amazonaws.com/developer-application-

我将非常感谢您对此的帮助,下面是我正在尝试执行的代码,但所有我得到的是这个例外,我做了很多更改,但我无法解决这个问题.

如果你有任何指针,请告诉我,我在Android 4.4.4上运行

httpGet request = new httpGet("https://s3­-eu-­west-­1.amazonaws.com/developer-application-­test/cart/List");resp = clIEnt.execute(request);01-22 22:25:03.885: W/System.err(14697): java.lang.IllegalArgumentException: Host name may not be null01-22 22:25:03.886: W/System.err(14697):    at org.apache.http.httpHost.<init>(httpHost.java:83)01-22 22:25:03.886: W/System.err(14697):    at org.apache.http.impl.clIEnt.AbstracthttpClIEnt.determineTarget(AbstracthttpClIEnt.java:508)01-22 22:25:03.886: W/System.err(14697):    at org.apache.http.impl.clIEnt.AbstracthttpClIEnt.execute(AbstracthttpClIEnt.java:498)01-22 22:25:03.886: W/System.err(14697):    at org.apache.http.impl.clIEnt.AbstracthttpClIEnt.execute(AbstracthttpClIEnt.java:476)

解决方法:

正如@atish shimpi所提到的,这很可能是由于URL格式不正确造成的.我输入以下代码剪切并在开发电话上调试它：

httpClIEnt httpClIEnt = new DefaulthttpClIEnt();URI url = new URI("https://s3-eu­west­1.amazonaws.com/developer-application­test/cart/List");URI url1 = new URI("https://www.Google.com/");httpGet httpGet = new httpGet(url);httpResponse httpResponse = httpClIEnt.execute(httpGet);httpentity httpentity = httpResponse.getEntity();

如您所见,我添加了另一个URI对象,该对象指向https://www.Google.com/以用作比较.当我调试时,我在创建两个URI对象时设置断点.在为您提供的地址创建相应的URI对象后,主机字段为空…

但是,当我为Google地址创建一个类似的URI对象时,主机字段不为空,这意味着您的地址有问题…

我仍然不太确定为什么方法URI(String spec)无法解析正确的字段.这可能是一个错误,也可能与您的特定URL有关.无论如何,我能够通过获取您提供的链接并手动创建URI对象来最终处理请求,如下所示：

URI uri = new URI("https", "s3-eu-west-1.amazonaws.com", "/developer-application-test/cart/List", null, null);

使用这个手动创建的URI,我可以下载您创建的列表：

"products" : [    {    "product_ID" : "1",    "name" : "Apples",    "price" : 120,    "image" : "https://s3-eu-west-1.amazonaws.com/developer-application-test/images/1.jpg"    },    {    "product_ID" : "2",    "name" : "Oranges",    "price" : 167,    "image" : "https://s3-eu-west-1.amazonaws.com/developer-application-test/images/2.jpg"    },    {    "product_ID" : "3",    "name" : "Bananas",    "price" : 88,    "image" : "https://s3-eu-west-1.amazonaws.com/developer-application-test/images/3.jpg"    },etc....

作为参考点,这是我的最终工作代码：

try{    httpClIEnt httpClIEnt = new DefaulthttpClIEnt();    URI uri = new URI("https", "s3-eu-west-1.amazonaws.com", "/developer-application-test/cart/List", null, null);    httpGet httpGet = new httpGet(uri);    httpResponse httpResponse = httpClIEnt.execute(httpGet);    httpentity httpentity = httpResponse.getEntity();    if (httpentity != null)    {        inputStream inputStream = httpentity.getContent();        BufferedReader bufferedReader = new BufferedReader(new inputStreamReader(inputStream));        StringBuilder stringBuilder = new StringBuilder();        String currentline = null;        while ((currentline = bufferedReader.readline()) != null)        {            stringBuilder.append(currentline + "\n");        }        String result = stringBuilder.toString();        Log.v("http Request Results:",result);        inputStream.close();    }}catch (Exception e){    e.printstacktrace();}

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