从NameValuePairs列表创建UrlEncodedFormEntity会抛出NullPointerException [英] Creating a UrlEncodedFormEntity from a List of NameValuePairs throws a NullPointerException

问题描述

我正在创建一个单元测试来试用我刚刚创建的servlet。

I'm creating a unit test to try out the servlet I just created.

@Test
public void test() throws ParseException, IOException {

  HttpClient client = new DefaultHttpClient();
  HttpPost post = new HttpPost("http://localhost:8080/WebService/MakeBaby");

  List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

  nameValuePairs.add(new BasicNameValuePair("father_name", "Foo"));
  nameValuePairs.add(new BasicNameValuePair("mother_name", "Bar"));

  post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
  HttpResponse response = null;

  try {
    response = client.execute(post);
  } catch (ClientProtocolException e) {
    e.printStackTrace();
  } catch (IOException e) {
    e.printStackTrace();
  }

  String stringifiedResponse = EntityUtils.toString(response.getEntity());

  System.out.println(stringifiedResponse);

  assertNotNull(stringifiedResponse);
}

以下行生成NullPointerException：

The following line generates a NullPointerException:

post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

我有什么遗漏吗？

推荐答案

很抱歉这个愚蠢的问题，只需添加utf-8格式即可解决。

Sorry for the stupid question, just solved it by adding the utf-8 format.

post.setEntity(new UrlEncodedFormEntity(nameValuePairs, "utf-8"));

创建 UrlEncodedFormEntity 如果没有传递格式将使用 DEFAULT_CONTENT_CHARSET 这是 ISO-8859-1

其中让我感到困惑......是什么导致它抛出 NullPointerException ？

Which baffles me... what's causing it to throw NullPointerException?

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