如何设置HttpDefaultClient的超时时间？

Question

如何设置HttpDefaultClient的超时时间？

对于下面的代码，我想设置一些时间，以便它不会挂起更长的时间。

String methodName = "getResponseFromGlobalService";
logger.info(methodName + " started " + "with" + restUrl + "inputs" + jsonObject.toString());
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost postRequest = new HttpPost(restUrl);
StringBuffer outputDocument = new StringBuffer();
StringEntity input1 = new StringEntity(jsonObject.toString());
input1.setContentType("application/json");
postRequest.setEntity(input1);
HttpResponse response = httpClient.execute(postRequest);

if (response.getStatusLine().getStatusCode() != 200) {
  throw new RuntimeException("Failed : HTTP error code : " + response.getStatusLine().getStatusCode());
}

BufferedReader br = new BufferedReader(new InputStreamReader((response.getEntity().getContent())));

String output;
logger.info("Output from Server .... \n");
while ((output = br.readLine()) != null) {
  outputDocument.append(output);
}

JSONObject json = (JSONObject) JSONSerializer.toJSON(outputDocument.toString());
logger.info(methodName + " ended ");
return json;

Answer 1

如果您使用的是DefaultHttpClient 3.x，那么您需要的两个方法是HttpConnectionParams.html.setConnectionTimeout()和HttpConnectionParams.html.setSoTimeout()，它们分别设置连接超时和套接字超时。连接超时是等待建立连接的持续时间，而套接字超时是等待数据的持续时间。

所以你会像这样使用它们：

HttpConnectionParams httpParams = new HttpConnectionParams();

int connectionTimeout = 30000; // some timeout in milliseconds
httpParams.setConnectionTimeout(connectionTimeout );

int socketTimeout = 30000; // some timeout in milliseconds
httpParams.setSoTimeout(socketTimeout);

DefaultHttpClient httpClient = new DefaultHttpClient(httpParams);

现在，如果你使用DefaultHttpClient 4.x，（在这种情况下你应该使用HttpClientBuilder而不是DefaultHttpClient），那么这些是相关的方法：

1. RequestConfig.Builder.setConnectTimeout
2. RequestConfig.Builder.setSocketTimeout
3. RequestConfig.Builder.setConnectionTimeout

以下是一个例子。

int connectTimeout = 50000;
int requestTimeout = 50000;
int socketimeout = 50000;
RequestConfig requestConfig = 
    RequestConfig.custom()
        .setConnectTimeout(connectTimeout)
        .setConnectionRequestTimeout(requestTimeout)
        .setSocketTimeout(socketTimeout)
        .build();
HttpClient httpClient = 
    HttpClientBuilder.create()
        .setDefaultRequestConfig(requestConfig )
        .build();