java http请求方式

方式一：

URL restServiceURL = new URL(URL+URl);

HttpURLConnection httpConnection = (HttpURLConnection) restServiceURL.openConnection();

httpConnection.setRequestMethod("GET");

httpConnection.addRequestProperty("Content-type","application/json");

// httpConnection.addRequestProperty("Date", Date);

// httpConnection.addRequestProperty("X-Auth", sign);

// httpConnection.addRequestProperty("Content-Md5", content_Md5);

int responseCode = httpConnection.getResponseCode();

if (responseCode >= 400 )

{ InputStream is = httpConnection.getErrorStream();

BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

StringBuffer sbf = new StringBuffer();

String temp = null;

while ((temp = br.readLine()) != null)

{ sbf.append(temp); sbf.append("\r\n"); }

restResponse = sbf.toString();

 

}

else{

InputStream inputStream = null;

InputStreamReader inputStreamReader = null;

BufferedReader reader = null;

StringBuffer resultBuffer = new StringBuffer();

inputStream = httpConnection.getInputStream();

inputStreamReader = new InputStreamReader(inputStream);

reader = new BufferedReader(inputStreamReader);

 

while ((restResponse = reader.readLine()) != null) {

resultBuffer.append(restResponse);

}

}

方式二：

HttpClient client = HttpClients.createDefault();

HttpGet request = new HttpGet(testUrl);

request.setHeader("Content-type", "application/json");

request.setHeader("Date", Date);

request.setHeader("X-Auth", sign);

request.setHeader("Content-Md5", content_Md5);

HttpResponse response = client.execute(request);

if (response.getCode()==200){

HttpEntity entity = response.getEntity();

BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));

}

else {}