HttpPost方式调用接口的3种方式

第一种：需要httpclient的依赖包

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.5</version>
</dependency>

会用到httpcore-4.3.5.jar和httpcore-4.3.2.jar

public static String callBgrsjk(String requestParams) {
String url = null;
JSONObject jb=new JSONObject();
jb.put("code",0);
try {
CloseableHttpClient httpClient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom()
.setSocketTimeout(300 * 1000)
.setConnectTimeout(300 * 1000)
.build();
url = "http://URL:Port/地址";
HttpPost post = new HttpPost(url);
post.setConfig(requestConfig);
post.setHeader("Content-Type","application/json;charset=utf-8");
StringEntity postingString = new StringEntity(requestParams,
"utf-8");
post.setEntity(postingString);
HttpResponse response = httpClient.execute(post);
String content = EntityUtils.toString(response.getEntity());
System.out.println(content);
return content;
} catch (SocketTimeoutException e) {
LoggerUtil.error("调用Dat+"
+ ".aService接口超时,超时时间:" + 300
+ "秒,url:" + url + ",参数：" + requestParams, e);
return jb.toString();
} catch (Exception e) {
LoggerUtil.error("调用DataService接口失败,url:" + url + ",参数：" + requestParams,
e);
return jb.toString();
}
}

第二种：使用jdk中的URL

/**
* 发送Http post请求
*
* @param xmlInfo
* json转化成的字符串
* @param URL
* 请求url
* @return 返回信息
*/

public static String doHttpPost(String xmlInfo, String URL) {
System.out.println("发起的数据:" + xmlInfo);
byte[] xmlData = xmlInfo.getBytes();
InputStream instr = null;
java.io.ByteArrayOutputStream out = null;
try {
URL url = new URL(URL);
URLConnection urlCon = url.openConnection();
urlCon.setDoOutput(true);
urlCon.setDoInput(true);
urlCon.setUseCaches(false);
urlCon.setRequestProperty("content-Type", "application/json");
urlCon.setRequestProperty("charset", "utf-8");
urlCon.setRequestProperty("Content-length",
String.valueOf(xmlData.length));
System.out.println(String.valueOf(xmlData.length));
DataOutputStream printout = new DataOutputStream(
urlCon.getOutputStream());
printout.write(xmlData);
printout.flush();
printout.close();
instr = urlCon.getInputStream();
byte[] bis = IOUtils.toByteArray(instr);
String ResponseString = new String(bis, "UTF-8");
if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {
System.out.println("返回空");
}
System.out.println("返回数据为:" + ResponseString);
return ResponseString;

} catch (Exception e) {
e.printStackTrace();
return "0";
} finally {
try {
if(out!=null){
out.close();
}
if(instr!=null){
instr.close();
}
} catch (Exception ex) {
return "0";
}
}
}

第三种：使用apache的commons包

 

/**
* 发送post请求
*
* @param params
* 参数
* @param requestUrl
* 请求地址
* @param authorization
* 授权书
* @return 返回结果
* @throws IOException
*/
public static String sendPost(String params, String requestUrl,
String authorization) throws IOException {

byte[] requestBytes = params.getBytes("utf-8"); // 将参数转为二进制流
HttpClient httpClient = new HttpClient();// 客户端实例化
PostMethod postMethod = new PostMethod(requestUrl);
//设置请求头Authorization
//postMethod.setRequestHeader("Authorization", "Basic " + authorization);
// 设置请求头 Content-Type
postMethod.setRequestHeader("Content-Type", "application/json");
InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,
requestBytes.length);
RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
requestBytes.length, "application/json; charset=utf-8"); // 请求体
postMethod.setRequestEntity(requestEntity);
httpClient.executeMethod(postMethod);// 执行请求
InputStream soapResponseStream = postMethod.getResponseBodyAsStream();// 获取返回的流
byte[] datas = null;
try {
datas = readInputStream(soapResponseStream);// 从输入流中读取数据
} catch (Exception e) {
e.printStackTrace();
}
String result = new String(datas, "UTF-8");// 将二进制流转为String
// 打印返回结果
// System.out.println(result);

return result;
}