引言：在对接接口时，接口的请求参数为XML格式，响应结果也为XML，下面介绍两种请求方法：
方法一：
private String invoke(String requestUrl, String requestXml) throws Exception {
StringBuilder builder = new StringBuilder();
HttpURLConnection connection = getHttpURLConnection(requestUrl);
// 输出流
OutputStream outputStream = connection.getOutputStream();
outputStream.write(requestXml.getBytes(StandardCharsets.UTF_8));
outputStream.close();
// 输入流
InputStream inputStream = connection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String line = null;
while ((line = bufferedReader.readLine()) != null) {
builder.append(line);
}
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
connection.disconnect();
return builder.toString();
}
/**
* 获取HttpURLConnection
*/
private HttpURLConnection getHttpURLConnection(String requestUrl) throws Exception {
URL url = new URL(requestUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(3000);
connection.setReadTimeout(3000);
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("Content-type", "application/xml");
return connection;
}方法二：
引入httpclient依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>public static String postXmlRequest(String url, String xml) throws Exception {
HttpPost post = new HttpPost(url);
post.setHeader("Content-type", "text/xml");
post.setEntity(new StringEntity(xml));
CloseableHttpClient client = HttpClients.createDefault();
CloseableHttpResponse response = client.execute(post);
return response.getStatusLine().getStatusCode() == 200 ? EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8) : null;
}路漫漫其修远兮，吾将上下而求索
译文：在追寻真理方面，前方的道路还很漫长，但我将百折不挠，不遗余力地去追求和探索。
如果您有什么好的想法与方法，欢迎在评论区留言，我们一起讨论~
