Java Post request parameter format is XML

Method 1:
public static void PostXml1(String url, String xml) throws IOException {<!-- -->
        OkHttpClient client = new OkHttpClient().newBuilder().build();
        //okhttp3.MediaType mediaType = okhttp3.MediaType.parse("application/xml");
        okhttp3.MediaType mediaType = okhttp3.MediaType.parse("text/xml");
        //RequestBody body = RequestBody.create(mediaType, "<messages xmlns="http://www.neusoft.com/hit/rhin">\r\\
 <heartbeat>\ r\\
 0\r\\
 </heartbeat>\r\\
 <switchset>\r\\
 <authority>\r\\
 <authoritytype>\r\\
 0\ \r\\
 </authoritytype>\r\\
 <username/>\r\\
 <userpwd/>\r\\
 <license/>\r\\
 </authority>\ \r\\
 <visitor>\r\\
 <!-- Caller 22-bit organization code -->\r\\
 <sourceorgan>\r\\
 3301060000000000000000\r\\
 < /sourceorgan>\r\\
 <!-- Caller's 10-digit access system code-->\r\\
 <sourcedomain>\r\\
 3301000013\r\\
 </sourcedomain> \r\\
 </visitor>\r\\
 d\r\\
 <serviceinf>\r\\
 <servicecode>\r\\
 XBSJCJCJJ:PCRWHHQJ\r\\
 < /servicecode>\r\\
 </serviceinf>\r\\
 <provider>\r\\
 <targetorgan/>\r\\
 <targetdomain/>\r\\
 </ provider>\r\\
 <route/>\r\\
 <process/>\r\\
 </switchset>\r\\
 <business>\r\\
 <standardcode/ >\r\\
 <requestset>\r\\
 <reqcondition/>\r\\
 <reqpaging>\r\\
 0\r\\
 </reqpaging>\r\ \
 <reqpageindex>\r\\
 -1\r\\
 </reqpageindex>\r\\
 <reqpageset>\r\\
 0\r\\
 </reqpageset>\ \r\\
 </requestset>\r\\
 <datacompress>\r\\
 0\r\\
 </datacompress>\r\\
 <daqtaskid>\r\\
 20231109000000001\r\\
 </daqtaskid>\r\\
 <businessdata>\r\\
 <!--Declaration type 0: Total statement/1: Single statement-->\r\ n <declaretype>\r\\
 0\r\\
 </declaretype>\r\\
 <!--Collection type 0: incremental collection-->\r\\
 <collecttype> \r\\
 0\r\\
 </collecttype>\r\\
 <!--Declare the situation of uploading one-day incremental data on June 6 for outpatient (emergency) clinic registration business--> \r\\
 <totaldeclare>\r\\
 <!--Exchange standard coding example: outpatient (emergency) clinic registration-->\r\\
 <colrescode>\r\\
 REQ .C0101.0302.02\r\\
 </colrescode>\r\\
 <!--Number of tasks-->\r\\
 <tasknum>\r\\
 5\r\ n </tasknum>\r\\
 <!--Data start time-->\r\\
 <begindatetime>\r\\
 20221124000000\r\\
 </begindatetime>\r \\
 <!--Data end time-->\r\\
 <enddatetime>\r\\
 20221124235959\r\\
 </enddatetime>\r\\
 <!--One Overall description of the data set-->\r\\
 <tdeclare>\r\\
 <!--Outpatient (emergency) clinic registration-->\r\\
 <setcode>\r\ \
 C0101.0302.02\r\\
 </setcode>\r\\
 <!--Number of records-->\r\\
 <datanum>\r\\
 500\r\ \
 </datanum>\r\\
 </tdeclare>\r\\
 </totaldeclare>\r\\
 </businessdata>\r\\
 <returnmessage>\r\ n <retcode/>\r\\
 <retext/>\r\\
 </returnmessage>\r\\
 </business>\r\\
 <extendset/>\r\ n</messages>");
        RequestBody body = RequestBody.create(mediaType, "<messages xmlns="http://www.neusoft.com/hit/rhin"><heartbeat>0</heartbeat><switchset><authority ><authoritytype>0</authoritytype><username/><userpwd/><license/></authority><visitor><!-- The 22-digit institution code of the caller --><sourceorgan>3301060000000000000000</sourceorgan>< !-- Caller's 10-digit access system code--><sourcedomain>3301000013</sourcedomain></visitor>d<serviceinf><servicecode>XBSJCJCJJ:PCRWHHQJ</servicecode></serviceinf><provider><targetorgan/ ><targetdomain/></provider><route/><process/></switchset><business><standardcode/><requestset><reqcondition/><reqpaging>0</reqpaging><reqpageindex>-1</ reqpageindex><reqpageset>0</reqpageset></requestset><datacompress>0</datacompress><daqtaskid>20231109000000001</daqtaskid><businessdata><!--Declaration type 0: Total statement/1: Single statement- ->\r\\
 <declaretype>\r\\
 0\r\\
 </declaretype>\r\\
 <!--Collection type 0: incremental collection-->\ r\\
 <collecttype>\r\\
 0\r\\
 </collecttype>\r\\
 <!--Statement that outpatient (emergency) clinic registration business will be uploaded on June 6th. The situation of quantitative data-->\r\\
 <totaldeclare>\r\\
 <!--Example of exchange standard coding: outpatient (emergency) clinic registration-->\r\\
 <colrescode> \r\\
 REQ.C0101.0302.02\r\\
 </colrescode>\r\\
 <!--Number of tasks-->\r\\
 <tasknum>\r\ n 5\r\\
 </tasknum>\r\\
 <!--Data start time-->\r\\
 <begindatetime>20221124000000</begindatetime><!--Data end time- -><enddatetime>20221124235959</enddatetime><!--Overall description of a data set--><tdeclare><!--Outpatient (emergency) clinic registration--><setcode>C0101.0302.02</setcode> <!--Number of records--><datanum>500</datanum></tdeclare></totaldeclare></businessdata><returnmessage><retcode/><retext/></returnmessage></business><extendset /></messages>");
        //RequestBody body = RequestBody.create(mediaType, "");
        Request request = new Request.Builder()
                .url("https://www.baidu.com/sc/totalDeclare?short-access=aaa68ed6397a4595b4d3e1c37533b6ac")
                .method("POST", body)
                .addHeader("Content-Type", "text/xml")
                //.addHeader("short-access-token", "aaa68ed6397a4595b4d3e1c37533b6ac")
                .build();
Response response = client.newCall(request).execute();
                               String responseBody = response.body().toString();
        System.out.println(responseBody);
    }
Method 2:
private String invoke(String requestUrl, String requestXml) throws Exception {<!-- -->
StringBuilder builder = new StringBuilder();
HttpURLConnection connection = getHttpURLConnection(requestUrl);
//output stream
OutputStream outputStream = connection.getOutputStream();
outputStream.write(requestXml.getBytes(StandardCharsets.UTF_8));
outputStream.close();
// input stream
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();
}

/**
 * Get HttpURLConnection
 */
private HttpURLConnection getHttpURLConnection(String requestUrl) throws Exception {<!-- -->
URL url = new URL(requestUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
\t
connection.setConnectTimeout(3000);
connection.setReadTimeout(3000);
\t
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
\t
connection.setRequestMethod("POST");
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("Content-type", "application/xml");
return connection;
}

Method 3:
<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));
post.setEntity(new StringEntity(xml, StandardCharsets.UTF_8));

CloseableHttpClient client = HttpClients.createDefault();
CloseableHttpResponse response = client.execute(post);

return response.getStatusLine().getStatusCode() == 200 ? EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8) : null;
}