post请求加json参数或xml参数

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;


public class HttpPostTest {
public static String testPost(String urlStr,String pageIndex) { 
        try { 
            URL url = new URL(urlStr); 
            URLConnection con = url.openConnection(); 
            con.setDoOutput(true); 
            con.setRequestProperty("Cache-Control", "max-age=5");
    con.setRequestProperty("ApplicationContext","");
    con.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8");
    con.setRequestProperty("Accept-Encoding", "");
    con.setRequestProperty("Connection", "Keep-Alive");
    con.setRequestProperty("Content-Type", "application/json; charset=utf-8");
    con.setRequestProperty("Host", "iustore.iuoooo.com");
    con.setRequestProperty("User-Agent", "okhttp/3.2.0");
            OutputStreamWriter out = new OutputStreamWriter(con 
                    .getOutputStream());     
            //String xmlInfo = getXmlInfo(); 
            //System.out.println("urlStr=" + urlStr); 
            //System.out.println("xmlInfo=" + xmlInfo); 
            out.write("json字符串");
            //out.write(new String(xmlInfo.getBytes("ISO-8859-1"))); 
            out.flush(); 
            out.close(); 
            BufferedReader br = new BufferedReader(new InputStreamReader(con 
                    .getInputStream())); 
            String line = ""; 
            for (line = br.readLine(); line != null; line = br.readLine()) { 
                //System.out.println(line);
            return line;
            } 
          
        } catch (MalformedURLException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        }
return null; 
    }
//xml_canshu
    private String getXmlInfo() { 
        StringBuilder sb = new StringBuilder(); 
        sb.append("<videoSend>"); 
        sb.append("    <header>"); 
        sb.append("        <sid>1</sid>"); 
        sb.append("        <type>service</type>"); 
        sb.append("    </header>"); 
        sb.append("    <service name=\"videoSend\">"); 
        sb.append("        <fromNum>xx</fromNum>"); 
        sb.append("           <toNum>xx</toNum>"); 
        sb.append("        <videoPath>xx</videoPath>"); 
        sb.append("        <chargeNumber>xx</chargeNumber>"); 
        sb.append("    </service>"); 
        sb.append("</videoSend>"); 
        return sb.toString(); 
    } 
 

}