在java中利用POST方式编写一个https接口，具体方法如下：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
public class HttpRequest {
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化 
TrustManager[] tm = { new MyX509TrustManager() }; 
SSLContext sslContext = SSLContext.getInstance("SSL"); 
sslContext.init(null, tm, new java.security.SecureRandom()); 
// 从上述SSLContext对象中得到SSLSocketFactory对象 
SSLSocketFactory ssf = sslContext.getSocketFactory(); 
// 打开和URL之间的连接
URL realUrl = new URL(url);
HttpsURLConnection conn = (HttpsURLConnection) realUrl.openConnection();
conn.setSSLSocketFactory(ssf); 
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("content-Type", "application/json");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
System.out.println("-----result-----"+result);
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！"+e);
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException ex){
ex.printStackTrace();
}
}
return result;
} 
}