urlConn.setRequestProperty("Content-Type","text/plain; charset=utf-8"); 

urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); 

request.getParameter(参数名); 

    // 接收请求数据
    BufferedReader reader = request.getReader();
    char[] buf = new char[512];
    int len = 0;
    StringBuffer contentBuffer = new StringBuffer();
    while ((len = reader.read(buf)) != -1) {
      contentBuffer.append(buf, 0, len);
    }
        String content = contentBuffer.toString();
        
        if(content == null){
            content = "";
        }

public class UrlConnection {
 @SuppressWarnings("finally") 
   public static Boolean response(String url,String content) {
  String line     = "";
  String message    = "";
  String returnData  = "";
  Boolean postState   = false;
  BufferedReader bufferedReader = null;
  try {
   URL urlObject = new URL(url);
   HttpURLConnection urlConn = (HttpURLConnection) urlObject.openConnection();
   urlConn.setDoOutput(true);
   /*设定禁用缓存*/
   urlConn.setRequestProperty("Pragma:", "no-cache");
   urlConn.setRequestProperty("Cache-Control", "no-cache");
   /*维持长连接*/
   urlConn.setRequestProperty("Connection", "Keep-Alive");
   /*设置字符集*/
   urlConn.setRequestProperty("Charset", "UTF-8");
   /*设定输出格式为json*/
   urlConn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
   /*设置使用POST的方式发送*/
   urlConn.setRequestMethod("POST");
   /*设置不使用缓存*/
   urlConn.setUseCaches(false);
   /*设置容许输出*/
   urlConn.setDoOutput(true);
   /*设置容许输入*/
   urlConn.setDoInput(true);
   urlConn.connect();
   OutputStreamWriter outStreamWriter = new OutputStreamWriter(urlConn.getOutputStream(),"UTF-8");
   outStreamWriter.write(content);
   outStreamWriter.flush();
   outStreamWriter.close();
   /*若post失败*/
   if((urlConn.getResponseCode() != 200)){
    returnData = "{\"jsonStrStatus\":0,\"processResults\":[]}";
    message = "发送POST失败！"+ "code="+urlConn.getResponseCode() + "," + "失败消息："+ urlConn.getResponseMessage();
    // 定义BufferedReader输入流来读取URL的响应 
    InputStream errorStream = urlConn.getErrorStream();
    if(errorStream != null) 
            {
     InputStreamReader inputStreamReader = new InputStreamReader(errorStream,"utf-8");
     bufferedReader = new BufferedReader(inputStreamReader);
     while ((line = bufferedReader.readLine()) != null) {
      message += line;
     }
     inputStreamReader.close();
    }
    errorStream.close();
    System.out.println("发送失败！错误信息为："+message);
   } else{
    /*发送成功返回发送成功状态*/
    postState = true;
    // 定义BufferedReader输入流来读取URL的响应 
    InputStream inputStream = urlConn.getInputStream();
    InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"utf-8");
    bufferedReader = new BufferedReader(inputStreamReader);
    while ((line = bufferedReader.readLine()) != null) {
     message += line;
    }
    returnData = message;
    inputStream.close();
    inputStreamReader.close();
    System.out.println("发送POST成功！返回内容为：" + message);
   }
  }
  catch (Exception e) {
   e.printStackTrace();
  }
  finally{
   try {
    if (bufferedReader != null) {
     bufferedReader.close();
    }
   }
   catch (IOException ex) {
    ex.printStackTrace();
   }
   return postState;
  }
 }
 /*读取request数据*/
 public static String getRequestData(HttpServletRequest request) throws IOException{
  BufferedReader reader = request.getReader();
  char[] buf = new char[512];
  int len = 0;
  StringBuffer contentBuffer = new StringBuffer();
  while ((len = reader.read(buf)) != -1) {
   contentBuffer.append(buf, 0, len);
  }
  String content = contentBuffer.toString();
  if(content == null){
   content = "";
  }
  return content;
 }
}