最原始的http请求

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private String request3(String requestMessage,String txUrl) throws Exception{
log.info(txUrl);
URL url = new URL(txUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setDoInput(true);
connection.setDoOutput(true);
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream(), "utf-8"));
PrintWriter pw = new PrintWriter(bw, true);
// 发起请求
pw.println(requestMessage);
log.info("请求xml:"+requestMessage);
log.info("响应代码:"+connection.getResponseCode());
if(200 == (connection.getResponseCode())){
InputStream is = connection.getInputStream();
String result = inputStreamToString(is);
pw.close();
bw.close();
log.info("请求成功:"+result.toString());
return result.toString();
}else{
InputStream is = connection.getErrorStream();
//通过getErrorStream了解错误的详情，因为错误详情也以XML格式返回，因此也可以用JDOM来获取。
String result = inputStreamToString(is);
pw.close();
bw.close();
throw new Exception("响应代码" + connection.getResponseMessage() + "。错误原因是:" + result);
}
}
/**
* 读取数据
* @param is
* @return
* @throws Exception
*/
private String inputStreamToString(InputStream is) throws Exception{
BufferedReader br = new BufferedReader(new InputStreamReader(is,"utf-8"));
String temp = null;
StringBuffer result = new StringBuffer();
while ((temp = br.readLine()) != null) {
result.append(temp);
}
br.close();
is.close();
return result.toString();
}