Java提交Http Get和Post请求的通用方法

以往我们提交Http Get请求和Post请求时，一般会根据请求方式分别编写方法进行调用，以下方法则将两种请求的调用方式进行了整合，这样以后调用请求的时候就不需要考虑请求方式是Get还是Post，通通只要调用此方法就行了。代码如下：

public static ServiceResult sendRequest(String url, String obj, Map<String, String> headers, RequestMethod requestMethod, ContentType contentType) throws IOException {
    //返回对象，包含businessObject（返回数据）、success（是否成功返回）、
    //message（返回信息，一般是错误信息）、responseCode（返回码）等属性
    ServiceResult result = new ServiceResult();
        //Get提交时直接在url中拼接参数，obj是已经拼接好的参数字符串
    if (requestMethod.toString().equals("GET") && obj.length() > 0) {
        url = url + "?" + obj;
    }
    URL requestUrl = new URL(url);
    HttpURLConnection connection=null;
    StringBuffer sbBuffer = null;
    try {
        //打开连接，设置连接参数
        connection = (HttpURLConnection) requestUrl.openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setRequestMethod(requestMethod.toString());
        //设置内容类型，默认为json
        if (contentType == null) {
            connection.setRequestProperty("Content-Type", "application/json");
        } else {
            connection.setRequestProperty("Content-Type",contentType);
        }
        connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
        connection.setRequestProperty("Accept", "*/*");
        //设置请求头，请求头信息存在map中，因此需要循环遍历出来进行设置
        if (headers != null) {
            for (Iterator iter = headers.keySet().iterator(); iter.hasNext();){
                String name = (String) iter.next();
                String value = String.valueOf(headers.get(name));
                connection.setRequestProperty(name, value);
            }
        }
        connection.setReadTimeout(2000000);
        connection.setConnectTimeout(2000000);
        connection.connect();
        //如果是post请求，则需要将参数写入到输出流中
        OutputStream outputStream = connection.getOutputStream();
        outputStream.write(obj.toString().getBytes());
        outputStream.flush();
        outputStream.close();
        //获取返回结果码
        int code = connection.getResponseCode();
        if (code == 200) {//返回成功的结果码
            //从输入流中读取返回信息
            InputStreamReader inputStreamReader = new InputStreamReader(connection.getInputStream());
            BufferedReader reader = new BufferedReader(inputStreamReader);
            sbBuffer = new StringBuffer("");
            String lines;
            while ((lines = reader.readLine()) != null) {
                lines = new String(lines.getBytes(), "utf-8");
                sbBuffer.append(lines);
            }
            reader.close();
            inputStreamReader.close();
            //将返回信息设置到返回对象中
            result.setResponseCode(200);
            result.setIsSuccess(true);
            result.setBusinessObject(sbBuffer.toString());
        } else {//返回失败
            //将返回失败信息设置到返回对象中
            result.setBusinessObject(connection.getResponseMessage());
            result.setMessage(connection.getResponseMessage());
            result.setResponseCode(connection.getResponseCode());
            result.setIsSuccess(false);
        }
        //断开连接
        connection.disconnect();
    } catch (IOException e) {
        e.printStackTrace();
        //将异常信息设置到返回对象中
        result.setIsSuccess(false);
        result.setMessage(e.getMessage());
        result.setResponseCode(0);
    }
    return result;
}