java如何实现http之post请求将参数放入到body中并发送呢？

body放入post请求

实现思路:
    1.打印urlConnection连接
	2.生成一个new OutputStreamWriter(connection.getOutputStream(),"UTF-8")对象
	3.向对象中写入params
采用以上方法,即可向指定url的body中请求参数

import java.net.HttpURLConnection;
import java.net.URL;
//方法，参数params,{"image":"str_base"}
public static String httpPost(String serverURL, String params) {
	HttpURLConnection connection = null;
	BufferedReader reader = null;
	InputStream is = null;
	OutputStreamWriter writer = null;
	try{
		StringBuffer sbf = new StringBuffer();
		String strRead = null;
		URL url = new URL(serverURL);
		connection = (HttpURLConnection)url.openConnection();
		connection.setRequestMethod("POST");//请求post方式
		connection.setDoInput(true);
		connection.setDoOutput(true);
		//header内的的参数在这里set
		//connection.setRequestProperty("key", "value");
		connection.setRequestProperty("Content-Type", "application/json;charset=\"UTF-8\"");
		connection.connect();
		writer = new OutputStreamWriter(connection.getOutputStream(),"UTF-8");
		//body参数放这里
		writer.write(params);
		writer.flush();
		is = connection.getInputStream();
		reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
		while ((strRead = reader.readLine()) != null) {
			sbf.append(strRead);
			sbf.append("\r\n");
		}
		reader.close();
		is.close();
		writer.close();
		connection.disconnect();
		String results = sbf.toString();
		System.out.println("str_base>>>:"+results);
		return results;
	}catch (IOException e){
		e.printStackTrace();
		return "";
	}finally {
		try {
			if(connection != null){
				connection.disconnect();
			}
			if(reader != null){
				reader.close();
			}
			if(is != null){
				is.close();
			}
			if(writer != null){
				writer.close();
			}
		}catch (Exception e){
			e.printStackTrace();
		}
	}
}