通过HttpURLConnection模拟post表单提交

 URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");// 提交模式
        conn.setDoOutput(true);// 是否输入参数

        StringBuffer params = new StringBuffer();
        // 表单参数与get形式一样
        params.append("user").append("=").append("111").append("&")
              .append("password").append("=").append("111");
        byte[] bypes = params.toString().getBytes();
        conn.getOutputStream().write(bypes);// 输入参数
        InputStream inStream=conn.getInputStream();
        String mes = new String(StreamTool.readInputStream(inStream), "gbk");
        JSONObject jsonToken = JSONObject.fromObject(mes);
        System.out.println(jsonToken.get("token"));
        System.out.println(StreamTool.readInputStream(inStream));

 读取输入流数据

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTool {
    /**
     * 从输入流中读取数据
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] readInputStream(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len = inStream.read(buffer)) !=-1 ){
            outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();//网页的二进制数据
        outStream.close();
        inStream.close();
        return data;
    }
}