从一个action地址获取信息

get方法

String url_str ="http://127.0.0.1:8400/lxyyProduct/getProductUserNeedUpdate.action?ts="+maxTs;
        URL url = new URL(url_str);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.connect();
        int result = connection.getResponseCode();
        
        if (result == 200)//如果等于200算连接成功
        {
            InputStream in;
            in = connection.getInputStream(); 
            BufferedReader breader = new BufferedReader(new InputStreamReader(in , "UTF-8")); 
            String str=breader.readLine();
        }

post方法

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUrlUtil {

    /**
     * 通过HttpURLConnection模拟post表单提交
     * 
     * @param path
     * @param params 例如"name=zhangsan&age=21"
     * @return
     * @throws Exception
     */
    public static String sendPostRequestByForm(String path, String params) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");// 提交模式
        // conn.setConnectTimeout(10000);//连接超时 单位毫秒
        // conn.setReadTimeout(2000);//读取超时 单位毫秒
        conn.setDoOutput(true);// 是否输入参数
        byte[] bypes = params.toString().getBytes();
        conn.getOutputStream().write(bypes);// 输入参数
        InputStream inStream=conn.getInputStream();
        return readInputStream(inStream);
    }
    
    /**
     * 从输入流中读取数据
     * @param inStream
     * @return
     * @throws Exception
     */
    public static String 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();
                
        String res = new String(data,"UTF-8");
        
        return res;
    }
    
    public static void main(String[] args) throws UnsupportedEncodingException, Exception
    {
        String path="http://www.kd185.com/ems.php";
        String params="id=1&df=323";
                
        System.out.println(sendPostRequestByForm(path,params));
    }
}