import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

import java.io.IOException;


public class AlmanacUtil{

    public AlmanacUtil( ){

    }
    public  void getdata (String url) {
        String data = null;
        org.apache.commons.httpclient.HttpClient client = new HttpClient();
        GetMethod getMethod= new GetMethod(url);
        getMethod.setRequestHeader("User_Agent","Mozilla/5.0(Windows NT 6.1;Win64;x64;rv:39.0) Gecko/20100101 Firefox/39.0");
        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler());//系统默认的恢复策略
        try{
            int statusCode=client.executeMethod(getMethod);
            if(statusCode!= HttpStatus.SC_OK){
                System.out.println("Method failed:"+getMethod.getStatusLine());
            }
            byte[] responseBody = getMethod.getResponseBody();
            data = new String(responseBody);
            System.out.println(data);

        }catch(HttpException e){
            System.out.println("Please check your provided http address!");
            data="";
            e.printStackTrace();

        } catch (IOException e) {
            data="";
            e.printStackTrace();
        }finally {

            getMethod.releaseConnection();

        }
    }

    public static void main(String[] args) {
        AlmanacUtil almanacUtil = new AlmanacUtil();
        almanacUtil.getdata("https://campus.alibaba.com/traineePositions.htm?refno=12067");

    }
}

所需要的包