Java编程接口调用的作用及代码分享

package com.shz.Test;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class GupiaoZi {
	private static String Gopiao(String id,int pageIndex) {
		String result="";
		try {
			URL url=new URL("地址");
			String key="官网申请的key";
			HttpURLConnection conn=(HttpURLConnection) url.openConnection();
			conn.setRequestMethod("GET");
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setConnectTimeout(5000);
			conn.setReadTimeout(5000);
			conn.setUseCaches(false);
			conn.connect();
			DataOutputStream out=new DataOutputStream(conn.getOutputStream());
			//拼接起来
			String connect="id="+id+"&key="+key+"&pageIndex="+pageIndex;
			System.out.println(connect);
			out.writeBytes(connect);
			out.flush();
			out.close();
			BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
			StringBuffer buffer=new StringBuffer();
			String str="";
			while((str=br.readLine())!=null){
				buffer.append(str);
			}
			br.close();
			result=buffer.toString();
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	public static void main(String[] args) {
		String id="5687";
		int pageIndex=1;
		String str=Gopiao(id,pageIndex);
		System.out.println(str);
	}
}