http json请求工具类

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 远程请求工具类, 10秒的链接超时时间,2秒的读取超时时间
 * 
 *
 */
public class RMIUtil {
	private static Logger logger = LoggerFactory.getLogger(RMIUtil.class);

	public static String readALl(String url) {
		try {
			URL url_req = new URL(url);
			logger.info("发起请求:" + url_req);
			URLConnection con = url_req.openConnection();
			con.setReadTimeout(2000);
			con.setConnectTimeout(10000);
			InputStream is = con.getInputStream();
			StringBuilder sb = new StringBuilder();
			Scanner input = new Scanner(is, "utf-8");
			String line = "";
			while (input.hasNextLine()) {
				line = input.nextLine();
				sb.append(line);
			}
			input.close();
			String rs = sb.toString();
			return rs;
		} catch (Exception e) {
			logger.error("请求失败！失败原因:" + e.getMessage());
		}
		return "{}";
	}