第二讲 获取HttpURLConnection获取json

package com.cat.util;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class TestHttpContion
{
	private static String u;

	@SuppressWarnings("finally")
	public static String sendHttpProperty(String address)
	{
		StringBuffer returnStr = new StringBuffer();
		u = address;
		URL url = null;
		HttpURLConnection httpurlconnection = null;

		try
		{
			url = new URL(u);
			httpurlconnection = (HttpURLConnection) url.openConnection();
			httpurlconnection.setDoOutput(true);
			// 设置是否从httpUrlConnection读入，默认情况下是true;
			httpurlconnection.setDoInput(true);
			// Post 请求不能使用缓存
			httpurlconnection.setInstanceFollowRedirects(true);
			httpurlconnection.setUseCaches(false);
			httpurlconnection.setRequestProperty("connection", "keep-alive");
			// 设定传送的内容类型是可序列化的java对象
			// (如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException)
			httpurlconnection.setRequestProperty("Content-type",
					"application/x-java-serialized-object");
			httpurlconnection.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			// 设定请求的方法为"POST"，默认是GET
			httpurlconnection.setRequestMethod("POST");
			// 连接，从上述第2条中url.openConnection()至此的配置必须要在connect之前完成，
			httpurlconnection.setInstanceFollowRedirects(false);
			httpurlconnection.setConnectTimeout(2000);
			httpurlconnection.setReadTimeout(1000);
			httpurlconnection.setRequestProperty("Charsert", "UTF-8");
			httpurlconnection.connect();
			DataOutputStream out = new DataOutputStream(
					httpurlconnection.getOutputStream());
			out.writeBytes("");
			out.flush();
			out.close();

			DataInputStream reader = new DataInputStream(
					httpurlconnection.getInputStream());
			byte[] buffer = new byte[4096];
			int count = 0;
			while ((count = reader.read(buffer)) > 0)
			{
				String result = new String(buffer, 0, count);
				returnStr.append(result);
			}
			reader.close();

		} catch (Exception e)
		{
			e.printStackTrace();
		} finally
		{
			if (httpurlconnection != null)
			{
				httpurlconnection.disconnect();
			}
			return returnStr.toString();
		}
	}
}

 

这是一个用HttpURLConnection获取数据 并返回字符所获得字符串