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GEThttpurlconnection.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