JavaHTTP协议实现

package com.http.post; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.HashMap; import java.util.Map; public class postUtils { private static String PATH = "http://192.168.222.1:1231/loginas.ashx"; private static URL url; public postUtils() { } static { try { url = new URL(PATH); } catch (Exception e) { e.printStackTrace(); } } /** * 通过给定的请求参数和编码格式，获取服务器返回的数据 * @param params 请求参数 * @param encode 编码格式 * @return 获得的字符串 */ public static String sendPostMessage(Map<String, String> params, String encode) { StringBuffer buffer = new StringBuffer(); if (params != null && !params.isEmpty()) { for (Map.Entry<String, String> entry : params.entrySet()) { try { buffer.append(entry.getKey()) .append("=") .append(URLEncoder.encode(entry.getValue(), encode)) .append("&"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } buffer.deleteCharAt(buffer.length() - 1); System.out.println(buffer.toString()); try { HttpURLConnection urlConnection = (HttpURLConnection) url .openConnection(); urlConnection.setConnectTimeout(3000); //设置允许输入输出 urlConnection.setDoInput(true); urlConnection.setDoOutput(true); byte[] mydata = buffer.toString().getBytes(); //设置请求报文头，设定请求数据类型 urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); //设置请求数据长度 urlConnection.setRequestProperty("Content-Length", String.valueOf(mydata.length)); //设置POST方式请求数据 urlConnection.setRequestMethod("POST"); OutputStream outputStream = urlConnection.getOutputStream(); outputStream.write(mydata); int responseCode = urlConnection.getResponseCode(); if (responseCode == 200) { return changeInputStream(urlConnection.getInputStream(), encode); } } catch (IOException e) { e.printStackTrace(); } } return ""; } /** * 把服务端返回的输入流转换成字符串格式 * @param inputStream 服务器返回的输入流 * @param encode 编码格式 * @return 解析后的字符串 */ private static String changeInputStream(InputStream inputStream, String encode) { ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); byte[] data = new byte[1024]; int len = 0; String result=""; if (inputStream != null) { try { while ((len = inputStream.read(data)) != -1) { outputStream.write(data,0,len); } result=new String(outputStream.toByteArray(),encode); } catch (IOException e) { e.printStackTrace(); } } return result; } /** * @param args */ public static void main(String[] args) { //通过Map设置请求字符串。 Map<String, String> params = new HashMap<String, String>(); params.put("username", "admin"); params.put("password", "123"); String result=sendPostMessage(params, "utf-8"); System.out.println(result); } }