工具类: http请求工具类
package com.jarvis.base.util; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.URL; /** * * * @Title: HttpHelper.java * @Package com.jarvis.base.util * @Description:http请求工具类 * @author Jack * @date 2017年9月2日 下午3:34:49 * @version V1.0 */ public class HttpHelper { private static final int DEFAULT_INITIAL_BUFFER_SIZE = 4 * 1024; // 4 kB private HttpHelper() { } /** * 返回对应URL地址的内容,注意,只返回正常响应(状态响应代码为200)的内容 * * @param urlPath * 需要获取内容的URL地址 * @return 获取的内容字节数组 */ public static byte[] getURLContent(String urlPath) { HttpURLConnection conn = null; InputStream inStream = null; byte[] buffer = null; try { URL url = new URL(urlPath); HttpURLConnection.setFollowRedirects(false); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setDoOutput(true); conn.setUseCaches(false); conn.setDefaultUseCaches(false); conn.setConnectTimeout(10000); // 10秒 conn.setReadTimeout(60000); // 60秒 conn.connect(); int repCode = conn.getResponseCode(); if (repCode == 200) { inStream = conn.getInputStream(); int contentLength = conn.getContentLength(); buffer = getResponseBody(inStream, contentLength); } } catch (Exception ex) { ex.printStackTrace(); System.err.println("获取内容失败"); } finally { try { if (inStream != null) { inStream.close(); } if (conn != null) { conn.disconnect(); } } catch (Exception ex) { ex.printStackTrace(); System.err.println("关闭连接失败"); } } return buffer; } /** * 描述:获取BODY部分的字节数组 时间:2010-9-7 下午03:16:46 * * @param instream * @param contentLength * @return * @throws Exception */ private static byte[] getResponseBody(InputStream instream, int contentLength) throws Exception { if (contentLength == -1) { System.out.println("Going to buffer response body of large or unknown size. "); } ByteArrayOutputStream outstream = new ByteArrayOutputStream( contentLength > 0 ? (int) contentLength : DEFAULT_INITIAL_BUFFER_SIZE); byte[] buffer = new byte[4096]; int len; while ((len = instream.read(buffer)) > 0) { outstream.write(buffer, 0, len); } outstream.close(); return outstream.toByteArray(); } @SuppressWarnings("unused") private static void readFixedLenToBuffer(InputStream inStream, byte[] buffer) throws Exception { int count = 0; int remainLength = buffer.length; int bufLength = buffer.length; int readLength = 0; do { count = inStream.read(buffer, readLength, remainLength); if (count == -1) // 已经到达末尾 { if (readLength != bufLength) // 若实际读取的数据和需要读取的数据不匹配,则报错 { throw new Exception("读取数据出错,不正确的数据结束"); } } readLength += count; if (readLength == bufLength) // 已经读取完,则返回 { return; } remainLength = bufLength - readLength; } while (true); } /** * 返回对应URL地址的内容,注意,只返回正常响应(状态响应代码为200)的内容 * * @param urlPath * 需要获取内空的URL地址 * @param charset * 字符集编码方式 * @return 获取的内容字串 */ public static String getURLContent(String urlPath, String charset) { BufferedReader reader = null; HttpURLConnection conn = null; StringBuffer buffer = new StringBuffer(); try { URL url = new URL(urlPath); HttpURLConnection.setFollowRedirects(false); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setDoOutput(true); conn.setUseCaches(false); conn.setDefaultUseCaches(false); conn.setConnectTimeout(10000); // 10秒 conn.setReadTimeout(60000); // 60秒 conn.connect(); int repCode = conn.getResponseCode(); if (repCode == 200) { int count = 0; char[] chBuffer = new char[1024]; BufferedReader input = new BufferedReader(new InputStreamReader(conn.getInputStream(), charset)); while ((count = input.read(chBuffer)) != -1) { buffer.append(chBuffer, 0, count); } } } catch (Exception ex) { ex.printStackTrace(); System.err.println("获取内容失败"); } finally { try { if (reader != null) { reader.close(); } if (conn != null) { conn.disconnect(); } } catch (Exception ex) { ex.printStackTrace(); System.err.println("关闭连接失败"); } } return buffer.toString(); } public static String getURLContent(String urlPath, String requestData, String charset) { BufferedReader reader = null; HttpURLConnection conn = null; StringBuffer buffer = new StringBuffer(); OutputStreamWriter out = null; try { URL url = new URL(urlPath); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setUseCaches(false); conn.setDefaultUseCaches(false); conn.setConnectTimeout(10000); // 10秒 conn.setReadTimeout(60000); // 60秒 out = new OutputStreamWriter(conn.getOutputStream(), charset); out.write(requestData); out.flush(); int repCode = conn.getResponseCode(); if (repCode == 200) { int count = 0; char[] chBuffer = new char[1024]; BufferedReader input = new BufferedReader(new InputStreamReader(conn.getInputStream(), charset)); while ((count = input.read(chBuffer)) != -1) { buffer.append(chBuffer, 0, count); } } } catch (Exception ex) { ex.printStackTrace(); System.err.println("获取内容失败"); } finally { try { if (out != null) { out.close(); } if (reader != null) { reader.close(); } if (conn != null) { conn.disconnect(); } } catch (Exception ex) { ex.printStackTrace(); System.err.println("关闭连接失败"); } } return buffer.toString(); } }