java中发送http请求的方法
package org.jeecgframework.test.demo; import java.io.BufferedReader; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.net.ConnectException; import java.net.HttpURLConnection; import java.net.Socket; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import java.util.SortedMap; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; public class HttpClientHelper { /** * @Description:使用HttpURLConnection发送post请求 * @author:liuyc * @time:2016年5月17日 下午3:26:07 */ public static String sendPost(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> e : params.entrySet()) { sbParams.append(e.getKey()); sbParams.append("="); sbParams.append(e.getValue()); sbParams.append("&"); } } HttpURLConnection con = null; OutputStreamWriter osw = null; BufferedReader br = null; // 发送请求 try { URL url = new URL(urlParam); con = (HttpURLConnection) url.openConnection(); con.setRequestMethod("POST"); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); if (sbParams != null && sbParams.length() > 0) { osw = new OutputStreamWriter(con.getOutputStream(), charset); osw.write(sbParams.substring(0, sbParams.length() - 1)); osw.flush(); } // 读取返回内容 resultBuffer = new StringBuffer(); int contentLength = Integer.parseInt(con.getHeaderField("Content-Length")); if (contentLength > 0) { br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset)); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } } catch (Exception e) { throw new RuntimeException(e); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { osw = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } } return resultBuffer.toString(); } /** * @Description:使用HttpClient发送post请求 * @author:liuyc * @time:2016年5月17日 下午3:28:23 */ public static String httpClientPost(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; HttpClient client = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(urlParam); // 构建请求参数 List<NameValuePair> list = new ArrayList<NameValuePair>(); Iterator<Entry<String, Object>> iterator = params.entrySet().iterator(); while (iterator.hasNext()) { Entry<String, Object> elem = iterator.next(); list.add(new BasicNameValuePair(elem.getKey(), String.valueOf(elem.getValue()))); } BufferedReader br = null; try { if (list.size() > 0) { UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset); httpPost.setEntity(entity); } HttpResponse response = client.execute(httpPost); // 读取服务器响应数据 resultBuffer = new StringBuffer(); br = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } } } return resultBuffer.toString(); } //请求xml组装 public static String getRequestXml(SortedMap<String,Object> parameters){ StringBuffer sb = new StringBuffer(); sb.append("<xml>"); Set es = parameters.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String key = (String)entry.getKey(); String value = (String)entry.getValue(); if ("attach".equalsIgnoreCase(key)||"body".equalsIgnoreCase(key)||"sign".equalsIgnoreCase(key)) { sb.append("<"+key+">"+"<![CDATA["+value+"]]></"+key+">"); }else { sb.append("<"+key+">"+value+"</"+key+">"); } } sb.append("</xml>"); return sb.toString(); } //生成签名 public static String createSign(String characterEncoding,SortedMap<String,Object> parameters){ StringBuffer sb = new StringBuffer(); Set es = parameters.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String k = (String)entry.getKey(); Object v = entry.getValue(); if(null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) { sb.append(k + "=" + v + "&"); } } sb.append("key=" + ""); String sign = MD5.md5(sb.toString()).toUpperCase(); return sign; } //请求方法 public static String httpsRequest(String requestUrl, String requestMethod, String data) { try { URL url = new URL(requestUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); // 设置请求方式（GET/POST） conn.setRequestMethod(requestMethod); conn.setRequestProperty("content-type", "application/json"); // conn.setRequestProperty("content-type", "text/xml;charset=utf-8"); // 当outputStr不为null时向输出流写数据 if (null != data) { OutputStream outputStream = conn.getOutputStream(); // 注意编码格式 outputStream.write(data.getBytes("UTF-8")); outputStream.close(); } // 从输入流读取返回内容 InputStream inputStream = conn.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); String str = null; StringBuffer buffer = new StringBuffer(); while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } // 释放资源 bufferedReader.close(); inputStreamReader.close(); inputStream.close(); inputStream = null; conn.disconnect(); return buffer.toString(); } catch (ConnectException ce) { System.out.println("连接超时：{}"+ ce); } catch (Exception e) { System.out.println("https请求异常：{}"+ e); } return null; } public static void main(String[] args) { String requestUrl,requestMethod,outputStr; requestUrl="（此处填写你要请求的url地址）"; requestMethod="POST"; outputStr="<xml>"+ "<appid><![CDATA[wx2421b1c4370ec43b]]></appid>"+ "<mch_id><![CDATA[10000100]]></mch_id>"+ "<device_info><![CDATA[1]]></device_info>"+ "<nonce_str><![CDATA[5d2b6c2a8db53831f7eda20af46e531c]]></nonce_str>"+ "<sign><![CDATA[6245928B869A39BC75A421200A74002E]]></sign>"+ "<result_code><![CDATA[SUCCESS]]></result_code>"+ "<return_code><![CDATA[SUCCESS]]></return_code>"+ "<err_code><![CDATA[1004400740201409030005092168]]></err_code>"+ "<err_code_des><![CDATA[1004400740201409030005092168]]></err_code_des>"+ "<openid><![CDATA[oUpF8uMEb4qRXf22hE3X68TekukE]]></openid>"+ "<is_subscribe><![CDATA[Y]]></is_subscribe>"+ "<trade_type><![CDATA[JSAPI]]></trade_type>"+ "<bank_type><![CDATA[CFT]]></bank_type>"+ "<total_fee><![CDATA[1]]></total_fee>"+ "<fee_type><![CDATA[CNY]]></fee_type>"+ "<cash_fee><![CDATA[168]]></cash_fee>"+ "<cash_fee_type><![CDATA[1004400740201409030005092168]]></cash_fee_type>"+ "<transaction_id><![CDATA[1004400740201409030005092168]]></transaction_id>"+ "<out_trade_no><![CDATA[137999992017032919767558710]]></out_trade_no>"+ "<time_end><![CDATA[20140903131540]]></time_end>"+ "<trade_state><![CDATA[1]]></trade_state>"+ "<attach><![CDATA[支付测试]]></attach>"+ "</xml>"; //错误的json请求 // String data = "[{\"id\":1,\"name\":\"o2o_V3.0新版发布\",\"content\":\"o2o_V3.0新版发布\",\"time\":\"2015-05-11 03:12:51\"}]"; String data = "{\"id\":1,\"name\":\"o2o_V3.0新版发布\",\"content\":\"o2o_V3.0新版发布\",\"time\":\"2015-05-11 03:12:51\"}"; String xml=httpsRequest(requestUrl,requestMethod,data); System.out.println(xml); //System.out.println(outputStr); } }
请求的时候只需要调用这个类中的httpsRequest方法，requestUrl代表的就是请求的url地址，requestMethod代表的是以Post或者Get方法请求方式，data就是请求的参数；
