Java 代码实现POST/GET请求
方式一
package com.cyb.util; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; 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 Util { public static final String DEF_CHATSET = "UTF-8"; public static final int DEF_CONN_TIMEOUT = 30000; public static final int DEF_READ_TIMEOUT = 30000; public static String userAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36"; //配置您申请的KEY public static final String APPKEY ="*************************"; /** * * @param strUrl 请求地址 * @param params 请求参数 * @param method 请求方法 * @return 网络请求字符串 * @throws Exception */ public static String net(String strUrl, Map params,String method) throws Exception { HttpURLConnection conn = null; BufferedReader reader = null; String rs = null; try { StringBuffer sb = new StringBuffer(); if(method==null || method.equals("GET")){ strUrl = strUrl+"?"+urlencode(params); } URL url = new URL(strUrl); conn = (HttpURLConnection) url.openConnection(); if(method==null || method.equals("GET")){ conn.setRequestMethod("GET"); }else{ conn.setRequestMethod("POST"); conn.setDoOutput(true); } conn.setRequestProperty("User-agent", userAgent); conn.setUseCaches(false); conn.setConnectTimeout(DEF_CONN_TIMEOUT); conn.setReadTimeout(DEF_READ_TIMEOUT); conn.setInstanceFollowRedirects(false); conn.connect(); if (params!= null && method.equals("POST")) { try { DataOutputStream out = new DataOutputStream(conn.getOutputStream()); out.writeBytes(urlencode(params)); } catch (Exception e) { // TODO: handle exception } } InputStream is = conn.getInputStream(); reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET)); String strRead = null; while ((strRead = reader.readLine()) != null) { sb.append(strRead); } rs = sb.toString(); } catch (IOException e) { e.printStackTrace(); } finally { if (reader != null) { reader.close(); } if (conn != null) { conn.disconnect(); } } return rs; } //将map型转为请求参数型 public static String urlencode(Map<String,Object>data) { StringBuilder sb = new StringBuilder(); for (Map.Entry i : data.entrySet()) { try { sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } return sb.toString(); } }
方式二
/** * 向指定的地址发送GET请求 * @param url * @return */ public static String get(String url) { try { URL urlObjUrl=new URL(url); //打开链接 URLConnection connection =urlObjUrl.openConnection(); InputStream iStream=connection.getInputStream(); byte[] b=new byte[1024]; int len; StringBuilder sb=new StringBuilder(); while ((len=iStream.read(b))!=-1) { sb.append(new String(b,0,len)); } return sb.toString(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }
方式三
/** * 向指定的地址发送一个POST请求 * @param url 请求地址 * @param params 请求数据 * @return */ public static String post(String url,String params) { try { URL urlObjUrl=new URL(url); //打开链接 URLConnection connection =urlObjUrl.openConnection(); //要发送数据出去,必须要设置为可发送数据状态 connection.setDoOutput(true); OutputStream os=connection.getOutputStream(); //写出数据 os.write(params.getBytes()); os.close(); //获取输入流,读取数据 InputStream iStream=connection.getInputStream(); byte[] b=new byte[1024]; int len; StringBuilder sb=new StringBuilder(); while ((len=iStream.read(b))!=-1) { sb.append(new String(b,0,len)); } return sb.toString(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }