书籍是人类的终生朋友，有时候要检索个书籍啥的，一般我们都会去图书馆，但是如果自己开发一款应用，比如网站，app之类的就显然不能这么搞了，一般情况下很多网站都不允许数据外流的，这种情况最好就是调用专门的提供数据的接口，接着笔者就拿php语言为例来实现图书信息检索这个功能，直接上代码：
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><?php/** * @author * @copyright 2019 */ header("content-type:text/html;charset=utf-8"); //设置编码 //配置您申请的appKey和openId$app_key = "***";$open_id = "***";/**$url 请求地址$params 请求参数$ispost 请求方法*/function http_curl($url,$params=false,$ispost=false){ $httpInfo = array(); $ch = curl_init(); curl_setopt( $ch, CURLOPT_HTTP_VERSION , CURL_HTTP_VERSION_1_1 ); curl_setopt( $ch, CURLOPT_USERAGENT , "xiaocongjisuan"); curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT , 60 ); curl_setopt( $ch, CURLOPT_TIMEOUT , 60); curl_setopt( $ch, CURLOPT_RETURNTRANSFER , true ); if( $ispost ) { curl_setopt( $ch , CURLOPT_POST , true ); curl_setopt( $ch , CURLOPT_POSTFIELDS , $params ); curl_setopt( $ch , CURLOPT_URL , $url ); } else { if($params){ curl_setopt( $ch , CURLOPT_URL , $url.'?'.$params ); }else{ curl_setopt( $ch , CURLOPT_URL , $url); } } $response = curl_exec( $ch ); if ($response === FALSE) { //echo "cURL Error: " . curl_error($ch); return false; } $httpCode = curl_getinfo( $ch , CURLINFO_HTTP_CODE ); $httpInfo = array_merge( $httpInfo , curl_getinfo( $ch ) ); curl_close( $ch ); return $response;}function main(){ global $app_key; global $open_id; $domain="http://api.xiaocongjisuan.com/"; $servlet="data/bookresource/get"; $method="get"; $url=$domain."".$servlet; $params['appKey']=$app_key; $params['openId']=$open_id; //变动部分 $params["q"]="历史"; $params["field"]="name"; $params["currentPage"]=1; $params["pageSize"]=10; $params["order"]="up"; $params["sortField"]="pageNum"; //编码转换 foreach ($params as $key=>$value) { $params[$key]=mb_convert_encoding($value, "UTF-8", "GBK"); } $paramstring = http_build_query($params); $content = http_curl($url,$paramstring,true); return $content;}echo main();?>当然java语言也可以实现，例子如下
package com.xiaocongjisuan.module.example;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 Application { 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appKey和openId public static final String APP_KEY ="yours"; public static final String OPEN_ID ="yours"; //将map型转为请求参数型 public static String urlEncode(Map<String,Object> params) { if(params==null){return "";}; StringBuilder sb = new StringBuilder(); for (Map.Entry<String,Object> i : params.entrySet()) { try { sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } String r=sb.toString(); if(r.endsWith("&")){ r = r.substring(0,r.length()-1); } return r; } /** * * @param requestUrl 请求地址 * @param params 请求参数 * @param method 请求方法 * @return 请求结果 * @throws Exception */ public static String requestContent(String requestUrl, Map<String,Object> params,String method) throws Exception { HttpURLConnection conn = null; BufferedReader reader = null; String rs = null; try { //组装请求链接 StringBuffer sb = new StringBuffer(); if(method!=null&&method.equalsIgnoreCase("get")){ requestUrl = requestUrl+"?"+urlEncode(params); } //默认get URL url = new URL(requestUrl); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); if(method!=null&&method.equalsIgnoreCase("post")){ conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setDoInput(true); } //参数配置 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.equalsIgnoreCase("post")) { try { DataOutputStream out = new DataOutputStream(conn.getOutputStream()); out.writeBytes(urlEncode(params)); } catch (Exception e) { e.printStackTrace(); } } //读取数据 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; } public static void main(String[] args) throws Exception{ String domain="http://api.xiaocongjisuan.com/"; String servlet="data/bookresource/get"; String method="get"; String requestUrl=domain+servlet; Map<String,Object> params=new HashMap<String,Object>(); params.put("appKey",APP_KEY); params.put("openId",OPEN_ID); //变动部分 params.put("q","历史"); params.put("field","name"); params.put("currentPage",1); params.put("pageSize",10); params.put("order","up"); params.put("sortField","pageNum"); String result=requestContent(requestUrl,params,method); System.out.println(result); }}其他语言的实现方式可以参看这篇帖子