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java呼叫api介面,maven匯入jar包

    maven需要引入的jar包
    <!--  httpclient -->
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
            </dependency>
        <dependency>   
           <groupId>javax.servlet</groupId>   
           <artifactId>servlet-api</artifactId>   
           <version>2.5
</version> <scope>provided</scope> </dependency> <!-- json包 --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> </dependency> 前端傳送資料,後臺根據電話號碼查歸屬地: http://localhost:8881/a?a=18650498888
{"msg":"success","result":{"city":"福州市","cityCode":"0591","mobileNumber":"1865049","operator":"福建聯通GSM卡","province":"福建","zipCode":"350000"},"retCode":"200"} java程式碼如下: @RequestMapping(value="/a",method=RequestMethod.GET) //接收ajax 傳過來的電話號碼phone public String urldata(@RequestParam String a) { //查詢電話號碼介面
System.out.println(a); //返回號碼詳細資訊 //---------程式碼開始 String result = ""; BufferedReader in = null; try { String urlNameString = "http://apicloud.mob.com/v1/mobile/address/query?phone=" + a + "&key=520520test"; URL realUrl = new URL(urlNameString); // 開啟和URL之間的連線 URLConnection connection = realUrl.openConnection(); // 設定通用的請求屬性 connection.setRequestProperty("accept", "*/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 建立實際的連線 connection.connect(); // 獲取所有響應頭欄位 Map<String, List<String>> map = connection.getHeaderFields(); // 遍歷所有的響應頭欄位 for (String key : map.keySet()) { System.out.println(key + "--->" + map.get(key)); } // 定義 BufferedReader輸入流來讀取URL的響應 in = new BufferedReader(new InputStreamReader( connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("傳送GET請求出現異常!" + e); e.printStackTrace(); } // 使用finally塊來關閉輸入流 finally { try { if (in != null) { in.close(); } } catch (Exception e2) { e2.printStackTrace(); } } //-----程式碼結束 return result; } //---- /** * 向指定 URL 傳送POST方法的請求 * * @param url * 傳送請求的 URL * @param param * 請求引數,請求引數應該是 name1=value1&name2=value2 的形式。 * @return 所代表遠端資源的響應結果 */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // 開啟和URL之間的連線 URLConnection conn = realUrl.openConnection(); // 設定通用的請求屬性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 傳送POST請求必須設定如下兩行 conn.setDoOutput(true); conn.setDoInput(true); // 獲取URLConnection物件對應的輸出流 out = new PrintWriter(conn.getOutputStream()); // 傳送請求引數 out.print(param); // flush輸出流的緩衝 out.flush(); // 定義BufferedReader輸入流來讀取URL的響應 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("傳送 POST 請求出現異常!"+e); e.printStackTrace(); } //使用finally塊來關閉輸出流、輸入流 finally{ try{ if(out!=null){ out.close(); } if(in!=null){ in.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return result; } } 呼叫方法:參考 public static void main(String[] args) { //傳送 GET 請求 String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456"); System.out.println(s); //傳送 POST 請求 String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456"); System.out.println(sr); }