java呼叫api介面,maven匯入jar包
阿新 • • 發佈:2019-02-02
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);
}