我們通常做Java後臺接口，是讓前端訪問的，讓前端獲取數據或者做增刪改查，但是有時候，我們做的Java接口是讓其他系統的Java後臺調用的，讓其他系統從我們這個系統獲取數據或者做業務，這樣就要用到HttpURLConnection。本文寫得急，僅貼出樣例供參考。
（1）先寫一個簡單的，只發送請求，不附帶參數。思路是打開一個URL連接，設置請求的方式，獲取輸入流，從流裏面解析
出數據。
@RestController
public class TestUrlController {
@RequestMapping("testUrl")
public void testUrl(){
try {
String str = "https://www.baidu.com/";
URL url = new URL(str);
//得到connection對象。
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//設置請求方式
connection.setRequestMethod("GET");
//連接
connection.connect();
//得到響應碼
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
//得到響應流
InputStream inputStream = connection.getInputStream();
//獲取響應
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null){
System.out.println(line);
}
reader.close();
//該乾的都幹完了,記得把連接斷了
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}@Controller
@RequestMapping("/aa/")
public class HefeixinController {
private static Logger logger = Logger.getLogger(HefeixinController.class);
@RequestMapping(value = "RechargeRequest")
@ResponseBody
public HashMap RechargeRequest(RechargeVO rechargeVO, HttpServletResponse response) {
HashMap resultMap = new HashMap();
String phone = rechargeVO.getPhone();
if ((phone == null) || (phone.trim() == "")) {
resultMap.put("Sessionid", "20170815112314125427");
resultMap.put("Retncode", "-2");
resultMap.put("msg", "手機號不能爲空！");
return resultMap;
}
DataInputStream input = null;
java.io.ByteArrayOutputStream out = null;
try {
String UserID = "Bigturntable";
String PIN = "Bigturntable";
String Sessionid = "20170815112314125427";
String Subscriber_id = "86" + phone + "@ims.mnc000.mcc460.3gppnetwork.org";//主賬號
String Balance = "30";//指定充值的時長
String Type = "9";//套餐
String AccessType = "99";//接入類型
String Expirydate = "20180131";//本次充值的套餐截止日期
//String Rechargetime="20180123";
Date newDate = new Date();
SimpleDateFormat simpleDateFormat2 = new SimpleDateFormat("yyyyMMdd");//日期格式
SimpleDateFormat simpleDateFormat3 = new SimpleDateFormat("yyyyMMddHHmmss");//日期格式
String Rechargetime = simpleDateFormat2.format(newDate);//格式化日期
String ServiceType = "2"; //業務類型
String PackageID = "1011";//服務端配置
//充值交易流水號，唯一標識一筆充值，字母+數字的字符串，
// 格式：6位接入設備標識(AAAAAA)+年月日時分秒（Yyyymmddhhmiss）+六位流水號（xxxxxx）
String Transid = "hfxdgy" + simpleDateFormat3.format(newDate) + (int) ((Math.random() * 9 + 1) * 100000);
String xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
+ "<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:comm3=\"http://www.chinatelecom.com.cn/schema/ctcc/common/v2_1\" xmlns:ns2=\"http://tempuri.org/ns2.xsd\">"
+ "<SOAP-ENV:Header>"
+ "</SOAP-ENV:Header>"
+ "<SOAP-ENV:Body>"
+ "<ns2:RechargeRequest>" +
"<AuthValue>" +
"<UserID>" + UserID + "</UserID>" +
"<PIN>" + PIN + "</PIN>" +
"</AuthValue>" +
"<Sessionid>" + Sessionid + "</Sessionid>" +
"<Subscriber_id>" + Subscriber_id + "</Subscriber_id>" +
"<Balance>" + Balance + "</Balance>" +
"<Type>" + Type + "</Type>" +
"<AccessType>" + AccessType + "</AccessType>" +
"<Expirydate>" + Expirydate + "</Expirydate>" +
"<Rechargetime>" + Rechargetime + "</Rechargetime>" +
"<ServiceType>" + ServiceType + "</ServiceType>" +
"<PackageID>" + PackageID + "</PackageID>" +
"<Transid>" + Transid + "</Transid>" +
"</ns2:RechargeRequest>" +
"</SOAP-ENV:Body>" +
"</SOAP-ENV:Envelope>";
System.out.println("$$$$$$$$$$$$ 發送報文是：");
System.out.println(xmlString);
byte[] xmlData = xmlString.getBytes();
String urlStr = "http://XX.X.XXX.XX:6000";//接口
//獲得到位置服務的鏈接
URL url = new URL(urlStr);
URLConnection urlCon = url.openConnection();//打開XX連接
urlCon.setDoOutput(true);
urlCon.setDoInput(true);
urlCon.setUseCaches(false);
urlCon.setConnectTimeout(5000);
urlCon.setReadTimeout(5000);
//將xml數據發送到位置服務
urlCon.setRequestProperty("Content-Type", "text/xml");
urlCon.setRequestProperty("Content-length", String.valueOf(xmlData.length));
DataOutputStream printout = new DataOutputStream(urlCon.getOutputStream());
printout.write(xmlData);//把報文發送到XX的接口
printout.flush();
printout.close();
input = new DataInputStream(urlCon.getInputStream());//獲取XX接口的返回信息
byte[] rResult;
out = new java.io.ByteArrayOutputStream();
byte[] bufferByte = new byte[256];
int l = -1;
int downloadSize = 0;
while ((l = input.read(bufferByte)) > -1) {
downloadSize += l;
out.write(bufferByte, 0, l);
out.flush();
}
rResult = out.toByteArray();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document d = db.parse(new ByteArrayInputStream(rResult));
System.out.println("$$$$$$$$$$$ 返回報文是：");
System.out.println(toStringFromDoc(d));
String SessionidStr = d.getElementsByTagName("Sessionid").item(0).getFirstChild().getNodeValue();
String RetncodeStr = d.getElementsByTagName("Retncode").item(0).getFirstChild().getNodeValue();
resultMap.put("Sessionid", SessionidStr);
resultMap.put("Retncode", RetncodeStr);
return resultMap;
} catch (Exception e) {
e.printStackTrace();
resultMap.put("Sessionid", "20170815112314125427");
resultMap.put("Retncode", "-1");
resultMap.put("msg", "服務器繁忙！");
return resultMap;
} finally {
try {
out.close();
input.close();
} catch (Exception ex) {
}
}
}
}@RequestMapping(value="openMemberRights/")
@ResponseBody
public Map<String, Object> openMemberRights(
HttpServletResponse response,
@RequestParam(value="phone", required=true) String phone,
@RequestParam(value="productId", required=true) String productId
){
String urlString = "https://XXXXXXXXXXXXXXXX";
Map<String, Object> resultMap = new HashMap();
InputStream inputStream = null;
OutputStream outputStream = null;
try {
//獲取位置服務的地址
URL url = new URL(urlString);
//打開連接
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setConnectTimeout(CONNECT_TIME_OUT);
connection.setReadTimeout(CONNECT_TIME_OUT);
//設置請求方式
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
connection.connect();
//電話號碼加密
String mobile = AesUtil.encrypt(phone,APPSCRET.substring(0,16));
//唯一隨機數
String once = new SimpleDateFormat("ssSSSS").format(new Date()) + String.valueOf(Math.random()).substring(2, 8);
//參數簽名
HashMap<String,String> hashMap = new HashMap<>();
hashMap.put("app_key",APP_KEY);
hashMap.put("version", "1.0");
hashMap.put("sdk_from", "java");
hashMap.put("channel", CHANNEL);
hashMap.put("once", once);
hashMap.put("productId",productId);
hashMap.put("mobile", mobile);
String signatur = SignUtil.getNornmalSignature(hashMap,APPSCRET);
// 表單參數與get形式一樣,拼接form參數
StringBuffer params = new StringBuffer();
params.append("app_key").append("=").append(APP_KEY).append("&")
.append("version").append("=").append("1.0").append("&")
.append("sdk_from").append("=").append("java").append("&")
.append("channel").append("=").append(CHANNEL).append("&")
.append("once").append("=").append(once).append("&")
.append("productId").append("=").append(productId).append("&")
.append("mobile").append("=").append(mobile).append("&")
.append("signature").append("=").append(signatur);
byte[] bypes = params.toString().getBytes();
// 輸入參數
outputStream = connection.getOutputStream();
outputStream.write(bypes);
//從輸入流中讀取數據
inputStream = connection.getInputStream();
String result = new String(StreamTool.readInputStream(inputStream), "UTF-8");
//關閉連接
connection.disconnect();
System.out.println("返回報文是：");
System.out.println(JsonUtil.getBeanMap(result));
return JsonUtil.getBeanMap(result);
}
catch (Exception e) {
e.printStackTrace();
resultMap.put("error_msg","服務器錯誤!");
return resultMap;
}
finally {
try {
inputStream.close();
outputStream.close();
}
catch (Exception e) {
}
}
}