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我们通常做Java后台接口，是让前端访问的，让前端获取数据或者做增删改查，但是有时候，我们做的Java接口是让其他系统的Java后台调用的，让其他系统从我们这个系统获取数据或者做业务，这样就要用到HttpURLConnection。本文写得急，仅贴出样例供参考。
（1）先写一个简单的，只发送请求，不附带参数。思路是打开一个URL连接，设置请求的方式，获取输入流，从流里面解析
出数据。
@RestController
public class TestUrlController {
@RequestMapping("testUrl")
public void testUrl(){
try {
String str = "https://www.baidu.com/";
URL url = new URL(str);
//得到connection对象。
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//设置请求方式
connection.setRequestMethod("GET");
//连接
connection.connect();
//得到响应码
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
//得到响应流
InputStream inputStream = connection.getInputStream();
//获取响应
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null){
System.out.println(line);
}
reader.close();
//该干的都干完了,记得把连接断了
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}（2）用xml 传送参数
@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", "手机号不能为空！");
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";//主账号
String Balance = "30";//指定充值的时长
String Type = "9";//套餐
String AccessType = "99";//接入类型
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"; //业务类型
String PackageID = "1011";//服务端配置
//充值交易流水号，唯一标识一笔充值，字母+数字的字符串，
// 格式：6位接入设备标识(AAAAAA)+年月日时分秒（Yyyymmddhhmiss）+六位流水号（xxxxxx）
String Transid = "hfxdgy" + simpleDateFormat3.format(newDate) + (int) ((Math.random() * 9 + 1) * 100000);
String xmlString = ""
+ ""
+ ""
+ ""
+ ""
+ "" +
"" +
"" + UserID + "" +
"" + PIN + "" +
"" +
"" + Sessionid + "" +
"" + Subscriber_id + "" +
"" + Balance + "" +
"" + Type + "" +
"" + AccessType + "" +
"" + Expirydate + "" +
"" + Rechargetime + "" +
"" + ServiceType + "" +
"" + PackageID + "" +
"" + Transid + "" +
"" +
"" +
"";
System.out.println("$$$$$$$$$$$$ 发送报文是：");
System.out.println(xmlString);
byte[] xmlData = xmlString.getBytes();
String urlStr = "http://XX.X.XXX.XX:6000";//接口
//获得到位置服务的链接
URL url = new URL(urlStr);
URLConnection urlCon = url.openConnection();//打开XX连接
urlCon.setDoOutput(true);
urlCon.setDoInput(true);
urlCon.setUseCaches(false);
urlCon.setConnectTimeout(5000);
urlCon.setReadTimeout(5000);
//将xml数据发送到位置服务
urlCon.setRequestProperty("Content-Type", "text/xml");
urlCon.setRequestProperty("Content-length", String.valueOf(xmlData.length));
DataOutputStream printout = new DataOutputStream(urlCon.getOutputStream());
printout.write(xmlData);//把报文发送到XX的接口
printout.flush();
printout.close();
input = new DataInputStream(urlCon.getInputStream());//获取XX接口的返回信息
byte[] rResult;
out = new java.io.ByteArrayOutputStream();
byte[] bufferByte = new byte[256];
int l = -1;
int downloadSize = 0;
while ((l = input.read(bufferByte)) > -1) {
downloadSize += l;
out.write(bufferByte, 0, l);
out.flush();
}
rResult = out.toByteArray();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document d = db.parse(new ByteArrayInputStream(rResult));
System.out.println("$$$$$$$$$$$ 返回报文是：");
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", "服务器繁忙！");
return resultMap;
} finally {
try {
out.close();
input.close();
} catch (Exception ex) {
}
}
}
}（3）用form提交参数
@RequestMapping(value="openMemberRights/")
@ResponseBody
public Map openMemberRights(
HttpServletResponse response,
@RequestParam(value="phone", required=true) String phone,
@RequestParam(value="productId", required=true) String productId
){
String urlString = "https://XXXXXXXXXXXXXXXX";
Map resultMap = new HashMap();
InputStream inputStream = null;
OutputStream outputStream = null;
try {
//获取位置服务的地址
URL url = new URL(urlString);
//打开连接
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);
//设置请求方式
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
connection.connect();
//电话号码加密
String mobile = AesUtil.encrypt(phone,APPSCRET.substring(0,16));
//唯一随机数
String once = new SimpleDateFormat("ssSSSS").format(new Date()) + String.valueOf(Math.random()).substring(2, 8);
//参数签名
HashMap 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);
// 表单参数与get形式一样,拼接form参数
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();
// 输入参数
outputStream = connection.getOutputStream();
outputStream.write(bypes);
//从输入流中读取数据
inputStream = connection.getInputStream();
String result = new String(StreamTool.readInputStream(inputStream), "UTF-8");
//关闭连接
connection.disconnect();
System.out.println("返回报文是：");
System.out.println(JsonUtil.getBeanMap(result));
return JsonUtil.getBeanMap(result);
}
catch (Exception e) {
e.printStackTrace();
resultMap.put("error_msg","服务器错误!");
return resultMap;
}
finally {
try {
inputStream.close();
outputStream.close();
}
catch (Exception e) {
}
}
}
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