Java访问Https接口

java访问https接口、发送数据、接收数据

1.建立连接

URL url = new URL(urlStr);
//创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = {new MyX509TrustManager ()}; 
//SSLContext.getInstance(arg0, arg1)，注意arg0要与要访问的https接口网站所用的TLS/SSL的版本一致，否则在打开连接时会报握手失败的错            
SSLContext sslContext =SSLContext.getInstance("TLSv1.2","SunJSSE"); 
sslContext.init(null, tm, new java.security.SecureRandom()); 
//从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
//创建HttpsURLConnection对象，并设置其SSLSocketFactory对象
HttpsURLConnection urlCon = (HttpsURLConnection)url.openConnection();
urlCon.setSSLSocketFactory(ssf);

2.向https接口发送数据

String str = "xxx";//你要发送的数据
byte[] reqData = str.getBytes();
urlCon.setDoOutput(true);
urlCon.setDoInput(true);
urlCon.setUseCaches(false);
urlCon.setRequestProperty("Content-Type", "text/xml;charset=utf-8");
urlCon.setRequestProperty("Content-length", String.valueOf(reqData.length)); 
DataOutputStream printout = new DataOutputStream(urlCon.getOutputStream()); 
printout.write(reqData); 
printout.flush(); 
printout.close();

3.接收https接口返回的数据

DataInputStream input = null;
java.io.ByteArrayOutputStream out = null;
input = new DataInputStream(urlCon.getInputStream());
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();
}
String resData = out.toString();