Java利用原始HttpURLConnection发送http请求数据小结

Posted 2020-10-12 .Oneday

1，在post请求下，写输出应该在读取之后，否则会抛出异常。

即操作OutputStream对象应该在InputStreamReader之前。

2.conn.getResponseCode()获取返回状态码最好放在读写完成之后，否则也会抛出异常。这里不知道是否是该方法会导致连接关闭，待验证。

下面贴出工具类代码

其中GET请求直接在requestUrl里面拼接，POST请求通过outputStr传入。

/**
* 发送https请求
* @param requestUrl 请求地址
* @param requestMethod 请求方式（GET、POST）
* @param outputStr 提交的数据
* @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
*/
public static WxApiResult httpsRequest(String requestUrl, String requestMethod, String outputStr) {
WxApiResult message = new WxApiResult();
try {
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
SSLSocketFactory ssf = sslContext.getSocketFactory();

URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setSSLSocketFactory(ssf);

conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod(requestMethod);

if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}

InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
if(conn.getResponseCode()==conn.HTTP_OK){
message.setCode(0);
message.setContent(buffer.toString());
}else{
message.setCode(-1);
message.setContent("获取返回状态不对,返回状态为:"+conn.getResponseCode());
}

// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();

} catch (ConnectException ce) {
log.error("连接超时：{}", ce);
message.setCode(-1);
message.setContent(ce.getMessage());
} catch (Exception e) {
log.error("https请求异常：{}", e);
message.setCode(-1);
message.setContent(e.getMessage());
}
return message;
}