写好了https请求案例后，测试报如下错误：
18:26:46.071 [main] DEBUG org.apache.http.impl.conn.DefaultManagedHttpClientConnection - http-outgoing-0: Shutdown connection
18:26:46.071 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Connection discarded
18:26:46.072 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection released: [id: 0][route: {s}->https://api.weixin.qq.com:443][total kept alive: 0; route allocated: 0 of 2; total allocated: 0 of 20]
18:26:46.072 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection manager is shutting down
18:26:46.072 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection manager shut down
Exception in thread "main" javax.net.ssl.SSLHandshakeException: Could not generate secret
at sun.security.ssl.DHCrypt.getAgreedSecret(Unknown Source)
at sun.security.ssl.ClientHandshaker.serverHelloDone(Unknown Source)
at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
at sun.security.ssl.Handshaker.processLoop(Unknown Source)
at sun.security.ssl.Handshaker.process_record(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at com.welink.oil.utils.HttpUtils.doGet(HttpUtils.java:126)
at com.welink.oil.utils.HttpUtils.main(HttpUtils.java:161)
Caused by: java.security.NoSuchAlgorithmException: Algorithm DiffieHellman not available
at javax.crypto.KeyAgreement.getInstance(KeyAgreement.java:184)
at sun.security.ssl.JsseJce.getKeyAgreement(Unknown Source)
... 23 more
网上百度了很多方法，都不管用，最后看到了这样一份博客（原址见文末），启发了自己，解决方法如下：
在eclipse的preferences->java->installed->add
把自己的安装的jre目录和jdk目录都添加进来，如下图
选中jdk为默认
然后修改项目中的build path
右键选中项目->properties->Libraries 修改为刚才添加的jdk
然后在运行项目，请求https就没有问题了，可以正常返回
参考博文地址：https://blog.csdn.net/depinhu/article/details/84355784
