小编Wil*_*mes的帖子

我是 Python 新手，所以遇到了一些麻烦。我正在尝试构建一个工具，通过代理将数据发布到外部服务器。我可以正常工作，但问题是我不知道如何捕获代理连接错误并打印其他内容。我写的代码是：

import requests
from bs4 import BeautifulSoup

headers = {
    "User-Agent": "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11",
    "Content-Type": "application/json"
}
proxies = { 
    "https": "https://244.324.324.32:8081",
}
data = {"test": "test"}
r = requests.post("https://example.com/page", proxies=proxies, json=data, headers=headers)
print(r.text)

当代理已死（未连接/工作）或类似内容时，如何打印，例如“代理连接错误”。这是我第一次使用 python，所以我遇到了麻烦。

谢谢你

我在 JAVA 上使用带有 hibernate 的 H2 数据库，但遇到了一个奇怪的错误。我创建了抽象存储库来管理基本的 CRUD 操作。

我得到的异常是这样的：

java.lang.IllegalStateException: org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl@d20d74a is closed
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.errorIfClosed(AbstractLogicalConnectionImplementor.java:37)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:135)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getConnectionForTransactionManagement(LogicalConnectionManagedImpl.java:254)
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.rollback(AbstractLogicalConnectionImplementor.java:116)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.rollback(JdbcResourceLocalTransactionCoordinatorImpl.java:294)
at org.hibernate.engine.transaction.internal.TransactionImpl.rollback(TransactionImpl.java:139)
at repositories.AbstractRepository.save(AbstractRepository.java:32)
at services.ResultService.saveResult(ResultService.java:76)
at services.API.WebRequestService.run(WebRequestService.java:124)
at services.API.ThreadService.run(ThreadService.java:67)

AbstractRepository保存方法：

public <T> T save(T t) {
    Transaction transaction = null;
    try (Session session = HibernateConfig.getSessionFactory().openSession()) {
        transaction = session.beginTransaction();
        Serializable entityId = session.save(t);
        transaction.commit();

        T createdEntity = (T) session.get(t.getClass(), entityId);
        return createdEntity;

    } catch (Exception e) {
        if (transaction != null) {
            transaction.rollback();
        }
        e.printStackTrace(); …