Spring JDBC 无法连接到 postgres 数据库，但普通 JDBC 可以连接

Question

我正在尝试使用 postgresql 设置数据库连接。我使用的是普通香草 JDBC ，并且能够成功连接到数据库。

但是，当我使用 JdbcTemplate 提供相同的连接参数时，我无法连接。

请看我的代码和配置:

<bean  name="dataSource" id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.postgresql.Driver" />
    <property name="url" value="jdbc:postgresql://localhost:5342/testdbnew" /> 
    <property name="username" value="admin1" />
    <property name="password" value="admin1" />
</bean>    

<bean  id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource" />
</bean> 

<bean name="announcementNewsDAO" id="announcementNewsDAO" class="test.dao.AnnouncementNewsDAOImpl">
</bean>

这是我通过代码访问的方式：

首先，我正在创建一个 class 来实现 ApplicationContextAware。然后，我从那个引用调用 jdbcTemplate 对象。

public class ApplicationContextProvider implements ApplicationContextAware {

private static ApplicationContext context;

 public static ApplicationContext getApplicationContext() {
    return context;
}

@Override
public void setApplicationContext(ApplicationContext ac)
        throws BeansException {
    context = ac;
    System.out.println("Context initialized...");
    JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");
    System.out.println("jdbcTemplate initialized..");

}

}

和

这是 AnnouncementDAOImpl 的 class：

public class AnnouncementNewsDAOImpl implements AnnouncementNewsDAO {


/**
 * JDBCTemplate object for accessing database
 */
@Autowired
private  JdbcTemplate jdbcTemplate ;


@Override
public void insertAnnouncementNews(AnnouncementNews news) {

    String insertQuery = "<db query for insert>";
    try {

        Object[] args = new Object[]{Integer.valueOf(news.getSlno()), news.getStakeholder_code(), news.getInfo_type(), news.getAnnouncement_news(),null,null};


        int result = jdbcTemplate.update(insertQuery, args);

        if(result!=0){
            System.out.println("Announcement news inserted for the serial number : "+news.getSlno());
        }else{
            System.err.println("Could not insert announcement news for the serial number : "+news.getSlno());
        }


    } catch (ParseException pe) {
        System.err.println("Exception occurred while parsing date : "+pe.getMessage());
    }
}

我收到错误消息：

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.postgresql.util.PSQLException: Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:628) at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:907) at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:968) at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:978) at Caused by: org.postgresql.util.PSQLException: Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:207)

Answer 1

端口有错字？

<property name="url" value="jdbc:postgresql://localhost:5342/iitkgpdbnew" />

默认的 PostgreSQL 端口是 5432。当然除非你把它改成 5342:)

Spring JDBC 无法连接到 postgres 数据库，但普通 JDBC 可以连接

Spring JDBC can not connect to postgres database , but plain JDBC is able to connect

spring

postgresql

spring-jdbc