org.postgresql.util.PSQLException: ������������: ��������� "runoobdba" ���������

java连接PostgreSql

各版本地址：https://mvnrepository.com/artifact/postgresql/postgresql/<!-- https://mvnrepository.com/artifact/postgresql/postgresql -->

<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.1-901.jdbc4</version>
</dependency>



写个jdbc，进行连接，运行报错。

org.postgresql.util.PSQLException: ������������: ��������� "runoobdba" ���������
at org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages(ConnectionFactoryImpl.java:469)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:112)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)
at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:125)
at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30)
at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22)
at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:30)
at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
at org.postgresql.Driver.makeConnection(Driver.java:393)
at org.postgresql.Driver.connect(Driver.java:267)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at aa.ConnUtil.getConn(ConnUtil.java:18)
at aa.TestMain.main(TestMain.java:16)
Exception in thread "main" java.lang.NullPointerException
at aa.TestMain.main(TestMain.java:22)

原因：

url地址后面的数据库名称写错了。字符串书写的时候一定要注意再注意。