java网络适配器无法建立连接

1 周，4 日 Questions & Answers 1258

以下是连接到数据库时的连接字符串：

public static void createConnection() throws Exception {
    System.out.println("-------- Oracle JDBC Connection Testing ------");

            try {

                Class.forName("oracle.jdbc.driver.OracleDriver");

            } catch (ClassNotFoundException e) {

                System.out.println("Where is your Oracle JDBC Driver?");
                e.printStackTrace();
                return;

            }

            System.out.println("Oracle JDBC Driver Registered!");

            Connection connection = null;

            try {

                connection = DriverManager.getConnection(
                        "jdbc:oracle:thin:@localhost:1521:brdqa", "STATICDATA_APP",
                        "password");

            } catch (SQLException e) {

                System.out.println("Connection Failed! Check output console");
                e.printStackTrace();
                return;

            }

运行此代码时，我得到以下异常：

java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at com.markit.scripts.ConnectMRD.createConnection(ConnectMRD.java:32)
    at com.markit.scripts.ConnectMRD.main(ConnectMRD.java:54)

我在谷歌上搜索了很多，发现只有这个连接字符串存在问题。字符串中的“brdqa”是我的数据库名，“STATICDATA_APP”是我的用户名。我可以手动访问数据库。请建议

共 (1) 个答案

# 1 楼答案
此错误表示驱动程序无法将套接字连接到端口1521上的主机“localhost”

您可以再次检查同一连接字符串是否适用于sqlplus：
```
sqlplus "STATICDATA_APP/password@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SID=brdqa)))"
```
侦听器通常不支持“localhost”作为主机名。您是否尝试过使用本地IP地址“127.0.0.1”
```
"jdbc:oracle:thin:@127.0.0.1:1521:brdqa"
```

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java网络适配器无法建立连接

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