JDBC如何从数据库中打印所有表名?

下文笔者讲述java代码如何从数据库中打印所有表名的方法分享,如下所示

实现思路:
    借助Connection对象的getMetaData()方法
	即可输出所有的数据表名称

例:
打印PostgreSQL数据库,数据库名等于postgres的所有数据表的示例分享

一、引入依赖
pom.xml

<dependencies>
	<dependency>
		<groupId>org.postgresql</groupId>
		<artifactId>postgresql</artifactId>
		<version>42.2.5</version>
	</dependency>
</dependencies>


//打印数据表信息
package com.java265.jdbc;
 
import java.sql.*;
public class PrintAllTables {
    public static void main(String[] argv) {
        System.out.println("PostgreSQL JDBC Connection Testing ~");
        try {
            Class.forName("org.postgresql.Driver");
        } catch (ClassNotFoundException e) {
            System.err.println("Unable to find the PostgreSQL JDBC Driver!");
            e.printStackTrace();
            return;
        }
 
        // default database: postgres
        // JDK 7, auto close connection with try-with-resources
        try (Connection connection =
                     DriverManager.getConnection("jdbc:postgresql://127.0.0.1:5432/postgres",
                             "postgres", "password")) {
 
            DatabaseMetaData metaData = connection.getMetaData();
            try (ResultSet rs = metaData.getTables(null, null, "%", null)) {
                ResultSetMetaData rsMeta = rs.getMetaData();
                int columnCount = rsMeta.getColumnCount();
 
                while (rs.next()) {
                    System.out.println("\n----------");
                    System.out.println(rs.getString("TABLE_NAME"));
                    System.out.println("----------");
 
                    for (int i = 1; i <= columnCount; i++) {
                        String columnName = rsMeta.getColumnName(i);
                        System.out.format("%s:%s\n", columnName, rs.getString(i));
                    }
                }
            }
 
        } catch (SQLException e) {
            System.err.println("Something went wrong!");
            e.printStackTrace();
            return;
        }
 
    } 
}