DruidPlugin druidPlugin = new DruidPlugin(jdbcUrl, user, password);
// remarks=true设置可以获取column remarks信息
// useInformationSchema=true设置可以获取tables remarks信息
druidPlugin.setConnectionProperties("useInformationSchema=true;remarks=true");
druidPlugin.start();
return druidPlugin.getDataSource();

import javax.sql.DataSource;
import com.jfinal.kit.StrKit;
import com.jfinal.plugin.activerecord.generator.ColumnMeta;
import com.jfinal.plugin.activerecord.generator.TableMeta;

public class MyDataDictionaryGenerator extends com.jfinal.plugin.activerecord.generator.DataDictionaryGenerator {

	public DataDictionaryGenerator(DataSource dataSource, String dataDictionaryOutputDir) {
		super(dataSource, dataDictionaryOutputDir);
	}

	/**
	 * 重写掉生成换行
	 */
	@Override
	protected String genSeparateLine(TableMeta tm) {
		return "";
	}

	protected void generateTable(TableMeta tableMeta, StringBuilder ret) {
		ret.append("Table: ").append(tableMeta.name);
		if (StrKit.notBlank(tableMeta.remarks)) {
			ret.append("（").append(clearBlank(tableMeta.remarks)).append("）");
		}
		ret.append("\n");
		
		String sparateLine = genSeparateLine(tableMeta);
		ret.append(sparateLine);
		genTableHead(tableMeta, ret);
		ret.append(sparateLine);
		for (ColumnMeta columnMeta : tableMeta.columnMetas) {
			genColumn(tableMeta, columnMeta, ret);
		}
		ret.append(sparateLine);
		ret.append("\n");
	}

	/**
	 * 表头
	 */
	@Override
	protected void genTableHead(TableMeta tm, StringBuilder ret) {
		ret.append('\n').append('|');
		genCell(tm.colNameMaxLen, " ", "Field", " ", "|",  ret);
		genCell(tm.colTypeMaxLen, " ", "Type", " ", "|", ret);
		genCell("Null".length(), " ", "Null",  " ","|", ret);
		genCell("Key".length(), " ", "Key",  " ","|", ret);
		genCell(tm.colDefaultValueMaxLen, " ", "Default", " ", "|", ret);
		genCell("Remarks".length(), " ", "Remarks", " ", "|", ret);
		ret.append('\n').append('|');
		genCell(tm.colNameMaxLen, " ", "-", "-", "|",  ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		genCell(tm.colTypeMaxLen, " ", "-", "-", "|", ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		genCell("Null".length(), " ", "-",  "-","|", ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		genCell("Key".length(), " ", "-",  "-","|", ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		genCell(tm.colDefaultValueMaxLen, " ", "-", "-", "|", ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		genCell("Remarks".length(), " ", "-", "-", "|", ret);
		ret.replace(ret.length() - 2, ret.length() - 1, " ");
		ret.append('\n');
	}

	/**
	 * 列
	 */
	@Override
	protected void genColumn(TableMeta tableMeta, ColumnMeta columnMeta, StringBuilder ret) {
		ret.append('|');
		genCell(tableMeta.colNameMaxLen, " ", columnMeta.name, " ", "|",  ret);
		genCell(tableMeta.colTypeMaxLen, " ", columnMeta.type, " ", "|", ret);
		genCell("Null".length(), " ", columnMeta.isNullable, " ", "|", ret);
		genCell("Key".length(), " ", columnMeta.isPrimaryKey, " ", "|", ret);
		genCell(tableMeta.colDefaultValueMaxLen, " ", columnMeta.defaultValue, " ", "|", ret);
		genCell("Remarks".length(), " ", clearBlank(columnMeta.remarks), " ", "|", ret);
		ret.append("\n");
	}
	
	/**
	 * 清除注释中的空白符
	 */
	private String clearBlank(String str) {
		return str.replaceAll("[ |\t|\n]+", "");
	}
}

// 创建生成器
Generator generator = new Generator(dataSource, baseModelPackageName, baseModelOutputDir, modelPackageName, modelOutputDir);
DataDictionaryGenerator dg = new MyDataDictionaryGenerator(dataSource, modelOutputDir);
dg.setDataDictionaryFileName("数据字典.md");
generator.setDataDictionaryGenerator(dg);