详解Java Web模板代码生成器的设计与实现

mvn archetype:generate 
-DgroupId=com.zju 
-DartifactId=JavaWebCodeGenerator 
-DarchetypeArtifactId=maven-archetype-webapp 
-DinteractiveMode=false 
-DarchetypeCatalog=internal

//Java SQL 驱动所在路径(暂未使用)
private static final String CLASS_PATH_ENTRY = "class.path.entry";
//Java 驱动类型(暂未使用)
private static final String DRIVER_CLASS = "driver.class";
//数据库地址
private static final String CONNECTION_URL = "connection.url";
//数据库用户名
private static final String USER_ID = "user.id";
//数据库密码
private static final String USER_PASSWORD = "user.password";
//模型生成地址
private static final String JAVA_MODEL_PACKAGE = "java.model.package";
//SQL生成地址
private static final String SQL_MAPPING_PACKAGE = "sql.mapping.package";
//项目地址
private static final String PROJECT = "project";
//数据表名
private static final String TABLE_NAME = "table.name";
//模型名称
private static final String DOMAIN_OBJECT_NAME = "domain.object.name";

Class.forName(configuration.getDriverClass());
//获取数据库连接
Connection connection = DriverManager.getConnection(configuration.getConnectionURL(), 
configuration.getUserId(), 
configuration.getPassword());
DatabaseMetaData databaseMetaData = connection.getMetaData();
//获取表结构信息
ResultSet rs = databaseMetaData.getColumns("", "", configuration.getTableName(), "%");

/**
* @param configuration 封装的配置信息
* @param columns       封装的数据表列信息
* @throws IOException
* @throws TemplateException
*/
public static void writeFile(Configuration configuration, List<TableColumn> columns) throws IOException, 
TemplateException {
    File r=new File("");
    //测试环境获取项目根目录路径
    //String path=Class.class.getClass().getResource("/").getPath();
    //Jar包获取根目录路径
    String path=r.getAbsolutePath();
    //System.out.println("path:"+path);
    Configuration cfg = new Configuration();
    cfg.setDirectoryForTemplateLoading(new File(path + "/ftl")); //需要文件夹绝对路径
    cfg.setDefaultEncoding("UTF-8");
    cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
    Map root = new HashMap();
    root.put("configuration", configuration);
    root.put("columnList", columns);
    writeSingleFile(cfg, root, "DaoImpl.ftl", 
    configuration.getProjectPath(), 
    configuration.getSqlMappingPackage().replace(".", "/"), 
    configuration.getDomainObjectName(), "DaoImpl.java",configuration.getOverwrite());
    writeSingleFile(cfg, root, "Dao.ftl", 
    configuration.getProjectPath(), 
    configuration.getSqlMappingPackage().replace(".", "/"), 
    configuration.getDomainObjectName(), "Dao.java",configuration.getOverwrite());
    writeSingleFile(cfg, root, "Meta.ftl", 
    configuration.getProjectPath(), 
    configuration.getJavaModelPackage().replace(".", "/"), 
    configuration.getDomainObjectName(), ".java",configuration.getOverwrite());
}

class.path.entry=src/test/resources/mysql-connector-java-5.1.38.jar
driver.class=com.mysql.jdbc.Driver
connection.url=jdbc:mysql://localhost:3307/work
user.id=
user.password=
java.model.package=com.model
sql.mapping.package=com.dao
project=src
table.name=holiday
domain.object.name=Holiday

java -jar JavaWebCodeGenerator.jar -configfile generatorConfig.properties -overwrite