在学习MyBatis的过程中，不仅要掌握其设计理念，还需深入了解其中使用的设计模式。本文总结了在学习MyBatis时所接触到的7种设计模式，并将持续更新。
1、建造者模式（Builder模式）示例：
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代码语言：javascript代码运行次数：0运行复制“`javascriptpublic class Book {private Integer id;private String name;public Book() {}public Book(Integer id, String name) {this.id = id;this.name = name;}@Overridepublic String toString() {return “Book{” +”id=” + id +”, name='” + name +’}’;}// 使用内部类实现建造者模式public static class Builder {private Integer id;private String name;public Builder id(Integer id) {this.id = id;return this;}public Builder name(String name) {this.name = name;return this;}public Book build() {return new Book(id, name);}}}/**
通过这种方式实现了链式创建，与Lombok的@Builder注解功能类似。*/public class BuilderTest {public static void main(String[] args) {Book book = new Book.Builder().id(1).name(“三国”).build();System.out.println(book.toString());}}
MyBatis中对Builder模式的应用不仅仅限于内部类的方式。例如：
代码语言：javascript代码运行次数：0运行复制```javascript/**
根据不同的输入参数构建SqlSessionFactory工厂对象。最终会调用这个build方法，创建SqlSessionFactory的实现类*/public class SqlSessionFactoryBuilder {public SqlSessionFactory build(Reader reader) {return build(reader, null, null);}public SqlSessionFactory build(Reader reader, String environment) {return build(reader, environment, null);}public SqlSessionFactory build(Reader reader, Properties properties) {return build(reader, null, properties);}public SqlSessionFactory build(Reader reader, String environment, Properties properties) {XMLConfigBuilder parser = new XMLConfigBuilder(reader, environment, properties);return build(parser.parse());}public SqlSessionFactory build(InputStream inputStream) {return build(inputStream, null, null);}public SqlSessionFactory build(InputStream inputStream, String environment) {return build(inputStream, environment, null);}public SqlSessionFactory build(InputStream inputStream, Properties properties) {return build(inputStream, null, properties);}public SqlSessionFactory build(InputStream inputStream, String environment, Properties properties) {XMLConfigBuilder parser = new XMLConfigBuilder(inputStream, environment, properties);return build(parser.parse());}// 最终会调用这个build方法，创建SqlSessionFactory的实现类public SqlSessionFactory build(Configuration config) {return new DefaultSqlSessionFactory(config);}}
以上就是MyBatis之设计模式学习总结的详细内容，更多请关注创想鸟其它相关文章！
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