Spring的DI注入方式：xml注入

淩亂°似流年 2023-01-11 08:35 189阅读 0赞

/\* \* @Autowired private IStudentService studentService; */ @Test public void myTest2() \{ String resoure = “applicationContext.xml”; ApplicationContext applicationContext = new ClassPathXmlApplicationContext(resoure); // property：设值注入 /* \* Student student=(Student) applicationContext.getBean(“StudentBean”); \* System.out.println(student); //Student \[studentId=null, \* classId=15,studentname=张三, gender=男\] \* 加上School实体类 //Student \[studentId=null,classId=15, studentname=张三, gender=男, school=School \[school=广东大学\]\] */ // constructor-arg：构造注入：不需要set,所有属性都要赋值 /* \* Student student=(Student)applicationContext.getBean(“StudentBean”); \* System.out.println(student); \* Student \[studentId=16, classId=17,studentname=李四, gender=王五\] \* 加上School实体类 \* //Student \[studentId=16, classId=17,studentname=李四, gender=王五, school=School\[school=广东大学\]\] */ // 命名空间注入1，p：xmlns:p="http://www.springframework.org/schema/p // 命名空间注入2，c：xmlns:p="http://www.springframework.org/schema/c // 二者用法一致 /* \* Student student=(Student)applicationContext.getBean(“StudentBean”); \* System.out.println(student); //Student \[studentId=null, classId=18, \* //studentname=鬼六, gender=null, school=School \[school=广东大学\]\] */ //集合注入：name命名与实体类一致 /* \* Some some=(Some) applicationContext.getBean(“someBean”); \* System.out.println(some); \* //Some \[schools=\[School \[school=广东大学1\], School\[school=广东大学2\]\], myList=\[张三, 李四\], mySet=\[广东, 湖南\], myMap=\{今天=还行, 明天=美好\},myProps=\{您好=晴天, 你好=雨天\}\] */ //域属性自动注入：autowire //byname，将域属性名做为id到容器中查找相同名称的bean进行自动注入：name要求实体类名称一致 //bytype，将域属性类型做为id到容器中查找相同名称的bean进行自动注入：要求相同类型的bean不能多于一个(包含以及其字类) /* \* Student student=(Student)applicationContext.getBean(“StudentBean”); \* System.out.println(student); //Student \[studentId=null, classId=null, \* studentname=张三, gender=男, school=School \[school=广东大学\]\] */ //spring el表达式简称：SPEL表达式注入：格式：\#\{Student.gender\} //感觉与el表达式差不多 //匿名bean：没有name和id的bean //内部bean注入： /* \* Student student=(Student)applicationContext.getBean(“StudentBean”); \* System.out.println(student); //Student \[studentId=null, classId=null, \* studentname=张三, gender=男, school=School \[school=广东大学\]\] */ //使用同类抽象bean注入：parent=“父” /* \* Student student1=(Student)applicationContext.getBean(“StudentBean1”); Student \* student2=(Student)applicationContext.getBean(“StudentBean2”); \* System.out.println(student1); System.out.println(student2); //Student \* \[studentId=null, classId=1, studentname=张三, gender=男, school=null\] //Student \* \[studentId=null, classId=1, studentname=李四, gender=男, school=null\] \*/ //使用异类抽象bean注入：原理一致，提出相同属性赋值即可

Applicationcontext配置：  
加上School实体类 张三 李四 广东 湖南 雨天 晴天 内部匿名bean