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🍒系列专栏：SSM框架

目录

1.为集合类型属性赋值

①为List集合类型属性赋值

②为Map集合类型属性赋值

2.p命名空间

3.引入外部属性文件 

1.为集合类型属性赋值

①为List集合类型属性赋值

private List students;
public List getStudents() {
return students;
}
public void setStudents(List students) {
this.students = students;
}

若为Set集合类型属性赋值，只需要将其中的list标签改为set标签即可

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测试：

    @org.junit.Testpublic void testHelloWorld(){ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");Clazz clazzTwo = ac.getBean("clazzTwo", Clazz.class);System.out.println(clazzTwo);

方法2：配置一个集合类型的bean，需要使用util 的约束-

效果一样的：

②为Map集合类型属性赋值

创建教师类Teacher：

public class Teacher {private Integer tid;private String tname;public Teacher() {}public Teacher(Integer tid, String tname) {this.tid = tid;this.tname = tname;}public Integer getTid() {return tid;}public void setTid(Integer tid) {this.tid = tid;}public String getTname() {return tname;}public void setTname(String tname) {this.tname = tname;}@Overridepublic String toString() {return "Teacher{" +"tid=" + tid +", tname='" + tname + '\'' +'}';}
}

private Map teacherMap;
public Map getTeacherMap() {
return teacherMap;
}
public void setTeacherMap(Map teacherMap) {
this.teacherMap = teacherMap;
}

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 测试：

    public void testHelloWorld(){ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");Student student = ac.getBean("student", Student.class);System.out.println(student);}

方法2：配置bean（util:map):

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2.p命名空间

引入p命名空间后，可以通过以下方式为bean的各个属性赋值

3.引入外部属性文件 

①加入依赖

mysql
mysql-connector-java
8.0.16



com.alibaba
druid
1.0.31

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm? serverTimezone=UTC
jdbc.username=root
jdbc.password=root

    public void test(){
        ClassPathXmlApplicationContext ioc = new ClassPathXmlApplicationContext("spring-datasource.xml");
        DruidDataSource bean = ioc.getBean(DruidDataSource.class);
        try {
            System.out.println(bean.getConnection());
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }

    }