Spring配置文件的几种读取方式

女爷i 2021-09-24 16:24 503阅读 0赞

项目路径：[https://gitee.com/wuhan1/spring-parent.git][https_gitee.com_wuhan1_spring-parent.git] 下的spring-01  
1.新建spring工程，引入需要依赖的最少jar包，spring-aop,spring-beans,spring-content,spring-core,spring-expression  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RoajE5OTE4MQ_size_16_color_FFFFFF_t_70][]

<properties>
            <spring.version>5.0.4.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.2</version>
            </dependency>
    
        </dependencies>

applicationContext.xml文件

Student类

public class Student {
        //学号
        private Integer stuNo;
        //姓名
        private String stuName;
    
        public Integer getStuNo() {
            return stuNo;
        }
    
        public void setStuNo(Integer stuNo) {
            this.stuNo = stuNo;
        }
    
        public String getStuName() {
            return stuName;
        }
    
        public void setStuName(String stuName) {
            this.stuName = stuName;
        }
    
        public Student(Integer stuNo, String stuName) {
            this.stuNo = stuNo;
            this.stuName = stuName;
        }
    
        public Student() {
        }
    }

方式1：

ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
            Student student = (Student) context.getBean("student");
            System.out.println(student);

方式2：

BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("applicationContext.xml"));
            Student student = (Student) beanFactory.getBean("student");
            System.out.println(student);

方法1和方法2是基于classpath解析配置文件  
  
方式3：

FileSystemXmlApplicationContext context = new FileSystemXmlApplicationContext("/spring-01/src/main/resources/applicationContext.xml");
            Student student = (Student) context.getBean("student");
            System.out.println(student);

此方式是已项目为根路径，需要些xml文件在项目中的全路径  
  
方式4：

String rootPath = System.getProperty("user.dir");
            BeanFactory context = new XmlBeanFactory(new FileSystemResource(rootPath+"/spring-01/src/main/resources/applicationContext.xml"));
            Student student = (Student) context.getBean("student");
            System.out.println(student);

此方式以系统为根路径  
  
方式5：

<listener>
    	  	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    	  </listener>
    	  <context-param>
    	  	<param-name>contextConfigLocation</param-name>
    	  	<param-value>classpath:applicationContext.xml</param-value>
    	  </context-param>

通过监听器的方式，这种是我最常用的，通常在整合其他框架的时候，就是这样用的。

[https_gitee.com_wuhan1_spring-parent.git]: https://gitee.com/wuhan1/spring-parent.git
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2RoajE5OTE4MQ_size_16_color_FFFFFF_t_70]: /images/20210923/74529038e8fa455e9f5bc89b8fb0fbad.png