关于Spring properties --> Map 注入到bean中

本文介绍如何使用Spring将properties文件以Map形式注入到Bean中,并演示了通过自定义PropertiesFactoryBean来实现properties文件到Map的复杂转换。

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Spring properties to map

一个key-value形式的properties文件 以Map的形式注入到Spring的bean中

properties文件形式

RF09001=fooService#method1#name,phone

spring 配置

    <bean id="noMethodMap" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="location" value="classpath:foo.properties"/>
    </bean>

注入到Bean中

    @Resource(name="noMethodMap")
    private Map<String, String> noMethodMap;

其他

如何定位注入源码

修改为一个不存在的资源名称

@Resource(name="nonexist")

此时启动会报错

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'nonexist' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1207)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:522)

可知是在哪里注入的了

在哪里将PropertiesFactoryBean转成Map

同样的处理方式 将注入变量修改成一个错误的类型 查看错误信息即可

private String noMethodMap; // map --> String

启动会报错

Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'noMethodMap' is expected to be of type 'java.lang.String' but was actually of type 'java.util.Properties'
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:378)

就知道是在哪里进行类型转换的了

如果想对properties-->Map做一下自定义的处理呢

如RF09001-RF09010对应的都是同一个value

RF09001-RF09003=fooService#method1#name,phone

但是想Map中的实际形式为

RF09001=fooService#method1#name,phone
RF09002=fooService#method1#name,phone
RF09003=fooService#method1#name,phone

继承PropertiesFactoryBean 覆盖createProperties即可

public class MyPropertiesFactoryBean extends PropertiesFactoryBean{
    @Override
    protected Properties createProperties() throws IOException {
        Properties properties = super.createProperties();
        Enumeration<String> propertyNames = (Enumeration<String>) properties.propertyNames();
        while(propertyNames.hasMoreElements()){
            String name = propertyNames.nextElement();
            if(name.matches("\\w+-\\w+")){
                String rawName = name;
                String[] split = rawName.split("-");
                Integer start = Integer.valueOf(split[0].substring(2));
                Integer end = Integer.valueOf(split[1].substring(2));
                for (int i = start; i <= end; i++) {
                    properties.setProperty("RF" + i, properties.getProperty(rawName));
                }
            }
        }
        return properties;
    }

spring配置改成

<bean id="noMethodMap" class="com.foo.app.util.MyPropertiesFactoryBean">
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>3.4.7</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>takeoutsystem</artifactId> <version>0.0.1-SNAPSHOT</version> <name>takeoutsystem</name> <description>takeoutsystem</description> <properties> <java.version>17</java.version> <!-- 关键修改:升级MyBatis到3.5.15 --> <mybatis.version>3.5.15</mybatis.version> <mybatis-plus.version>3.5.7</mybatis-plus.version> <mybatis-spring.version>3.0.3</mybatis-spring.version> <jjwt.version>0.11.5</jjwt.version> <springdoc-openapi.version>2.8.5</springdoc-openapi.version> <thymeleaf-extras-springsecurity6.version>3.1.2.RELEASE</thymeleaf-extras-springsecurity6.version> </properties> <dependencyManagement> <dependencies> <!-- 强制所有模块使用此MyBatis版本 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis-spring.version}</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- Spring Boot 基础依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!-- MyBatis-Plus 依赖(排除冲突版本) --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>${mybatis-plus.version}</version> <exclusions> <exclusion> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> </exclusion> <exclusion> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> </exclusion> </exclusions> </dependency> <!-- 显式指定升级后的MyBatis版本 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis-spring.version}</version> </dependency> <!-- 数据库依赖 --> <dependency> <groupId>com.mysql</groupId> <artifactId>mysql-connector-j</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>test</scope> </dependency> <!-- 安全与认证依赖 --> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-api</artifactId> <version>${jjwt.version}</version> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-impl</artifactId> <version>${jjwt.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-jackson</artifactId> <version>${jjwt.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.thymeleaf.extras</groupId> <artifactId>thymeleaf-extras-springsecurity6</artifactId> <version>${thymeleaf-extras-springsecurity6.version}</version> </dependency> <!-- API文档 --> <dependency> <groupId>org.springdoc</groupId> <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId> <version>${springdoc-openapi.version}</version> </dependency> <!-- 测试依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter-test</artifactId> <version>${mybatis-plus.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <scope>provided</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 修改代码,只保留Mybatis
最新发布
07-15
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