Spring加载Properties配置文件

1.@PropertySource注解2.context:property-placeholder标签2.1 参考配置2.2 例子2.2.1 在xml中取值2.2.2 在java中取值 3.util:properties 标签3.1 参考配置3.2 例子3.2.1 在xml中取值3.2.2 在java中取值 4.PropertyPlaceholderConfigurer 类2.1 参考配置2.2 例子2.2.1 在xml中取值2.2.2 在java中取值 5.PropertiesFactoryBean类5.1 参考配置 5.2 例子5.2.1 在xml中取值5.2.2 在java中取值

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IDEA使用Maven搭建SSM框架Web项目

观前提示：

IDEA版本为ultimate 2019.1，JDK版本为1.8.0_141，Tomcat版本为9.0.12，postman版本为v7.27.1。

标题2.3.4.5测试用配置文件 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/test?useSSL=false jdbc.username=root jdbc.password=root jdbc.pool.initialPoolSize=10 jdbc.pool.minPoolSize=5 jdbc.pool.maxPoolSize=40 jdbc.pool.maxIdleTime=20 jdbc.pool.checkoutTimeout=10000

1.@PropertySource注解

配置文件 test.properties

id=01 name=zhangsan age=18

配置文件加载类 TestProperties .java

package com.example.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; @Component @PropertySource(value = {"classpath:config/test.properties"}) public class TestProperties { @Value("id") private String id; @Value("name") private String name; @Value("age") private String age; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } @Override public String toString() { return "TestProperties{" + "id='" + id + '\'' + ", name='" + name + '\'' + ", age='" + age + '\'' + '}'; } }

测试文件 TestController .java

package com.example.controller; import com.example.config.TestProperties; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; @Controller @RequestMapping("/test") public class TestController { @Autowired private TestProperties testProperties; @RequestMapping(value = "/testProperties", method = RequestMethod.GET) @ResponseBody public String testProperties(){ return testProperties.toString(); } }

使用postman发送请求，测试结果为

2.context:property-placeholder标签

2.1 参考配置

xml文件中配置参考如下

<context:property-placeholder location="/WEB-INF/config/jdbc.properties"/>

注意：取值时使用 ${}

2.2 例子

2.2.1 在xml中取值

<property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/>

2.2.2 在java中取值

配置文件加载类 JdbcProperties .java

package com.example.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class JdbcProperties { @Value("${jdbc.driver}") private String driver; @Value("${jdbc.url}") private String url; public String getDriver() { return driver; } public void setDriver(String driver) { this.driver = driver; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } @Override public String toString() { return "JdbcProperties{" + "driver='" + driver + '\'' + ", url='" + url + '\'' + '}'; } }

测试类 TestController.java

package com.example.controller; import com.example.config.JdbcProperties; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; @Controller @RequestMapping("/test") public class TestController { @Autowired private JdbcProperties jdbcProperties; @RequestMapping(value = "/testProperties", method = RequestMethod.GET) @ResponseBody public String testProperties(){ return jdbcProperties.toString(); } }

使用postman发送请求，测试结果为

3.util:properties 标签

3.1 参考配置

首先，需要在xml配置文件头添加

xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd"

配置xml参考如下

<util:properties id="jdbc" local-override="true" location="/WEB-INF/config/jdbc.properties"/>

注意：取值时使用 #{}

3.2 例子

3.2.1 在xml中取值

<property name="driverClassName" value="#{jdbc['jdbc.driver']}"/> <property name="url" value="#{jdbc['jdbc.url']}"/> <property name="username" value="#{jdbc['jdbc.username']}}"/> <property name="password" value="#{jdbc['jdbc.password']}"/>

3.2.2 在java中取值

配置文件加载类 JdbcProperties .java

package com.example.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class JdbcProperties { @Value("#{jdbc['jdbc.driver']}") private String driver; @Value("#{jdbc['jdbc.url']}") private String url; public String getDriver() { return driver; } public void setDriver(String driver) { this.driver = driver; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } @Override public String toString() { return "JdbcProperties{" + "driver='" + driver + '\'' + ", url='" + url + '\'' + '}'; } }

测试类 TestController.java

package com.example.controller; import com.example.config.JdbcProperties; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; @Controller @RequestMapping("/test") public class TestController { @Autowired private JdbcProperties jdbcProperties; @RequestMapping(value = "/testProperties", method = RequestMethod.GET) @ResponseBody public String testProperties(){ return jdbcProperties.toString(); } }

使用postman发送请求，测试结果为

4.PropertyPlaceholderConfigurer 类

2.1 参考配置

xml文件中配置参考如下

<context:property-placeholder location="/WEB-INF/config/jdbc.properties"/>

注意：取值时使用 ${}

2.2 例子

2.2.1 在xml中取值

<property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/>

2.2.2 在java中取值

配置文件加载类 JdbcProperties .java

package com.example.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class JdbcProperties { @Value("${jdbc.driver}") private String driver; @Value("${jdbc.url}") private String url; public String getDriver() { return driver; } public void setDriver(String driver) { this.driver = driver; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } @Override public String toString() { return "JdbcProperties{" + "driver='" + driver + '\'' + ", url='" + url + '\'' + '}'; } }

测试类 TestController.java

package com.example.controller; import com.example.config.JdbcProperties; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; @Controller @RequestMapping("/test") public class TestController { @Autowired private JdbcProperties jdbcProperties; @RequestMapping(value = "/testProperties", method = RequestMethod.GET) @ResponseBody public String testProperties(){ return jdbcProperties.toString(); } }

使用postman发送请求，测试结果为

5.PropertiesFactoryBean类

5.1 参考配置

配置xml参考如下

<bean id="jdbc" class="org.springframework.beans.factory.config.PropertiesFactoryBean"> <property name="locations" value="/WEB-INF/config/jdbc.properties" /> </bean>

注意：取值时使用 #{}

5.2 例子

5.2.1 在xml中取值

<property name="driverClassName" value="#{jdbc['jdbc.driver']}"/> <property name="url" value="#{jdbc['jdbc.url']}"/> <property name="username" value="#{jdbc['jdbc.username']}}"/> <property name="password" value="#{jdbc['jdbc.password']}"/>

5.2.2 在java中取值

配置文件加载类 JdbcProperties .java

package com.example.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class JdbcProperties { @Value("#{jdbc['jdbc.driver']}") private String driver; @Value("#{jdbc['jdbc.url']}") private String url; public String getDriver() { return driver; } public void setDriver(String driver) { this.driver = driver; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } @Override public String toString() { return "JdbcProperties{" + "driver='" + driver + '\'' + ", url='" + url + '\'' + '}'; } }

测试类 TestController.java

package com.example.controller; import com.example.config.JdbcProperties; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; @Controller @RequestMapping("/test") public class TestController { @Autowired private JdbcProperties jdbcProperties; @RequestMapping(value = "/testProperties", method = RequestMethod.GET) @ResponseBody public String testProperties(){ return jdbcProperties.toString(); } }

使用postman发送请求，测试结果为