springmvc项目applicationContext.xml读取磁盘properties属性文件

川长思鸟来 2023-06-28 11:30 8阅读 0赞

项目框架:springmvc  
开发工具:eclipse  
jdk版本:1.7  
目的:项目中的applicationContext.xml,bean对象引用磁盘中的properties属性文件,java类中可读取到properties中key对应value,xml可读取到properties中key对应value  
示例如下:

**applicationContext.xml中读取磁盘中的properties属性文件方法**

<bean id="globalProperties"	class="com.test.utils.Config">
    		<property name="order" value="1" />
    		<property name="ignoreUnresolvablePlaceholders" value="true" />
    		<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
    		<property name="ignoreResourceNotFound" value="true" />
    		<property name="locations" >
    			<list>
    				
    				<value>classpath:test.properties</value>
    				
    				<value>file:/D:/test/*.properties</value>   </list> </property> </bean> <context:property-placeholder ignore-unresolvable="true" location="file:/D:/test/datasource.properties"/> <bean id="mysql_test" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="${jdbc.test.url}"/> <property name="username" value="${jdbc.test.username}" /> <property name="password" value="${jdbc.test.password}" />  </bean>

在我的D盘下有test目录,目录下放了几个属性文件  
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**项目中读取properties中key对应value的方法**

package com.test.controller;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import data.test.utils.Config;
    
    
    @Controller
    @RequestMapping("/test")
    public class TestController { 
    
    	//方法一: 使用注解方式,读取properties中key对应的value
    	@Value("${jdbc.test.username}")
    	private String username;
    	
    	@RequestMapping("/test")
    	public @ResponseBody String test(HttpServletRequest request, 
    			HttpServletResponse response){ 
    		try { 
    			System.out.println("读取配置文件");
    			//方法一: 使用springframework的PropertyPlaceholderConfigurer,读取properties中key对应的value
    			String str = Config.getValue("aaaaaa");
    			String str2 = Config.getValue("bbbbbb");
    			String str3 = Config.getValue("cccccc");
    			String str4 = Config.getValue("dddddd");
    			System.out.println("项目外部配置文件读取到的变量1="+str);
    			System.out.println("项目外部配置文件读取到的变量2="+str2);
    			System.out.println("项目外部配置文件读取到的变量3="+str3);
    			System.out.println("项目外部配置文件读取到的变量4="+str4);
    			System.out.println("项目外部配置文件读取到的username="+username);
    			//输出结果:
    			//项目外部配置文件读取到的变量1=a111111111111111
    			//项目外部配置文件读取到的变量2=b1111111111111111111111
    			//项目外部配置文件读取到的变量3=c111111111111111111111111111111111
    			//项目外部配置文件读取到的变量4=
    			//项目外部配置文件读取到的username=zhangsan
    		} catch (Exception e) { 
    			System.out.println(e.getMessage());
    		}
    		
    		return "test";
    	}
    }

**Config.java**

package com.test.utils;
    
    import java.io.UnsupportedEncodingException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Properties;
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
    import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
    
    public class Config extends PropertyPlaceholderConfigurer { 
    	private static Map<String, String> globalCode = null;
    
    	@Override
    	protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props)
    			throws BeansException { 
    		super.processProperties(beanFactoryToProcess, props);
    		valuemap = new HashMap<String, String>();
    		for (Object key : props.keySet()) {   
                String keyStr = key.toString();  
                String value = null;
    			try { 
    				value = new String(props.getProperty(keyStr).getBytes("iso-8859-1"), "UTF-8");
    			} catch (UnsupportedEncodingException e) { 
    				e.printStackTrace();
    			}  
                valuemap.put(keyStr, value);  
            }
    	}
    	public static String getValue(String key) {   
            return valuemap.get(key)==null?"":valuemap.get(key);
        } 
    
    }

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