在spring boot中读取自定义properties中的属性的值(除application.properties外)

因为spring boot使用@Value默认是读取application.properties/application.yml中的属性,如果我们需要读取自定义的properties文件的属性,如log4j.properties/db.properties等自定义的属性的时候,做法如下

首先:新建一个类,该类用来解析properties文件的,我这里以读取log4j.properties为例

新建properties配置文件类,log4jConfig.java

package com.tencent.aics.shortlink.conf;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component  //主要是为了在其他引用的地方直接使用@Autowired
@ConfigurationProperties  //这个注解为标识为一个properties配置文件类,可以给定前缀
@PropertySource("classpath:log4j.properties")  //指定需要读取的配置文件(以及指定位置)
public class Log4jConfig {

    @Value("${log4j.appender.db.File}")   //直接使用@Value来获取值
    private String file;

      //如果指定了前缀的话,可以省略掉@Value注解,但是这个时候必须保证变量名和前缀拼起来是log4j.properties中的key,这里需要注意一下

    @Value("${log4j.appender.db.layout.ConversionPattern}")
    private String conversionPattern;


    public String getConversionPattern() {
        return conversionPattern;
    }

    public void setConversionPattern(String conversionPattern) {
        this.conversionPattern = conversionPattern;
    }

    public String getFile() {
        return file;
    }

    public void setFile(String file) {
        file = file;
    }
}

在需要使用的地方直接引入

package com.tencent.aics.shortlink.timer;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.tencent.aics.shortlink.conf.Log4jConfig;
import com.tencent.aics.shortlink.model.LogEntity;
import com.tencent.aics.shortlink.service.OperateLogService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

@Component
@EnableScheduling  //启动定时任务
public class LogTimer {

    @Autowired
    private Log4jConfig log4jConfig;  //注入配置文件类
   private static final Logger LOG = LoggerFactory.getLogger(LogTimer.class);

    /**
    上次文件的大小
     *
     */
   private long pointer = 0;
    @Autowired
    private OperateLogService operateLogService;
    //每5秒执行一次
    @Scheduled(cron = "0/5 * * * * *")
    public void testDemo() {
        try {
            System.out.println("获取的log4j的路径为:"+log4jConfig.getFile()+"sha:"+log4jConfig.getConversionPattern());
            //读取日志文件
            File file = new File(log4jConfig.getFile());
            //指定权限只读
            RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
            //移动文件读取指针的位置,从此处读取
            randomAccessFile.seek(pointer);
            if (file.isFile() && file.exists()) {
                String lineTxt = null;
                while ((lineTxt = randomAccessFile.readLine()) != null) {
                    LogEntity logEntity = handleLog(lineTxt);
                    operateLogService.insertLog(logEntity);
                   //更新指针位置
                    pointer = randomAccessFile.getFilePointer();
                }
                randomAccessFile.close();
            } else {
                LOG.error("找不到文件路径!");
            }
        }catch (Exception e){
            e.printStackTrace();
        }
       // return new ModelAndView("redirect:http://www.baidu.com");
    }

        private LogEntity handleLog(String logText){
            logText = logText.substring(logText.indexOf("{"));
            LogEntity logEntity = null;

            ObjectMapper mapper = new ObjectMapper();
            try {
                logEntity = mapper.readValue(logText, LogEntity.class);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return logEntity;
        }


}