如何使用Logback设置property参数

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Logback设置property参数

1.方式一：直接配置参数值

<configuration>

  <property name="USER_HOME" value="/home/sebastien" />

  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
    <file>${USER_HOME}/myApp.log</file>
    <encoder>
      <pattern>%msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="FILE" />
  </root>
</configuration>

2.方式二：通过file属性引入参数文件

<configuration>

  <!-- 引入项目内的文件指定文件所在的包路径 -->
  <property file="src/main/java/chapters/configuration/variables1.properties" />
  <!-- 引入项目外的文件指定文件所在的绝对路径 -->
  <property file="/home/logback/variables.properties" />

  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <file>${USER_HOME}/myApp.log</file>
     <encoder>
       <pattern>%msg%n</pattern>
     </encoder>
   </appender>
   <root level="debug">
     <appender-ref ref="FILE" />
   </root>
</configuration>

3.方式三：通过resource属性引入参数文件

<configuration>
  <!-- 使用classpath的方式引入文件，只需写明文件名即可 -->
  <property resource="resource1.properties" />

  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <file>${USER_HOME}/myApp.log</file>
     <encoder>
       <pattern>%msg%n</pattern>
     </encoder>
   </appender>

   <root level="debug">
     <appender-ref ref="FILE" />
   </root>
</configuration>

4.引入文件处理类PropertyAction

文件所在路径：ch.qos.logback.core.joran.action

在begin方法中读取引入的properies文件，如果引入的文件中的参数值需要进行额外的加工处理，可重写覆盖此类，在begin或loadAndSetProperties方法中添加相关逻辑

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.joran.action;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.action.ActionUtil.Scope;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.pattern.util.RegularEscapeUtil;
import ch.qos.logback.core.util.Loader;
import ch.qos.logback.core.util.OptionHelper;

/**
 * This class serves as a base for other actions, which similar to the ANT
 * <property> task which add/set properties of a given object.
 * 
 * This action sets new substitution properties in the logging context by name,
 * value pair, or adds all the properties passed in "file" or "resource"
 * attribute.
 * 
 * @author Ceki Gülcü
 */
public class PropertyAction extends Action {

    static final String RESOURCE_ATTRIBUTE = "resource";

    static String INVALID_ATTRIBUTES = "In <property> element, either the "file" attribute alone, or "
                    + "the "resource" element alone, or both the "name" and "value" attributes must be set.";

    /**
     * Set a new property for the execution context by name, value pair, or adds
     * all the properties found in the given file.
     * 
     */
    public void begin(InterpretationContext ec, String localName, Attributes attributes) {

        if ("substitutionProperty".equals(localName)) {
            addWarn("[substitutionProperty] element has been deprecated. Please use the [property] element instead.");
        }

        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);
        String scopeStr = attributes.getValue(SCOPE_ATTRIBUTE);

        Scope scope = ActionUtil.stringToScope(scopeStr);

        if (checkFileAttributeSanity(attributes)) {
            String file = attributes.getValue(FILE_ATTRIBUTE);
            file = ec.subst(file);
            try {
                FileInputStream istream = new FileInputStream(file);
                loadAndSetProperties(ec, istream, scope);
            } catch (FileNotFoundException e) {
                addError("Could not find properties file [" + file + "].");
            } catch (IOException e1) {
                addError("Could not read properties file [" + file + "].", e1);
            }
        } else if (checkResourceAttributeSanity(attributes)) {
            String resource = attributes.getValue(RESOURCE_ATTRIBUTE);
            resource = ec.subst(resource);
            URL resourceURL = Loader.getResourceBySelfClassLoader(resource);
            if (resourceURL == null) {
                addError("Could not find resource [" + resource + "].");
            } else {
                try {
                    InputStream istream = resourceURL.openStream();
                    loadAndSetProperties(ec, istream, scope);
                } catch (IOException e) {
                    addError("Could not read resource file [" + resource + "].", e);
                }
            }
        } else if (checkValueNameAttributesSanity(attributes)) {
            value = RegularEscapeUtil.basicEscape(value);
            // now remove both leading and trailing spaces
            value = value.trim();
            value = ec.subst(value);
            ActionUtil.setProperty(ec, name, value, scope);

        } else {
            addError(INVALID_ATTRIBUTES);
        }
    }

    void loadAndSetProperties(InterpretationContext ec, InputStream istream, Scope scope) throws IOException {
        Properties props = new Properties();
        props.load(istream);
        istream.close();
        ActionUtil.setProperties(ec, props, scope);
    }

    boolean checkFileAttributeSanity(Attributes attributes) {
        String file = attributes.getValue(FILE_ATTRIBUTE);
        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);
        String resource = attributes.getValue(RESOURCE_ATTRIBUTE);

        return !(OptionHelper.isEmpty(file)) && (OptionHelper.isEmpty(name) && OptionHelper.isEmpty(value) && OptionHelper.isEmpty(resource));
    }

    boolean checkResourceAttributeSanity(Attributes attributes) {
        String file = attributes.getValue(FILE_ATTRIBUTE);
        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);
        String resource = attributes.getValue(RESOURCE_ATTRIBUTE);

        return !(OptionHelper.isEmpty(resource)) && (OptionHelper.isEmpty(name) && OptionHelper.isEmpty(value) && OptionHelper.isEmpty(file));
    }

    boolean checkValueNameAttributesSanity(Attributes attributes) {
        String file = attributes.getValue(FILE_ATTRIBUTE);
        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);
        String resource = attributes.getValue(RESOURCE_ATTRIBUTE);

        return (!(OptionHelper.isEmpty(name) || OptionHelper.isEmpty(value)) && (OptionHelper.isEmpty(file) && OptionHelper.isEmpty(resource)));
    }

    public void end(InterpretationContext ec, String name) {
    }

    public void finish(InterpretationContext ec) {
    }
}

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