BrokerStartup.java

// 指定配置文件            if (commandLine.hasOption('c')) {                String file = commandLine.getOptionValue('c');                if (file != null) {                    configFile = file;                    InputStream in = new BufferedInputStream(new FileInputStream(file));                    properties = new Properties();                    properties.load(in);                    MixAll.properties2Object(properties, brokerConfig);                    MixAll.properties2Object(properties, nettyServerConfig);                    MixAll.properties2Object(properties, nettyClientConfig);                    MixAll.properties2Object(properties, messageStoreConfig);                    BrokerPathConfigHelper.setBrokerConfigPath(file);                    System.out.println("load config properties file OK, " + file);                }            }

MixAll.java

/**     * 将Properties中的值写入Object     */    public static void properties2Object(final Properties p, final Object object) {        Method[] methods = object.getClass().getMethods();        for (Method method : methods) {            String mn = method.getName();            if (mn.startsWith("set")) {                try {                    String tmp = mn.substring(4);                    String first = mn.substring(3, 4);                    String key = first.toLowerCase() + tmp;                    String property = p.getProperty(key);                    if (property != null) {                        Class
     [] pt = method.getParameterTypes();                        if (pt != null && pt.length > 0) {                            String cn = pt[0].getSimpleName();                            Object arg = null;                            if (cn.equals("int")) {                                arg = Integer.parseInt(property);                            }                            else if (cn.equals("long")) {                                arg = Long.parseLong(property);                            }                            else if (cn.equals("double")) {                                arg = Double.parseDouble(property);                            }                            else if (cn.equals("boolean")) {                                arg = Boolean.parseBoolean(property);                            }                            else if (cn.equals("String")) {                                arg = property;                            }                            else {                                continue;                            }                            method.invoke(object, new Object[] { arg });                        }                    }                }                catch (Throwable e) {                }            }        }    }

由资源文件生成对象：

 

首先获取资源文件

获取对象的所有set开头的方法

截取方法，如：setMethod1  则为 method1

通过key获取properties文件value

获取该方法参数类型

调用该方法。

从而完成set 。