关于读取 resource.propety 文件工具文件-优快云博客

本文链接：https://blog.youkuaiyun.com/Javazzc123/article/details/23612375

本文详细解析了Java中通过Properties类读取配置文件的原理及实现过程，包括资源路径获取、文件输入流操作、异常处理和资源值获取等关键步骤。重点介绍了三种不同的配置文件读取方式，以及如何在不同场景下灵活应用。

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package com.xiaoma.util;

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;

public class SysUtil {
static String resourceconfigPath = "";

public static Properties getProperties(String filefullname) {
FileInputStream fis = null;
try {
File file = new File(filefullname);
Properties properties = new Properties();
fis = new FileInputStream(file);
properties.load(fis);
return properties;
} catch (Exception e) {
// logger.error(e);
return null;
} finally {
try {
if (fis != null) {
fis.close();
}
} catch (Exception e) {
return null;
}
}
}

public static String getResourceconfigPath() {
if (resourceconfigPath.equals("")) {
String classPath = SysUtil.class.getClassLoader()
.getResource(SysUtil.class.getName().replace('.', '/') + ".class").getFile();
String classRoot = "";
classRoot = classPath.substring(0, classPath.indexOf("/com/xiaoma/bank/util"));
if (!classRoot.equals("") && classRoot.startsWith("/") && classRoot.indexOf(":") == 2) {
classRoot = classRoot.substring(1);
}
// this.getClass().getClassLoader().getResource("rule.xml").getPath();
if (!classRoot.equals("")) {
resourceconfigPath = classRoot + "/resource.properties";
}
}
return resourceconfigPath;
}

public static String getResourceValue(String key) {
Properties resourceProperties = SysUtil.getProperties(getResourceconfigPath());
return resourceProperties.getProperty(key);
}

}

//第一种可以放在自己的定义的路径下

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class dfsfd{
    private static Properties props = new Properties();
    static {
        try {
            InputStream in = WebConf.class.getResourceAsStream("/appConfig.properties");
            props.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String getValue(String key) {
        try {
            String value = props.getProperty(key);
            return value;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

}

    public static void main(String[] args) {
        System.out.println(WebConf.getValue("serviceBaseUrl"));
    }

}

//第二种放在 resource 下

package com.xiaoma.utils;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Properties;

public class Constants {
    private static String configFile = "/config.properties";

    public static String unionPay_pinBlockKey;
    static {
        Properties properties = new Properties();
        InputStream in = null;
        String value = null;
        String fieldName = null;
        String fieldType = null;
        Method method = null;
        try {
            in = Constants.class.getResourceAsStream(configFile);
            properties.load(in);
            Class<Constants> clazz = Constants.class;
            Constants obj = clazz.newInstance();
            Field[] fields = clazz.getDeclaredFields();
            for (Field field : fields) {
                fieldName = field.getName();
                if (properties.containsKey(fieldName)) {
                    method = Properties.class.getDeclaredMethod("getProperty", String.class);
                    value = (String) method.invoke(properties, fieldName);
                    value = new String(value.getBytes("ISO-8859-1"), "UTF-8");
                    if (null != value) {
                        fieldType = field.getType().getName();
                        if (String.class.getName().equals(fieldType)) {
                            field.set(obj, value);
                        } else if ("int".equals(fieldType)) {
                            field.setInt(obj, Integer.parseInt(value));
                        } else if ("boolean".equals(fieldType)) {
                            field.setBoolean(obj, Boolean.parseBoolean(value));
                        } else {
                        }
                    }
                }
            }
        } catch (Exception e) {
            System.err.println("载入配置文件" + configFile + "时发生错误");
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }