net.ymate.platform.commons.util.SystemEnvUtils Maven / Gradle / Ivy
/*
* Copyright 2007-2107 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.ymate.platform.commons.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
*
* SystemEnvUtils
*
*
* 系统环境变量工具类
*
*
* @author 刘镇([email protected])
* @version 0.0.0
*
*
* 版本号 动作 修改人 修改时间
*
*
*
* 0.0.0
* 创建类
* 刘镇
* 2010-8-2上午10:11:43
*
*
*/
public class SystemEnvUtils {
private static final Log _LOG = LogFactory.getLog(SystemEnvUtils.class);
/**
* 系统环境变量映射
*/
private static final Map SYSTEM_ENV_MAP = new HashMap();
static {
initSystemEnvs();
}
/**
* 私有构造器， 防止被实例化
*/
private SystemEnvUtils() {
}
/**
* 初始化系统环境，获取当前系统环境变量
*/
public static void initSystemEnvs() {
Process p = null;
try {
if (SystemUtils.IS_OS_WINDOWS) {
p = Runtime.getRuntime().exec("cmd /c set");
} else if (SystemUtils.IS_OS_UNIX) {
p = Runtime.getRuntime().exec("/bin/sh -c set");
} else {
_LOG.warn("Unknown os.name=" + SystemUtils.OS_NAME);
SYSTEM_ENV_MAP.clear();
}
if (p != null) {
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = br.readLine()) != null) {
int i = line.indexOf("=");
if (i > -1) {
String key = line.substring(0, i);
String value = line.substring(i + 1);
SYSTEM_ENV_MAP.put(key, value);
}
}
}
} catch (IOException e) {
_LOG.warn(RuntimeUtils.unwrapThrow(e));
}
}
/**
* 获取系统运行时，可以进行缓存
*
* @return 环境变量对应表
*/
public static Map getSystemEnvs() {
if (SYSTEM_ENV_MAP.isEmpty()) {
initSystemEnvs();
}
return SYSTEM_ENV_MAP;
}
/**
* 获取指定名称的环境值
*
* @param envName 环境名，如果为空，返回null
* @return 当指定名称为空或者对应名称环境变量不存在时返回空
*/
public static String getSystemEnv(String envName) {
if (StringUtils.isNotBlank(envName)) {
if (SYSTEM_ENV_MAP.isEmpty()) {
initSystemEnvs();
}
return SYSTEM_ENV_MAP.get(envName);
}
return null;
}
}