Java通过CMD方式读取注册表任意键值对代码实践

需要读取如图所示注册表【HKEY_LOCAL_MACHINESOFTWAREEasyDrv7】节点下的【DateTime】的值

直接上代码：

package com.beibei.common.util.cmd;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RegistryUtil {
private static Logger logger = LoggerFactory.getLogger(RegistryUtil.class);

public static Map readNode(String nodePath) {
Map regMap = new HashMap<>();
try {
Process process = Runtime.getRuntime().exec("reg query " + nodePath);
process.getOutputStream().close();
InputStreamReader isr = new InputStreamReader(process.getInputStream());
String line = null;
BufferedReader ir = new BufferedReader(isr);
while ((line = ir.readLine()) != null) {
String[] arr = line.split(" ");
if(arr.length != 4){
continue;
}
regMap.put(arr[1], arr[3]);
}
process.destroy();
} catch (IOException e) {
logger.error("读取注册表失败, nodePath: " + nodePath, e);
}
return regMap;
}

public static String readValue(String nodePath, String key) {
Map regMap = readNode(nodePath);
return regMap.get(key);
}
public static void main(String[] args) {
String paramValue = RegistryUtil.readValue("HKEY_LOCAL_MACHINE\SOFTWARE\EasyDrv7", "DateTime");
System.out.println(paramValue);
}
}

其原理是通过CMD命令【reg query HKEY_LOCAL_MACHINESOFTWAREEasyDrv7】 读取节点全部键值对，再通过解析得到我们所需要的【DateTime】的值。

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