java 读取 注册表

package com.lubansoft.service;import java.io.*;public class RegQuery {private static final String REGQUERY_UTIL = "reg query ";private static final String REGSTR_TOKEN = "REG_SZ";private static final String REGDWORD_TOKEN = "REG_DWORD";private static final String PERSONAL_FOLDER_CMD = REGQUERY_UTIL+ "\"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\"+ "Explorer\\Shell Folders\" /v Personal";private static final String CPU_SPEED_CMD = REGQUERY_UTIL+ "\"HKLM\\HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0\""+ " /v ~MHz";private static final String CPU_NAME_CMD = REGQUERY_UTIL+ "\"HKLM\\HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0\""+ " /v ProcessorNameString";private static final String HTTP_DEFAULT_BROWSERURI = REGQUERY_UTIL+ "\"HKEY_CLASSES_ROOT\\http\\shell\\open\\command\"" + "";// http\\shell\\open\\ddeexec\\Topicprivate static final String HTTP_DEFAULT_BROWSERNAME = REGQUERY_UTIL+ "\"HkEY_CLASSES_ROOT\\http\\shell\\open\\ddeexec\\Topic\"" + "";public static String getCurrentUserPersonalFolderPath() {try {Process process = Runtime.getRuntime().exec(PERSONAL_FOLDER_CMD);StreamReader reader = new StreamReader(process.getInputStream());reader.start();process.waitFor();reader.join();String result = reader.getResult();int p = result.indexOf(REGSTR_TOKEN);if (p == -1)return null;return result.substring(p + REGSTR_TOKEN.length()).trim();} catch (Exception e) {return null;}}public static String getCPUSpeed() {try {Process process = Runtime.getRuntime().exec(CPU_SPEED_CMD);StreamReader reader = new StreamReader(process.getInputStream());reader.start();process.waitFor();reader.join();String result = reader.getResult();int p = result.indexOf(REGDWORD_TOKEN);if (p == -1)return null;// CPU speed in Mhz (minus 1) in HEX notation, convert it to DECString temp = result.substring(p + REGDWORD_TOKEN.length()).trim();return Integer.toString((Integer.parseInt(temp.substring("0x".length()), 16) + 1));} catch (Exception e) {return null;}}public static String getCPUName() {try {Process process = Runtime.getRuntime().exec(HTTP_DEFAULT_BROWSERURI);StreamReader reader = new StreamReader(process.getInputStream());reader.start();process.waitFor();reader.join();String result = reader.getResult();int p = result.indexOf(REGSTR_TOKEN);if (p == -1)return null;return result.substring(p + REGSTR_TOKEN.length()).trim();} catch (Exception e) {return null;}}static class StreamReader extends Thread {private InputStream is;private StringWriter sw;StreamReader(InputStream is) {this.is = is;sw = new StringWriter();}public void run() {try {int c;while ((c = is.read()) != -1)sw.write(c);} catch (IOException e) {;}}String getResult() {return sw.toString();}}public static void main(String s[]) {System.out.println("Personal directory : "+ getCurrentUserPersonalFolderPath());System.out.println("CPU Name : " + getCPUName());System.out.println("CPU Speed : " + getCPUSpeed() + " Mhz");}}

 

提取出方法：

public static String getPath(){try {Process process = Runtime.getRuntime().exec(xxx);StreamReader reader = new StreamReader(process.getInputStream());reader.start();process.waitFor();reader.join();String result = reader.getResult();int p = result.indexOf(REGSTR_TOKEN);if (p == -1)return null;result =  result.substring(p + REGSTR_TOKEN.length()).trim();p = result.indexOf("\n");if(p != -1){result = result.substring(0, p);}return result.replace("\r", "");} catch (Exception e) {return null;}}

 

static class StreamReader extends Thread {private InputStream is;private StringWriter sw;StreamReader(InputStream is) {this.is = is;sw = new StringWriter();}public void run() {try {int c;while ((c = is.read()) != -1)sw.write(c);} catch (IOException e) {}}String getResult() {return sw.toString();}}