Java程序执行Cmd指令所遇问题记录及解决方案

* @see ProcessBuilder
* @since 1.3
*/
public Process exec(String[] cmdarray, String[] envp, File dir)
throws IOException {
return new ProcessBuilder(cmdarray)
.environment(envp)
.directory(dir)
.start();
}

// 外部程序的输出放到了错误信息输出流中，不将错误信息流输出到文件话，输出信息就看不到了😂
      pb.redirectErrorStream(true);
      // 把执行结果输出
      pb.redirectOutput(file);
      //等待语句执行完成，否则可能会读不到结果。
      pb.start().waitFor();
      InputStream in = new FileInputStream(file);
      br = new BufferedReader(new InputStreamReader(in,charsetName));
      String line = null;
      while ((line = br.readLine()) != null) {
        outPutResult.append(line).append("\n");
      }
      br.close();
      br = null;
      // 删除临时文件
      file.delete();

public static StringBuilder runOutCmdTest(String command) {
    BufferedReader br = null;
    StringBuilder outPutResult = new StringBuilder();
    try{
    ProcessBuilder pb = new ProcessBuilder().command("cmd.exe", "/c", command);
    // 外部程序的输出放到了错误信息输出流中
    pb.redirectErrorStream(true);
    // 等待语句执行完成，否则可能会读不到结果。
    Process process = pb.start();
    process.waitFor();
    InputStream inputStream = process.getInputStream();
    br = new BufferedReader(new InputStreamReader(inputStream, "GBK"));
    String line;
    while ((line = br.readLine()) != null) {
      outPutResult.append(line).append("\n");
    }
    br.close();
    br = null;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return outPutResult;
  }

private static final String TEMP_FILE_PATH = "D:\\temp.txt";

  /**
   * 运行外部程序命令 无参数时调用
   * @param command 输入命令
   * @return 输出内容
   */
  public static StringBuilder runOutCmd(String command) {
    // 默认字符解析GBK
    return runOutCmd(command, null,"GBK");
  }

  /**
   * 运行外部程序命令 带参数
   * @param command 输入命令
   * @param args 输入参数
   * @return
   */
  public static StringBuilder runOutCmd(String command, List<String> args) {
    // 默认字符解析GBK
    return runOutCmd(command, args,"GBK");
  }

  /**
   * 运行外部程序命令 - 带参数并规定字符解析格式
   * @param args 输入参数
   * @param command 输入命令
   * @param charsetName 输出字符解析格式
   * @return
   */
  public static StringBuilder runOutCmd(String command, List<String> args, String charsetName) {
    BufferedReader br = null;
    StringBuilder outPutResult = new StringBuilder();
    try {
      // 新建一个用来存储子进程输出结果结果的缓存文件
      File file = new File(TEMP_FILE_PATH);
      if (!file.getParentFile().exists()) {
        file.getParentFile().mkdirs();
      }
      if (!file.exists()) {
        file.createNewFile();
      }
      List<String> execCommand = new LinkedList<>();
      if (args != null) {
        execCommand.addAll(args);
      }
      execCommand.add(0,command);
      execCommand.add(0,"/c");
      execCommand.add(0,"cmd.exe");
      ProcessBuilder pb = new ProcessBuilder().command(execCommand).inheritIO();
      // 外部程序的输出放到了错误信息输出流中
      pb.redirectErrorStream(true);
      // 把执行结果输出
      pb.redirectOutput(file);
      //等待语句执行完成，否则可能会读不到结果。
      pb.start().waitFor();
      InputStream in = new FileInputStream(file);
      br = new BufferedReader(new InputStreamReader(in,charsetName));
      String line = null;
      while ((line = br.readLine()) != null) {
        outPutResult.append(line).append("\n");
      }
      br.close();
      br = null;
      // 删除临时文件
      file.delete();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (br != null) {
        try {
          br.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
    return outPutResult;
  }

/**
 * 运行外部程序命令 - 带参数并规定字符解析格式
 *
 * @param args    输入参数
 * @param command   输入命令
 * @param charsetName 输出字符解析格式
 * @return
 */
public static StringBuilder runOutCmd(String command, List<String> args, String charsetName) {
  BufferedReader br = null;
  StringBuilder outPutResult = new StringBuilder();
  try {
    List<String> execCommand = new LinkedList<>();
    if (args != null) {
      execCommand.addAll(args);
    }
    execCommand.add(0, command);
    execCommand.add(0, "/c");
    execCommand.add(0, "cmd.exe");
    ProcessBuilder pb = new ProcessBuilder().command(execCommand).inheritIO();
    // 外部程序的输出放到了错误信息输出流中
    pb.redirectErrorStream(true);
    //等待语句执行完成，否则可能会读不到结果。
    Process process = pb.start();
    process.waitFor();
    InputStream inputStream = process.getInputStream();
    br = new BufferedReader(new InputStreamReader(inputStream, charsetName));
    String line;
    while ((line = br.readLine()) != null) {
      outPutResult.append(line).append("\n");
    }
    br.close();
    br = null;
  } catch (Exception e) {
    e.printStackTrace();
  } finally {
    if (br != null) {
      try {
        br.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  return outPutResult;
}

 br = new BufferedReader(new InputStreamReader(in,charsetName));