java程序执行linux命令

绝地灬酷狼 2023-07-01 05:23 13阅读 0赞

因某些情况下需要调用Java程序执行Linux命令，过程中有写坑，记录下：

@Slf4j
    public class CommandUtil {
        public static Result<Boolean> run(List<String> commandArr){
            File wd = new File("/bin");
            Process proc = null;
            try {
                proc = Runtime.getRuntime().exec("/bin/bash", null, wd);
            } catch (IOException e) {
                log.error("CommandUtil.run IOException",e);
                return CommonError.SERVICE_ERROR.toResult(e.getLocalizedMessage());
            }
    
            if (proc != null) {
                try (BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
                     PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(proc.getOutputStream())), true)) {
                    for (String command : commandArr) {
                        out.println(command);
                    }
                    out.println("echo ready exit");
                    out.println("exit");
    
                    String result;
                    while ((result = in.readLine()) != null) {
                        log.info("command exec result:{}", result);
                    }
                } catch (Exception e) {
                    log.error("CommandUtil.run Exception", e);
                    return CommonError.SERVICE_ERROR.toResult(e.getLocalizedMessage());
                } finally {
                    proc.destroy();
                }
                return Result.successResult(true);
            }else {
                return CommonError.SERVICE_ERROR.toResult("Process is null");
            }
        }
    }

工具类调用示例：

List<String> commandArr = new ArrayList();
            commandArr.add("cd " + projectRootPath);
            commandArr.add("pwd");
            commandArr.add("cd target/classes");
            commandArr.add("pwd");
            commandArr.add("jar -cvf " + jarOutPathName + " " + jarClassPathName);
            commandArr.add("echo jar update");
            commandArr.add("jar -uvf " + jarOutPathName + " " + jarClassPathName);
            log.info(JSON.toJSONString(commandArr));
            return CommandUtil.run(commandArr);

踩过的坑如下：  
上述工具类是打开一个命令行窗口，可执行linux命令cd，用其它方式调用执行cd命令，会出错，异常如下：

java.io.IOException: Cannot run program "cd": java.io.IOException: error=2, No such file or directory