写一段java程序来执行linux命令
摘要
在日常开发中,程序员需要经常查询服务器日志来排查问题和调试程序。如果是本地调试还好,但项目一旦发布到服务器上,每次查日志就很麻烦,而且日志量巨大,有时我们无法找到我们需要的信息。经常需要借助第三方工具来执行此类操作。那么我们可不可以在编辑器上运行代码就能完成相应的操作呢?
答案是肯定的!经过研究与测试,我总结了以下的方法,调用次服务就能执行相应的linux命令,无需麻烦借用第三方工具了,在同一个开发工具上就能完成所有的操作。接下来看看代码吧!
程序代码
一、写一个对外提供的services(ReadLogServlet)
public class ReadLogServletextends SlingAllMethodsServlet {
private static final LoggerLOG = LoggerFactory.getLogger(ReadLogServlet.class);
@Override
protected void doPost(final SlingHttpServletRequest request,
final SlingHttpServletResponse response)throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("application/json;charset=utf-8;");
String jsonStr = HttpRequestUtil.getRequestJson(request);
try {
JSONObject jsonObject =new JSONObject(jsonStr);
String commond = jsonObject.getString("command");
String result = executeLinuxCmd(commond);
if (result ==null) {
LOG.error("result null");
return;
}
try (PrintWriter printWriter = response.getWriter()) {
printWriter.write(result);
response.flushBuffer();
}catch (IOException e) {
LOG.error("Response writer error:" + e.toString());
}
}catch (JSONException e) {
}catch (IOException io){
try (PrintWriter printWriter = response.getWriter()) {
printWriter.write(io.getMessage());
response.flushBuffer();
}catch (IOException e) {
LOG.error("Response writer error:" + e.toString());
}
}
}
//核心代码
public String executeLinuxCmd(String cmd)throws IOException {
//System.out.println("got cmd job : " + cmd);
Runtime run = Runtime.getRuntime();
// Process process = run.exec(cmd);
Process process = run.exec(new String[]{"/bin/sh","-c", cmd});
InputStream in = process.getInputStream();
BufferedReader bs =new BufferedReader(new InputStreamReader(in));
//List list = new ArrayList();
StringBuffer sf =new StringBuffer();
String result =null;
while ((result = bs.readLine()) !=null) {
//System.out.println("job result [" + result + "]");
//list.add(result);
sf.append(result);
sf.append("\n");
}
in.close();
// process.waitFor();
process.destroy();
return sf.toString();
}
}
二、使用postman调用ReadLogServlet(使用其他工具调用也可)
总结:
除了查询日志外,还可执行其他linux命令。大家可继续优化发掘,如果有更好的意见和技术,欢迎留言探讨哦!