我想在项目中的确切要求,它可以完成任务和服务。你只需要一个正确的实现。
注意事项:
1.始终使用service或Platform.runLater启动后台任务。
2.如果要更新UI,必须从任务或服务完成。
3.将任务的进度属性绑定到进度条的进度条,以便平滑更新。
4.同样将Label的文本属性绑定到任务的消息属性,以平滑更新状态或其他内容。
要执行外部命令状外壳等我写了下面的类:
package utils;
import controller.ProgressController;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.concurrent.Task;
import main.Installer;
public class ProcessExecutor extends Task<Integer>
{
Logger logger =Logger.getLogger("ProcessExecutor");
File dir;
String []cmd;
String cmds;
int exitCode=-1;
boolean NextStepExists=false;
Task nextStep;
public ProcessExecutor(String...cmd)
{
this.cmd=cmd;
this.dir=new File(System.getProperty("user.dir"));
this.nextStep=null;
NextStepExists=false;
}
public ProcessExecutor(Task nextStep,String...cmd)
{
this.cmd=cmd;
this.dir=new File(System.getProperty("user.dir"));
this.nextStep=nextStep;
NextStepExists=true;
}
public ProcessExecutor(Task nextStep,File dir,String...cmd)
{
this.cmd=cmd;
this.dir=dir;
this.nextStep=nextStep;
NextStepExists=true;
}
@Override
protected final Integer call()
{
cmds=new String();
for(String i:cmd)
cmds+=i+" "; // just to log cmd array
try
{
logger.info("Starting new process with cmd > "+cmds);
ProcessBuilder processBuilder=new ProcessBuilder(cmd);
processBuilder.directory(dir);
processBuilder.redirectErrorStream(true);
Map<String, String> env = processBuilder.environment();
// create custom environment
env.put("JAVA_HOME", "/opt/jdk1.7.0_45/");
Process pr=processBuilder.start();
BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line = in.readLine();
while (line != null) {
logger.log(Level.FINE,line);
ProgressController.instance.printToConsole(line);
line = in.readLine();
}
BufferedReader er = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
String erLine = in.readLine();
while (erLine != null) {
logger.log(Level.FINE,erLine);
ProgressController.instance.printToConsole(erLine);
erLine = in.readLine();
}
exitCode=pr.waitFor();
exitCode=pr.exitValue();
logger.info("Exit Value="+exitCode);
updateMessage("Completed Process");
if(exitCode!=0 && exitCode!=1)
{
logger.info("Failed to execute process commands >"+cmds+" with exit code="+exitCode);
failed();
}
else
{
logger.info("PE succeeded()");
if(NextStepExists)
Installer.pool.submit(nextStep);
succeeded();
}
}
catch(Exception e)
{
logger.log(Level.SEVERE,"Exception: Failed to execute process commands >"+cmds,e);
updateMessage(e.getMessage());
}
return new Integer(exitCode);
}
@Override
public void failed()
{
super.failed();
logger.log(Level.SEVERE,"Failed to execute process commands >"+cmds+"; ExitCode="+exitCode);
}
}
此类使用的ProcessBuilder为新的过程中创建所需的环境,
它等待执行完成进程使用process.waitFor(),
进程的目录可以使用processBuilder.directory(dir)进行设置。
为了在任何时候执行一个任务<>,使用java.util.concurrent.ExecutorService中
public ExecutorService pool=Executors.newSingleThreadExecutor();
pool.submit(new ProcessExecutor("installTomcat.bat","tomcat7"));
pool.submit(new ProcessExecutor("installPostgres.bat","postgresql","5432"));
通过这种方式,你可以执行批处理文件一个接一个。
Executors.newSingleThreadExecutor()负责随时执行单个任务并对新提交的任务进行排队。
我已经写了一个顺序执行的通用工作示例:
github
这是一个NetBeans JavaFX项目及其广义的&精简版项目。
希望这有助于
看看顺序执行示例:[如何重置JavaFX2中任务之间的进度指示器?](http://stackoverflow.com/questions/16368793/how-to-reset-progress-指示器之间的任务功能于javafx2) – jewelsea