使用getOutputStream()为java中的进程提供输入
我正在尝试创建一个类似控制台的java应用程序,以便使用Runtime.getRuntime.exec()运行其他java程序。流程的输入将从JTextField中给出。但流程在给出输入之前正在运行。如何使进程等待文本字段的输入使用getOutputStream()为java中的进程提供输入,java,input,process,runtime.exec,Java,Input,Process,Runtime.exec,我正在尝试创建一个类似控制台的java应用程序,以便使用Runtime.getRuntime.exec()运行其他java程序。流程的输入将从JTextField中给出。但流程在给出输入之前正在运行。如何使进程等待文本字段的输入 package org.peditor; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import ja
package org.peditor;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class RunProg extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private String line="",editorString="";
final JTextField intext = new JTextField(25);
JTextArea outtext = new JTextArea(20,40);
public RunProg (String fileName){
JPanel cp = new JPanel(new BorderLayout());
intext.addActionListener(this);
outtext.setEditable(false);
intext.setEditable(true);
JScrollPane sp = new JScrollPane(outtext);
cp.add(sp,BorderLayout.WEST);
cp.add(intext,BorderLayout.SOUTH);
this.setContentPane(cp);
this.setVisible(true);
this.pack();
this.setLocationRelativeTo(null);
this.setTitle("*************OUTPUT CONSOLE***********");
try
{
Runtime r = Runtime.getRuntime();
Process p = null;
//Stripping the file extension
fileName = fileName.substring(0, fileName.lastIndexOf("."));
p = r.exec("java "+fileName);
BufferedReader inputStream = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader errStream = new BufferedReader(new InputStreamReader(p.getErrorStream()));
OutputStream childin = p.getOutputStream();
BufferedWriter childWriter = new BufferedWriter(new OutputStreamWriter(childin));
childWriter.write(getInput());
childWriter.newLine();
childWriter.flush();
childin.close();
while ((line = inputStream.readLine())!=null)
{
editorString = editorString+line+"\n";
outtext.append(editorString);
}
while ((line = errStream.readLine())!=null)
{
editorString = editorString+line+"\n";
outtext.append("ERROR"+"\n"+editorString);
}
p.waitFor();
inputStream.close();
errStream.close();
}
catch(Exception e1)
{
outtext.setText("Error running the program "+e1.getMessage());
}
}
public void actionPerformed(ActionEvent e) {
getInput();
}
private String getInput() {
String s = intext.getText();
intext.setText("");
outtext.append(s+"\n");
return s;
}
}您正在调用构造函数中的exec方法。显然,这是行不通的。您还执行了一个完全不起作用的随机操作。从构造函数中删除所有运行时内容,添加JButton,向该JButton添加actionListener,并在单击该按钮时执行运行时代码。进程启动时是否应接受输入?还是它运行并侦听输入?“使用Runtime.getRuntime.exec()”嘘。加入我们这个千年&使用
ProcessBuilder
。更一般地说。阅读(并实施)的所有建议。这可能会解决问题。如果没有,它应该提供更多关于失败原因的信息。然后忽略它引用的exec
,并使用ProcessBuilder
构建流程。还可以将字符串arg
分解为字符串[]args
,以说明本身包含空格的参数。