[英]Could not run another java programs from ProcessBuilder?
TestClass.java TestClass.java
package test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class TestClass {
public static void main(String[] args) throws IOException {
System.out.println("inside");
ProcessBuilder pb = new ProcessBuilder("java", "-cp", "", "test.OtherClass");
Process p = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getErrorStream()));
StringBuilder builder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
builder.append(line);
builder.append(System.getProperty("line.separator"));
}
String result = builder.toString();
System.out.println(result);
}
}
OtherClass.java OtherClass.java
package test;
public class OtherClass {
public static void main(String ar[]) {
System.out.println("Hello Amit!");
}
}
I am trying to run OtherClass from TestClass, but I am not able to do it. 我正在尝试从TestClass运行OtherClass,但是我无法做到这一点。 Running TestClass just prints "inside". 运行TestClass只会打印“内部”。 I am not getting any exception and I am clueless right now. 我没有任何例外,我现在一无所知。 I am implementing ProcessBuilder for the first time. 我是第一次实现ProcessBuilder。
NOTE: I was able to run simple program using ProcessBuilder. 注意:我能够使用ProcessBuilder运行简单的程序。 Also Can you tell what is meaning of -cp
; 还可以告诉-cp
是什么意思吗? I googled a lot but could not find its meaning. 我在Google上搜索了很多,但找不到它的含义。
EDIT: 编辑:
I have updated code and now I am getting 我已经更新了代码,现在我得到了
inside
Error: Could not find or load main class test.OtherClass
Thanks! 谢谢!
Its likely to be the classpath. 它可能是类路径。 Assuming you have a directory called test, Have you tried something like: 假设您有一个名为test的目录,是否尝试过类似的操作:
ProcessBuilder pb = new ProcessBuilder("java", "-cp", ".", "test.OtherClass");
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