Question

java.io.IOException: Cannot run program "echo": CreateProcess error=2, ?????????

public void callCmd() {
String fileName = "a.txt";
String splicing = "hahahahha";
//将异常数据同时打印到控制台上
System.out.println("echo "+ splicing +" >> ./"+fileName);
//System.out.println(splicing());
Runtime runtime=Runtime.getRuntime();
try{
Process process = runtime.exec("echo "+ splicing +" >> ./"+fileName);
InputStream in = process.getInputStream();
while (in.read() != -1) {
System.out.println(in.read());
}
in.close();
process.waitFor();
}catch(Exception e){
System.out.println("写入到文件"+fileName+"失败！");
e.printStackTrace();
}
}

控制台输出：
echo hahahahha >> ./a.txt

复制后在cmd中能正常执行。说明语句应该是没错的。
求大神指导！
报错消息(部分)：
java.io.IOException: Cannot run program "echo": CreateProcess error=2, ?????????
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
....
Caused by: java.io.IOException: CreateProcess error=2, ?????????
at java.lang.ProcessImpl.create(Native Method)

Answer 1

Process process = runtime.exec("cmd echo " + splicing + " >> ./" + fileName);
echo 是cmd 命令
添加执行命令的程序就行了

追问

谢谢您的帮助，但是仍旧失败。可否再看一下

追答

mac os 的话应该是console, 我在windows上是可以的