java执行cmd命令工具实现

public String runCommands(String cmds){

String str = "";
String errStr = "";
String charset = Charset.defaultCharset().toString();
try {
Process p = Runtime.getRuntime().exec(cmds);
InputStream err = p.getErrorStream();
InputStream in = p.getInputStream();
str = processStdout(in, charset);
errStr = processStdout(err, charset);
if(!StringUtils.isEmpty(errStr)){
return str+errStr;
}
} catch (IOException e) {
errStr = e.getMessage();
return errStr;
}
return str;

}

public String runCommands(String[] cmd){

String str = "";
String errStr = "";
String charset = Charset.defaultCharset().toString();
try {
Process p = Runtime.getRuntime().exec(cmd);
InputStream err = p.getErrorStream();
InputStream in = p.getInputStream();
str = processStdout(in, charset);
errStr = processStdout(err, charset);
if(!StringUtils.isEmpty(errStr)){
return str+errStr;
}
} catch (IOException e) {
errStr = e.getMessage();
return errStr;
}
return str;

}

public String processStdout(InputStream in, String charset) throws IOException {
String s = "";
String str = "";
InputStreamReader insr = new InputStreamReader(in);
BufferedReader buffer = new BufferedReader(insr);
try {
while ((s=buffer.readLine())!= null){
if(StringUtil.isEmpty(str)){
str = str+s;
}else{
str = "\n"+str+s;
}
}
} catch (IOException e) {
throw e;
} finally {
buffer.close();
insr.close();
}

return str;
}