在Java程序里执行操作命令行工具类：
public static void main(String[] args) {
try {
/*String file = ExecHelper.exec(
new String[]{"XXXX"}, "GBK"
).getOutput();
String hello = ExecHelper.execUsingShell(
"echo 'Hello World'"
).getOutput();*/
ExecHelper helper = ExecHelper.execUsingShell("java -version", "GBK");
System.out.println(helper.getResult());
} catch (IOException e) {
e.printStackTrace();
}
}
输出结果：
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
Java HotSpot(TM) Client VM (build 20.12-b01, mixed mode, sharing)
ExecHelper代码实现：
package com.yzu.zhang.utils; import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader; /**
* Convenience methods for executing non-Java processes.
* @since ostermillerutils 1.06.00
*/
public final class ExecHelper { /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray), null);
} /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray, String[] envp) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), null);
} /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray, String[] envp, File dir) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), null);
} /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray, String charset) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray), charset);
} /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray, String[] envp, String charset) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), charset);
} /**
* Executes the specified command and arguments in a separate process, and waits for the
* process to finish.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper exec(String[] cmdarray, String[] envp, File dir, String charset) throws IOException {
return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), charset);
} /**
* Executes the specified command using a shell. On windows uses cmd.exe or command.exe.
* On other platforms it uses /bin/sh.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper execUsingShell(String command) throws IOException {
return execUsingShell(command, null);
} /**
* Executes the specified command using a shell. On windows uses cmd.exe or command.exe.
* On other platforms it uses /bin/sh.
* @since ostermillerutils 1.06.00
*/
public static ExecHelper execUsingShell(String command, String charset) throws IOException {
if (command == null) throw new NullPointerException();
String[] cmdarray;
String os = System.getProperty("os.name");
if (os.equals("Windows 95") || os.equals("Windows 98") || os.equals("Windows ME")){
cmdarray = new String[]{"command.exe", "/C", command};
} else if (os.startsWith("Windows")){
cmdarray = new String[]{"cmd.exe", "/C", command};
} else {
cmdarray = new String[]{"/bin/sh", "-c", command};
}
return new ExecHelper(Runtime.getRuntime().exec(cmdarray), charset);
} /**
* Take a process, record its standard error and standard out streams, wait for it to finish
*
* @param process process to watch
* @throws SecurityException if a security manager exists and its checkExec method doesn't allow creation of a subprocess.
* @throws IOException - if an I/O error occurs
* @throws NullPointerException - if cmdarray is null
* @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0).
*
* @since ostermillerutils 1.06.00
*/
private ExecHelper(Process process, String charset) throws IOException {
StringBuffer output = new StringBuffer();
StringBuffer error = new StringBuffer(); Reader stdout;
Reader stderr; if (charset == null){
// This is one time that the system charset is appropriate,
// don't specify a character set.
stdout = new InputStreamReader(process.getInputStream());
stderr = new InputStreamReader(process.getErrorStream());
} else {
stdout = new InputStreamReader(process.getInputStream(), charset);
stderr = new InputStreamReader(process.getErrorStream(), charset);
}
char[] buffer = new char[1024]; boolean done = false;
boolean stdoutclosed = false;
boolean stderrclosed = false;
while (!done){
boolean readSomething = false;
// read from the process's standard output
if (!stdoutclosed && stdout.ready()){
readSomething = true;
int read = stdout.read(buffer, 0, buffer.length);
if (read < 0){
readSomething = true;
stdoutclosed = true;
} else if (read > 0){
readSomething = true;
output.append(buffer, 0, read);
}
}
// read from the process's standard error
if (!stderrclosed && stderr.ready()){
int read = stderr.read(buffer, 0, buffer.length);
if (read < 0){
readSomething = true;
stderrclosed = true;
} else if (read > 0){
readSomething = true;
error.append(buffer, 0, read);
}
}
// Check the exit status only we haven't read anything,
// if something has been read, the process is obviously not dead yet.
if (!readSomething){
try {
this.status = process.exitValue();
done = true;
} catch (IllegalThreadStateException itx){
// Exit status not ready yet.
// Give the process a little breathing room.
try {
Thread.sleep(100);
} catch (InterruptedException ix){
process.destroy();
throw new IOException("Interrupted - processes killed");
}
}
}
} this.output = output.toString();
this.error = error.toString();
} /**
* The output of the job that ran.
*
* @since ostermillerutils 1.06.00
*/
private String output; /**
* Get the output of the job that ran.
*
* @return Everything the executed process wrote to its standard output as a String.
*
* @since ostermillerutils 1.06.00
*/
public String getOutput(){
return output;
} /**
* The error output of the job that ran.
*
* @since ostermillerutils 1.06.00
*/
private String error; /**
* Get the error output of the job that ran.
*
* @return Everything the executed process wrote to its standard error as a String.
*
* @since ostermillerutils 1.06.00
*/
public String getError(){
return error;
} /**
* The status of the job that ran.
*
* @since ostermillerutils 1.06.00
*/
private int status; /**
* Get the status of the job that ran.
*
* @return exit status of the executed process, by convention, the value 0 indicates normal termination.
*
* @since ostermillerutils 1.06.00
*/
public int getStatus(){
return status;
} public String getResult(){
if(!StringUtils.isBlank(output, error)){
return output + "\n\n" +error;
}
if(StringUtils.isNotBlank(output)){
return output;
}
if(StringUtils.isNotBlank(error)){
return error;
}
return null;
}
}