启动一个进程管道输入输出

见下面

import java.io.OutputStream ;
import java.io.InputStream ;
import java.io.OutputStreamWriter ;
import java.io.InputStreamReader ;
import java.io.BufferedReader ;
import java.io.BufferedWriter ;
import java.io.IOException ;

class TestRuntime {

    public static void main( String[] args ) {

        Runtime runtime = Runtime.getRuntime() ;

        try {
            Process proc = runtime.exec( "dot -Tps" ) ;
            OutputStream out = proc.getOutputStream() ;
            InputStream in = proc.getInputStream() ;

            BufferedWriter writer = new BufferedWriter( new OutputStreamWriter( out ) ) ;
            writer.write( "digraph { A->B; B ->C ; A->C }" ) ;
            writer.close() ;

            BufferedReader reader = new BufferedReader( new InputStreamReader( in )  ) ;
            String line = null ;
            while( null != ( line = reader.readLine() ) )
                System.out.println( line ) ;
        } catch( IOException e ) {
            System.exit(1) ;
        }

    }
}

这里以 dot 为例，向其发送一个 digraph 然后输出为一个 ps 文件。