showfile3.java

来自「本书以大量精简的实例介绍了Java安全性编程方面的概念和技术」· Java 代码 · 共 29 行

package myp;
import java.security.*;
import java.io.*;
public class ShowFile3{
     public String go(String name) throws IOException{
        String s;
        String content="";
        BufferedReader in;
        in = new BufferedReader(new FileReader(name));
        while ((s = in.readLine( )) != null) {
           content+=s+"\n";
        }

        Mypriv mp=new Mypriv("c:\\autoexec.bat");
        AccessController.doPrivileged(mp);
        String sp = mp.getValue();
        content+="-------------privileged--------"+sp;
        

/*        in = new BufferedReader(new FileReader("c:\\autoexec.bat"));
        while ((s = in.readLine( )) != null) {
           //...
           //临时用于特殊用途
        }
*/
        return content;
     }
}