求教，在JSP里能调用其它的应用程序吗，比如说C写的程序，如果能，被调用的程序怎么返回结果给JSP，在线急，，，谢谢。

Question

Runtime rt= Runtime.getRuntime() ;
      Process p=rt.exec("add ur command line here") ;
      p.waitFor() ;
      int return_value =p.exitValue() ;

Answer 1

gary_shi(Gary Shi)兄：
怎么没有反应啊。

Answer 2

我运行了我的程序，具体如下int staff_id;
String passwd;
int    count=0;
staff_id=Integer.parseInt(request.getParameter("acc_nbr"));
passwd=request.getParameter("passwd");
      Runtime rt= Runtime.getRuntime() ;
      Process p=rt.exec("/www/htdocs/netoffice/check "+staff_id+" "+passwd) ;
      p.waitFor() ;
      int return_value =p.exitValue() ;
  if (return_value!=0)
  {
  System.out.println("密码错误!");
  return;
  }可是什么都没有，既没有进入正常页面，也没有出现"密码错误"的提示。我的操作系统是Linux;

Answer 3

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int staff_id;
String passwd;
int    count=0;
staff_id=Integer.parseInt(request.getParameter("acc_nbr"));
passwd=request.getParameter("passwd");
      Runtime rt= Runtime.getRuntime() ;
      Process p=rt.exec("/www/htdocs/netoffice/check "+staff_id+" "+passwd) ;
      
      CheckStream csin = new CheckStream(p.getInputStream());
      CheckStream cserr = new CheckStream(proInstall.getErrorStream());
      csin.start();
      cserr.start();
      
      p.waitFor() ;
      proInstall.destroy();
      
      int return_value =p.exitValue() ;
  if (return_value!=0)
  {
  System.out.println("ÃÜÂë´íÎó!");
  return;
  }
  /**
   * Êä³ö¿ØÖÆ̨ÐÅÏ¢µÄÏß³Ì
   */
  class CheckStream extends Thread{    BufferedReader bufferedReader;
    String lineRead = "";    /**
     * Constructor needs an InputStream to form an anonymous
     * InputStreamReader which is used to create a BufferedReader
     * for reading the stream.
     */
    CheckStream(InputStream is){
      this.bufferedReader = new BufferedReader(new InputStreamReader(is));
    }    public void run(){
      try{
        while ((lineRead = bufferedReader.readLine()) != null){
          showProcessInfo(lineRead);
        }
      }catch(Exception ioe){
      }
    }
  }

Answer 4

对不起，出现乱码！
可能是由于你的C程序输出的控制台信息，试试下面的代码int staff_id;
String passwd;
int    count=0;
staff_id=Integer.parseInt(request.getParameter("acc_nbr"));
passwd=request.getParameter("passwd");
      Runtime rt= Runtime.getRuntime() ;
      Process p=rt.exec("/www/htdocs/netoffice/check "+staff_id+" "+passwd) ;
      
      CheckStream csin = new CheckStream(p.getInputStream());
      CheckStream cserr = new CheckStream(proInstall.getErrorStream());
      csin.start();
      cserr.start();
      
      p.waitFor() ;
      proInstall.destroy();
      
      int return_value =p.exitValue() ;
  if (return_value!=0)
  {
  System.out.println("ÃÜÂë´íÎó!");
  return;
  }
  /**
   * 输出控制台信息的线程
   */
  class CheckStream extends Thread{    BufferedReader bufferedReader;
    String lineRead = "";    /**
     * Constructor needs an InputStream to form an anonymous
     * InputStreamReader which is used to create a BufferedReader
     * for reading the stream.
     */
    CheckStream(InputStream is){
      this.bufferedReader = new BufferedReader(new InputStreamReader(is));
    }    public void run(){
      try{
        while ((lineRead = bufferedReader.readLine()) != null){
          showProcessInfo(lineRead);
        }
      }catch(Exception ioe){
      }
    }
  }

Answer 5

org.apache.jasper.JasperException: Unable to compile class for JSP/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:59: Class BufferedReader not found.
                    BufferedReader bufferedReader;
                                                 ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:67: Class InputStream not found.
                    CheckStream(InputStream is){
                    ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:68: Class BufferedReader not found.
                      this.bufferedReader = new BufferedReader(new InputStreamReader(is));
                                                ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:73: Class BufferedReader not found in void run().
                        while ((lineRead = bufferedReader.readLine()) != null){
                                                                  ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:74: Method showProcessInfo(java.lang.String) not found in local class CheckStream (_0002foffice_0002ejspoffice_jsp_37. 1$CheckStream).
                          showProcessInfo(lineRead);
                                         ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:95: Class InputStream not found in new.
                      CheckStream csin = new CheckStream(p.getInputStream());
                                         ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:96: Undefined variable or class name: proInstall
                      CheckStream cserr = new CheckStream(proInstall.getErrorStream());
                                                          ^
/usr/local/jakarta-tomcat/work/localhost_8080%2Fnetoffice/_0002foffice_0002ejspoffice_jsp_37.java:101: Undefined variable or class name: proInstall
                      proInstall.destroy();
                      
错误更多了

Answer 6

CheckStream类需要编译后放到/WEB-INF/classes下，
java.io.BufferedReader需要引用
proInstall 改为 p
showProcessInfo() 去掉
你的问题最可能的原因就是由于你的C程序输出的控制台信息!

Answer 7

请参考
http://www.powerba.com/develop/web/java/article/20010630001.htm