Question

这是一种伐木功能,从外部方案的实施中发现错误。一切产品都进行罚款。但是,如果没有错误数据,我不想生成逻辑框架。目前,它正在创建零规模档案。请提供帮助。

FileOutputStream fos = new FileOutputStream(logFile);
PrintWriter pw = new PrintWriter(fos);

Process proc = Runtime.getRuntime().exec(externalProgram);

InputStreamReader isr = new InputStreamReader(proc.getErrorStream());
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
{
   if (pw != null){
      pw.println(line);
      pw.flush(); 
   }
}

谢谢。

Answer 1

简单地推迟制定<代码> 文件:

PrintWriter pw = null;

Process proc = Runtime.getRuntime().exec(externalProgram);

InputStreamReader isr = new InputStreamReader(proc.getErrorStream());
BufferedReader br = new BufferedReader(isr);
String line;
while ( (line = br.readLine()) != null)
{
   if (pw == null)
   {
      pw = new PrintWriter(new FileOutputStream(logFile));
   }
   pw.println(line);
   pw.flush(); 
}

个人而言,I m 不是PrintWriter的大扇,它只是吞.了所有的例外情况。我也使用<代码>OutputStreamWriter,以便你能够明确指明编码。不管怎么说,这从这里的真正问题 aside开。

Answer 2

改变现状是显而易见的。

FileOutputStream fos = new FileOutputStream(logFile);
PrintWriter pw = new PrintWriter(fos);
....
   if (pw != null){
   ...
   }

纽约总部

FileOutputStream rawLog = null;
try {
    PrintWriter Log = null;
    ....
       if (log == null) {
           rawLog = new FileOutputStream(logFile);
           log = new PrintWriter(log, "UTF-8");
       }
       ...
} finally {
    // Thou shalt close thy resources.
    // Icky null check - might want 纽约总部 split this using the Execute Around idiom.
    if (rawLog != null) {
        rawLog.close();
    }
}

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