按行读取文件内容的错误?
String sline="";
File file = new File("c:\\ini.txt");
FileInputStream fins=null;
BufferedInputStream bins=null;
DataInputStream dins=null;//--------------------
fins = new FileInputStream(file);
bins = new BufferedInputStream(fins);
dins = new DataInputStream(dins);
try{
while( (sline = dins.readLine()).length() != 0 )
out.print(sline); }
catch(Exception e) {e.printStackTrace();out.print("readall failure失败");}
out.print("-------------end-------------");
总报告说java.lang.NullPointer