如何搜索文件并获取所需字段？

Question

Java 新手。现在我正在尝试打开、读取和搜索文件，但 Eclipse 给了我一个错误。这是我的代码：

import java.io.*;

class Test2 {
  public static void main(String[] args) {
    try {            
      BufferedReader doc = new BufferedReader(new FileReader("E:\\Grad\\Project\\test.csv"));
      /* String userInput;    */
      String docCont = new String();
      while ((docCont = doc.readLine()) != null) {
        System.out.println(docCont);
        doc.close();
      }
    } catch(IOException ie) {
      ie.printStackTrace();
    }
  }
}   

代码可以编译，但是当我尝试运行它时，我得到了这个：

A fatal error has been detected by the Java Runtime Environment:

Internal Error (javaClasses.cpp:136), pid=5036, tid=4704
fatal error: Invalid layout of preloaded class

JRE version:  (7.0_67-b01) (build )
Java VM: Java HotSpot(TM) Client VM (24.65-b04 mixed mode windows-x86 )
Failed to write core dump. Minidumps are not enabled by default on client versions of Windows

An error report file with more information is saved as:
C:\Users\ximinmi\workspace\OldImageReveal\hs_err_pid5036.log

If you would like to submit a bug report, please visit:
  http://bugreport.sun.com/bugreport/crash.jsp

知道这是关于什么的吗？谢谢。

Answer 1

您的 close 语句在您的 while 循环中，因此在第一次迭代时，您将无法再从您的阅读器中读取。改为这样写：

BufferedReader doc = new BufferedReader(new FileReader("E:\\Grad\\Project\\test.csv"));
String docCont = new String();
while ((docCont = doc.readLine()) != null) {
    System.out.println(docCont);
}
doc.close();