关键词：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
/**
* A simplified version of CSV Reader.
*
* Subclass of a BufferedReader to handle a character stream that consists of
* comma separated values (CSVs)
*
* Provides an additional instance method, readCSVLine(), that parses lines into
* substrings. The substrings are separated by comma in the original input
* stream. The readCSVLine() method returns an array of references to Strings.
* The Strings are the values from the line that were separated by commas. If a
* value was surrounded by quotes, the quotes are removed.
*
* Limitations: Spaces before or after the commas are not removed. In the first
* and last quote are removed from a value. Embedding commas in a quoted value
* is not handled properly. (In this case, the commas will separate the values
* and the quotes will not be removed from the ends of those values.
*
* @author Jeffrey Eppinger (jle@cs.cmu.com)
* Date: October 2, 2007
*/
public class CSVReader extends BufferedReader
/**
* Initializes the class.
* @param in the reader from which to read CSV lines
*/
public CSVReader(Reader in)
super(in);
/**
* This is the only additional method. It uses readLine from the superclass
* to get a line but returns the comma separated values as in an array of
* strings.
* @return an array of Strings containing the values At the end of the file,
* readCSVLine returns null (just as readLine does).
* @throws IOException throws IOException
*/
public String[] readCSVLine() throws IOException
// Get a line by calling the superclass's readLine method
String line = super.readLine();
// If we're at the end of the file, readLine returns null
// so we return null.
if (line == null)
return null;
// Count up the number of commas
int commaCount = 0;
for (int i = 0; i < line.length(); i++)
if (line.charAt(i) == ',')
commaCount = commaCount + 1;
// Allocate an array of the necessary size to return the strings
String[] values = new String[commaCount + 1];
// In a loop, set beginIndex and endIndex to the start and end
// positions of each argment and then use the substring method
// to create strings for each of the comma separate values
// Start beginIndex at the beginning of the String, position 0
int beginIndex = 0;
for (int i = 0; i < commaCount; i++)
// set endIndex to the position of the (next) comma
int endIndex = line.indexOf(',', beginIndex);
// if the argument begins and ends with quotes, remove them
if (line.charAt(beginIndex) == '"' && line.charAt(endIndex - 1) == '"')
// If we made it here, we have quotes around our string.
// Add/substract one from the start/end of the args
// to substring to get the value. (See else comment
// below for details on how this works.)
values[i] = line.substring(beginIndex + 1, endIndex - 1);
else
// If we name it here, we don't have quotes around
// our string. Take the substring of this line
// from the beginIndex to the endIndex. The substring
// method called on a String will return the portion
// of the String starting with the beginIndex and up
// to but not including the endIndex.
values[i] = line.substring(beginIndex, endIndex);
// Set beginIndex to the position character after the
// comma. (Remember, endIndex was set to the position
// of the comma.)
beginIndex = endIndex + 1;
// handle the value that's after the last comma
if (line.charAt(beginIndex) == '"' && line.charAt(line.length() - 1) == '"')
values[commaCount] = line.substring(beginIndex + 1, line.length() - 1);
else
values[commaCount] = line.substring(beginIndex, line.length());
return values;
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