Java读写CSV格式文件（opencsv）

使用opencsv(opencsv-2.3.jar)，下载地址：http://download.csdn.net/detail/jinwufeiyang/9664120

一，读取CSV格式文件：

import java.io.File;
import java.io.FileReader;
import java.util.List;

import au.com.bytecode.opencsv.CSVReader;

public class ReadCSV {
public static void main(String[] args) throws Exception {
File file = new File("e:\\read.csv");
FileReader fReader = new FileReader(file);
CSVReader csvReader = new CSVReader(fReader);
String[] strs = csvReader.readNext();
if(strs != null && strs.length > 0){
for(String str : strs)
if(null != str && !str.equals(""))
System.out.print(str + " , ");
System.out.println("\n---------------");
}
List<String[]> list = csvReader.readAll();
for(String[] ss : list){
for(String s : ss)
if(null != s && !s.equals(""))
System.out.print(s + " , ");
System.out.println();
}
csvReader.close();
}
} 执行结果如下：



CSVReader.close()方法本质上是关闭传入其中的FileReader：

private BufferedReader br;

public CSVReader(Reader reader, char separator, char quotechar,
char escape, int line, boolean strictQuotes, boolean ignoreLeadingWhiteSpace) {
this.br = new BufferedReader(reader);
this.parser = new CSVParser(separator, quotechar, escape,
strictQuotes, ignoreLeadingWhiteSpace);
this.skipLines = line;
}

public void close() throws IOException{
br.close();
} 当然分隔符可以不是默认的逗号，只需在创建CSVReader时指定其分隔符即可：
CSVReader csvReader = new CSVReader(fReader, ';');
二，写CSV格式文件：
import java.io.File;
import java.io.FileWriter;
import java.io.Writer;

import au.com.bytecode.opencsv.CSVWriter;

public class WriteCSV {
public static void main(String[] args) throws Exception {
File file = new File("e:\\write.csv");
Writer writer = new FileWriter(file);
CSVWriter csvWriter = new CSVWriter(writer, ',');
String[] strs = {"abc" , "abc" , "abc"};
csvWriter.writeNext(strs);
csvWriter.close();
}
} 执行结果如下：



CSVWrite的构造方法如下：

public static final char DEFAULT_QUOTE_CHARACTER = '"';

public CSVWriter(Writer writer, char separator) {
this(writer, separator, DEFAULT_QUOTE_CHARACTER);
}
双引号被用作默认的引用符（具体什么意思不清楚）

修改一下CSVReader的初始化方式：

CSVWriter csvWriter = new CSVWriter(writer, ',' , '\\');

CSVReader中使用的是CSVParser中的静态变量：
public static final char DEFAULT_QUOTE_CHARACTER = '"';

public static final char DEFAULT_ESCAPE_CHARACTER = '\\';

但是在CSVWriter中：
public static final char DEFAULT_QUOTE_CHARACTER = '"';

public static final char DEFAULT_ESCAPE_CHARACTER = '"'; 看来应该是作者的疏忽