使用Java操作CSV文件

网上找了个开源实现，用用还不错。因为项目中经常要用到，而我又很容易忘记。为了节省今后使用时到网上漫天寻找的时间，我决定在这做个笔记。

CSV读写开源实现主页：http://opencsv.sourceforge.net
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;

import au.com.bytecode.opencsv.CSVReader;
import au.com.bytecode.opencsv.CSVWriter;
import au.com.bytecode.opencsv.bean.ColumnPositionMappingStrategy;
import au.com.bytecode.opencsv.bean.CsvToBean;

public class CsvDemo {

public static void main(String[] args) throws IOException {

final String[] header = new String[]{"name", "sex", "age"};
final String[][] data = new String[][]{header, {"Lucy", "F", "22"}, {"Tom", "M", "25"}, {"Lily", "F", "19"}};

File tempFile = File.createTempFile("csvWriterTest", ".csv");
tempFile.deleteOnExit();

CSVWriter writer = new CSVWriter(new FileWriter(tempFile));
for (int i = 0; i < data.length; i++) {
writer.writeNext(data[i]);
}
writer.close();

CSVReader reader = new CSVReader(new FileReader(tempFile));
String[] line;
String readline = "";
for (int row = 0; (line = reader.readNext()) != null; row++) {
for (int col = 0; col < line.length; col++) {
if (data[row][col] != null) {
System.out.print(line[col] + (col != line.length - 1 ? "," : ""));
readline = readline + line[col] + (col != line.length - 1 ? "," : " ");
}
}
System.out.println("");
}

ColumnPositionMappingStrategy strat = new ColumnPositionMappingStrategy();
strat.setType(Person.class);
String[] columns = new String[] {"name", "sex", "age"};
strat.setColumnMapping(columns);
CsvToBean csv = new CsvToBean();
List<?> persons = csv.parse(strat, new StringReader(readline));
for (int i = 1; i < persons.size(); i++) {
System.out.println(((Person)persons.get(i)).getName());
System.out.println(((Person)persons.get(i)).getSex());
System.out.println(((Person)persons.get(i)).getAge());
}

reader.close();
}
}

这是另一个开源实现：http://sourceforge.net/projects/javacsv/

测试代码是网上考来的。因为用的日文系统，下面解析csv文件时使用了shift_jis编码方式。
import java.awt.Dimension;
import java.awt.GridLayout;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;

import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class CSVReaderDemo extends JPanel{

private String filePath = "d://sample.csv";

public CSVReaderDemo() {
super(new GridLayout(1,0));
try {
CsvReader reader = new CsvReader(filePath,',',Charset.forName("shift_jis"));
reader.readHeaders();
String[] headers = reader.getHeaders();
//int headerCount = reader.getHeaderCount();
//int col = reader.getColumnCount();
List<Object[]> list = new ArrayList<Object[]>();
while(reader.readRecord()) list.add(reader.getValues());
Object[][] data = new String[list.size()][];
for(int i=0; i<list.size(); i++) data[i] = list.get(i);
final JTable table = new JTable(data, headers);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
//table.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
} catch (Exception ex) {
ex.printStackTrace();
}
}

private static void createAndShowGUI(){
JFrame frame = new JFrame("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
CSVReaderDemo newContentPane = new CSVReaderDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}

public static void main(String[] args){
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

该文章转载自网络大本营：http://www.xrss.cn/Dev/JAVA/200811618518.Html

附在：http://blog.csdn.net/lord_is_layuping/archive/2008/02/14/2095766.aspx