java 操作 csv文件

CSV是逗号分隔文件(Comma Separated Values)的首字母英文缩写，是一种用来存储数据的纯文本格式，通常用于电子表格或数据库软件。在 CSV文件中，数据“栏”以逗号分隔，可允许程序通过读取文件为数据重新创建正确的栏结构，并在每次遇到逗号时开始新的一栏。

一、利用javacsv2.0操作csv文件：

package com.iflytek.demo;  

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;  

import com.csvreader.CsvReader;
import com.csvreader.CsvWriter;  

/**
 * 利用javacsv2.0做导入导出csv文件工具类<br/>
 *
 *
 * @author kpchen
 *
 */
public class CSVUtil {  

    static char separator = ',';  

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

        // 测试导出
        String filePath = "D:/test.csv";
        List<String[]> dataList = new ArrayList<String[]>();
        for (int i = 0; i < 10; i++) {
            dataList.add(new String[] { "0" + i, "小明" + i, "java" + i });
        }
        exportCsv(dataList, filePath);  

        // 测试导入
        List<String[]> datas = importCsv(filePath);
        for (String[] strings : datas) {
            System.out.println(strings[0]);
        }
    }  

    /**
     * java导入csv文件
     *
     * @param filePath
     *            导入路径
     * @return
     * @throws Exception
     */
    public static List<String[]> importCsv(String filePath) throws Exception {
        CsvReader reader = null;
        List<String[]> dataList = new ArrayList<String[]>();
        try {
            reader = new CsvReader(filePath, separator, Charset.forName("GBK"));  

            // 读取表头  加上这一句是不算表头数据从第二行开始取
            reader.readHeaders();
            // 逐条读取记录，直至读完
            while (reader.readRecord()) {
                dataList.add(reader.getRawRecord().split(","));
                // // 下面是几个常用的方法
                // 读取一条记录
                System.out.println(reader.getRawRecord());
                // 按列名读取这条记录的值
                System.out.println(reader.get(0));
                System.out.println(reader.get(1));
                System.out.println(reader.get(2));
                System.out.println(reader.get(3));
            }
        } catch (Exception e) {
            System.out.println("读取CSV出错..." + e);
            throw e;
        } finally {
            if (null != reader) {
                reader.close();
            }
        }  

        return dataList;
    }  

    /**
     * java导出cvs文件
     *
     * @param dataList
     *            数据集
     * @param filePath
     *            导出路径
     * @return
     * @throws Exception
     */
    public static boolean exportCsv(List<String[]> dataList, String filePath) throws Exception {
        boolean isSuccess = false;
        CsvWriter writer = null;
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(filePath, true);
            writer = new CsvWriter(out, separator, Charset.forName("GBK"));
            for (String[] strs : dataList) {
                writer.writeRecord(strs);
            }  

            isSuccess = true;
        } catch (Exception e) {
            System.out.println("生成CSV出错..." + e);
            throw e;
        } finally {
            if (null != writer) {
                writer.close();
            }
            if (null != out) {
                try {
                    out.close();
                } catch (IOException e) {
                    System.out.println("exportCsv close Exception: " + e);
                    throw e;
                }
            }
        }  

        return isSuccess;
    }  

}

　　二、利用流操作csv文件

package com.iflytek.demo;  

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;  

public class CSVUtil2 {  

    public static void main(String[] args) {
        // 测试 导出
        // List<String> dataList = new ArrayList<String>();
        // dataList.add("1,张三,男");
        // dataList.add("2,李四,男");
        // dataList.add("3,小红,女");
        // boolean isSuccess = exportCsv(new File("D:/test.csv"), dataList);
        // System.out.println(isSuccess);  

        // 测试 导入
        List<String> dataList = importCsv(new File("D:/test.csv"));
        if (dataList != null && !dataList.isEmpty()) {
            for (String data : dataList) {
                System.out.println(data);
            }
        }
    }  

    /**
     * 导出
     *
     * @param file
     *            csv文件(路径+文件名)，csv文件不存在会自动创建
     * @param dataList
     *            数据
     * @return
     */
    public static boolean exportCsv(File file, List<String> dataList) {
        boolean isSucess = false;  

        FileOutputStream out = null;
        OutputStreamWriter osw = null;
        BufferedWriter bw = null;
        try {
            out = new FileOutputStream(file);
            osw = new OutputStreamWriter(out);
            bw = new BufferedWriter(osw);
            if (dataList != null && !dataList.isEmpty()) {
                for (String data : dataList) {
                    bw.append(data).append("\r\n");
                }
            }
            isSucess = true;
        } catch (Exception e) {
            isSucess = false;
        } finally {
            if (bw != null) {
                try {
                    bw.close();
                    bw = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (osw != null) {
                try {
                    osw.close();
                    osw = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                    out = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }  

        return isSucess;
    }  

    /**
     * 导入
     *
     * @param file
     *            csv文件(路径+文件)
     * @return
     */
    public static List<String> importCsv(File file) {
        List<String> dataList = new ArrayList<String>();  

        BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader(file));
            String line = "";
            while ((line = br.readLine()) != null) {
                dataList.add(line);
            }
        } catch (Exception e) {
        } finally {
            if (br != null) {
                try {
                    br.close();
                    br = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }  

        return dataList;
    }  

}

　　

源码：http://pan.baidu.com/s/1nt1r7ap

参考：http://write.blog.csdn.net/postedit/49755535