java 操做 csv文件

CSV是逗號分隔文件(Comma Separated Values)的首字母英文縮寫，是一種用來存儲數據的純文本格式，一般用於電子表格或數據庫軟件。在 CSV文件中，數據「欄」以逗號分隔，可容許程序經過讀取文件爲數據從新建立正確的欄結構，並在每次遇到逗號時開始新的一欄。

1、利用javacsv2.0操做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作導入導出csv文件工具類<br/> 
 *  
 *  
 * @author kpchen 
 *  
 */  
public class CSVUtil {  
  
    static char separator = ',';  
  
    public static void main(String[] args) throws Exception {  
  
        // 測試導出  
        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);  
  
  
        // 測試導入  
        List<String[]> datas = importCsv(filePath);  
        for (String[] strings : datas) {  
            System.out.println(strings[0]);  
        }  
    }  
  
    /** 
     * java導入csv文件 
     *  
     * @param filePath 
     *            導入路徑 
     * @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"));  
  
            // 讀取表頭  加上這一句是不算表頭數據從第二行開始取
            reader.readHeaders();  
            // 逐條讀取記錄，直至讀完  
            while (reader.readRecord()) {  
                dataList.add(reader.getRawRecord().split(","));  
                // // 下面是幾個經常使用的方法  
                // 讀取一條記錄  
                System.out.println(reader.getRawRecord());  
                // 按列名讀取這條記錄的值  
                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("讀取CSV出錯..." + e);  
            throw e;  
        } finally {  
            if (null != reader) {  
                reader.close();  
            }  
        }  
  
        return dataList;  
    }  
  
    /** 
     * java導出cvs文件 
     *  
     * @param dataList 
     *            數據集 
     * @param filePath 
     *            導出路徑 
     * @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出錯..." + 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;  
    }  
  
}  

　　2、利用流操做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) {  
        // 測試 導出  
        // List<String> dataList = new ArrayList<String>();  
        // dataList.add("1,張三,男");  
        // dataList.add("2,李四,男");  
        // dataList.add("3,小紅,女");  
        // boolean isSuccess = exportCsv(new File("D:/test.csv"), dataList);  
        // System.out.println(isSuccess);  
  
        // 測試 導入  
        List<String> dataList = importCsv(new File("D:/test.csv"));  
        if (dataList != null && !dataList.isEmpty()) {  
            for (String data : dataList) {  
                System.out.println(data);  
            }  
        }  
    }  
  
    /** 
     * 導出 
     *  
     * @param file 
     *            csv文件(路徑+文件名)，csv文件不存在會自動建立 
     * @param dataList 
     *            數據 
     * @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;  
    }  
  
    /** 
     * 導入 
     *  
     * @param file 
     *            csv文件(路徑+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;  
    }  
  
}  

　　

源碼：http://pan.baidu.com/s/1nt1r7ap

 

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