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;
}
}