使用commons-csv生成.csv文件

package com.huihui.main;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;

public class CsvFileBuilder {

private static final String[] header = { "id", "name"};

private static FileWriter fileWriter = null;
private static CSVPrinter csvPrinter = null;
private static CSVFormat csvFormat = CSVFormat.DEFAULT.withRecordSeparator('\n');  // 每条记录间隔符

public static void write(Map<String, String> info) {
File file = new File("test.csv");
System.out.println(file.getAbsolutePath());
try {
if (!file.exists()) {
fileWriter = new FileWriter("test.csv",true);  // 创建test.csv的字符输出流
csvPrinter = new CSVPrinter(fileWriter, csvFormat);
csvPrinter.printRecords(header);  // 生成.csv表的字段名
System.out.println("执行");
}else {
fileWriter = new FileWriter("test.csv",true);  // 创建test.csv的字符输出流
csvPrinter = new CSVPrinter(fileWriter, csvFormat);
System.out.println("文件存在");
}

Set<String> ids = info.keySet();
for (String id : ids) {
List<String> idName = new ArrayList();
idName.add(id);
idName.add(info.get(id));
csvPrinter.printRecord(idName);  // 向.csv文件中添加记录数据
}
System.out.println("生成.csv文件");
}catch(IOException e) {
e.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
csvPrinter.flush();
fileWriter.flush();
fileWriter.close();
csvPrinter.close();
}catch (Exception e) {
e.printStackTrace();
}
}

}
}

package com.huihui.main;

import java.util.HashMap;
import java.util.Map;

public class TestCsvFileBuilder {
public static void main(String[] args) {

Map<String, String> idName = new HashMap();
idName.put("1", "Java");
idName.put("2", "C++");
idName.put("3", "Python");
idName.put("4", "Ruby");

CsvFileBuilder.write(idName);
}
}