Java Read CSV File In Java With OpenCSV library 以及中文件乱码解决, Mapping CSV with Java beans - JAVA

sample.csv文件:

COUNTRY,CAPITAL,POPULATION
India,New Delhi, 1.21B
People's republic of China,Beijing, 1.34B
United States,Washington D.C., 0.31B

一.使用readNext()方法一行一行读CSV文件,返回字符串数组

package com.jiangge.csv.opencsvtest;

import java.io.FileReader;
import java.io.IOException;

import au.com.bytecode.opencsv.CSVReader;

//COUNTRY,CAPITAL,POPULATION
//India,New Delhi, 1.21B
//People's republic of China,Beijing, 1.34B
//United States,Washington D.C., 0.31B

/**
 * use readNext() method of CSVReader class to read CSV file line by line. 
 * It returns a String array for each value in row.
 */
public class ReadLineByLine {
	public static void main(String[] args) throws IOException {
		String csvFilename = "C:\\sample.csv";
		CSVReader csvReader = new CSVReader(new FileReader(csvFilename));
		String[] row = null;
		while((row = csvReader.readNext()) != null) {
		    System.out.println(row[0] + " # " + row[1] + " #  " + row[2]);
		}
		//...
		csvReader.close();
	}
}

输出结果:

COUNTRY # CAPITAL #  POPULATION
India # New Delhi #   1.21B
People's republic of China # Beijing #   1.34B
United States # Washington D.C. #   0.31B

二使用 readAll()方法一次读取整个CSV文件,返回 List

package com.jiangge.csv.opencsvtest;

import java.io.FileReader;
import java.io.IOException;
import java.util.List;

import au.com.bytecode.opencsv.CSVReader;

//COUNTRY,CAPITAL,POPULATION
//India,New Delhi, 1.21B
//People's republic of China,Beijing, 1.34B
//United States,Washington D.C., 0.31B


/**
 * read full CSV file once. The readAll() method of CSVReader class comes handy for this.
 * The readAll() method returns a List of String[] for given CSV file.
 * @author jiangge
 */
public class ReadAllTest {
	public static void main(String[] args) throws IOException {
		String[] row = null;
		String csvFilename = "C:\\sample.csv";
		 
		CSVReader csvReader = new CSVReader(new FileReader(csvFilename));
		List content = csvReader.readAll();
		 
		for (Object object : content) {
		    row = (String[]) object;
		    System.out.println(row[0] + " # " + row[1]+ " #  " + row[2]);
		}
		//...
		csvReader.close();
	}
}

输出结果:

COUNTRY # CAPITAL #  POPULATION
India # New Delhi #   1.21B
People's republic of China # Beijing #   1.34B
United States # Washington D.C. #   0.31B

三. 使用其他的分隔符号, 和跳过某些行--具体解释看这里:点击打开链接

CSVReader reader = new CSVReader(new FileReader(file), ';')
CSVReader reader = new CSVReader(new FileReader(file), '#')

跳过前5行,从第6行开始:

CSVReader reader = new CSVReader(new FileReader(file), ',', '\'', 5);

四.Mapping CSV with Java beans

1.java bean

package com.jiangge.csv.opencsvtest;

public class Country {
	private String countryName;
	private String capital;
	private String population;
	
	public String getPopulation() {
		return population;
	}
	public void setPopulation(String population) {
		this.population = population;
	}
	public String getCountryName() {
		return countryName;
	}
	public void setCountryName(String countryName) {
		this.countryName = countryName;
	}
	public String getCapital() {
		return capital;
	}
	public void setCapital(String capital) {
		this.capital = capital;
	}

}

2.关联JavaBean,Now we can map this bean with Opencsv and read the CSV file

package com.jiangge.csv.opencsvtest;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundExceptio

Java Read CSV File In Java With OpenCSV library 以及中文件乱码解决, Mapping CSV with Java beans(一)