Java根据某一字段合并两个 Excel文件

两个Excel表根据时间字段合并在一起：


代码如下：

package com.tyut.rcr;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class test {

        public static void main(String[] args) throws Exception {
            String inputPath1="C:\\Users\\REN\\Desktop\\2016.08.MD.csv";
            String inputPath2="C:\\Users\\REN\\Desktop\\2016.08.AQI.csv";
            String outputPath="C:\\Users\\REN\\Desktop\\2016.08.AQIMD.csv";

            List<String> a1 = readCsv1(inputPath1);
            List<String> a2 = readCsv1(inputPath2);
            List<String> a3 = new ArrayList<String>();

            FileWriter fileWriter = new FileWriter(outputPath,true);


            Iterator<String> iterable =a2.iterator();
            while(iterable.hasNext()){
                String str = iterable.next();
                Iterator<String> iterable1 =a1.iterator();
                while(iterable1.hasNext()){
                    String st2 = iterable1.next();
                    if(str.split(",")[7].equals(st2.split(",")[0])){
                        a3.add(str+","+st2+"\n");
                    }
                }
            }
            Iterator<String> iterable2 =a3.iterator();
            while(iterable2.hasNext()){
                String a = iterable2.next();
                fileWriter.write(a);
            }
            fileWriter.close();
        }

        public static List<String> readCsv1(String path) throws Exception{
            File file2= new File(path);
            InputStreamReader iread2 = new InputStreamReader(new FileInputStream(path));
            List<String> list = new ArrayList<>();
            BufferedReader bufferedReader2 = new BufferedReader(iread2);
            String line2=null;
            while((line2=bufferedReader2.readLine())!=null){
                list.add(line2);
            }
            iread2.close();
            bufferedReader2.close();
            return list;
            }

}