2. 读取CSV文件 下面的代码展示了如何读取CSV文件: importorg.apache.commons.csv.CSVFormat;importorg.apache.commons.csv.CSVRecord;importjava.io.FileReader;importjava.io.Reader;publicvoidreadCsvFile(StringfilePath){try{Readerin=newFileReader(filePath);Iterable<CSVRecord>records=CSVFormat.DEFAULT.withFirstRe...
最先进入脑海的是使用Pandas包来处理,但客户要求用内置的CSV模块来做。 如果使用文件对象的read方法,指定一个固定的BlockSize,每次读入一块固定大小的内容进行处理,这样看起来可行,但这个ChunkSize不知道该指定多少,每行记录的栏位数都相同,但具体每行记录,可能有大有小,指定ChunkSize,如果读进来的内容是10.5行或20.3行...
publicclassOperateCSVfile{ publicstaticvoidmain(String[]args){ String[]str={"省","市","区","街","路","里","幢","村","室","园","苑","巷","号"}; FileinFile=newFile("C://in.csv");// 读取的CSV文件 File outFile = new File("C://out.csv");//写出的CSV文件 String inStr...
//ArrayList<String> csvList = new ArrayList<String>(); //CsvReader reader = new CsvReader(csvFilePath,',',Charset.forName("gbk")); //一般用这编码读就可以了 //reader.readHeaders(); // 跳过表头 如果需要表头的话,不要写这句。 //逐条读取记录,直至读完 //System.out.println(reader.readRec...
import java.nio.file.Paths; import java.time.Duration; import java.time.Instant; import java.time.temporal.ChronoUnit; import java.util.ArrayList; import java.util.List; import java.util.UUID; import java.util.concurrent.ThreadLocalRandom; public class CsvSpeed { public List < Person > read (...
OpenCSVis a tool that can be used to read a CSV file in java or write data to a CSV file. 1. Setting Up If we are working on a Maven project, we can include thelatest OpenCSV maven dependencyinpom.xmlfile like below. <dependency><groupId>com.opencsv</groupId><artifactId>opencsv</...
CsvWriter cwriter = new CsvWriter(writer,','); while(creader.readRecord()){ inString = creader.getRawRecord();//读取一行数据 for(int i = 0;i < str.length;i++){ tmpString = inString.replace(str[i], "," + str[i] + ","); inString = tmpString; ...
();//关闭通道 } public static void readCSV() { try { File kkFile = new File("D:/桌面/nlp-tools/DB/MYSQL/guilin_areas.csv"); InputStream in = new FileInputStream(kkFile); CsvReader cr = new CsvReader(in, ',', Charset.forName("GBK")); cr.readHeaders(); String[] headers = ...
读CSV文件 1、使用Iterator方式读 复制代码 代码如下: CSVReader reader = new CSVReader(new FileReader("yourfile.csv")); String [] nextLine; while ((nextLine = reader.readNext()) != null) { // nextLine[] is an array of values from the line ...
下面的问题:我必须读取一个CSV文件，它必须看起来像这样：如果您的CSV文件总是包含指示表列名称的标题行...