使用Apache Common CSV读写CSV文件

怼烎@ 2022-08-10 09:28 341阅读 0赞

jar包下载地址：[http://commons.apache.org/proper/commons-csv/][http_commons.apache.org_proper_commons-csv]，点击Download进行下载！

示例直接看代码吧：

我们首先定义一个Student的Bean：

class Student {
        public Student() {
    
        }
        public Student(String id, String name, String gender, String major) {
            super();
            this.id = id;
            this.name = name;
            this.gender = gender;
            this.major = major;
        }
    
        private String id;
        private String name;
        private String gender;
        private String major;
    
        public String getID() {
            return id;
        }
        public void setID(String id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getGender() {
            return gender;
        }
        public void setGender(String gender) {
            this.gender = gender;
        }
        public String getMajor() {
            return major;
        }
        public void setMajor(String major) {
            this.major = major;
        }
    
        @Override
        public String toString() {
            return id + ',' + name + ',' + gender + ',' + major;
        }
    }

如下是读写CSV的代码：

import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.Reader;
    import java.io.Writer;
    import java.util.ArrayList;
    import java.util.List;
    
    import org.apache.commons.csv.CSVFormat;
    import org.apache.commons.csv.CSVPrinter;
    import org.apache.commons.csv.CSVRecord;
    
    public class CSVDemo {
        public static void main(String[] arg) {
            final String[] FILE_HEADER = {
       "ID","Name","Gender","Major"};
            final String FILE_NAME = "student.csv";
    
            Student stuTZY = new Student("001", "谭振宇", "男", "GIS");
            Student stuZJL = new Student("002", "周杰伦", "男", "音乐");
            List<Student> students = new ArrayList<>();
            students.add(stuTZY);
            students.add(stuZJL);
    
            // 这里显式地配置一下CSV文件的Header，然后设置跳过Header（要不然读的时候会把头也当成一条记录）
            CSVFormat format = CSVFormat.DEFAULT.withHeader(FILE_HEADER).withSkipHeaderRecord();
    
            // 这是写入CSV的代码
            try(Writer out = new FileWriter(FILE_NAME);
                CSVPrinter printer = new CSVPrinter(out, format)) {
                for (Student student : students) {
                    List<String> records = new ArrayList<>();
                    records.add(student.getID());
                    records.add(student.getName());
                    records.add(student.getGender());
                    records.add(student.getMajor());
                    printer.printRecord(records);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            // 这是从上面写入的文件中读出数据的代码
            try(Reader in = new FileReader(FILE_NAME)) {
                Iterable<CSVRecord> records = format.parse(in);
                String strID;
                String strName;
                for (CSVRecord record : records) {
                    strID = record.get("ID");
                    strName = record.get("Name");
                    System.out.println(strID + " " + strName);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

输入结果：

001 谭振宇
    002 周杰伦

[http_commons.apache.org_proper_commons-csv]: http://commons.apache.org/proper/commons-csv/