java处理微信对账单工具类

以下是一个简单的 Java 工具类，可以用于解析微信支付的对账单文件：

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

public class WeChatBillParser {
    
    private static final String FIELD_SEPARATOR = ",";
    
    public static List<WeChatBillItem> parse(String filePath) throws IOException {
        List<WeChatBillItem> items = new ArrayList<>();
        BufferedReader reader = new BufferedReader(new FileReader(filePath));
        String line;
        boolean isHeader = true;
        while ((line = reader.readLine()) != null) {
            if (isHeader) {
                isHeader = false;
                continue;
            }
            String[] fields = line.split(FIELD_SEPARATOR);
            if (fields.length != 24) {
                throw new IllegalArgumentException("Invalid number of fields in line");
            }
            WeChatBillItem item = new WeChatBillItem();
            item.setTransactionTime(fields[0]);
            item.setAppId(fields[1]);
            item.setMchId(fields[2]);
            item.setSubMchId(fields[3]);
            item.setDeviceInfo(fields[4]);
            item.setTransactionId(fields[5]);
            item.setOutTradeNo(fields[6]);
            item.setOpenId(fields[7]);
            item.setTradeType(fields[8]);
            item.setTradeStatus(fields[9]);
            item.setBankType(fields[10]);
            item.setFeeType(fields[11]);
            item.setTotalFee(fields[12]);
            item.setRedPacketFee(fields[13]);
            item.setRefundId(fields[14]);
            item.setOutRefundNo(fields[15]);
            item.setRefundFee(fields[16]);
            item.setRedPacketRefundFee(fields[17]);
            item.setRefundType(fields[18]);
            item.setTransactionName(fields[19]);
            item.setAttach(fields[20]);
            item.setServiceCharge(fields[21]);
            item.setRate(fields[22]);
            item.setCreateTime(fields[23]);
            items.add(item);
        }
        reader.close();
        return items;
    }
}

其中，`WeChatBillItem` 是一个简单的 POJO 类，用于存储对账单的每一行数据：

public class WeChatBillItem {

    private String transactionTime;
    private String appId;
    private String mchId;
    private String subMchId;
    private String deviceInfo;
    private String transactionId;
    private String outTradeNo;
    private String openId;
    private String tradeType;
    private String tradeStatus;
    private String bankType;
    private String feeType;
    private String totalFee;
    private String redPacketFee;
    private String refundId;
    private String outRefundNo;
    private String refundFee;
    private String redPacketRefundFee;
    private String refundType;
    private String transactionName;
    private String attach;
    private String serviceCharge;
    private String rate;
    private String createTime;

    // getters and setters
}

使用方法：

String filePath = "path/to/wechat/bill.csv";
List<WeChatBillItem> items = WeChatBillParser.parse(filePath);
for (WeChatBillItem item : items) {
    // do something with each item
}