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[update] FileUtil增加读取大文件自定义方法和单纯读取方法
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@ -1,6 +1,14 @@
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yexuejc-base 更新记录
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------------------
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#### version ：1.5.3-jre11
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**time： ** <br/>
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**branch：** jre11 <br/>
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**update：** <br/>
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1. [FileUtil.java](src/main/java/com/yexuejc/base/util/FileUtil.java)增加读取大文件自定义方法和单纯读取方法
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2.
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---
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#### version ：1.5.2-jre11
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**time：2024-4-7 14:34:33** <br/>
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**branch：** jre11 <br/>
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@ -18,6 +18,7 @@ import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Base64;
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import java.util.List;
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import java.util.function.Function;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import java.util.zip.CRC32;
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@ -38,11 +39,14 @@ import io.jsonwebtoken.lang.Assert;
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* @time 2017年11月3日 下午3:12:49
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*/
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public class FileUtil {
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static Logger logger = Logger.getLogger(FileUtil.class.getName());
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private static final Logger logger = Logger.getLogger(FileUtil.class.getName());
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private FileUtil() {
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}
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private static final String NEW_LINE = "\n";
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private static final String CONSTANT_DOT = ".";
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private static final String TYPE_TAR_GZ = ".tar.gz";
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private static final String TYPE_CSV = ".csv";
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private static final String TAR_GZ = "tar.gz";
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@ -61,7 +65,7 @@ public class FileUtil {
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if (fileName.lastIndexOf(TYPE_TAR_GZ) > 0) {
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return TAR_GZ;
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}
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return fileName.substring(fileName.lastIndexOf(".") + 1);
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return fileName.substring(fileName.lastIndexOf(CONSTANT_DOT) + 1);
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} catch (Exception e) {
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logger.severe("file doesn't exist or is not a file");
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}
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@ -332,22 +336,19 @@ public class FileUtil {
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}
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/**
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* 分段读取大文件
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* 分段读取大文件（不限格式）
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*
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* @param csvFilePath 文件路径
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* @param filePath 文件路径
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* @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
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* @param <T> 读取结果类型bean
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* @return
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* @return 文件分页读取内容（自定义处理后）及读取信息
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*/
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public static <T> ReadFileBean<T> readBigFile(String csvFilePath, ReadFileBean<T> readFileBean, Class<T> readCls) throws IOException {
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if (!isFileExist(csvFilePath)) {
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throw new FileNotFoundException(String.format("解析用的csv： [%s] 文件不存在。", csvFilePath));
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}
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if (!csvFilePath.endsWith(TYPE_CSV)) {
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throw new IOException(String.format("解析用的csv： [%s] 文件不是CSV文件格式。", csvFilePath));
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public static <T> ReadFileBean<T> readBigFile(String filePath, ReadFileBean<T> readFileBean, Function<List<String>, List<T>> readAfter) throws IOException {
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if (!isFileExist(filePath)) {
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throw new FileNotFoundException(String.format("[%s]文件不存在。", filePath));
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}
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List<String> datas = new ArrayList<>();
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try (RandomAccessFile randomAccessFile = new RandomAccessFile(new File(csvFilePath), "r")) {
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try (RandomAccessFile randomAccessFile = new RandomAccessFile(new File(filePath), "r")) {
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if (readFileBean.getPointer() < 0) {
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readFileBean.setPointer(0);
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}
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@ -365,29 +366,60 @@ public class FileUtil {
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//无数据
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return readFileBean.setDatas(new ArrayList<>());
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}
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//csv文件处理
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com.yexuejc.base.pojo.CsvToBean csvToBean = getCsvToBean(readCls);
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readFileBean.setHeader(csvToBean.getHeader());
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if (csvToBean.hasHeader()) {
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//文件存在header,设置header优先,没设置使用文件的
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if (StrUtil.isNotEmpty(csvToBean.getHeader())) {
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//替换header
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datas.remove(0);
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datas.add(0, csvToBean.getHeader());
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} else {
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readFileBean.setHeader(datas.get(0));
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}
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} else {
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//文件不存在header，使用设置的
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datas.add(0, csvToBean.getHeader());
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}
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List<T> dataList = readCsv(String.join("\n", datas), readCls, csvToBean.getDelimiter());
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List<T> dataList = readAfter.apply(datas);
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readFileBean.setDatas(dataList);
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return readFileBean;
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}
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/**
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* 分段读取大文件(不解析)
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*
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* @param csvFilePath 文件路径
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* @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
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* @return 文件分页读取内容（每行为一个String对象）及读取信息
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*/
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public static ReadFileBean<String> readBigFile(String csvFilePath, ReadFileBean<String> readFileBean) throws IOException {
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return readBigFile(csvFilePath, readFileBean, (datas) -> datas);
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}
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/**
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* 分段读取大文件(CSV格式)
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*
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* @param csvFilePath 文件路径
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* @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
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* @param <T> 读取结果类型bean
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* @return 文件分页读取内容（转bean后）及读取信息
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*/
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public static <T> ReadFileBean<T> readBigFile(String csvFilePath, ReadFileBean<T> readFileBean, Class<T> readCls) throws IOException {
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if (!csvFilePath.endsWith(TYPE_CSV)) {
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throw new IOException(String.format("[%s]文件不是CSV文件格式。", csvFilePath));
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}
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return readBigFile(csvFilePath, readFileBean, (datas) -> {
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//csv文件处理
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com.yexuejc.base.pojo.CsvToBean csvToBean = getCsvToBean(readCls);
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readFileBean.setHeader(csvToBean.getHeader());
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if (csvToBean.hasHeader()) {
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//文件存在header,设置header优先,没设置使用文件的
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if (StrUtil.isNotEmpty(csvToBean.getHeader())) {
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//替换header
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datas.remove(0);
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datas.add(0, csvToBean.getHeader());
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} else {
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readFileBean.setHeader(datas.get(0));
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}
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} else {
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//文件不存在header，使用设置的
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datas.add(0, csvToBean.getHeader());
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}
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try {
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return readCsv(String.join(NEW_LINE, datas), readCls, csvToBean.getDelimiter());
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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});
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}
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/**
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* 获取csv的header,使用注解{@link CsvToBean}
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*
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