[update] FileUtil增加读取大文件自定义方法和单纯读取方法

2025-06-24 05:52:43 +08:00 · 2024-04-15 18:16:00 +08:00 · 2024-04-15 18:16:00 +08:00 · 9731faf9f8
commit 9731faf9f8
parent e7b8f020ed
5 changed files with 163 additions and 37 deletions
--- a/UPDATE.md
+++ b/UPDATE.md
@ -1,5 +1,13 @@
 yexuejc-base 更新记录
 ------------------
+#### version ：1.5.3-jre8
+**time： ** <br/>
+**branch：** jre8    <br/>
+**update：**     <br/>
+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
+2.
+---
+
 #### version ：1.5.2-jre8
 **time：2024-4-7 14:34:33** <br/>
 **branch：** jre8    <br/>
--- a/src/main/java/com/yexuejc/base/converter/IntegerNullValueDeserializer.java
+++ b/src/main/java/com/yexuejc/base/converter/IntegerNullValueDeserializer.java
@ -0,0 +1,38 @@
+package com.yexuejc.base.converter;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
+
+/**
+ * 反序列化中内容为空时，返回Integer为空
+ * <p>使用方式：@JsonDeserialize(using = IntegerNullValueDeserializer.class)</p>
+ * @author: yexuejc
+ * @date: 2024/4/15 18:08
+ */
+public class IntegerNullValueDeserializer extends StdScalarDeserializer<Integer> {
+    public IntegerNullValueDeserializer() {
+        super(Integer.class);
+    }
+
+    @Override
+    public Integer deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+        String value = p.getValueAsString();
+        if (isInteger(value)) {
+            return super._parseInteger(p, ctxt, Integer.class);
+        } else {
+            return null;
+        }
+    }
+
+    private static boolean isInteger(String s) {
+        try {
+            Integer.parseInt(s);
+            return true;
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
+}
--- a/src/main/java/com/yexuejc/base/util/FileUtil.java
+++ b/src/main/java/com/yexuejc/base/util/FileUtil.java
@ -18,6 +18,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Base64;
 import java.util.List;
+import java.util.function.Function;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.zip.CRC32;
@ -38,11 +39,14 @@ import io.jsonwebtoken.lang.Assert;
 * @time 2017年11月3日 下午3:12:49
 */
 public class FileUtil {
-    static Logger logger = Logger.getLogger(FileUtil.class.getName());
+    private static final Logger logger = Logger.getLogger(FileUtil.class.getName());

    private FileUtil() {
    }

+
+    private static final String NEW_LINE = "\n";
+    private static final String CONSTANT_DOT = ".";
    private static final String TYPE_TAR_GZ = ".tar.gz";
    private static final String TYPE_CSV = ".csv";
    private static final String TAR_GZ = "tar.gz";
@ -61,7 +65,7 @@ public class FileUtil {
            if (fileName.lastIndexOf(TYPE_TAR_GZ) > 0) {
                return TAR_GZ;
            }
-            return fileName.substring(fileName.lastIndexOf(".") + 1);
+            return fileName.substring(fileName.lastIndexOf(CONSTANT_DOT) + 1);
        } catch (Exception e) {
            logger.severe("file doesn't exist or is not a file");
        }
@ -332,22 +336,19 @@ public class FileUtil {
    }

    /**
-     * 分段读取大文件
+     * 分段读取大文件（不限格式）
     *
-     * @param csvFilePath         文件路径
+     * @param filePath         文件路径
     * @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
     * @param <T>          读取结果类型bean
-     * @return
+     * @return 文件分页读取内容（自定义处理后）及读取信息
     */
-    public static <T> ReadFileBean<T> readBigFile(String csvFilePath, ReadFileBean<T> readFileBean, Class<T> readCls) throws IOException {
-        if (!isFileExist(csvFilePath)) {
-            throw new FileNotFoundException(String.format("解析用的csv： [%s] 文件不存在。", csvFilePath));
-        }
-        if (!csvFilePath.endsWith(TYPE_CSV)) {
-            throw new IOException(String.format("解析用的csv： [%s] 文件不是CSV文件格式。", csvFilePath));
+    public static <T> ReadFileBean<T> readBigFile(String filePath, ReadFileBean<T> readFileBean, Function<List<String>, List<T>> readAfter) throws IOException {
+        if (!isFileExist(filePath)) {
+            throw new FileNotFoundException(String.format("[%s]文件不存在。", filePath));
        }
        List<String> datas = new ArrayList<>();
-        try (RandomAccessFile randomAccessFile = new RandomAccessFile(new File(csvFilePath), "r")) {
+        try (RandomAccessFile randomAccessFile = new RandomAccessFile(new File(filePath), "r")) {
            if (readFileBean.getPointer() < 0) {
                readFileBean.setPointer(0);
            }
@ -365,29 +366,59 @@ public class FileUtil {
            //无数据
            return readFileBean.setDatas(new ArrayList<>());
        }
-
-        //csv文件处理
-        com.yexuejc.base.pojo.CsvToBean csvToBean = getCsvToBean(readCls);
-        readFileBean.setHeader(csvToBean.getHeader());
-        if (csvToBean.hasHeader()) {
-            //文件存在header,设置header优先,没设置使用文件的
-            if (StrUtil.isNotEmpty(csvToBean.getHeader())) {
-                //替换header
-                datas.remove(0);
-                datas.add(0, csvToBean.getHeader());
-            } else {
-                readFileBean.setHeader(datas.get(0));
-            }
-        } else {
-            //文件不存在header，使用设置的
-            datas.add(0, csvToBean.getHeader());
-        }
-
-        List<T> dataList = readCsv(String.join("\n", datas), readCls, csvToBean.getDelimiter());
+        List<T> dataList = readAfter.apply(datas);
        readFileBean.setDatas(dataList);
        return readFileBean;
    }

+    /**
+     * 分段读取大文件(不解析)
+     *
+     * @param csvFilePath         文件路径
+     * @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
+     * @return 文件分页读取内容（每行为一个String对象）及读取信息
+     */
+    public static ReadFileBean<String> readBigFile(String csvFilePath, ReadFileBean<String> readFileBean) throws IOException {
+        return readBigFile(csvFilePath, readFileBean, (datas) -> datas);
+    }
+
+    /**
+     * 分段读取大文件(CSV格式)
+     *
+     * @param csvFilePath         文件路径
+     * @param readFileBean 分段每次读取的bean 初始值需要设置每次读取的行数
+     * @param <T>          读取结果类型bean
+     * @return 文件分页读取内容（转bean后）及读取信息
+     */
+    public static <T> ReadFileBean<T> readBigFile(String csvFilePath, ReadFileBean<T> readFileBean, Class<T> readCls) throws IOException {
+        if (!csvFilePath.endsWith(TYPE_CSV)) {
+            throw new IOException(String.format("[%s]文件不是CSV文件格式。", csvFilePath));
+        }
+        return readBigFile(csvFilePath, readFileBean, (datas) -> {
+            //csv文件处理
+            com.yexuejc.base.pojo.CsvToBean csvToBean = getCsvToBean(readCls);
+            readFileBean.setHeader(csvToBean.getHeader());
+            if (csvToBean.hasHeader()) {
+                //文件存在header,设置header优先,没设置使用文件的
+                if (StrUtil.isNotEmpty(csvToBean.getHeader())) {
+                    //替换header
+                    datas.remove(0);
+                    datas.add(0, csvToBean.getHeader());
+                } else {
+                    readFileBean.setHeader(datas.get(0));
+                }
+            } else {
+                //文件不存在header，使用设置的
+                datas.add(0, csvToBean.getHeader());
+            }
+            try {
+                return readCsv(String.join(NEW_LINE, datas), readCls, csvToBean.getDelimiter());
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        });
+    }
+
    /**
     * 获取csv的header,使用注解{@link CsvToBean}
     *
--- a/src/test/java/com/yexuejc/base/util/FileUtilTest.java
+++ b/src/test/java/com/yexuejc/base/util/FileUtilTest.java
@ -4,6 +4,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Paths;
 import java.util.List;
+import java.util.stream.Collectors;

 import com.yexuejc.base.pojo.ReadFileBean;
 import com.yexuejc.base.util.bean.AppnodeCertCsvBean;
@ -54,19 +55,63 @@ public class FileUtilTest {
    }

    private static void readCsvFile() throws IOException {
-        String path = "F:\\coding\\yexuejc-base2\\src\\test\\java\\com\\yexuejc\\base\\util\\test.csv";
+        String path = "F:\\coding\\yexuejc-base\\src\\test\\java\\com\\yexuejc\\base\\util\\test.csv";

-        List<AppnodeCertCsvBean> list = FileUtil.readCsv(path, AppnodeCertCsvBean.class, true, "enable,domain,protocol,deployHost,deployPath,uname,pwd,appnodeId", ',');
-        System.out.println("***********************************************");
-        System.out.println(JsonUtil.formatPrinter(list));
-        System.out.println("条数：" + list.size());
+//        List<AppnodeCertCsvBean> list = FileUtil.readCsv(path, AppnodeCertCsvBean.class, true, "enable,domain,protocol,deployHost,deployPath,uname,pwd,appnodeId", ',');
+//        System.out.println("***********************************************");
+//        System.out.println(JsonUtil.formatPrinter(list));
+//        System.out.println("条数：" + list.size());

+        //直接把每行读取成字符串
+        ReadFileBean<String> readFileBean2 = new ReadFileBean<>(2);
+        ReadFileBean<String> bean2 = FileUtil.readBigFile(path, readFileBean2);
+        System.out.println("直接把每行读取成字符串============================================");
+        System.out.println(JsonUtil.formatPrinter(bean2));
+        System.out.println("直接把每行读取成字符串============================================");
+
+        //自定义每行数据的处理
+        ReadFileBean<AppnodeCertCsvBean> readFileBean1 = new ReadFileBean<>(2);
+        ReadFileBean<AppnodeCertCsvBean> bean1 = FileUtil.readBigFile(path, readFileBean1, datas -> {
+            if (readFileBean1.getStartRowNum() == 1) {
+                datas.remove(0);//跳过第一行
+            }
+            return datas.stream().map(str -> {
+                //自定义处理每一条数据
+                String[] split = str.split(",");
+                AppnodeCertCsvBean app = new AppnodeCertCsvBean();
+                app.setEnable(getValue(split, 0));
+                app.setDomain(getValue(split, 1));
+                app.setProtocol(getValue(split, 2));
+                app.setDeployHost(getValue(split, 3));
+                app.setDeployPath(getValue(split, 4));
+                app.setUname(getValue(split, 5));
+                app.setPwd(getValue(split, 6));
+                if (StrUtil.isNotEmpty(getValue(split, 7))) {
+                    app.setAppnodeId(Integer.valueOf(getValue(split, 7)));
+                }
+                return app;
+            }).collect(Collectors.toList());
+        });
+        System.out.println("自定义每行数据的处理============================================");
+        System.out.println(JsonUtil.formatPrinter(bean1));
+        System.out.println("自定义每行数据的处理============================================");
+
+        //直接使用提供的csv文件读取
        ReadFileBean<AppnodeCertCsvBean> readFileBean = new ReadFileBean<>(2);
        do {
            ReadFileBean<AppnodeCertCsvBean> bean = FileUtil.readBigFile(path, readFileBean, AppnodeCertCsvBean.class);
-            System.out.println("============================================");
+            System.out.println("直接使用提供的csv文件读取============================================");
            System.out.println(JsonUtil.formatPrinter(bean));
+            System.out.println("直接使用提供的csv文件读取============================================");
        } while (readFileBean.hasNext());

    }
+
+    private static String getValue(String[] value, int index) {
+        try {
+            return value[index];
+        } catch (Exception e) {
+            return "";
+        }
+    }
 }
--- a/src/test/java/com/yexuejc/base/util/bean/AppnodeCertCsvBean.java
+++ b/src/test/java/com/yexuejc/base/util/bean/AppnodeCertCsvBean.java
@ -2,13 +2,16 @@ package com.yexuejc.base.util.bean;

 import java.io.Serializable;

+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.yexuejc.base.annotation.CsvToBean;
+import com.yexuejc.base.converter.IntegerNullValueDeserializer;

 /**
 *
 * @author: yexuejc
 * @date: 2024/2/27 10:40
 */
+@CsvToBean(header = "enable,domain,protocol,deployHost,deployPath,uname,pwd,appnodeId")
 public class AppnodeCertCsvBean implements Serializable {
    /**是否生效：Y/N*/
    private String enable;
@ -36,6 +39,7 @@ public class AppnodeCertCsvBean implements Serializable {
    /**
     * appnode协议时：且远程部署时，对应的远程appnode的ApiNodeId
     */
+    @JsonDeserialize(using = IntegerNullValueDeserializer.class)
    private Integer appnodeId;

    public String getEnable() {