使用POI，实现excel文件导出，图片url导出文件，图片和excel文件导出压缩包

package com.example.excel.util.excel; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import org.apache.poi.hssf.usermodel.HSSFDataValidation; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.poifs.filesystem.POIFSFileSystem; import org.apache.poi.ss.usermodel.*; import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.ss.util.CellRangeAddressList; import org.apache.poi.xssf.streaming.SXSSFWorkbook; import org.apache.poi.xssf.usermodel.XSSFClientAnchor; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.springframework.web.multipart.MultipartFile; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.lang.reflect.Field; import java.math.BigDecimal; import java.math.RoundingMode; import java.net.URL; import java.text.NumberFormat; import java.text.SimpleDateFormat; import java.util.*; import java.util.Map.Entry; import java.util.regex.Pattern; /** * Excel导入导出工具类 * 原文链接（不定时增加新功能）: https://zyqok.blog.csdn.net/article/details/121994504 */ @SuppressWarnings("unused") public class ExcelUtils { private static final String XLSX = ".xlsx"; private static final String XLS = ".xls"; public static final String ROW_MERGE = "row_merge"; public static final String COLUMN_MERGE = "column_merge"; private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss"; private static final String ROW_NUM = "rowNum"; private static final String ROW_DATA = "rowData"; private static final String ROW_TIPS = "rowTips"; private static final int CELL_OTHER = 0; private static final int CELL_ROW_MERGE = 1; private static final int CELL_COLUMN_MERGE = 2; private static final int IMG_HEIGHT = 30; private static final int IMG_WIDTH = 30; private static final char LEAN_LINE = '/'; private static final int BYTES_DEFAULT_LENGTH = 10240; private static final NumberFormat NUMBER_FORMAT = NumberFormat.getNumberInstance(); public static <T> List<T> readFile(File file, Class<T> clazz) throws Exception { JSONArray array = readFile(file); return getBeanList(array, clazz); } public static <T> List<T> readMultipartFile(MultipartFile mFile, Class<T> clazz) throws Exception { JSONArray array = readMultipartFile(mFile); return getBeanList(array, clazz); } public static JSONArray readFile(File file) throws Exception { return readExcel(null, file); } public static JSONArray readMultipartFile(MultipartFile mFile) throws Exception { return readExcel(mFile, null); } public static Map<String, JSONArray> readFileManySheet(File file) throws Exception { return readExcelManySheet(null, file); } public static Map<String, JSONArray> readFileManySheet(MultipartFile file) throws Exception { return readExcelManySheet(file, null); } private static <T> List<T> getBeanList(JSONArray array, Class<T> clazz) throws Exception { List<T> list = new ArrayList<>(); Map<Integer, String> uniqueMap = new HashMap<>(16); for (int i = 0; i < array.size(); i++) { list.add(getBean(clazz, array.getJSONObject(i), uniqueMap)); } return list; } /** * 获取每个对象的数据 */ private static <T> T getBean(Class<T> c, JSONObject obj, Map<Integer, String> uniqueMap) throws Exception { T t = c.newInstance(); Field[] fields = c.getDeclaredFields(); List<String> errMsgList = new ArrayList<>(); boolean hasRowTipsField = false; StringBuilder uniqueBuilder = new StringBuilder(); int rowNum = 0; for (Field field : fields) { // 行号 if (field.getName().equals(ROW_NUM)) { rowNum = obj.getInteger(ROW_NUM); field.setAccessible(true); field.set(t, rowNum); continue; } // 是否需要设置异常信息 if (field.getName().equals(ROW_TIPS)) { hasRowTipsField = true; continue; } // 原始数据 if (field.getName().equals(ROW_DATA)) { field.setAccessible(true); field.set(t, obj.toString()); continue; } // 设置对应属性值 setFieldValue(t, field, obj, uniqueBuilder, errMsgList); } // 数据唯一性校验 if (uniqueBuilder.length() > 0) { if (uniqueMap.containsValue(uniqueBuilder.toString())) { Set<Integer> rowNumKeys = uniqueMap.keySet(); for (Integer num : rowNumKeys) { if (uniqueMap.get(num).equals(uniqueBuilder.toString())) { errMsgList.add(String.format("数据唯一性校验失败,(%s)与第%s行重复)", uniqueBuilder, num)); } } } else { uniqueMap.put(rowNum, uniqueBuilder.toString()); } } // 失败处理 if (errMsgList.isEmpty() && !hasRowTipsField) { return t; } StringBuilder sb = new StringBuilder(); int size = errMsgList.size(); for (int i = 0; i < size; i++) { if (i == size - 1) { sb.append(errMsgList.get(i)); } else { sb.append(errMsgList.get(i)).append(";"); } } // 设置错误信息 for (Field field : fields) { if (field.getName().equals(ROW_TIPS)) { field.setAccessible(true); field.set(t, sb.toString()); } } return t; } private static <T> void setFieldValue(T t, Field field, JSONObject obj, StringBuilder uniqueBuilder, List<String> errMsgList) { // 获取 ExcelImport 注解属性 ExcelImport annotation = field.getAnnotation(ExcelImport.class); if (annotation == null) { return; } String cname = annotation.value(); if (cname.trim().length() == 0) { return; } // 获取具体值 String val = null; if (obj.containsKey(cname)) { val = getString(obj.getString(cname)); } if (val == null) { return; } field.setAccessible(true); // 判断是否必填 boolean require = annotation.required(); if (require && val.isEmpty()) { errMsgList.add(String.format("[%s]不能为空", cname)); return; } // 数据唯一性获取 boolean unique = annotation.unique(); if (unique) { if (uniqueBuilder.length() > 0) { uniqueBuilder.append("--").append(val); } else { uniqueBuilder.append(val); } } // 判断是否超过最大长度 int maxLength = annotation.maxLength(); if (maxLength > 0 && val.length() > maxLength) { errMsgList.add(String.format("[%s]长度不能超过%s个字符(当前%s个字符)", cname, maxLength, val.length())); } // 判断当前属性是否有映射关系 LinkedHashMap<String, String> kvMap = getKvMap(annotation.kv()); if (!kvMap.isEmpty()) { boolean isMatch = false; for (String key : kvMap.keySet()) { if (kvMap.get(key).equals(val)) { val = key; isMatch = true; break; } }