1.单元格样式设置
1.1实体类
public class DemoData {
@ExcelProperty("PK")
private String name;
@ExcelProperty("年龄")
private int age;
// 必须提供无参构造方法
public DemoData() {}
public DemoData(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
// 省略 getter/setter
}1.2启动类
public class ExcelExporter {
public static void main(String[] args) {
String fileName = "D:\\idea代码\\demo1\\src\\main\\resources\\example3.xlsx";
List<com.example.demo1.com.liyingjie.mapper.ExcelExporter.DemoData> dataList = new ArrayList<>();
dataList.add(new com.example.demo1.com.liyingjie.mapper.ExcelExporter.DemoData("姓名", 20));
dataList.add(new com.example.demo1.com.liyingjie.mapper.ExcelExporter.DemoData("姓名", 30));
EasyExcel.write(fileName, DemoData.class)
.registerWriteHandler(new HeaderBackgroundColorHandler())
.sheet("Sheet1")
.doWrite(dataList);
}
}1.3自定义拦截器
public class HeaderBackgroundColorHandler implements CellWriteHandler {
private Set<String> targetHeaders; // 目标表头集合
private String targetHeader1="PK";
private String targetHeader2="主";
@Override
public void afterCellDispose(CellWriteHandlerContext context) {
boolean isHead = context.getHead() != null && context.getHead();
// 处理表头行
if (isHead) {
String headerValue = context.getFirstCellData().getStringValue();
if (headerValue.trim().contains(targetHeader1) || headerValue.trim().contains(targetHeader2)) {
// 获取或创建样式
WriteCellStyle writeCellStyle = context.getFirstCellData().getOrCreateStyle();
// 设置背景色
writeCellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
writeCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 设置字体样式
WriteFont writeFont = new WriteFont();
writeFont.setBold(true); // 加粗
writeFont.setColor(IndexedColors.BLACK.getIndex()); // 字体颜色
writeCellStyle.setWriteFont(writeFont);
}
}
}
}2 下拉框设置
2.1实体类
public class Employee {
@ExcelProperty("姓名")
private String name;
// 姓名
@ExcelProperty("部门")
private String department; // 部门
@ExcelProperty("职位")
private String position; // 职位
// 无参构造函数
public Employee() {
}
// 全参构造函数
public Employee(String name, String department, String position) {
this.name = name;
this.department = department;
this.position = position;
}
// Getter和Setter方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
// toString方法
@Override
public String toString() {
return "Employee{" +
"name='" + name + '\'' +
", department='" + department + '\'' +
", position='" + position + '\'' +
'}';
}
}public class Department {
@ExcelProperty(value = "部门")
private String departmentName; // 部门名称
@ExcelProperty(value = "职位")
private String position; // 职位
// 无参构造函数
public Department() {
}
// 全参构造函数
public Department(String departmentName, String position) {
this.departmentName = departmentName;
this.position = position;
}
// Getter和Setter方法
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
// toString方法
@Override
public String toString() {
return "Department{" +
"departmentName='" + departmentName + '\'' +
", position='" + position + '\'' +
'}';
}
}2.2自定义拦截器
public class DynamicDropDownHandler implements SheetWriteHandler {
// 字典数据格式: Map<表头名称, Map<Key, Value>>
private final Map<String, Map<Integer, String>> dictDataMap;
// 新增：传入的表头数据
private final List<List<String>> listHead;
public DynamicDropDownHandler(Map<String, Map<Integer, String>> dictDataMap, List<List<String>> listHead) {
this.dictDataMap = dictDataMap;
this.listHead = listHead;
}
@Override
public void afterSheetCreate(SheetWriteHandlerContext context) {
Sheet sheet = context.getWriteSheetHolder().getSheet();
DataValidationHelper helper = sheet.getDataValidationHelper();
// 1. 直接使用传入的表头数据，跳过映射逻辑
Map<String, Integer> headerMap = new HashMap<>();
for (int i = 0; i < listHead.size(); i++) {
List<String> headers = listHead.get(i);
if (!headers.isEmpty()) {
headerMap.put(headers.get(0), i); // 取每个 List<String> 的第一个元素作为表头名称
}
}
// 2. 遍历字典数据，设置下拉框
for (Map.Entry<String, Map<Integer, String>> entry : dictDataMap.entrySet()) {
String headerName = entry.getKey();
Map<?, ?> optionsMap = entry.getValue();
// 如果当前 Sheet 存在该表头，则设置下拉框
if (headerMap.containsKey(headerName)) {
// 提取下拉选项（假设使用 Map 的 Value 作为选项）
List<String> options = new ArrayList<>();
for (Object value : optionsMap.values()) {
options.add(value.toString());
}
// 设置下拉框
setDropDownForColumn(sheet, helper, headerMap.get(headerName), options);
} else {
System.out.println("未找到匹配的表头: " + headerName);
}
}
}
/**
* 为指定列设置下拉框
*/
private void setDropDownForColumn(Sheet sheet,
DataValidationHelper helper,
int columnIndex,
List<String> options) {
if (options.isEmpty()) return;
// 设置应用范围（从第二行开始，默认设置100行）
int lastRow = 100; // 默认设置100行
CellRangeAddressList range = new CellRangeAddressList(1, lastRow, columnIndex, columnIndex);
// 创建数据验证约束
DataValidationConstraint constraint = helper.createExplicitListConstraint(
options.toArray(new String[0])
);
// 创建并应用验证
DataValidation validation = helper.createValidation(constraint, range);
validation.setSuppressDropDownArrow(true);
sheet.addValidationData(validation);
}
}2.3启动类
public class Main {
public static void main(String[] args) {
// 定义字典数据格式: Map<表头名称, Map<Key, Value>>
Map<String, Map<Integer, String>> dictData = new LinkedHashMap<>();
// 部门下拉选项（Key 可忽略）
Map<Integer, String> departmentOptions = new HashMap<>();
departmentOptions.put(1, "技术部");
departmentOptions.put(2, "市场部");
departmentOptions.put(3, "财务部");
dictData.put("部门", departmentOptions);
// 职位下拉选项
Map<Integer, String> positionOptions = new HashMap<>();
positionOptions.put(1, "开发工程师");
positionOptions.put(2, "销售经理");
positionOptions.put(3, "会计");
dictData.put("职位", positionOptions);
Employee employee1 = new Employee("张三", "技术部", "开发工程师");
Employee employee2 = new Employee("李四", "市场部", "销售经理");
ArrayList<Employee> list = new ArrayList<>();
list.add(employee1);
list.add(employee2);
ArrayList<Department> list1 = new ArrayList<>();
Department department = new Department("技术部", "技术经理");
Department department1= new Department("技术部", "技术经理");
list1.add(department);
list1.add(department1);
List<List<String>> listHead = new ArrayList<>();
listHead.add(new ArrayList<String>() {{
add("姓名");
}});
listHead.add(new ArrayList<String>() {{
add("部门");
}});
listHead.add(new ArrayList<String>() {{
add("职位");
}});
// 写入 Excel
String fileName = "D:\\idea代码\\demo1\\src\\main\\resources\\output24.xlsx";
ExcelWriter build = EasyExcel.write(fileName)
.build();// 注册处理器
WriteSheet dic = EasyExcel.writerSheet("字典项页").head(Department.class).build();
build.write(list1, dic);
WriteSheet data = EasyExcel.writerSheet("数据页").head(listHead)
.registerWriteHandler(new DynamicDropDownHandler(dictData,listHead)).build();// 写入数据
build.write(list, data);
build.finish();
}
}
