EasyExcel实现导入excel

1.pom.xml配置依赖包

<!-- xls格式excel依赖包 -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.17</version>
</dependency>
<!--xlsx格式excel依赖包-->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.17</version>
</dependency>
<!-- easyexcel依赖包 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>1.1.2-beta5</version>
</dependency>

2.编写excel导入对应实体类

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;

public class TestModel extends BaseRowModel {

	@ExcelProperty(value = "姓名", index = 0)
	private String xm;
	@ExcelProperty(value = "微信号", index = 1)
	private String wxh;
	@ExcelProperty(value = "手机号", index = 2)
	private String sjh;
	
	public String getXm() {
		return xm;
	}
	public void setXm(String xm) {
		this.xm = xm;
	}
	public String getWxh() {
		return wxh;
	}
	public void setWxh(String wxh) {
		this.wxh = wxh;
	}
	public String getSjh() {
		return sjh;
	}
	public void setSjh(String sjh) {
		this.sjh = sjh;
	}
	
}

3.编写导入监听类

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.ExcelHeadProperty;

public class ExcelListener extends AnalysisEventListener {

    //自定义用于暂时存储data
    private List<Object> datas = new ArrayList<>();
    //导入表头
    private String importHeads = "";
    //模版表头
    private String modelHeads = "";
    
    /**
     * 通过 AnalysisContext 对象还可以获取当前 sheet，当前行等数据
     */
    @Override
    public void invoke(Object o, AnalysisContext analysisContext) {
    	Integer currentRowNum = analysisContext.getCurrentRowNum();
    	//获取导入表头，默认第一行为表头
    	if(currentRowNum == 0){
        	try {
        		Map<String,Object> m = objToMap(o);
        		for (Object v : m.values()) {
        			importHeads += String.valueOf(v).trim() + ",";
     			}
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}else{
    		datas.add(o);
    	}
    }

    /**
     * 读取完之后的操作
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
    	//获取模版表头
    	ExcelHeadProperty ehp = analysisContext.getExcelHeadProperty();
    	for(List<String> s : ehp.getHead()){
    		modelHeads += s.get(0) + ",";
    	}
    }

    public List<Object> getDatas() {
        return datas;
    }

    public void setDatas(List<Object> datas) {
        this.datas = datas;
    }

    public String getImportHeads() {
	    return importHeads;
    }

    public void setImportHeads(String importHeads) {
	    this.importHeads = importHeads;
    }

    public String getModelHeads() {
	    return modelHeads;
    }

    public void setModelHeads(String modelHeads) {
	    this.modelHeads = modelHeads;
    }

    //Object转换为Map
    public  Map<String,Object> objToMap(Object obj) throws Exception{
        Map<String,Object> map = new LinkedHashMap<String, Object>();
        Field[] fields = obj.getClass().getDeclaredFields();
        for(Field field : fields){
            field.setAccessible(true);
            map.put(field.getName(), field.get(obj));
        }
        return map;
    }
}

4.编写导入工具类

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.springframework.web.multipart.MultipartFile;

import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;

public class EasyExcelUtil {
	
    /**
     * 读取某个 sheet 的 Excel
     *
     * @param excel    文件
     * @param rowModel 实体类映射，继承 BaseRowModel 类
     * @param sheetNo  sheet 的序号 从1开始
     * @return Excel 数据 list
     */
    public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel) throws IOException {
        return readExcel(excel, rowModel, 1, 1);
    }

    /**
     * 读取某个 sheet 的 Excel
     * @param excel       文件
     * @param rowModel    实体类映射，继承 BaseRowModel 类
     * @param sheetNo     sheet 的序号 从1开始
     * @return Excel 数据 list
     */
    public static Map<String,Object> readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo) throws IOException {
    	Map<String,Object> result = new HashMap<>();
    	ExcelListener excelListener = new ExcelListener();
        ExcelReader reader = getReader(excel, excelListener);
        if (reader == null) {
            return null;
        }
        reader.read(new Sheet(sheetNo, 0, rowModel.getClass()));    
        //校验表头
        Boolean flag = false;
        if(excelListener.getImportHeads().equals(excelListener.getModelHeads())){
        	flag = true;
        }
        result.put("flag", flag);
        result.put("datas", excelListener.getDatas());
        return result;
    }

    /**
     * 读取某个 sheet 的 Excel
     * @param excel       文件
     * @param rowModel    实体类映射，继承 BaseRowModel 类
     * @param sheetNo     sheet 的序号 从1开始
     * @param headLineNum 表头行数，默认为1
     * @return Excel 数据 list
     */
    public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo, int headLineNum) throws IOException {
        ExcelListener excelListener = new ExcelListener();
        ExcelReader reader = getReader(excel, excelListener);
        if (reader == null) {
            return null;
        }
        reader.read(new Sheet(sheetNo, headLineNum, rowModel.getClass()));
        return excelListener.getDatas();
    }
    
    /**
     * 读取指定sheetName的Excel(多个 sheet)
     * @param excel    文件
     * @param rowModel 实体类映射，继承 BaseRowModel 类
     * @return Excel 数据 list
     * @throws IOException 
     */
    public static List<Object> readExcel(MultipartFile excel, BaseRowModel rowModel,String sheetName) throws IOException {
        ExcelListener excelListener = new ExcelListener();
        ExcelReader reader = getReader(excel, excelListener);
        if (reader == null) {
            return null;
        }
        for (Sheet sheet : reader.getSheets()) {
            if (rowModel != null) {
                sheet.setClazz(rowModel.getClass());
            }
            //读取指定名称的sheet
            if(sheet.getSheetName().contains(sheetName)){
            	reader.read(sheet);
            	break;
            }
        }
        return excelListener.getDatas();
    }

    /**
     * 返回 ExcelReader
     * @param excel 需要解析的 Excel 文件
     * @param excelListener new ExcelListener()
     * @throws IOException 
     */
    private static ExcelReader getReader(MultipartFile excel,ExcelListener excelListener) throws IOException {
        String filename = excel.getOriginalFilename();
        if(filename != null && (filename.toLowerCase().endsWith(".xls") || filename.toLowerCase().endsWith(".xlsx"))){
            InputStream is = new BufferedInputStream(excel.getInputStream());
            return new ExcelReader(is, null, excelListener, false);
        }else{
            return null;
        }
    }
    
}

5.业务层调用

//导入excel
@RequestMapping(value = "excelImport", method = {RequestMethod.GET, RequestMethod.POST })
public String excelImport(HttpServletRequest request,Model model,@RequestParam("uploadFile") MultipartFile[] files) throws Exception {		
    if(files != null && files.length > 0){
        MultipartFile file = files[0];
        Map<String,Object> result = EasyExcelUtil.readExcel(file, new TestModel(),1);
        Boolean flag = (Boolean) result.get("flag");
        if(flag){
            List<Object> list = (List<Object>) result.get("datas");    
    	    if(list != null && list.size() > 0){
    	        for(Object o : list){
    		        TestModel xfxx = (TestModel) o;
    		        System.out.println(xfxx.getXm()+"/"+xfxx.getSjh()+"/"+xfxx.getSjh());
    	        }
    	    }
        }else{
            System.out.println("表头格式错误");
        }
    }	
    return "index";
}