easyexcel 工具类_getresourcesfileinputstream 引入架包-优快云博客

本文链接：https://blog.youkuaiyun.com/SakeOfWhat/article/details/98479991

本文介绍了如何使用EasyExcel工具类进行Excel数据的读写操作。通过`ExcelUtil.java`提供的静态方法，可以方便地完成文件读取和数据转换。同时，`ExcelListener.java`作为监听器处理读取事件，而`ExcelBean.java`定义了数据模型。在`pom.xml`中引入EasyExcel的依赖，即可在项目中便捷地进行Excel操作。

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ExcelUtil.java

import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;
import edu.abc.ssm.bean.ExcelBean;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

/*easyexcel 导入导出工具类*/
public class ExcelUtil {

    /*按List<String> 读取*/
    public List<Object> readExcel(String filePath){
        InputStream inputStream = FileUtil.getResourcesFileInputStream(filePath);
        if (null == inputStream) {
            throw new NullPointerException("the inputStream is null!");
        }

        final List<Object> rows = new ArrayList<Object>();
        ExcelReader reader = new ExcelReader(inputStream, ExcelTypeEnum.XLSX, new AnalysisEventListener() {
            @Override
            public void invoke(Object o, AnalysisContext analysisContext) {
                rows.add(o);
            }

            @Override
            public void doAfterAllAnalysed(AnalysisContext analysisContext) {

            }
        }, false);
        reader.read(new Sheet(1, 1));

        try {
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return rows;
    }

    /*按model 读取*/
    public <T extends BaseRowModel> List<T> readModelExcel(String filePath, Class<? extends BaseRowModel> clazz){
        InputStream inputStream = FileUtil.getResourcesFileInputStream(filePath);
        if (null == inputStream) {
            throw new NullPointerException("the inputStream is null!");
        }

        ExcelListener<T> excelListener = new ExcelListener();
        ExcelReader reader = new ExcelReader(inputStream, ExcelTypeEnum.XLSX,  excelListener, false);
        reader.read(new Sheet(1, 1, clazz));

        try {
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return excelListener.getRows();
    }

    /*按model 写出*/
    public void writeExcel(String filePath, List<? extends BaseRowModel> datas){
        OutputStream outputStream = null;
        try {
            outputStream = new FileOutputStream(new File(filePath));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        Class<? extends BaseRowModel> t = datas.get(0).getClass();
        System.out.println("ModelType:" + t);
        Sheet sheet1 = new Sheet(1, 0, t);

        ExcelWriter writer = new ExcelWriter(outputStream, ExcelTypeEnum.XLSX,true);
        writer.write(datas, sheet1);
        writer.finish();
    }


    public static void main(String[] args) {
        ExcelUtil excelUtil = new ExcelUtil();
//        List<Object> data = excelUtil.readExcel("test.xlsx");
//        for (Object ob:data) {
//            System.out.println(ob);
//        }


        //测试数据
//        List<ExcelBean> excelModelList = new ArrayList<ExcelBean>();
//        for (int i = 0; i < 100; i++) {
//            ExcelBean excelModel = new ExcelBean();
//            excelModel.setUserId(i);
//            excelModel.setUserName("name" + i);
//            excelModelList.add(excelModel);
//        }
//        excelUtil.writeExcel("outtest.xlsx", excelModelList);

        List<ExcelBean> data = excelUtil.readModelExcel("outtest.xlsx", ExcelBean.class);
        print(data);
    }

    public static void print(List<? extends BaseRowModel> datas){
        for (Object ob:datas) {
            System.out.println(ob);
        }
    }
}

ExcelListener.java

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.BaseRowModel;
import java.util.ArrayList;
import java.util.List;

public class ExcelListener<T extends BaseRowModel> extends AnalysisEventListener<T> {
    /**
     * 暂时存储data
     */
    private List<T> rows = new ArrayList<T>();

    /**
     * 解析每行都回调invoke()方法
     * @param object
     * @param context
     */
    public void invoke(T object, AnalysisContext context) {
        rows.add(object);
    }

    public void doAfterAllAnalysed(AnalysisContext context) {
        //解析结束销毁不用的资源
    }

    public List<T> getRows(){
        return rows;
    }
}

ExcelBean.java

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

/*easyexcel 数据导出model*/
public class ExcelBean extends BaseRowModel{

    @ExcelProperty(value = "ID", index = 0)
    private int userId;

    @ExcelProperty(value = "姓名", index = 1)
    private String userName;

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    @Override
    public String toString() {
        return "ExcelBean{" +
                "userId=" + userId +
                ", userName='" + userName + '\'' +
                '}';
    }
}

pom.xml

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>1.1.2-beta5</version>
</dependency>