这篇文章简单介绍一下怎么通过easyexcel做数据的导出，使用之前easyui构建的歌曲列表crud应用，添加一个导出按钮，点击的时候直接连接后端接口地址，在后端的接口完成数据的导出功能。
前端页面完整代码
let editingId;
let requestUrl;
let base = "http://localhost:8083";
let pageList = [20, 50, 100, 500, 1000];
// 定义一个json对象保存歌曲数据
let data = {};
function addHandler() {
requestUrl = "/song/insert";
$.post(base + requestUrl, {
name: "*****",
singer: "*****",
note: "*****"
}, function () {
$("#song_list").datagrid("reload");
}, "json");
}
function editHandler() {
let datagrid = $("#song_list");
let row = datagrid.datagrid("getSelected");
if (editingId != null && editingId != "") {
datagrid.datagrid("selectRow", editingId);
} else {
if (row) {
// 获取行索引，这个索引从0开始
let rowIndex = datagrid.datagrid("getRowIndex", row);
editingId = rowIndex;
requestUrl = "/song/updateById";
datagrid.datagrid("beginEdit", rowIndex);
}
}
}
function saveHandler() {
if (editingId) {
// 只有结束编辑才能获取到最新的值
$("#song_list").datagrid("endEdit", editingId);
$.post(base + requestUrl, data, function (res) {
$.messager.show({
title: '系统消息',
timeout: 5000,
showType: 'slide',
msg: res.message,
});
editingId = "";
}, "json");
}
}
function cancelHandler() {
// editingId != null条件防止刷新页面带来的问题
if (editingId != null && editingId !== "") {
$("#song_list").datagrid("cancelEdit", editingId);
editingId = "";
}
}
function exportHandler() {
location.href = base + "/song/export";
}
function deleteHandler() {
let rowData = $("#song_list").datagrid("getSelected");
if (rowData) {
$.messager.confirm("提示", "删除后数据无法恢复，是否确认删除？", function(bool) {
if (bool) {
$.get(base + "/song/deleteById/" + rowData.id, {}, function(res) {
$.messager.show({
title: '系统消息',
timeout: 5000,
showType: 'slide',
msg: res.message,
});
$("#song_list").datagrid("reload");
}, "json");
}
});
} else {
$.messager.alert("请选择要删除的数据！", "warning");
}
}
$(document).ready(function() {
let datagrid = $("#song_list").datagrid({
url: base + "/song/selectByPage",
title: "歌曲列表",
height: 810,
striped: true,
fitColumns: true,
singleSelect: true,
pagination: true,
remoteFilter: true,
clientPaging: false,
pageSize: pageList[0],
pageList: pageList,
loadFilter: function(res) {
if (res.code == 200) {
return res.data;
} else {
return null;
}
},
onAfterEdit: function (rowIndex, rowData, changes) { // 结束行内编辑事件
data = {
id: rowData.id,
name: changes.name ? changes.name : rowData.name,
note: changes.note ? changes.note : rowData.note,
singer: changes.singer ? changes.singer : rowData.singer
};
},
toolbar: [{
iconCls: 'icon-add',
text: '添加',
handler: function() {
addHandler();
}
}, '-', {
iconCls: 'icon-edit',
text: '修改',
handler: function() {
editHandler();
},
}, "-", {
iconCls: "icon-save",
text: "保存",
handler: function() {
saveHandler();
}
}, "-", {
iconCls: "icon-cancel",
text: "取消",
handler: function() {
cancelHandler();
}
}, '-', {
iconCls: 'icon-ok',
text: '导出',
handler: function() {
exportHandler();
}
}, '-', {
iconCls: 'icon-delete',
text: '删除',
handler: function() {
deleteHandler();
},
}],
columns: [[
{field: 'id', title: 'id', width: 200},
{field: 'name', title: 'name', width: 200, editor: "textbox"},
{field: 'singer', title: 'singer', width: 200, editor: "textbox"},
{field: 'note', title: 'note', width: 200, editor: "textbox"},
{field: 'lastUpdateTime', title: 'lastUpdateTime', width: 200},
]]
});
datagrid.datagrid('enableFilter', [{
field: 'name',
type: 'textbox',
op: ['equal', 'contains']
}, {
field: 'singer',
type: 'textbox',
op: ['equal', 'contains'],
}, {
field: 'note',
type: 'textbox',
op: ['equal', 'contains']
}]);
});添加依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>3.3.2</version>
</dependency>修改实体类，添加列注解
package com.example.springboot.entity;
import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import java.io.Serializable;
import java.time.LocalDateTime;
/**
* 歌曲
* @author heyunlin
* @version 1.0
*/
@Data
@TableName("song")
public class Song implements Serializable {
private static final long serialVersionUID = 18L;
@ExcelIgnore
@TableId(type = IdType.INPUT)
private String id;
/**
* 歌曲名
*/
@ExcelProperty("歌曲名")
private String name;
/**
* 歌手
*/
@ExcelProperty("歌手")
private String singer;
/**
* 描述信息
*/
@ExcelProperty("描述信息")
private String note;
/**
* 最后一次修改时间
*/
@TableField("last_update_time")
@ExcelProperty("最后一次修改时间")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private LocalDateTime lastUpdateTime;
}参考官网的案例代码，完成后端controller接口具体代码实现
package com.example.springboot.service.impl;
import com.alibaba.excel.EasyExcel;
import com.example.springboot.entity.Song;
import com.example.springboot.mapper.SongMapper;
import com.example.springboot.restful.JsonResult;
import com.example.springboot.service.SongService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
/**
* @author heyunlin
* @version 1.0
*/
@Service
public class SongServiceImpl implements SongService {
private final SongMapper songMapper;
@Autowired
public SongServiceImpl(SongMapper songMapper) {
this.songMapper = songMapper;
}
// 其他代码...
@Override
public void export(HttpServletResponse response) {
String fileName = "song.xlsx";
response.setCharacterEncoding("utf-8");
response.setHeader("Content-disposition", "attachment;filename=" + fileName);
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
try {
List<Song> songs = songMapper.selectList(null);
EasyExcel.write(response.getOutputStream(), Song.class).sheet("歌曲列表").doWrite(songs);
} catch (Exception e) {
e.printStackTrace();
response.reset();
response.setContentType("application/json;charset=utf-8");
JsonResult<Void> jsonResult = JsonResult.success("数据导出异常");
try {
response.getWriter().write(jsonResult.toString());
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
}代码已经同步到后端项目的springbooot-crud1.0分支，可按需获取~
springboot+mybatis实现简单的增删查改案例项目 
https://gitee.com/he-yunlin/springboot-crud.git
