javaExcel的导出（简单方法，不用代码写表头）

目录

一.java代码

1.controller层(/exportTradeCreditData)

2.service代码

3.将设计好的excel模板放到指定位置

4.ExcelWriter.write()方法

二.前端Vue代码

1.接口

2.代码

三.Excel模板

1.将对应的字段也就是list中的key放到你想放在的位置（${contract.CITY_NAME}）

2.加入批注

表头批注（jx:area(lastCell = "BB5")）

字段批注（jx:each(items="contracts" var="contract" lastCell="BB5")）

模板需要遍历的最后一行最后一列

---

一.java代码

1.controller层(/exportTradeCreditData)

package com.rhxt.irrmanage.build.control;

import java.io.IOException;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.util.WebUtils;

import com.rhxt.common.swagger.ApiJsonObject;
import com.rhxt.common.swagger.ApiJsonProperty;
import com.rhxt.irrmanage.build.pojo.PmTbFiles;
import com.rhxt.irrmanage.build.service.ExportFileService;
import com.rhxt.util.G4Utils;
import com.rhxt.util.ResponseEnum;
import com.rhxt.util.Result;
import com.rhxt.util.file.FileUploadUtils;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

@RestController
@Api(value = "附件上传及导出",tags = {"附件上传及导出"})
@RequestMapping("/exportFile")
public class ExportFileController {
	
	private static final Logger log = LoggerFactory.getLogger(ExportFileController.class);
	
	@Autowired
	ExportFileService exportFileService;
	
	@Value("${file.upload.filePath}")
    private String path;
	
	//文件服务器地址
	@Value("${file.url}")
    private String localIp;
	
	@ApiOperation(value = "导出", notes = "导出")
	@PostMapping("/exportTradeCreditData")
	public Result apiExport(@ApiJsonObject(name = "exportTradeCreditData", value = {
			@ApiJsonProperty(key = "regionId", example = "", description = "灌区编码", type = "string", required = true),
			@ApiJsonProperty(key = "year", example = "", description = "年份", type = "string", required = true),
			@ApiJsonProperty(key = "state", example = "", description = "灌区类型", type = "string", required = true),
			@ApiJsonProperty(key = "irrName", example = "", description = "灌区名称", type = "string", required = true),
			@ApiJsonProperty(key = "planName", example = "", description = "规划名称", type = "string", required = true),
			@ApiJsonProperty(key = "tableName", example = "", description = "对应文件名", type = "string", required = true),
			@ApiJsonProperty(key = "superRegionId", example = "", description = "上级所属行政区划", type = "string", required = true),
			@ApiJsonProperty(key = "regionType", example = "", description = "用户级别", type = "string", required = true),
			@ApiJsonProperty(key = "selRegionId", example = "", description = "灌区编码", type = "string", required = true),
			})
	HttpServletResponse response, @RequestBody Map map ) throws IOException{
    	if (G4Utils.checkParams(map, "tableName")) {
    		String regionId = G4Utils.getMapValue2String(map, "regionId");
			String year = G4Utils.getMapValue2String(map, "year");
			String state = G4Utils.getMapValue2String(map, "state");
			String irrName = G4Utils.getMapValue2String(map, "irrName");
			String planName = G4Utils.getMapValue2String(map, "planName");
    		String tableName = G4Utils.getMapValue2String(map, "tableName");
    		String superRegionId = G4Utils.getMapValue2String(map, "superRegionId");
    		String regionType = G4Utils.getMapValue2String(map, "regionType");
    		String selRegionId = G4Utils.getMapValue2String(map, "selRegionId");
    		exportFileService.exportTradeCreditData(tableName, response, regionId, year, state, irrName, planName,superRegionId,regionType,selRegionId);
		}
		return null;		
	}
	
	@ApiOperation(value = "附件上传", notes = "附件上传")
	@PostMapping("/uploadFile")
	public Result uploadFile(@ApiJsonObject(name = "queryData", value = {
			@ApiJsonProperty(key = "file", example = "", description = "文件", type = "", required = true),
			@ApiJsonProperty(key = "regionId", example = "", description = "行政区划编码", type = "string", required = true),
			@ApiJsonProperty(key = "objId", example = "", description = "附件关联对象id", type = "string", required = true),
			@ApiJsonProperty(key = "userId", example = "", description = "用户id", type = "string", required = true),
			@ApiJsonProperty(key = "remark", example = "", description = "备注", type = "string", required = true),
			})@RequestParam Map map, HttpServletRequest request) throws IOException{	
		Result result = new Result();
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		List file = null;
		List insertPmFiles = null;
		if (G4Utils.checkParams(map, "regionId", "objId", "userId")) {
			if (isMultipart) {
				String regionId = G4Utils.getMapValue2String(map, "regionId");
				String objId = G4Utils.getMapValue2String(map, "objId");
				String userId = G4Utils.getMapValue2String(map, "userId");
				String remark = G4Utils.getMapValue2String(map, "remark");
				MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
				file = multipartRequest.getFiles("file");
				if (G4Utils.isNotEmpty(file)) {
					try {
						insertPmFiles = FileUploadUtils.insertPmFiles(file, regionId, objId, userId, path, remark);
					} catch (Throwable e) {
						e.printStackTrace();
						log.info("附件上传异常，异常位置：ExportFileController.uploadFile：异常原因：", e);
					}
					if (G4Utils.isNotEmpty(insertPmFiles)) {
						result.setObj(insertPmFiles);
						result.setCode(ResponseEnum.FILE_UPLOAD_SUCCESS.getCode());
						result.setMsg(ResponseEnum.FILE_UPLOAD_SUCCESS.getMsg());
					}else {
						result.setCode(ResponseEnum.FILE_UPLOAD_ERROR.getCode());
						result.setMsg(ResponseEnum.FILE_UPLOAD_ERROR.getMsg());
					}
					
				}
			}
		}else {
			result.setCode(ResponseEnum.PARAM_LOSE_EXCEPTION.getCode());
			result.setMsg(ResponseEnum.PARAM_LOSE_EXCEPTION.getMsg());
		}
		
		return result;		
	}
	
	@ApiOperation(value = "附件删除", notes = "附件删除")
	@PostMapping("/deleteFileById")
	public Result deleteFileById(@ApiJsonObject(name = "deleteFileById", value = {
			@ApiJsonProperty(key = "id", example = "", description = "文件id", type = "", required = true)
	})@RequestBody Map map) throws IOException{	
		Result result = new Result();
		if (G4Utils.checkParams(map, "id")) {
			String id = G4Utils.getMapValue2String(map, "id");
			result.setObj(exportFileService.deleteFile(id));
			result.setCode(ResponseEnum.DELETE_SUCCESS.getCode());
			result.setMsg(ResponseEnum.DELETE_SUCCESS.getMsg());
		}else {
			result.setCode(ResponseEnum.PARAM_LOSE_EXCEPTION.getCode());
			result.setMsg(ResponseEnum.PARAM_LOSE_EXCEPTION.getMsg());
		}
		
		return result;		
	}
	
	@ApiOperation(value = "附件查看", notes = "附件查看")
	@PostMapping("/selectFileById")
	public Result selectFileById(@ApiJsonObject(name = "selectFileById", value = {
			@ApiJsonProperty(key = "id", example = "", description = "附件关联对象id", type = "", required = true)
	})@RequestBody Map map) throws IOException{	
		Result result = new Result();
		if (G4Utils.checkParams(map, "id")) {
			String id = G4Utils.getMapValue2String(map, "id");
			result.setObj(exportFileService.selectFileById(id, localIp));
		}else {
			result.setCode(ResponseEnum.PARAM_LOSE_EXCEPTION.getCode());
			result.setMsg(ResponseEnum.PARAM_LOSE_EXCEPTION.getMsg());
		}
		
		return result;		
	}
}

2.service代码

package com.rhxt.irrmanage.build.service.impl;

import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.rhxt.irrmanage.build.dao.PmTbFilesMapper;
import com.rhxt.irrmanage.build.service.ExportFileService;
import com.rhxt.irrmanage.build.service.IPmTbBiddingInfoService;
import com.rhxt.irrmanage.build.service.IPmTbFeasibilityPlanService;
import com.rhxt.irrmanage.build.service.IPmTbInvestPlanReleaseService;
import com.rhxt.irrmanage.build.service.IPmTbProjectAcceptanceService;
import com.rhxt.irrmanage.build.service.IPmTbProjectPlanService;
import com.rhxt.irrmanage.build.service.IPmTbProjectProgressService;
import com.rhxt.irrmanage.build.service.IPmTbProjectProposalService;
import com.rhxt.irrmanage.build.service.IPmTbReplyBuildService;
import com.rhxt.irrmanage.build.service.IPmTbReplyDesignService;
import com.rhxt.irrmanage.build.service.PmTbProjectStartService;
import com.rhxt.util.ExcelWriter;
import com.rhxt.util.G4Utils;

@Service
public class ExportFileServiceImpl implements ExportFileService {

	private static final Logger log = LoggerFactory.getLogger(ExportFileServiceImpl.class);
	
	@Autowired
	IPmTbProjectProposalService IPmTbProjectProposalService;
	
	@Autowired
	IPmTbProjectPlanService iPmTbProjectPlanService;
	
	@Autowired
	IPmTbBiddingInfoService iPmTbBiddingInfoService;
	
	@Autowired
	IPmTbFeasibilityPlanService iPmTbFeasibilityPlanService;
	
	@Autowired
	IPmTbInvestPlanReleaseService iPmTbInvestPlanReleaseService;
	
	@Autowired
	IPmTbProjectAcceptanceService iPmTbProjectAcceptanceService;
	
	@Autowired
	IPmTbProjectProgressService iPmTbProjectProgressService;
	
	@Autowired
	PmTbProjectStartService pmTbProjectStartService;
	
	@Autowired
	IPmTbReplyBuildService iPmTbReplyBuildService;
	
	@Autowired
	IPmTbReplyDesignService iPmTbReplyDesignService;
	
	@Autowired
	PmTbFilesMapper pmTbFilesMapper;
	
	@Override
	public void exportTradeCreditData(String tableName, HttpServletResponse response, String regionId, String year,
		String state, String irrName, String planName, String superRegionId, String regionType,String selRegionId) {
		Map data = new HashMap<>();
		String fn = "";
		switch (tableName) {
		case "pmTbProjectProposal": //项目建议书 √
			fn = "pmTbProjectProposal";
			List> proposalList = IPmTbProjectProposalService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", proposalList);
			break;
		case "pmTbProjectPlan": //规划报告 √
			fn = "pmTbProjectPlan";
			List> proPlanList = iPmTbProjectPlanService.queryData(regionId, year, state, irrName, planName,superRegionId,regionType,"", selRegionId);
			data.put("contracts", proPlanList);
			break;
		case "pmTbFeasibilityPlan":  //可行性研究 √
			fn = "pmTbFeasibilityPlan";
			List> feaPlanList = iPmTbFeasibilityPlanService.queryData(regionId, year, state, irrName,superRegionId,regionType,"", selRegionId);
			data.put("contracts", feaPlanList);
			break;
		case "pmTbReplyDesign": //初步设计 √
			fn = "pmTbReplyDesign";
			List> replyDesList = iPmTbReplyDesignService.queryData(regionId, year, state, irrName,superRegionId,regionType,"", selRegionId);
			data.put("contracts", replyDesList);
			break;
		case "pmTbReplyBuild": //年度实施方案 √
			fn = "pmTbReplyBuild";
			List> replyBuildList = iPmTbReplyBuildService.queryData(regionId, year, state, irrName,superRegionId,regionType,"", selRegionId);
			data.put("contracts", replyBuildList);
			break;
		case "pmTbInvestPlanRelease": //年度投资计划下达 √
			fn = "pmTbInvestPlanRelease";
			List> invPlanList = iPmTbInvestPlanReleaseService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", invPlanList);
			break;
		case "pmTbBiddingInfo": //招投标  √
			fn = "pmTbBiddingInfo";
			List> biddingList = iPmTbBiddingInfoService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", biddingList);
			break;
		case "pmTbProjectStart": //开工报验 √
			fn = "pmTbProjectStart";
			List> proStartList = pmTbProjectStartService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", proStartList);
			break;
		case "pmTbProjectProgress": //建设进度 √
			fn = "pmTbProjectProgress";
			List> progressList = iPmTbProjectProgressService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", progressList);
			break;
		case "pmTbProjectAcceptance": //验收管理 √
			fn = "pmTbProjectAcceptance";
			List> proAccList = iPmTbProjectAcceptanceService.queryData(regionId, year, state, irrName,superRegionId,regionType, selRegionId);
			data.put("contracts", proAccList);
			break;
		
		default:
			break;
		}
		
		 try {		
			 response.setContentType("application/vnd.ms-excel");
			 response.setHeader("Content-disposition", "attachment;filename="+new String(("测试导出信息_"+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()).toString() +".xlsx").getBytes(), "iso-8859-1"));
			 OutputStream out = response.getOutputStream();
			 
			//重点 工具类
			ExcelWriter.write(this.getClass().getClassLoader().getResourceAsStream("export/build/"+fn+".xlsx"), out, data);
		} catch (Exception e) {
//			log.warning(e.getMessage());
			e.printStackTrace();
		}
	}

	@Override
	public int deleteFile(String id) {
		int count = 0;
		try {
			count = pmTbFilesMapper.deleteByPrimaryKey(id);
		} catch (Exception e) {
			log.info("删除附件异常，异常位置：ExportFileServiceImpl.deleteFile：异常原因：", e);
		}
		
		return count;
	}

	@Override
	public List> selectFileById(String id, String localIp) {
		List> fileList= pmTbFilesMapper.selectFileById(id);
		for (Map map : fileList) {
			map.put("url", localIp + G4Utils.getMapValue2String(map, "filePath"));
		}
		return fileList;
	}
		

	
}

3.将设计好的excel模板放到指定位置

4.ExcelWriter.write()方法

package com.rhxt.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;

import org.jxls.common.Context;
import org.jxls.util.JxlsHelper;

/**
 * 通过模板导出Excel的工具
 * @author Dylan
 *
 */
public class ExcelWriter {
	
	/**
	 * 根据模板输出Excel文件
	 * @param templateInputStream 模板输入流
	 * @param out 要写入的流，一般为文件流或网络流
	 * @param vars 上下文变量
	 * @throws IOException
	 */
	public static void write(InputStream templateInputStream, OutputStream out, Map vars) throws IOException {
		Context context = new Context(vars);		
		JxlsHelper.getInstance().processTemplate(templateInputStream, out, context);
	}
	
	/**
	 * 根据模板输出Excel文件
	 * @param templateFile 模板文件
	 * @param out 要写入的流，一般为文件流或网络流
	 * @param vars 上下文变量
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static void write(File templateFile, OutputStream out, Map vars) throws FileNotFoundException, IOException {
		try (InputStream templateInputStream = new FileInputStream(templateFile)) {
			write(templateInputStream, out, vars);
		}
		
	}
	
	/**
	 * 根据模板输出Excel文件
	 * @param templateFileName 模板文件全名，包含路径
	 * @param out 要写入的流，一般为文件流或网络流
	 * @param vars 上下文变量
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static void write(String templateFileName, OutputStream out, Map vars) throws FileNotFoundException, IOException {
		try (InputStream templateInputStream = new FileInputStream(templateFileName)) {
			write(templateInputStream, out, vars);
		}
		
	}

}

二.前端Vue代码

1.接口

//项目管理表格导出 
    post_XMJYS_exportData:(data) => axios.post(`${proHost}/GDXXH/exportFile/exportTradeCreditData`,data,{
        responseType:'blob',
        headers: {'Content-Type': 'application/json'},
    }),

2.代码

//项目管理 表格导出
async handleExportData({commit}, option){
        let data = {
            ...option,
        }
        let res = await api.post_XMJYS_exportData(data);
        exportDown(res, option.fileName);
    },
// 文件下载
const exportDown = (data, name) =>{
    const blob = new Blob([data], { type: "application/xls" });
    const elink = document.createElement("a");
    elink.download = name + ".xls";
    elink.style.display = "none";
    elink.href = URL.createObjectURL(blob);
    document.body.appendChild(elink);
    elink.click();
    URL.revokeObjectURL(elink.href); // 释放URL对象
    document.body.removeChild(elink);
}

三.Excel模板

1.将对应的字段也就是list中的key放到你想放在的位置（${contract.CITY_NAME}）

 2.加入批注

表头批注（jx:area(lastCell = "BB5")）

字段批注（jx:each(items="contracts" var="contract" lastCell="BB5")）

模板需要遍历的最后一行最后一列