导出html文件数据

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前言

springBoot项目实现在线导出html文件数据的功能。

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一、实现代码

1.controller层

@GetMapping("/record/_export")
@ApiOperation("查询记录导出")
public void recordExport(HttpServletResponse response, RecordSearchRequest query) throws IOException {ruleVerifyResultService.recordExport(response, query);}

RecordSearchRequest为请求查询条件，根据条件导出对应的记录。

2.接口层

public interface ResultService extends IService<RuleVerifyResultEntity> {/*** 记录导出* @param query* @return*/void recordExport(HttpServletResponse response, RecordSearchRequest query) throws IOException;
}

3.接口实现类

@Override
public void queryRecordExport(HttpServletResponse response, RuleVerifyRecordSearchRequest query) throws IOException {LocalDateTime startExecuteTime = null;LocalDateTime endExecuteTime = null;//设置导出文件名称String fileName = "检验记录列表数据";if (ObjectUtils.isNotEmpty(query.getExecuteStartTime())) {startExecuteTime = query.getExecuteStartTime().atStartOfDay();endExecuteTime = query.getExecuteStartTime().atTime(23, 59, 59);}//查询需要导出的数据，用list集合接收List<RuleVerifyRecordEntity> recordList = ruleVerifyRecordMapper.selectList(Wrappers.<RuleVerifyRecordEntity>lambdaQuery().// 关键字搜索and(StringUtils.isNotEmpty(query.getKeywords()), wrapper -> wrapper.like(RuleVerifyRecordEntity::getTableName, query.getKeywords()).or().like(RuleVerifyRecordEntity::getTableRemark, query.getKeywords()).or().like(RuleVerifyRecordEntity::getDatasourceName, query.getKeywords()))orderByDesc(RuleVerifyRecordEntity::getExecuteStartTime));//2.导出html数据if (ObjectUtils.equals(ExportTypeEnum.HTML.getValue(), query.getExportType())) {//构建文件信息StringBuilder table = this.buildTableInfo(recordList);InputStream inputStream = null;FileInputStream fileInputStream = null;ServletOutputStream outputStream = null;try {//string字符串转输入流inputStream = FileUtil.getInputStream(table.toString());//字节输入流转文件输入流fileInputStream = FileUtil.convertToFileInputStream(inputStream);//给浏览器设置响应头：Content-Disposition告诉浏览器以附件的形式打开这个文件response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".html", "UTF-8"));//给浏览器设置响应头：文件类型response.setContentType("application/octet-stream;charset=utf-8");//从response中获取输出流outputStream = response.getOutputStream();//进行流拷贝操作FileUtil.copyStream(fileInputStream, outputStream);outputStream.flush();} catch (IOException e) {log.error(e.getMessage());e.printStackTrace();} finally {//关闭资源文件try{inputStream.close();fileInputStream.close();outputStream.close();}catch(Exception e){e.printStackTrace();}}}private StringBuilder buildTableInfo(List<RuleVerifyRecordEntity> recordList){StringBuilder table = new StringBuilder();// 添加table标签table.append("<table>\n");// 生成表头table.append("<tr>\n");table.append("<th>" + "表名称" + "</th>");table.append("<th>" + "规则异常" + "</th>");table.append("<th>" + "执行状态" + "</th>");table.append("<th>" + "调度信息" + "</th>");table.append("<th>" + "开始时间" + "</th>");table.append("<th>" + " " + "</th>\n");table.append("<th>" + "结束时间" + "</th>");table.append("</tr>\n");// 生成HTML表格// 生成表格数据for (RuleVerifyRecordEntity row : recordList) {table.append("<tr>\n");table.append("<td>" + row.getTableName() + "</td>\n");table.append("<td>" + row.getRuleCount()) + "</td>\n");table.append("<td>" + (ObjectUtils.isNotEmpty(row.getExecuteStatus()) ? row.getExecuteStatus().toString() : null) + "</td>\n");table.append("<td>" + row.getSchedulerInfo() + " " + "</td>\n");table.append("<td>" + DateTimeUtil.toDateTimeStr(ObjectUtils.isNotEmpty(row.getExecuteStatus()) ? row.getExecuteStartTime() : LocalDateTime.now()) + "</td>\n");table.append("<td>" + " " + "</td>\n");table.append("<td>" + DateTimeUtil.toDateTimeStr(ObjectUtils.isNotEmpty(row.getExecuteEndTime()) ? row.getExecuteEndTime() : LocalDateTime.now()) + "</td>\n");table.append("</tr>\n");}table.append("</table>");return table;}
}

4.FileUtil 工具类

import javax.servlet.ServletOutputStream;
import java.io.*;
import java.nio.charset.StandardCharsets;public class FileUtil {//string字符串转输入流public static InputStream getInputStream(String str) {if (str != null && !"".equals(str.trim())) {try {ByteArrayInputStream inputStream = new ByteArrayInputStream(str.getBytes(StandardCharsets.UTF_8));return inputStream;} catch (Exception e) {e.printStackTrace();}}return null;}//字节输入流转文件输入流public static FileInputStream convertToFileInputStream(InputStream inputStream) throws IOException {File tempFile = File.createTempFile("temp", ".tmp");tempFile.deleteOnExit();try (FileOutputStream outputStream = new FileOutputStream(tempFile)) {byte[] buffer = new byte[1024];int bytesRead;while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);}}return new FileInputStream(tempFile);}//数据写入输出流public static void copyStream(FileInputStream fileInputStream, ServletOutputStream outputStream) throws IOException {int len = 0;byte[] arr = new byte[1024];while ((len = fileInputStream.read(arr)) != -1) {outputStream.write(arr, 0, len);}}
}

二、文件导出效果

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总结

本次实现了html文件的导出功能，下节接着实现xml文件的导出功能。