标签：return easyExcel param public 好用 static import 工具 response
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.read.metadata.ReadSheet;
import com.alibaba.excel.write.handler.WriteHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.*;
@Slf4j
public class ExcelUtils {
private static final String FILE_SUFFIX = ".xlsx";
/**
* 导出excel
* @param response
* @param fileName 文件名
* @param sheetName sheet名
* @param list 数据 list为空返回 空Excel
*/
public static void export(HttpServletResponse response, String fileName, String sheetName, List<?> list, Class<?> zlass) throws Exception {
response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
String fileNameCode = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
response.setHeader("Content-disposition", "attachment;filename=" + fileNameCode + FILE_SUFFIX);
EasyExcel.write(response.getOutputStream(), zlass)
.sheet(sheetName).doWrite(list);
}
/**
* excel导出 批注
* @param response
* @param fileName 文件名
* @param list 导出数据
* @param writeHandler 批注拦截器
*/
public static void export(HttpServletResponse response, String fileName,
List list, WriteHandler writeHandler, Class zlass) throws Exception {
response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
String fileNameCode = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
response.setHeader("Content-disposition", "attachment;filename=" + fileNameCode + FILE_SUFFIX);
EasyExcel.write(response.getOutputStream(), zlass)
.inMemory(Boolean.TRUE).registerWriteHandler(writeHandler)
.sheet(fileName).doWrite(list);
}
/**
* 导出Excel
* @param response
* @param fileName 文件名
* @param list 导出数据
* @return void
*/
public static void export(HttpServletResponse response, String fileName, List<?> list, Class<?> zlass) throws Exception {
export(response, fileName, fileName, list, zlass);
}
/**
* 读取excel文件
* @param file 文件
* @param clazz 模板类
* @return java.util.List
*/
public static <T> List<T> read(MultipartFile file, Class<T> clazz) {
try {
return EasyExcel.read(new BufferedInputStream(file.getInputStream())).head(clazz).sheet()
.doReadSync();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static List<LinkedHashMap<Integer, Object>> readExcel(InputStream inputStream) {
return EasyExcel.read(inputStream).headRowNumber(0).autoCloseStream(true).doReadAllSync();
}
public static List<LinkedHashMap<Integer, Object>> readExcel(InputStream inputStream, String sheetName) {
return EasyExcel.read(inputStream).headRowNumber(0).autoCloseStream(true).sheet(sheetName).doReadSync();
}
public static List<LinkedHashMap<Integer, Object>> readExcel(InputStream inputStream, Integer sheetIndex) {
return EasyExcel.read(inputStream).headRowNumber(0).autoCloseStream(true).sheet(sheetIndex).doReadSync();
}
public static Map<String, List<LinkedHashMap<Integer, Object>>> readNameExcel(InputStream inputStream, List<ReadSheet> readSheets) {
SyncManySheetNameReadListener syncReadListener = new SyncManySheetNameReadListener();
EasyExcel.read(inputStream).registerReadListener(syncReadListener).autoCloseStream(true)
.build().read(readSheets).finish();
return syncReadListener.getMap();
}
public static Map<Integer, List<LinkedHashMap<Integer, Object>>> readIndexExcel(InputStream inputStream, List<ReadSheet> readSheets) {
SyncManySheetIndexReadListener syncReadListener = new SyncManySheetIndexReadListener();
EasyExcel.read(inputStream).registerReadListener(syncReadListener).autoCloseStream(true)
.build().read(readSheets).finish();
return syncReadListener.getMap();
}
public static Map<String, List<LinkedHashMap<Integer, Object>>> readExcel(List<String> sheetNames, InputStream is) {
Map<String, List<LinkedHashMap<Integer, Object>>> data;
if(DataUtils.isEmpty(sheetNames)) {
data = new HashMap<>();
data.put("", ExcelUtils.readExcel(is));
} else {
List<ReadSheet> list = new ArrayList<>();
for(String name : sheetNames) {
list.add(new ReadSheet(null, name));
}
data = readNameExcel(is, list);
}
return data;
}
public static String getAsString(LinkedHashMap<Integer, Object> cell, int i) {
Object o = cell.get(i);
if(o == null) {
return null;
}
return o.toString();
}
private static class SyncManySheetNameReadListener extends AnalysisEventListener<Object> {
private Map<String, List<LinkedHashMap<Integer, Object>>> map = new HashMap<>();
public SyncManySheetNameReadListener() { }
public void invoke(Object object, AnalysisContext context) {
map.computeIfAbsent(context.readSheetHolder().getSheetName(),
a -> new ArrayList<>()).add((LinkedHashMap<Integer, Object>) object);
}
public void doAfterAllAnalysed(AnalysisContext context) { }
public Map<String, List<LinkedHashMap<Integer, Object>>> getMap() {
return this.map;
}
}
private static class SyncManySheetIndexReadListener extends AnalysisEventListener<Object> {
private Map<Integer, List<LinkedHashMap<Integer, Object>>> map = new HashMap<>();
public SyncManySheetIndexReadListener() { }
public void invoke(Object object, AnalysisContext context) {
map.computeIfAbsent(context.readSheetHolder().getSheetNo(),
a -> new ArrayList<>()).add((LinkedHashMap<Integer, Object>) object);
}
public void doAfterAllAnalysed(AnalysisContext context) { }
public Map<Integer, List<LinkedHashMap<Integer, Object>>> getMap() {
return this.map;
}
}
}
标签：return,easyExcel,param,public,好用,static,import,工具,response 来源： https://www.cnblogs.com/math-and-it/p/15084790.html
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