本文实例讲述了Java使用excel工具类导出对象功能。分享给大家供大家参考，具体如下：
package com.gcloud.common;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import java.io.FileOutputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Created by charlin on 2017/9/7.
*/
public class ExcelExportUtil {
// 1、定义工作表
private SXSSFWorkbook workbook;
// 2、定义sheet
private Sheet sheet;
// 3、定义保存在内存中的数量,-1表示手动控制
private int flushRows;
/**
* 4、导出文件行数
*/
private int rowNum;
/**
* 5、导出文件列数
*/
private int colNum;
/**
* 6、导出文件的存放路径
*/
private String filePath;
/**
* 7、下载导出文件的路径
*/
private String fileWebPath;
/**
* 8、文件名称前缀
*/
private String filePrefix;
/**
* 9、导出文件全路径
*/
private String fileAllPath;
/**
* 10、导出文件列标题
*/
private List<String> fieldNames;
/**
* 11、导出文件每列代码，用于反射获取对象属性值
*/
private List<String> fieldCodes;
//---构造方法-----------------------------------------
public ExcelExportUtil() {
}
public ExcelExportUtil(SXSSFWorkbook workbook) {
this.workbook = workbook;
}
public static ExcelExportUtil start(String filePath, String fileWebPath, String filePrefix, List<String> fieldNames, List<String> fieldCodes, int flushRows) throws Exception {
ExcelExportUtil excelExportUtil = new ExcelExportUtil();
excelExportUtil.setFilePath(filePath);
excelExportUtil.setFileWebPath(fileWebPath);
excelExportUtil.setFilePrefix(filePrefix);
excelExportUtil.setFieldNames(fieldNames);
excelExportUtil.setFieldCodes(fieldCodes);
//设置输出行数
excelExportUtil.setWorkbook(new SXSSFWorkbook(flushRows));
//设置sheet
excelExportUtil.setSheet(excelExportUtil.getWorkbook().createSheet());
excelExportUtil.writeTitles();
return excelExportUtil;
}
/**
* 创建标题
*
* @throws Exception
*/
public void writeTitles() throws Exception {
rowNum = 0;
colNum = fieldNames.size();
//创建行
Row row = sheet.createRow(rowNum);
//在每列第一行输出标题
for (int i = 0; i < colNum; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(fieldNames.get(i));
}
}
/**
* 写入对象数据
*
* @param datalist
* @throws Exception
*/
public void writeDatas(List datalist) throws Exception {
for (int i = 0; i < datalist.size(); i++) {
rowNum++;
//不断创建行
Row row = sheet.createRow(rowNum);
for (int j = 0; j < fieldCodes.size(); j++) {
Object obj = datalist.get(j);
//获得get方法返回的值
Object value = invokeMethod(obj, fieldCodes.get(j), new Object[]{});
Cell cell = row.createCell(j);
cell.setCellValue(value != null ? value.toString() : "");
}
}
}
/**
* 获得get方法返回的值
* @param owner
* @param fieldname
* @param args
* @return
* @throws Exception
*/
private Object invokeMethod(Object owner, String fieldname, Object[] args) throws Exception {
String methodName = "get" + fieldname.substring(0,1).toUpperCase() + fieldname.substring(1);
Class ownerClass = owner.getClass();
Class[] argsClass = new Class[args.length];
for (int i = 0, j = argsClass.length ; i <j ; i++) {
argsClass[i] = args[i].getClass();
}
Method method = ownerClass.getMethod(methodName, argsClass);
return method.invoke(owner, args);
}
/**
* 向导出文件写数据
*
* @param datalist 存放字符串数组
* @return
*/
public void writeDatasByStr(List<String> datalist) throws Exception {
rowNum++;
Row row = sheet.createRow(rowNum);
int dataSize = datalist.size();
for (int i = 0; i < colNum; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(dataSize > i ? datalist.get(i) : "");
}
}
/**
* 手动刷新方法,如果flushRows为-1则需要使用此方法手动刷新内存
* @param flushNum
* @throws Exception
*/
public void flush(int flushNum) throws Exception{
((SXSSFSheet)sheet).flushRows(flushNum);
}
/**
* 导出文件
* @return
* @throws Exception
*/
public String exportFile() throws Exception{
String fileName = filePrefix + "_" + DateUtil.getCurrentTimeFileName() + ".xlsx";
FileOutputStream fos = new FileOutputStream(filePath + fileName);
workbook.write(fos);
fos.close();
setFileAllPath(fileWebPath + fileName);
return fileWebPath + fileName;
}
/**
* 导出excel通用方法
* @param field
* @param path
* @param webpath
* @param filePrefix
* @param datas
* @param flushRows
* @return
* @throws Exception
*/
public ExcelExportUtil excelExport(String field,String path,String webpath,String filePrefix,List datas,int flushRows) throws Exception{
//导出字段代码和名称
String[] fieldArr = field.split(",");
//获取导出字段名称
List<String> fieldNames = new ArrayList<String>();
//获取导出字段代码
List<String> fieldCodes = new ArrayList<String>();
for (int i = 0; i < fieldArr.length; i++) {
String names = fieldArr[i];
String[] nameArr = names.split("#");
fieldNames.add(nameArr[1]);
fieldCodes.add(nameArr[0]);
}
//开导出
ExcelExportUtil exportUtil = ExcelExportUtil.start(path, webpath,filePrefix, fieldNames,fieldCodes, flushRows);
//导数据
exportUtil.writeDatas(datas);
exportUtil.exportFile();
return exportUtil;
}
public static void main(String[] args) {
//使用方法，调用
//excelExport
}
//----get set-------------------------------------------------
public SXSSFWorkbook getWorkbook() {
return workbook;
}
public void setWorkbook(SXSSFWorkbook workbook) {
this.workbook = workbook;
}
public Sheet getSheet() {
return sheet;
}
public void setSheet(Sheet sheet) {
this.sheet = sheet;
}
public int getFlushRows() {
return flushRows;
}
public void setFlushRows(int flushRows) {
this.flushRows = flushRows;
}
public int getRowNum() {
return rowNum;
}
public void setRowNum(int rowNum) {
this.rowNum = rowNum;
}
public int getColNum() {
return colNum;
}
public void setColNum(int colNum) {
this.colNum = colNum;
}
public String getFilePath() {
return filePath;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
public String getFileWebPath() {
return fileWebPath;
}
public void setFileWebPath(String fileWebPath) {
this.fileWebPath = fileWebPath;
}
public String getFilePrefix() {
return filePrefix;
}
public void setFilePrefix(String filePrefix) {
this.filePrefix = filePrefix;
}
public String getFileAllPath() {
return fileAllPath;
}
public void setFileAllPath(String fileAllPath) {
this.fileAllPath = fileAllPath;
}
public List<String> getFieldNames() {
return fieldNames;
}
public void setFieldNames(List<String> fieldNames) {
this.fieldNames = fieldNames;
}
public List<String> getFieldCodes() {
return fieldCodes;
}
public void setFieldCodes(List<String> fieldCodes) {
this.fieldCodes = fieldCodes;
}
}
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