java获取excle表格对象_Java使用excel工具类导出对象功能示例
本文實(shí)例講述了Java使用excel工具類導(dǎo)出對(duì)象功能。分享給大家供大家參考，具體如下：
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、定義工作表
private SXSSFWorkbook workbook;
// 2、定義sheet
private Sheet sheet;
// 3、定義保存在內(nèi)存中的數(shù)量,-1表示手動(dòng)控制
private int flushRows;
/**
* 4、導(dǎo)出文件行數(shù)
*/
private int rowNum;
/**
* 5、導(dǎo)出文件列數(shù)
*/
private int colNum;
/**
* 6、導(dǎo)出文件的存放路徑
*/
private String filePath;
/**
* 7、下載導(dǎo)出文件的路徑
*/
private String fileWebPath;
/**
* 8、文件名稱前綴
*/
private String filePrefix;
/**
* 9、導(dǎo)出文件全路徑
*/
private String fileAllPath;
/**
* 10、導(dǎo)出文件列標(biāo)題
*/
private List fieldNames;
/**
* 11、導(dǎo)出文件每列代碼，用于反射獲取對(duì)象屬性值
*/
private List fieldCodes;
//---構(gòu)造方法-----------------------------------------
public ExcelExportUtil() {
}
public ExcelExportUtil(SXSSFWorkbook workbook) {
this.workbook = workbook;
}
public static ExcelExportUtil start(String filePath, String fileWebPath, String filePrefix, List fieldNames, List fieldCodes, int flushRows) throws Exception {
ExcelExportUtil excelExportUtil = new ExcelExportUtil();
excelExportUtil.setFilePath(filePath);
excelExportUtil.setFileWebPath(fileWebPath);
excelExportUtil.setFilePrefix(filePrefix);
excelExportUtil.setFieldNames(fieldNames);
excelExportUtil.setFieldCodes(fieldCodes);
//設(shè)置輸出行數(shù)
excelExportUtil.setWorkbook(new SXSSFWorkbook(flushRows));
//設(shè)置sheet
excelExportUtil.setSheet(excelExportUtil.getWorkbook().createSheet());
excelExportUtil.writeTitles();
return excelExportUtil;
}
/**
* 創(chuàng)建標(biāo)題
*
* @throws Exception
*/
public void writeTitles() throws Exception {
rowNum = 0;
colNum = fieldNames.size();
//創(chuàng)建行
Row row = sheet.createRow(rowNum);
//在每列第一行輸出標(biāo)題
for (int i = 0; i < colNum; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(fieldNames.get(i));
}
}
/**
* 寫入對(duì)象數(shù)據(jù)
*
* @param datalist
* @throws Exception
*/
public void writeDatas(List datalist) throws Exception {
for (int i = 0; i < datalist.size(); i++) {
rowNum++;
//不斷創(chuàng)建行
Row row = sheet.createRow(rowNum);
for (int j = 0; j < fieldCodes.size(); j++) {
Object obj = datalist.get(j);
//獲得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() : "");
}
}
}
/**
* 獲得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
argsClass[i] = args[i].getClass();
}
Method method = ownerClass.getMethod(methodName, argsClass);
return method.invoke(owner, args);
}
/**
* 向?qū)С鑫募憯?shù)據(jù)
*
* @param datalist 存放字符串?dāng)?shù)組
* @return
*/
public void writeDatasByStr(List 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) : "");
}
}
/**
* 手動(dòng)刷新方法,如果flushRows為-1則需要使用此方法手動(dòng)刷新內(nèi)存
* @param flushNum
* @throws Exception
*/
public void flush(int flushNum) throws Exception{
((SXSSFSheet)sheet).flushRows(flushNum);
}
/**
* 導(dǎo)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;
}
/**
* 導(dǎo)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{
//導(dǎo)出字段代碼和名稱
String[] fieldArr = field.split(",");
//獲取導(dǎo)出字段名稱
List fieldNames = new ArrayList();
//獲取導(dǎo)出字段代碼
List fieldCodes = new ArrayList();
for (int i = 0; i < fieldArr.length; i++) {
String names = fieldArr[i];
String[] nameArr = names.split("#");
fieldNames.add(nameArr[1]);
fieldCodes.add(nameArr[0]);
}
//開導(dǎo)出
ExcelExportUtil exportUtil = ExcelExportUtil.start(path, webpath,filePrefix, fieldNames,fieldCodes, flushRows);
//導(dǎo)數(shù)據(jù)
exportUtil.writeDatas(datas);
exportUtil.exportFile();
return exportUtil;
}
public static void main(String[] args) {
//使用方法，調(diào)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 getFieldNames() {
return fieldNames;
}
public void setFieldNames(List fieldNames) {
this.fieldNames = fieldNames;
}
public List getFieldCodes() {
return fieldCodes;
}
public void setFieldCodes(List fieldCodes) {
this.fieldCodes = fieldCodes;
}
}
希望本文所述對(duì)大家java程序設(shè)計(jì)有所幫助。
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