对excel进行封装

package com.huawei.utils;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;

import com.cdsxt.dao.UsersDAO;

public class ExcelUtil {

/**
* 我们传入数据生成的excel的title 列的名字然后得到workbook
* @param title 生成的excel的名字
* @param headers 列的显示名称 header和include要一对一
* @param include 显示的列
* @param data 传入的数据
*
* @return wb 生成的WorkBook
*/
public static <T> Workbook export(String title,Map<String,String> params,List<T> data){
//生成workbook
Workbook wb = new HSSFWorkbook();

Sheet sheet = wb.createSheet("Sheet 1");

//构建title
Row title_row = sheet.createRow(0);
Cell title_cell = title_row.createCell(0);
//设置值
title_cell.setCellValue(title);
//设置样式
CellStyle title_style = wb.createCellStyle();
title_style.setAlignment(CellStyle.ALIGN_CENTER);
title_style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
title_cell.setCellStyle(title_style);
sheet.addMergedRegion(new CellRangeAddress(0,0,0,params.size()-1));
//设置行高
title_row.setHeight((short)(20*20));

//构建表头
Row header_row = sheet.createRow(1);

int ii = 0;

for(String key:params.keySet()){
sheet.setColumnWidth(ii, 256*24);
Cell header_cell = header_row.createCell(ii);
//设置值
header_cell.setCellValue(params.get(key));
//设置样式
header_cell.setCellStyle(title_style);
ii++;
}

//得到一个样本主要用于反射结构信息
//T d = data.get(0);
//Class<?> clazz = d.getClass();

Class<?> clazz = data.get(0).getClass();

//得到列（Field）
//Field []fields = clazz.getDeclaredFields();

try{
for(int i=0;i<data.size();i++){
//表示一行
Row row = sheet.createRow(i+2);
T temp = data.get(i);
//遍历属性（列）
int j=0;
for(String key :params.keySet()){
//创建一个单元格
Cell cell = row.createCell(j);
Method method = clazz.getDeclaredMethod(BeanUtil.getter(key));
Object value = method.invoke(temp);

if(value==null){
cell.setCellValue("");
}else{
if(value instanceof Date){
//如果是日期类型需要强转而且需要设置格式
cell.setCellValue((Date)value);
//创建一个style
CellStyle style = wb.createCellStyle();
//创建一个数据格式化器
style.setDataFormat(wb.getCreationHelper().createDataFormat().getFormat("yyyy年MM月dd日 hh:mm:ss"));
cell.setCellStyle(style);
}else if(value instanceof Number){ //判断是否为数字
cell.setCellValue(Double.parseDouble(value+""));
}else if(value instanceof String){
if(Pattern.matches("^\\d+(\\.\\d+)?$", value+"")){ //判断是否为纯数字的字符串
cell.setCellValue(Double.parseDouble(value+""));
}else{
cell.setCellValue(value+"");
}
}
}
j++;
}
}
}catch (Exception e) {
e.printStackTrace();
}

return wb;
}

public static <T> Workbook export(String title,String []headers,String []include,List<T> data){
//生成workbook
Workbook wb = new HSSFWorkbook();

Sheet sheet = wb.createSheet("Sheet 1");

//构建title
Row title_row = sheet.createRow(0);
Cell title_cell = title_row.createCell(0);
//设置值
title_cell.setCellValue(title);
//设置样式
CellStyle title_style = wb.createCellStyle();
title_style.setAlignment(CellStyle.ALIGN_CENTER);
title_style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
title_cell.setCellStyle(title_style);
sheet.addMergedRegion(new CellRangeAddress(0,0,0,headers.length-1));
//设置行高
title_row.setHeight((short)(20*20));

//构建表头
Row header_row = sheet.createRow(1);
for(int i=0;i<headers.length;i++){
sheet.setColumnWidth(i, 256*24);
Cell header_cell = header_row.createCell(i);
//设置值
header_cell.setCellValue(headers[i]);
//设置样式
header_cell.setCellStyle(title_style);
}

//得到一个样本主要用于反射结构信息
//T d = data.get(0);
//Class<?> clazz = d.getClass();

Class<?> clazz = data.get(0).getClass();

//得到列（Field）
//Field []fields = clazz.getDeclaredFields();

try{
for(int i=0;i<data.size();i++){
//表示一行
Row row = sheet.createRow(i+2);
T temp = data.get(i);
//遍历属性（列）
for(int j=0;j<include.length;j++){
//创建一个单元格
Cell cell = row.createCell(j);
Method method = clazz.getDeclaredMethod(BeanUtil.getter(include[j]));
Object value = method.invoke(temp);

return wb;
}

/**
* 我们传入数据生成的excel的title 列的名字然后得到workbook
* @param title 生成的excel的名字
* @param headers 列的显示名称
* @param data 传入的数据
*
* @return wb 生成的WorkBook
*/

public static <T> Workbook export(String title,String []headers,List<T> data){
//生成workbook
Workbook wb = new HSSFWorkbook();

Sheet sheet = wb.createSheet("Sheet 1");

//构建title
Row title_row = sheet.createRow(0);
Cell title_cell = title_row.createCell(0);
//设置值
title_cell.setCellValue(title);
//设置样式
CellStyle title_style = wb.createCellStyle();
title_style.setAlignment(CellStyle.ALIGN_CENTER);
title_style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
title_cell.setCellStyle(title_style);
sheet.addMergedRegion(new CellRangeAddress(0,0,0,headers.length-1));
//设置行高
title_row.setHeight((short)(20*20));

//得到一个样本主要用于反射结构信息
//T d = data.get(0);
//Class<?> clazz = d.getClass();

Class<?> clazz = data.get(0).getClass();

//得到列（Field）
Field []fields = clazz.getDeclaredFields();

try{
for(int i=0;i<data.size();i++){
//表示一行
Row row = sheet.createRow(i+2);
T temp = data.get(i);
//遍历属性（列）
for(int j=0;j<fields.length;j++){
//创建一个单元格
Cell cell = row.createCell(j);
Method method = clazz.getDeclaredMethod(BeanUtil.getter(fields[j]));

Object value = method.invoke(temp);

return wb;
}

public static void main(String[] args) {
UsersDAO dao = new UsersDAO();

Workbook wb = export("用户信息", new String[]{"ID","用户名","年龄","邮箱"},new String[]{"id","username","age","email"}, dao.findAll());

try {
FileOutputStream out = new FileOutputStream("F:/text-export.xls");
wb.write(out);
out.flush();
out.close();
wb.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

package com.huawei.utils;

import java.lang.reflect.Field;

/**
* bean 工具
* @author Administrator
*
*/
public class BeanUtil {

/**
* 获取set方法名
* 获取标名
* @param clazz
*/
public static String getTableName(Class<?> clazz){
//获取类名
String name = clazz.getSimpleName();
name = name.substring(0, 1).toLowerCase()+name.substring(1);
return name;
}

/**
* @param field
* @return
*/
public static String setter(Field field){
String name = field.getName();
return "set"+name.substring(0,1).toUpperCase()+name.substring(1);
}
public static String getter(Field field){
return getter(field.getName());
}
public static String getter(String name){
return "get"+name.substring(0,1).toUpperCase()+name.substring(1);
}

public static String getColumnName(Field field){
String name = field.getName();
return name.substring(0,1).toLowerCase()+name.substring(1);
}
}

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对excel进行封装

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