工具方法：java导出Excel表格(简单示例)

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

public class ExcelUtil<T> {
//exportExcel.java     Myview.java 879行
public void exportExcel(String title, String[] headers, Collection<T> dataset, OutputStream out, String pattern) {
// 声明一个工作薄
SXSSFWorkbook workbook = new SXSSFWorkbook(1000);
// 生成一个表格
SXSSFSheet sheet = (SXSSFSheet) workbook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 15);
// 产生表格标题行
SXSSFRow row = (SXSSFRow) sheet.createRow(0);
for (short i = 0; i < headers.length; i++) {
SXSSFCell cell = (SXSSFCell) row.createCell(i);
cell.setCellValue(headers[i]);
}
// 遍历集合数据，产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
row = (SXSSFRow) sheet.createRow(index);
T t = (T) it.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < fields.length; i++) {
SXSSFCell cell = (SXSSFCell) row.createCell(i);
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get"+ fieldName.substring(0, 1).toUpperCase()+ fieldName.substring(1);
try {
Class<? extends Object> tclass = t.getClass();
Method getMethod = tclass.getMethod(getMethodName,new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
row.setHeightInPoints(20);
} else {
// 其它数据类型都当作字符串简单处理
textValue = value!=null?value.toString():"";
row.setHeightInPoints(20);
}
// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
cell.setCellValue(textValue);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 清理资源
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}
}
}

public class UserVO {
private String name;
private int grade;
private int age;
private String address;
private String phone;

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.taray.pojo.UserVO;
import com.taray.util.ExcelUtil;

@Controller
@Scope("prototype")
public class ExportExcelController {
@RequestMapping("export")
public void exportInof(HttpServletRequest request,HttpServletResponse response) throws Exception{
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment; filename=EXCELNAME.xls");
OutputStream out = response.getOutputStream();
ExcelUtil<UserVO> t=new ExcelUtil<UserVO>();
String [] headers={"姓名","年级","年龄","地址","电话"};
//数据集合开始
List<UserVO> list=new ArrayList<UserVO>();
UserVO u1=new UserVO();
u1.setName("张三");
u1.setGrade(3);
u1.setAge(12);
u1.setAddress("湖中");
u1.setPhone("123321321");
UserVO u2=new UserVO();
u2.setName("李四");
u2.setGrade(2);
u2.setAge(16);
u2.setAddress("湖北");
u2.setPhone("54324231");
UserVO u3=new UserVO();
u3.setName("王五");
u3.setGrade(4);
u3.setAge(13);
u3.setAddress("湖南");
u3.setPhone("125435342");
list.add(u1);
list.add(u2);
list.add(u3);
//数据集合结束
t.exportExcel("文件名词", headers, list, out, "yyyy-MM-dd HH:mm:ss");
out.close();
}
}