Java使用Apache.POI中HSSFWorkbook导出到Excel的实现方法

使用apache.poi中hssfworkbook导出到excel，具体内容如下所示：

1.引入poi依赖（3.12）

依赖如下：

<dependency>
   <groupid>org.apache.poi</groupid>
   <artifactid>poi</artifactid>
   <version>3.12</version>
</dependency>

2.创建实体类（user.java）

package com.kd.nm.entity.pojo;

/**
 * 实体类（user）
 *
 * author 小辰哥哥
 */
public class user {
 // 用户编号
 private string userno;
 // 用户名称
 private string username;
 // 年龄
 private string age;

 // 无参构造
 public user() {
 }

 // 有参构造
 public user(string userno, string username, string age) {
  this.userno = userno;
  this.username = username;
  this.age = age;
 }

 // get与set方法进行封装
 public string getuserno() {
  return userno;
 }

 public void setuserno(string userno) {
  this.userno = userno;
 }

 public string getusername() {
  return username;
 }

 public void setusername(string username) {
  this.username = username;
 }

 public string getage() {
  return age;
 }

 public void setage(string age) {
  this.age = age;
 }

 // 重新tostring方法
 @override
 public string tostring() {
  return "user{" +
    "userno='" + userno + '\'' +
    ", username='" + username + '\'' +
    ", age='" + age + '\'' +
    '}';
 }
}

3.excel相关工具类（excelutil、reflectutil）

package com.kd.nm.util;

import java.util.arraylist;
import java.util.list;
import java.util.map;
import org.apache.poi.hssf.usermodel.*;

/**
 * description : excel相关工具类
 *
 * @author: 小辰哥哥
 *
 */
public class excelutil {

 /**
  * 生成excel表格
  * @param heads 表头内容
  * @param data 数据内容
  * @return
  */
 public static hssfworkbook createxcel(map<string, string> heads, list data) {

  // 声明一个工作薄
  hssfworkbook workbook = new hssfworkbook();
  // 生成一个表格
  hssfsheet sheet = workbook.createsheet();

  // 生成标题行样式
  hssfcellstyle headstyle = creatstyle(workbook, (short) 14);

  // 生成表格内容样式
  hssfcellstyle bodystyle = creatstyle(workbook, (short) 10);

  // 标题元素
  list<string> keys = new arraylist<string>(heads.keyset());

  // 像素单位
  short px = 1000;
  // 设置列宽
  for (int columnindex = 0; columnindex < keys.size(); columnindex++) {

   sheet.setcolumnwidth(columnindex, 6 * px);
  }

  // 生成表格
  for (int rownum = 0; rownum <= data.size(); rownum++) {

   // 创建行
   hssfrow row = sheet.createrow(rownum);

   for (int cellnum = 0; cellnum < keys.size(); cellnum++) {

    // 创建列
    hssfcell cell = row.createcell(cellnum);

    // 标题
    if (rownum == 0) {

     cell.setcellstyle(headstyle);
     cell.setcellvalue(heads.get(keys.get(cellnum)));
    } else { // 内容

     cell.setcellstyle(bodystyle);
     // 通过反射获取
     cell.setcellvalue(reflectutil.getvalue(keys.get(cellnum), data.get(rownum - 1)));
    }
   }
  }

  return workbook;
 }

 /**
  * 生成样式
  * @param workbook
  * @param size
  * @return
  */
 public static hssfcellstyle creatstyle(hssfworkbook workbook, short size) {

  hssfcellstyle style = workbook.createcellstyle();
  style.setalignment((hssfcellstyle.align_center));
  style.setverticalalignment((hssfcellstyle.vertical_center));
  hssffont font = workbook.createfont();
  font.setfontheightinpoints(size);
  font.setfontname("微软雅黑");
  style.setfont(font);
  style.setborderbottom(hssfcellstyle.border_thin);
  style.setbordertop(hssfcellstyle.border_thin);
  style.setborderright(hssfcellstyle.border_thin);
  style.setborderleft(hssfcellstyle.border_thin);

  return style;
 }
}

package com.kd.nm.util;

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.util.reflectionutils;
import java.beans.propertydescriptor;
import java.lang.reflect.method;

/**
 * 反射工具包
 *
 * @author: 小辰哥哥
 */
public class reflectutil {

 private static final logger logger = loggerfactory.getlogger(reflectutil.class);

 public static string getvalue(string key, object obj) {

  string value = "";

  try {

   // 获取当前属性
   propertydescriptor pd = new propertydescriptor(key, obj.getclass());
   // 获取get方法
   method getmd = pd.getreadmethod();
   value = getmd.invoke(obj).tostring();
  } catch (exception e) {

   logger.error("获取内容失败！");
   e.printstacktrace();
  }

  return value;
 }

 public static void setvalue(string key, string value, object obj) {

  try {

   // 获取当前属性
   propertydescriptor pd = new propertydescriptor(key, obj.getclass());
   // 获取set方法
   method writemd = pd.getwritemethod();
   writemd.invoke(obj, value);
  } catch (exception e) {

   logger.error("设置内容失败！");
   e.printstacktrace();
  }
 }
}

4.后端控制器代码

@requestmapping(value = "/exportexcel",method = requestmethod.get,produces = "application/json")
 public void exportexcel(httpservletresponse httpservletresponse) throws ioexception {

  // 表头内容（可在前端设置，通过参数传递进来） key是实体类的属性值，value是表头的lable
  map<string,string> head = new hashmap<>();
  head.put("userno","用户编号");
  head.put("username","用户名称");
  head.put("age","年龄");

  // 表格数据内容,模拟数据库查询出来的数据
  list<user> data = new arraylist<>();
  data.add(new user("1","小辰哥哥","18"));
  data.add(new user("2","小猪妹妹","18"));
  data.add(new user("3","大猪哥哥","18"));
  
  
  // 生成工作薄
  hssfworkbook hssfworkbook = excelutil.createxcel(head, data);

  // 定义文件名
  string filename = "导出excel表格";

  httpservletresponse.setheader("cache-control", "max-age=0");
  httpservletresponse.setcontenttype("application/vnd.ms-excel");
  httpservletresponse.addheader("content-disposition", "attachment;filename=" + new string(filename.getbytes("gb2312"),
    "iso-8859-1") + ".xls");

  outputstream outputstream = httpservletresponse.getoutputstream();

  hssfworkbook.write(outputstream);
  outputstream.flush();
  outputstream.close();
 }

5.访问映射地址

接口访问：

http://localhost:9090/faulttreatment/api/standard/exportexcel

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