java利用EasyPoi实现Excel导出功能

easypoi功能如同名字easy,主打的功能就是容易,让一个没见接触过poi的人员 就可以方便的写出Excel导出,Excel模板导出,Excel导入,Word模板导出,通过简单的注解和模板 语言(熟悉的表达式语法),完成以前复杂的写法。

具体实现步骤：

1、Maven中添加依赖

        <!--easypoi导出excel-->
        <!--easypoi-base 导入导出的工具包,可以完成Excel导出,导入,Word的导出,Excel的导出功能-->
        <dependency>
            <groupId>org.jeecg</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>${easypoi-base.version}</version>
        </dependency>
        <!--easypoi-web  耦合了spring-mvc 基于AbstractView,极大的简化spring-mvc下的导出功能-->
        <dependency>
            <groupId>org.jeecg</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>${easypoi-web.version}</version>
        </dependency>
        <!--easypoi-annotation 基础注解包,作用与实体对象上,拆分后方便maven多工程的依赖管理-->
        <dependency>
            <groupId>org.jeecg</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>${easypoi-annotation.version}</version>
        </dependency>

2、POJO中添加注解

/**
 * <p>
 * 管理员表
 * </p>
 * 
 * @Excel所含的参数：
 *  name：导入导出字段名称，比如: name = "学生姓名" 
 *  replace ：替换值，比如：replace = {"男_1","女_2"}
 *  width ：宽度，比如：width = 30，默认10
 *  height ：高度(一个设置全局生效), height = 20  ，默认10
 *  orderNum ：排序，默认0
 *  format ：时间格式化
 *  type ：导出字段类型导出类型 1 是文本 2 是图片,3是函数默认是文本，默认1
 *  imageType ：图片类型, 导出类型 1 从file读取 2 是从数据库中读取，默认1
 *  savePath ：图片保存路径，默认upload 
 * 
 */
@ExcelTarget("user")
public class User extends Model<User> {

    private static final long serialVersionUID = 1L;

    /**
     * 主键id
     */
    @TableId(value="id", type= IdType.AUTO)
    private Integer id;
    /**
     * 头像
     */
    private String avatar;
    /**
     * 账号
     */
    @Excel(name = "账号", orderNum = "1", mergeVertical = true, isImportField = "account")
    private String account;
    /**
     * 密码
     */
    private String password;
    /**
     * md5密码盐
     */
    private String salt;
    /**
     * 名字
     */
    @Excel(name = "姓名", orderNum = "2", mergeVertical = true, isImportField = "name")
    private String name;
    /**
     * 生日
     */
    private Date birthday;
    /**
     * 性别（1：男 2：女）
     */
    private Integer sex;
    /**
     * 电子邮件
     */
    @Excel(name = "邮箱", orderNum = "6", mergeVertical = true, isImportField = "email", width = 30)
    private String email;
    /**
     * 电话
     */
    @Excel(name = "电话", orderNum = "7", mergeVertical = true, isImportField = "phone",width = 30)
    private String phone;
    /**
     * 角色id
     */
    private String roleid;
    /**
     * 部门id
     */
    private Integer deptid;
    /**
     * 状态(1：启用  2：冻结  3：删除）
     */
    private Integer status;
    /**
     * 创建时间
     */
    @Excel(name = "创建时间", orderNum = "8", mergeVertical = true, isImportField = "createtime" ,format="yyyy-MM-dd hh:mm:ss",width = 30)
    private Date createtime;
    /**
     * 保留字段
     */
    private Integer version;
    
    
    /**
     * 用于EXCEL导出的相关字段，与Warpper中翻译字段对应
     * transient：去序列化，防止将这些字段加入到sql语句中导致sql报错
     */
    @Excel(name = "性别", orderNum = "3", mergeVertical = true, isImportField = "sexName")
    private transient String sexName;
    
    @Excel(name = "角色", orderNum = "4", mergeVertical = true, isImportField = "roleName" , width = 20)
    private transient String roleName;
    
    @Excel(name = "部门", orderNum = "5", mergeVertical = true, isImportField = "deptName")
    private transient String deptName;
    
    @Excel(name = "状态", orderNum = "9", mergeVertical = true, isImportField = "statusName")
    private transient String statusName;


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getAvatar() {
        return avatar;
    }

    public void setAvatar(String avatar) {
        this.avatar = avatar;
    }

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getSalt() {
        return salt;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getRoleid() {
        return roleid;
    }

    public void setRoleid(String roleid) {
        this.roleid = roleid;
    }

    public Integer getDeptid() {
        return deptid;
    }

    public void setDeptid(Integer deptid) {
        this.deptid = deptid;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    public Integer getVersion() {
        return version;
    }

    public void setVersion(Integer version) {
        this.version = version;
    }

    @Override
    protected Serializable pkVal() {
        return this.id;
    }

    public String getSexName() {
        return sexName;
    }

    public void setSexName(String sexName) {
        this.sexName = sexName;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }

    public String getStatusName() {
        return statusName;
    }

    public void setStatusName(String statusName) {
        this.statusName = statusName;
    }
    
}

3、Controller中请求

  // 下载execl文档
  @RequestMapping("/downloadExcel")
  public void download(HttpServletRequest request, HttpServletResponse response) throws Exception {
    // 告诉浏览器用什么软件可以打开此文件
    response.setHeader("content-Type", "application/vnd.ms-excel");
    // 下载文件的默认名称
    response.setHeader("Content-Disposition", "attachment;filename=" + new String("用户数据表".getBytes("gbk"), "iso8859-1")+".xls"); 
    //编码
    response.setCharacterEncoding("UTF-8");
    List<User> list = userService.findAll();
    Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), User.class, list);
    workbook.write(response.getOutputStream());
  }

4、前端页面添加Button

<input type="button" value="导出为Excel" onclick="window.open('/downloadExcel');"/>

导出功能实现！