java后台樹形結構展示---懶加載

一、數據庫設計

 

 

 二、實體類：entity

import com.joyoung.cloud.security.common.validatedGroup.Add;
import com.joyoung.cloud.security.common.validatedGroup.Modify;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.experimental.Accessors;

import javax.persistence.Id;
import javax.persistence.Transient;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Null;
import javax.validation.constraints.Pattern;
import java.io.Serializable;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

/**
 * 公司表(SysCompany)實體類
 *
 * @author yangyuwei
 * @since 2019-06-06 13:45:23
 */
@ApiModel(value = "公司類")
@Data
@Accessors(chain = true)
public class SysCompany implements Serializable {
 private static final long serialVersionUID = 600959061181555399L;
 @ApiModelProperty(value = "主鍵Id")
 @Id
 @Null(message = "{add_id}", groups = {Add.class})
 @NotNull(message = "{modify_id}", groups = {Modify.class})
 private String id;
 //上級公司id
 @ApiModelProperty(value = "父Id")
 private String parentId;
 //公司名稱
 @ApiModelProperty(value = "公司名稱")
 @NotBlank(message = "{name_null}")
 @Pattern(regexp = "^[\\s\\S]{1,20}$", message = "{name_rule}")
 private String coName;
 //公司簡稱
 @ApiModelProperty(value = "公司簡稱")
 private String coAbbr;
 //公司編號
 @ApiModelProperty(value = "公司編號")
 private String coCode;
 //公司地址
 @ApiModelProperty(value = "公司地址")
 private String coAddr;
 //郵編
 @ApiModelProperty(value = "郵編")
 @Pattern(regexp = "^$|[0-9]{6}$", message = "{zipCode_error}")
 private String zipCode;
 //法人名稱
 @ApiModelProperty(value = "法人名稱")
 private String legalName;
 //法定代表人
 @ApiModelProperty(value = "法定代表人")
 private String legalRep;
 //稅號
 @ApiModelProperty(value = "稅號")
 private String taxId;
 //電話號碼("XXX-XXXXXXX"、"XXXX-XXXXXXXX"、"XXX-XXXXXXX"、"XXX-XXXXXXXX"、"XXXXXXX"和"XXXXXXXX)
// @Pattern(regexp = "^(\\(\\d{3,4}\\)|\\d{3,4}-|\\s)?\\d{7,14}$", message = "請輸入正確的電話號碼")
 @ApiModelProperty(value = "電話號碼")
 private String tel;
 //開戶銀行名稱
 @ApiModelProperty(value ="開戶銀行名稱")
 private String bankName;
 //開戶銀行賬號
 @ApiModelProperty(value = "開戶銀行賬號")
 private String bankAcct;
 //創建人id
 private String crtUser;
 //創建人名稱
 private String crtName;
 //創建時間
 private Date crtTime;
 //最后修改人id
 private String updUser;
 //最后修改人名稱
 private String updName;
 //最后修改時間
 private Date updTime;
 //備注
 private String remark;
 //邏輯刪除標識：1=刪除；0=未刪除
 private Integer delFlag;

 private String attr1;

 private String attr2;

 private String attr3;

 /*****************************以下為添加字段*********************************/
 @Transient
 private Boolean hasChecked;
 @Transient
 private Boolean hasChildren;
 @Transient
 private List<SysCompany> children = new LinkedList<SysCompany>();

}

三、controller

@ApiOperation(value = "懶加載查詢列表")
@GetMapping("/children")
public List<SysCompany> getChildren(SysCompany sysCompany) {
 return service.getChildren(sysCompany);
}

四、service

@Override
public List<SysCompany> getChildren(SysCompany sysCompany) {
 List<SysCompany> companyList = dao.selectCompanyInfo(sysCompany);
 if (StringUtils.isNotBlank(sysCompany.getCoName())) {
 return getTree(sysCompany);
 }
 return companyList;
}

/**
這里一般將此方法放在entity里面
*/

private List<SysCompany> getTree(SysCompany sysCompany) {
    Map<String, SysCompany> map = dao.selectByCompany(sysCompany);
 List<SysCompany> tree = new ArrayList<>();
 map.forEach((id, obj) -> {
 if (map.containsKey(obj.getParentId())) {
 map.get(obj.getParentId()).getChildren().add(obj);
 } else {
 tree.add(obj);
 }
 });
 return tree;
}

五、dao

public List<SysCompany> selectCompanyInfo(SysCompany sysCompany);

六、mapper

<sql id="sys_param">
 c.id,
 c.parent_id,
 c.co_name,
 c.co_abbr,
 c.co_code,
 c.co_addr,
 c.zip_code,
 c.legal_name,
 c.legal_rep,
 c.tax_id,
 c.tel,
 c.bank_name,
 c.bank_acct,
 c.crt_user,
 c.crt_name,
 c.crt_time,
 c.upd_user,
 c.upd_name,
 c.upd_time,
 c.remark,
 c.del_flag
</sql>
<select id="selectCompanyInfo" resultMap="SysCompanyMap"
 parameterType="com.joyoung.cloud.security.common.entity.admin.SysCompany">
 SELECT
 <include refid="sys_param"/>,EXISTS (SELECT 1 from sys_company sc where sc.parent_id=c.id and sc.del_flag=0) as
 hasChildren
 FROM
 sys_company c
 WHERE
 c.del_flag = 0
 <if test="coName!=null">
 and c.co_name like concat ('%',#{coName},'%')
 </if>
 <if test="parentId !=null and parentId !=''">
 and c.parent_id = #{parentId}
 </if>
 <if test="parentId == null || parentId == ''">
 and c.parent_id is null
 </if>
</select>