使用poi匯出excel根據指定列自動合併行

一、效果圖

二、js**

function assemble_dg_columns() );

arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
arr.push();
return arr;
}$("body").on("click", "#btn_print", function () );
function assessevaluationsummaryprint() 
}window.location.href= "jee/vassessevaluationsummaryc/exportexecl?key_columns="+key_columns+"&value_columns="+value_columns;
}

（1）controller

@controller

public class vassessevaluationsummarycontroller extends baseentitycontroller

@resource

private vassessevaluationsummaryservice vassessevaluationsummaryservice;

@responsebody

@systemcontrollerlog(description="考核評價彙總--匯出功能")

注：excel檔案中文名亂碼使用"+new string("考核評價".getbytes("gb2312"),"iso8859-1")+".xlsx"解決

（2）service

@service("vassessevaluationsummaryservice")

public class vassessevaluationsummaryserviceimpl implements vassessevaluationsummaryservice 
listls_param = new arraylist();
string hql = "select u from vassessevaluation u where (del_flag is null or del_flag != '1')";
string hqlcount = "select count(u) from vassessevaluation u where (del_flag is null or del_flag != '1')";
if(stringutils.isnotblank(key)) 
if(stringutils.isnotblank(start_time)) 
if(stringutils.isnotblank(end_time)) 
if(stringutils.isnotblank(question_type)) 
if(stringutils.isnotblank(id_postduty)) 
if(stringutils.isnotblank(sort)&&stringutils.isnotblank(order)) 
list = baseinfoservice.listquerybyhql(hql,ls_param,rows,page);
object total = baseinfoservice.getobjectbyhql(hqlcount,ls_param);
pageresult result = new pageresult();
if (list != null)  else 
}		return result;	}	
/*** 
* @description 考核評價彙總--匯出功能 
* @param key_columns
* @param value_columns
* @return hssfworkbook
* @throws exception 
*	 */
@override
public hssfworkbook exportexecl(string key_columns, string value_columns) throws exception else 
}else 
}list1.add(list2);
}		int arr = ; //要合併的列，從0開始
int judge = 10; //判斷字段，沒有則為-1
return exportutil.exportautocell("考核評價彙總",key_columns,value_columns,list1,arr,judge);	}	
}

public class exportutil 

//把資料新增到excel
for (int i = 0; i < list.size(); i++) 
}//自動合併
for (int k = 0; k < field_arr.length; k++) 
if(list.get(i).get(field).equals(list.get(i-1).get(field)))
}int rowspan = 2;
d = rowspan;
for (int j = 2; i-j >= 0; j++) else
}rowspan = j+1;
d = rowspan;}}
sheet.addmergedregion(new cellrangeaddress(i-rowspan+2, i+1, field, field)); 
}else }}
return workbook;
}/**
* * @author zhangshizhe
* @date 2023年6月15日 下午1:53:52
* @description 利用反射獲取get方法 
* @fcunction getfiled
* @param object
* @param field
* @return string**/
public static string getfiled(object object, string field) 
return invoke.tostring();
}} catch (exception e) 
return "";}}

import org.apache.poi.ss.util.cellrangeaddress;

sheet.addmergedregion(new cellrangeaddress(0, 1, 0, 1));

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