jfinal 导出excle

Controller

Map<String,List<PoiUtilHeader>> result = new HashMap<String, List<PoiUtilHeader>>();
                List<PoiUtilHeader> row0 = new ArrayList<PoiUtilHeader>();
                row0.add(new PoiUtilHeader(0,"id",1,false));
                row0.add(new PoiUtilHeader(0,"name",1,false));
                row0.add(new PoiUtilHeader(0,"age",1,false));
                row0.add(new PoiUtilHeader(0,"statue",1,false));
                        List<Record>  invList =Db.find("select * from user");
            String uuid=UuidUtil.get16UUId()+"RZJGDC.xls";
            String[] fields=new String[]{"id","name","age","statue"};
            render(PoiUtilRender.data(invList).headers(result).fileName(uuid).fields(fields));

PoiUtilHeader

package com.tax.common.util;


public class PoiUtilHeader{

    //表头等级
    private int level=0;
    //表头名称
    private String columnsName="";
    //所占列数
    private int cellCount=0;
    //是否有子节点
    private boolean isChildren=false;
    
    public PoiUtilHeader(int level,String columnsName,int cellCount,boolean isChildren){
        this.level=level;
        this.columnsName=columnsName;
        this.cellCount=cellCount;
        this.isChildren=isChildren;
    }
    public PoiUtilHeader(int level,String columnsName,int cellCount){
        this.level=level;
        this.columnsName=columnsName;
        this.cellCount=cellCount;
    }
    public PoiUtilHeader(int level,String columnsName,boolean isChildren){
        this.level=level;
        this.columnsName=columnsName;
        this.isChildren=isChildren;
    }
    public PoiUtilHeader(int level,String columnsName){
        this.level=level;
        this.columnsName=columnsName;
    }
    public int getLevel() {
        return level;
    }
    public void setLevel(int level) {
        this.level = level;
    }
    public String getColumnsName() {
        return columnsName;
    }
    public void setColumnsName(String columnsName) {
        this.columnsName = columnsName;
    }
    public int getCellCount() {
        return cellCount;
    }
    public void setCellCount(int cellCount) {
        this.cellCount = cellCount;
    }
    public boolean getIsChildren() {
        return isChildren;
    }
    public void setIsChildren(boolean isChildren) {
        this.isChildren = isChildren;
    }
    
    
}

service  数据处理

     List listexcel = new ArrayList();   
     if(!invlist.isEmpty()){
                for (int i = 0; i < invlist.size(); i++) {
                    Record mapDc = new Record();
                    Record record = (Record) invlist.get(i);
                    String statuea="";
                    if (record.get("statue").equals("0")) {
                        statuea="正常";
                    }else{
                        statuea="作废";
                    }
                    
                    mapDc.set("invtype", invtypea);
                    mapDc.set("period", record.get("id", ""));
                    mapDc.set("create_time", record.get("name", ""));
                                mapDc.set("create_time", record.get("age", ""));
                    listexcel.add(mapDc);
                }
            }

return listexcel;

PoiUtilRender

package com.tax.common.util;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import com.jfinal.plugin.activerecord.Model;
import com.jfinal.plugin.activerecord.Record;
import com.jfinal.render.Render;
import com.jfinal.render.RenderException;

/**
 * 导出2003的excel表格,超过65535行可能会报错
 * 多行跨行跨列表头算法
 * @author by:zy
 */
@SuppressWarnings("unchecked")
public class PoiUtilRender extends Render {

    public final static String H_MAP_NAME="tName";
    public final static String H_MAP_SUBNAME="tSubName";
    
    private final String CONTENT_TYPE = "application/msexcel;charset=" + getEncoding();
    /*private final String VERSION_2003 = "2003";
    private final int MAX_ROWS = 65535;*/
    private String fileName = "file1.xls";
    private String sheetName = "sheet";
    private Map<String,List<PoiUtilHeader>> headers = new HashMap<String,List<PoiUtilHeader>>();
    private String[] fields =null;
    private List<?> data =null;

    public PoiUtilRender(List<?> data){
        this.data=data;
    }
    @Override
    public void render() {
        response.reset();
        response.setHeader("Content-disposition", "attachment; filename=" + fileName);
        response.setContentType(CONTENT_TYPE);
        OutputStream os = null;
        try {
            os = response.getOutputStream();
            export().write(os);
        } catch (Exception e) {
            throw new RenderException(e);
        } finally {
            try {
                if (os != null) {
                    os.flush();
                    os.close();
                }
            } catch (IOException e) {
                //LOG.error(e.getMessage(), e);
            }

        }
    }
     
    /**
     * 核心方法
     */
    public Workbook export() {
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet(sheetName);
        sheet.setDefaultColumnWidth(12);
        Row row;
        Cell cell;
        //表头
        int headerRow =0;
        if (this.headers != null && !this.headers.isEmpty()) {
            
            headerRow = headers.size();
            HSSFCellStyle headerStyle = this.getColumnTopStyle(wb);//获取列头样式
            Set<String> occupyCell =new HashSet<String>();
            
            //总行数
            int maxCellCount=0;
            for (PoiUtilHeader p : headers.get("row0")) {
                maxCellCount+=p.getCellCount();
            }
            
            for (int i = 0, len = headers.size(); i < len; i++) {
                List<PoiUtilHeader> list = headers.get("row" + i);
                row = sheet.createRow(i);
                row.setHeightInPoints(30);//设置高度
                
                int index = 0;
                int lastIndex = list.size();
                for (int j = 0, jlen = maxCellCount; j < jlen; j++) {
                    //超出索引退出
                    if(index>=lastIndex){break;}
                    //是否已被占用
                    if(occupyCell.contains(i+"-"+j)){continue;}
                    
                    PoiUtilHeader h = list.get(index);
                    //计算跨行的起点
                    int lastRowNum=i;
                    //计算跨行跨列
                    int lastCellNum = j + h.getCellCount()-1;
                    
                    if(!h.getIsChildren()){lastRowNum=len-1;}
                    cell = row.createCell(j);
                    cell.setCellValue(h.getColumnsName());
                    cell.setCellStyle(headerStyle);  
                    
                    for(int r = i ; r<=lastRowNum ; r++){
                        for(int c = j ; c<=lastCellNum ; c++){
                            occupyCell.add(r+"-"+c);
                        }
                    }
                    sheet.addMergedRegion(new CellRangeAddress(i, lastRowNum, j, lastCellNum));
                    index++;
                }
            }
        }
        //sheet.setColumnWidth(j, h.getColumnsName().getBytes().length*2*1000); 
        
        //内容
        if(data!=null){
            for (int i = 0, len = data.size(); i < len; i++) {
                row = sheet.createRow(i + headerRow);
                row.setHeightInPoints(20);//设置高度
                Object obj = data.get(i);
                if (obj == null) {
                    continue;
                }
                if (obj instanceof Map) {
                    processAsMap(row, obj);
                } else if (obj instanceof Model) {
                    processAsModel(row, obj);
                } else if (obj instanceof Record) {
                    processAsRecord(row, obj);
                } else if(obj instanceof List){
                    processAsList(row,obj);
                }else{
                    throw new RuntimeException("Not support type[" + obj.getClass() + "]");
                }
            }
        }
        return wb;
    }
    
    /*  
     * 列头单元格样式 
     */      
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {  
          // 设置字体  
          HSSFFont font = workbook.createFont();  
          //设置字体大小  
          font.setFontHeightInPoints((short)10);  
          //字体加粗  
          //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);  
          //设置字体名字   
          font.setFontName("Microsoft YaHei");  
          //设置样式;   
          HSSFCellStyle style = workbook.createCellStyle();
          //在样式用应用设置的字体;    
          style.setFont(font);  
          //设置自动换行;   
          style.setWrapText(true);  
          //设置水平对齐的样式为居中对齐;    
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);  
          //设置垂直对齐的样式为居中对齐;   
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); 
          //设置背景颜色;   
          style.setFillForegroundColor(new HSSFColor.BLUE_GREY().getIndex());
          
          return style;  
            
    }  
    
    private void processAsMap(Row row, Object obj) {
        Cell cell;
        Map<String, Object> map = (Map<String, Object>) obj;
        if(fields!=null && fields.length>0){
            for(int columnIndex = 0 , len = fields.length ; columnIndex<len ; columnIndex++){
                String key = fields[columnIndex];
                cell = row.createCell(columnIndex);
                cell.setCellValue(map.get(key) == null ? "" : map.get(key) + "");
            }
        }else{
            int columnIndex = 0;
            for(String key : map.keySet()){
                cell = row.createCell(columnIndex);
                cell.setCellValue(map.get(key) == null ? "" : map.get(key) + "");
                columnIndex++;
            }
        }
    }
    private void processAsModel(Row row, Object obj) {
        Cell cell;
        Model<?> model = (Model<?>) obj;
        if(fields!=null && fields.length>0){
            for(int columnIndex = 0 , len = fields.length ; columnIndex<len ; columnIndex++){
                String key = fields[columnIndex];
                cell = row.createCell(columnIndex);
                cell.setCellValue(model.get(key) == null ? "" : model.get(key) + "");
            }
        }else{
            int columnIndex = 0;
            Object[] vals = model._getAttrValues();
            for(Object v : vals){
                cell = row.createCell(columnIndex);
                cell.setCellValue(v == null ? "" : v + "");
                columnIndex++;
            }
        }
    }
    
    
    private void processAsList(Row row, Object obj) {
        Cell cell;
        System.out.println("scb");
        List record = (List) obj;
        if(fields!=null && fields.length>0){
            for(int columnIndex = 0 , len = fields.length ; columnIndex<len ; columnIndex++){
                String key = fields[columnIndex];
                cell = row.createCell(columnIndex);
                cell.setCellValue(record.get(0) == null ? "" : record.get(0) + "");
            }
        }else{
            int columnIndex = 0;
            Record red=new Record();
            Object[] vals = red.getColumnValues();
            for(Object v : vals){
                cell = row.createCell(columnIndex);
                cell.setCellValue(v == null ? "" : v + "");
                columnIndex++;
            }
        }
    }
    
    private void processAsRecord(Row row, Object obj) {
        Cell cell;
        Record record = (Record) obj;
        if(fields!=null && fields.length>0){
            for(int columnIndex = 0 , len = fields.length ; columnIndex<len ; columnIndex++){
                String key = fields[columnIndex];
                cell = row.createCell(columnIndex);
                cell.setCellValue(record.get(key) == null ? "" : record.get(key) + "");
            }
        }else{
            int columnIndex = 0;
            Object[] vals = record.getColumnValues();
            for(Object v : vals){
                cell = row.createCell(columnIndex);
                cell.setCellValue(v == null ? "" : v + "");
                columnIndex++;
            }
        }
    }
    
    private int setHeader(int level , List<Map<String, Object>> titles){
        if(titles==null || titles.isEmpty()) return 1;
        int resultNum=0;
        List<PoiUtilHeader> h = (this.headers.get("row"+level)==null?new ArrayList<PoiUtilHeader>():this.headers.get("row"+level));
        for(Map<String,Object> t : titles){
            int subNum = 0;
            boolean isChildren=false;
            if(t.get(H_MAP_SUBNAME) instanceof List){
                isChildren=true;
                List<Map<String,Object>> subList = (List<Map<String,Object>>)t.get(H_MAP_SUBNAME) ;
                subNum += setHeader(level+1, subList);
            }
            subNum = (subNum>0?subNum:1);
            resultNum+=subNum;
            h.add(new PoiUtilHeader(level, t.get(H_MAP_NAME)+"",subNum,isChildren));
        }
        this.headers.put("row"+level,h);
        
        if(resultNum>titles.size()){
            return resultNum;
        }else{
            return titles.size();
        }
    }
    
    
    
    
    public static PoiUtilRender data(List<?> data) {
        return new PoiUtilRender(data);
    }
    /***
     * 复杂的复合表头
     * tName : 表头名称
     * tSubName : 下级表头 List 数据  
     * 
     * 常量:
     * public final String H_MAP_NAME="tName";
     * public final String H_MAP_SUBNAME="tSubName";
     */
    public PoiUtilRender headers(List<Map<String, Object>> titles) {
        this.headers.clear();
        if(titles!=null && !titles.isEmpty()){
            List<PoiUtilHeader> h = new ArrayList<PoiUtilHeader>();
            for(Map<String,Object> t : titles){
                int subNum = 0;
                boolean isChildren=false;
                if(t.get(H_MAP_SUBNAME) instanceof List){
                    isChildren=true;
                    List<Map<String,Object>> subList = (List<Map<String,Object>>)t.get(H_MAP_SUBNAME) ;
                    subNum += setHeader(1, subList);
                }
                subNum = (subNum>0?subNum:1);
                h.add(new PoiUtilHeader(0, t.get(H_MAP_NAME)+"",subNum,isChildren));
            }
            this.headers.put("row0",h);
        }
        return this;
    }
    
    /**
     * 设置普通单行表头
     */
    public PoiUtilRender headers(String[] titles) {
        this.headers.clear();
        List<PoiUtilHeader> h = new ArrayList<PoiUtilHeader>();
        for(String t :titles){
            h.add(new PoiUtilHeader(0, t, 1, false));
        }
        this.headers.put("row0",h);
        return this;
    }
    /**
     * 设置复杂表头
     */
    public PoiUtilRender headers(Map<String,List<PoiUtilHeader>> titles) {
        this.headers.clear();
        this.headers=titles;
        return this;
    }
    /**
     * 设置文件名称
     */
    public PoiUtilRender fileName(String fileName) {
        this.fileName = fileName;
        return this;
    }
    /**
     * 设置sheet名称
     */
    public PoiUtilRender sheetName(String sheetName) {
        this.sheetName = sheetName;
        return this;
    }
    /**
     * 设置数据字段名称,字段的顺序就是excel列的顺序,不设置就是按照存储集合的顺序排列
     */
    public PoiUtilRender fields(String[] fields) {
        this.fields = fields;
        return this;
    }
    
 
    
    
}
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原文地址：https://www.cnblogs.com/aGboke/p/8920411.html