POI 生成条件格式

用EXCEL导出报表时，很多情况下，需要在EXCEL中用颜色区分各种数据， 当然可以在创建Cell的时候，直接赋值style 来实现，但还有一种方式，可以通过设置条件格式来实现。只要满足设定的规则，就显示不同的颜色等。
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下面这段代码例子就实现了这样一个功能。

package com.yihaomen.poi.sample;

import java.io.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.*;
import org.apache.poi.ss.usermodel.ComparisonOperator;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.util.CellRangeAddress;
public class CondictionRule {  
        public static void main(String[] args) throws Exception{
                /* Create Workbook and Worksheet - Add Input Rows */
                HSSFWorkbook my_workbook = new HSSFWorkbook();
                HSSFSheet my_sheet = my_workbook.createSheet("Conditional_Formatting");
                Row row = my_sheet.createRow(0);                
                Cell cell = row.createCell(0);
                cell.setCellValue(new Double(10));
                row = my_sheet.createRow(1);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(12));
                row = my_sheet.createRow(2);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(13));
                row = my_sheet.createRow(3);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(18));
                
                /* Access conditional formatting facet layer */
                HSSFSheetConditionalFormatting my_cond_format_layer = my_sheet.getSheetConditionalFormatting();
                
                /* Create a Rule - Less than or Equal to */
                HSSFConditionalFormattingRule my_rule = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.LE, "10");
                
                /* Define font formatting if rule is met */             
                HSSFFontFormatting my_rule_pattern = my_rule.createFontFormatting();
                my_rule_pattern.setFontColorIndex(IndexedColors.GREEN.getIndex());
                
                /* Set background fill to Gold*/                
                HSSFPatternFormatting fill_pattern = my_rule.createPatternFormatting();
                fill_pattern.setFillBackgroundColor(IndexedColors.GOLD.index);
                
                /* Define second conditional formatting rules - multiple conditions- greater than or equal to  */
                HSSFConditionalFormattingRule my_rule_2 = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.GE, "13");
                
                /* Format borders for all matching cells using  HSSFBorderFormatting */
                HSSFBorderFormatting border_pattern=my_rule_2.createBorderFormatting();
                border_pattern.setBorderLeft(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderRight(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderTop(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderBottom(BorderFormatting.BORDER_DOUBLE);
                /* You can set border color too, by using relevant methods */
                
                /* Set fill color to Green */
                HSSFPatternFormatting fill_pattern_2 = my_rule_2.createPatternFormatting();
                fill_pattern_2.setFillBackgroundColor(IndexedColors.YELLOW.index);
                
                /* OK, we have defined mutliple rules. Time to attach two rules to same range. We create an array of rules now */
                ConditionalFormattingRule [] multiple_rules = {my_rule,my_rule_2};
                /* Create a Cell Range Address */
                CellRangeAddress[] my_data_range = {CellRangeAddress.valueOf("A1:A4")};
                
                /* Attach array of rules to the same range */
                my_cond_format_layer.addConditionalFormatting(my_data_range,multiple_rules);
                
                /* Write changes to the workbook */
                FileOutputStream out = new FileOutputStream(new File("C:\\multiple_conditonal_formatting.xls"));
                my_workbook.write(out);
                out.close();
                
        }
}

如果你用的是XSSF的话，用如下方式：

import java.io.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.*;
import org.apache.poi.ss.usermodel.ComparisonOperator;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.util.CellRangeAddress;
public class MultipleRulesConditionalFormatting {  
        public static void main(String[] args) throws Exception{
                /* Create Workbook and Worksheet - Add Input Rows */
                HSSFWorkbook my_workbook = new HSSFWorkbook();
                HSSFSheet my_sheet = my_workbook.createSheet("Conditional_Formatting");
                Row row = my_sheet.createRow(0);                
                Cell cell = row.createCell(0);
                cell.setCellValue(new Double(10));
                row = my_sheet.createRow(1);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(12));
                row = my_sheet.createRow(2);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(13));
                row = my_sheet.createRow(3);            
                cell = row.createCell(0);
                cell.setCellValue(new Double(18));
                
                /* Access conditional formatting facet layer */
                HSSFSheetConditionalFormatting my_cond_format_layer = my_sheet.getSheetConditionalFormatting();
                
                /* Create a Rule - Less than or Equal to */
                HSSFConditionalFormattingRule my_rule = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.LE, "10");
                
                /* Define font formatting if rule is met */             
                HSSFFontFormatting my_rule_pattern = my_rule.createFontFormatting();
                my_rule_pattern.setFontColorIndex(IndexedColors.GREEN.getIndex());
                
                /* Set background fill to Gold*/                
                HSSFPatternFormatting fill_pattern = my_rule.createPatternFormatting();
                fill_pattern.setFillBackgroundColor(IndexedColors.GOLD.index);
                
                /* Define second conditional formatting rules - multiple conditions- greater than or equal to  */
                HSSFConditionalFormattingRule my_rule_2 = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.GE, "13");
                
                /* Format borders for all matching cells using  HSSFBorderFormatting */
                HSSFBorderFormatting border_pattern=my_rule_2.createBorderFormatting();
                border_pattern.setBorderLeft(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderRight(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderTop(BorderFormatting.BORDER_DOUBLE);
                border_pattern.setBorderBottom(BorderFormatting.BORDER_DOUBLE);
                /* You can set border color too, by using relevant methods */
                
                /* Set fill color to Green */
                HSSFPatternFormatting fill_pattern_2 = my_rule_2.createPatternFormatting();
                fill_pattern_2.setFillBackgroundColor(IndexedColors.YELLOW.index);
                
                /* OK, we have defined mutliple rules. Time to attach two rules to same range. We create an array of rules now */
                ConditionalFormattingRule [] multiple_rules = {my_rule,my_rule_2};
                /* Create a Cell Range Address */
                CellRangeAddress[] my_data_range = {CellRangeAddress.valueOf("A1:A4")};
                
                /* Attach array of rules to the same range */
                my_cond_format_layer.addConditionalFormatting(my_data_range,multiple_rules);
                
                /* Write changes to the workbook */
                FileOutputStream out = new FileOutputStream(new File("C:\\multiple_conditonal_formatting.xls"));
                my_workbook.write(out);
                out.close();
                
        }
}

From：一号门