一、实现：添加Renderer.java，继承BarRenderer.java

 

 

package com.gllic.workweixin.mqdto;

import java.awt.*;

/**
 * @program: workweixin-mobile-api
 * @ClassName Renderer
 * @description: 初始化JFreeChart柱体颜色
 * @author: Marlo
 * @create: 2021-06-24 15:04
 * @Version 1.0
 **/
public class Renderer extends org.jfree.chart.renderer.category.BarRenderer{

        /**
         *
         */
        private static final long serialVersionUID = 784630226449158436L;
        private Paint[] colors;
        //初始化柱子颜色
        //private String[] colorValues = { "#FE5F63", "#4AD07C", "#FDCB54", "#FDCB54", "#FDCB54", "#FDCB54", "#FDCB54", "#FDCB54", "#FDCB54", "#FDCB54" };

        public Renderer(String[] colorValues) {
            if(colorValues.length==0){
                colorValues = new String[]{ "#21C3CA" };
            }
            colors = new Paint[colorValues.length];
            for (int i = 0; i < colorValues.length; i++) {
                colors[i] = Color.decode(colorValues[i]);
            }
        }

        //每根柱子以初始化的颜色不断轮循
        public Paint getItemPaint(int i, int j) {
            return colors[j % colors.length];
        }
}

二、调用：
//自定义颜色数组，根据数组内颜色循环显示柱体

String[] colorValues = {"#2197FF", "#7CCC48", "#21C3CA", "#21C3CA", "#21C3CA", "#21C3CA", "#21C3CA", "#21C3CA", "#21C3CA", "#21C3CA"};

BarRenderer renderer = new Renderer(colorValues);