最近在做图表统计的时候，将数据存储在XML文件中。于是需要在后台处理好数据后再创建一个XML文件。由于JSCharts图表工具需要XML文件格式大体相同，所以以饼状图为例有：一个JSChart根节点，再有处于同一级的dataset 、colorset、optionset。
我的思路是创建一个方法，参数为HashMap，传入dataset 、optionset节点下的属性值，第一个属性值作为HashMap的key，第二个属性值作为value。Colorset只有一个属性值，因此可用ArrayList来接收值。

要生成的目标XML文件：

Java使用XmlPull创建XML文件示例代码：

public static void createJSChartsXml(HashMap datas,ArrayList colors,HashMap options) throws Exception{
		XmlSerializer serializer = new KXmlSerializer();
		serializer.setOutput(new FileOutputStream(new File("D:\\data.xml")),"utf-8");
		serializer.startDocument(null, true);
		serializer.startTag(null, "JSChart");
		serializer.startTag(null, "dataset");
		serializer.attribute(null, "type", "pie");
		Iterator iterator = datas.keySet().iterator();
		while(iterator.hasNext()){
			String key = iterator.next();
			serializer.startTag(null, "data");
			serializer.attribute(null, "unit", key);
			serializer.attribute(null, "value",datas.get(key));
			serializer.endTag(null, "data");
		}
		serializer.endTag(null, "dataset");
		serializer.startTag(null, "colorset");
		for(String color : colors){
			serializer.startTag(null, "color");
			serializer.attribute(null, "value", color);
			serializer.endTag(null, "color");
		}
		serializer.endTag(null, "colorset");
		serializer.startTag(null, "optionset");
		Iterator op_iterator = options.keySet().iterator();
		while(op_iterator.hasNext()){
			String op_key = op_iterator.next();
			serializer.startTag(null, "option");
			serializer.attribute(null, "set", op_key);
			serializer.attribute(null, "value",options.get(op_key));
			serializer.endTag(null, "option");
		}
		serializer.endTag(null, "optionset");
		serializer.endTag(null, "JSChart");
		serializer.endDocument();
}

这段代码在创建的时候由于HashMap的key不能重复，所以导致生成下面四句的时候变成只有一句，因为后面三个value都被覆盖了。

为保证正确生成XML需要对代码进行部分修改，将value类型改为字符串数组即可解决：

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import org.kxml2.io.KXmlSerializer;
import org.xmlpull.v1.XmlSerializer;

public class XmlTools {
	
	/**
	 * 创建JSCharts xml文件
	 * @author ShelWee
	 * @param datas key为unit的值，value为value的值
	 * @param colors
	 * @param options key为set的值，value为value的值
	 * @throws Exception
	 */
	public static void createJSChartsXml(HashMap datas,ArrayList colors,HashMap options) throws Exception{
		XmlSerializer serializer = new KXmlSerializer();
		serializer.setOutput(new FileOutputStream(new File("D:\\data.xml")),"utf-8");
		serializer.startDocument(null, true);
		serializer.startTag(null, "JSChart");
		serializer.startTag(null, "dataset");
		serializer.attribute(null, "type", "pie");
		Iterator iterator = datas.keySet().iterator();
		while(iterator.hasNext()){
			String key = iterator.next();
			serializer.startTag(null, "data");
			serializer.attribute(null, "unit", key);
			serializer.attribute(null, "value",datas.get(key));
			serializer.endTag(null, "data");
		}
		serializer.endTag(null, "dataset");
		serializer.startTag(null, "colorset");
		for(String color : colors){
			serializer.startTag(null, "color");
			serializer.attribute(null, "value", color);
			serializer.endTag(null, "color");
		}
		serializer.endTag(null, "colorset");
		serializer.startTag(null, "optionset");
		Iterator op_iterator = options.keySet().iterator();
		while(op_iterator.hasNext()){
			String op_key = op_iterator.next();
			String[] values = options.get(op_key);
			for(String op_value:values){
				serializer.startTag(null, "option");
				serializer.attribute(null, "set", op_key);
				serializer.attribute(null, "value",op_value);
				serializer.endTag(null, "option");
			}
		}
		serializer.endTag(null, "optionset");
		serializer.endTag(null, "JSChart");
		serializer.endDocument();
	}

	/**
	 * 调用示例
	 * @param args
	 */
	public static void main(String[] args) {
		HashMap hashMap = new HashMap();
		hashMap.put("A", "40");
		hashMap.put("B", "16");
		hashMap.put("C", "20");
		hashMap.put("D", "10");
		hashMap.put("E", "10");
		hashMap.put("F", "4");
		
		ArrayList colors = new ArrayList();
		colors.add("#99CDFB");
		colors.add("#3366FB");
		colors.add("#0000FA");
		colors.add("#F8CC00");
		colors.add("#F89900");
		colors.add("#F76600");
		
		HashMap options = new HashMap();
		options.put("setSize",new String[]{"600, 300"});
		options.put("setTitle", new String[]{"'XML自动创建图表'"});
		options.put("setTitleFontFamily", new String[]{"'Times New Roman'"});
		options.put("setTitleFontSize", new String[]{"14"});
		options.put("setTitleColor", new String[]{"'#0F0F0F'"});
		options.put("setPieRadius",new String[]{ "95"});
		options.put("setPieValuesColor", new String[]{"'#FFFFFF'"});
		options.put("setPieValuesFontSize",new String[]{ "9"});
		options.put("setPiePosition", new String[]{"180, 165"});
		options.put("setShowXValues", new String[]{"false"});
		options.put("setLegend", new String[]{"'#99CDFB', 'Papers where authors found'","'#3366FB', 'Papers which cite from other articles'",
				"'#0000FA', 'Papers which cite from news'","'#F8CC00', 'Papers which lack crucial'","'#F89900', 'Papers with different conclusion'",
				"'#F76600', 'Papers with useful information'"});
		options.put("setLegendShow", new String[]{"true"});
		options.put("setLegendFontFamily",new String[]{ "'Times New Roman'"});
		options.put("setLegendFontSize",new String[]{ "10"});
		options.put("setLegendPosition",new String[]{ "350, 120"});
		options.put("setPieAngle",new String[]{ "30"});
		options.put("set3D", new String[]{"true"});
		try {
			createJSChartsXml(hashMap, colors, options);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}