前言

今天接到一个生成Echars关系图的需求，本来认为下班前两个小时就搞定了，但是使用Dom4j生成的过程中仍然很繁琐，也没有在网上找到源代码（可能是我太笨了），所以就自己记录一下。

我们要实现的图是: 这个.

全程使用Dom4j 最后使用流的方式写入response

 public void creatXml(HttpServletResponse response) throws IOException {
        Document document = DocumentHelper.createDocument();
        Element root = XmlUtils.getElement(document);
        //生成node节点
        creatNodes(root);
        //生成edges节点
        creatEdges(root);
        //写入到response输出流
        response.setContentType("text/xml;charset=utf-8");
        response.setHeader("cache-control", "no-cache");

        XMLWriter w = new XMLWriter(response.getWriter());
        w.write(document);
        w.close();

    }

/**
     * 生成node节点信息
     */
    public void creatNodes(Element root){

        Element root_nodes = root.addElement("nodes");
        List<String> node_num = rulerSerivice.selectOneAndTwo();

        //遍历插入
        for (String s : node_num) {
            Element root_node = root_nodes.addElement("node").addAttribute("id",s )
                    .addAttribute("label", s);

            Element root_attvalues = root_node.addElement("attvalues");
            root_attvalues.addElement("attvalue").addAttribute("for",""+s).addAttribute("value","0");
            root_node.addElement("viz:size").addAttribute("value","9.485714");
            root_node.addElement("viz:position").addAttribute("x", XYZUtils.xyzNum())
                    .addAttribute("y", XYZUtils.xyzNum())
                    .addAttribute("z", XYZUtils.xyzNum());

            root_node.addElement("viz:color").addAttribute("r",""+ RGButils.rgbNum())
                    .addAttribute("g",RGButils.rgbNum())
                    .addAttribute("b",RGButils.rgbNum());
        }
    }

 /**
     * 创建edges节点
     */
    public void creatEdges(Element root){

        List<Rule> rules = rulerSerivice.selectselectRulesAndTotal();

        Element root_edges = root.addElement("edges");
        for (Rule rule : rules) {
            Element root_edge = root_edges.addElement("edge");
            root_edge.addAttribute("id",rule.getRule_total());
            root_edge.addAttribute("source",rule.getRule_one().replace(" ",""));
            root_edge.addAttribute("target",rule.getRule_two().replace(" ",""));
            root_edge.addElement("attvalues").addElement("attvalue").addAttribute("置信度",String.valueOf(rule.getRule_confidence()));

        }

ublic class XmlUtils {

    public static Element getElement(Document document){
        //生成xml跟文件
        Element root = document.addElement("gexf")
                .addAttribute("xmlns","http://www.gexf.net/1.2draft")
                .addAttribute("version","1.2")
                .addAttribute("xmlns:viz","http://www.gexf.net/1.2draft/viz")
                .addAttribute("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance")
                .addAttribute("xsi:schemaLocation","http://www.gexf.net/1.2draft http://www.gexf.net/1.2draft/gexf.xsd")
                .addNamespace("viz","http://www.gexf.net/1.2draft/viz");

        Element root1 = root.addElement("meta").addAttribute("lastmodifieddate","2014-01-30");
        Element root2 = root.addElement("graph").addAttribute("defaultedgetype","undirected")
                .addAttribute("mode","static");


        root1.addElement("creator").addText("Gephi 0.8.1");
        root1.addElement("description");


        Element root21 = root2.addElement("attributes")
                .addAttribute("class","node")
                .addAttribute("mode","static");

        root21.addElement("attribute").addAttribute("id","modularity_class")
                .addAttribute("title","Modularity Class").addAttribute("type","integer");

        return root2;
    }

}