echarts连接neo4j知识图谱 java - CSDN文库

要实现ECharts连接Neo4j知识图谱，你可以使用Neo4j提供的Java驱动程序来与Neo4j数据库进行交互，并使用ECharts的JavaScript库来呈现数据。以下是一个基本的Java代码示例，该示例使用Neo4j Java驱动程序和ECharts JavaScript库来连接Neo4j知识图谱并呈现数据： ```java import org.neo4j.driver.*; import org.neo4j.driver.types.Node; import org.neo4j.driver.types.Relationship; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class Neo4jEchartsExample { public static void main(String[] args) { // Connect to Neo4j database Driver driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("username", "password")); Session session = driver.session(); // Query Neo4j database to get nodes and relationships String query = "MATCH (n)-[r]->(m) RETURN n,r,m"; Result result = session.run(query); // Create lists to hold nodes and edges List<Map<String, Object>> nodes = new ArrayList<>(); List<Map<String, Object>> edges = new ArrayList<>(); // Loop through result and add nodes and edges to lists while (result.hasNext()) { Record record = result.next(); Node node1 = record.get("n").asNode(); Node node2 = record.get("m").asNode(); Relationship relationship = record.get("r").asRelationship(); // Add node1 to nodes list Map<String, Object> node1Map = new HashMap<>(); node1Map.put("id", node1.id()); node1Map.put("label", node1.labels().iterator().next()); node1Map.put("properties", node1.asMap()); nodes.add(node1Map); // Add node2 to nodes list Map<String, Object> node2Map = new HashMap<>(); node2Map.put("id", node2.id()); node2Map.put("label", node2.labels().iterator().next()); node2Map.put("properties", node2.asMap()); nodes.add(node2Map); // Add edge to edges list Map<String, Object> edgeMap = new HashMap<>(); edgeMap.put("source", node1.id()); edgeMap.put("target", node2.id()); edgeMap.put("label", relationship.type()); edgeMap.put("properties", relationship.asMap()); edges.add(edgeMap); } // Close Neo4j session and driver session.close(); driver.close(); // Generate ECharts graph using nodes and edges lists String echartsScript = generateEchartsScript(nodes, edges); // Print ECharts script to console System.out.println(echartsScript); } private static String generateEchartsScript(List<Map<String, Object>> nodes, List<Map<String, Object>> edges) { StringBuilder scriptBuilder = new StringBuilder(); // Add ECharts script header scriptBuilder.append("<html><head><script src=\"https://cdn.jsdelivr.net/npm/echarts@5.1.0/dist/echarts.min.js\"></script></head><body><div id=\"main\" style=\"width: 100%; height: 100%;\"></div><script>"); // Add ECharts script to create graph scriptBuilder.append("var chart = echarts.init(document.getElementById('main'));"); scriptBuilder.append("chart.showLoading();"); scriptBuilder.append("var categories = ["); scriptBuilder.append(nodes.stream().map(node -> "'" + node.get("label").toString() + "'").distinct().reduce((s1, s2) -> s1 + "," + s2).orElse("")); scriptBuilder.append("];"); scriptBuilder.append("var data = ["); scriptBuilder.append(nodes.stream().map(node -> "{id: '" + node.get("id").toString() + "', name: '" + node.get("label").toString() + "', symbolSize: 50, itemStyle: {normal: {color: '#0099CC'}}}").reduce((s1, s2) -> s1 + "," + s2).orElse("")); scriptBuilder.append("];"); scriptBuilder.append("var links = ["); scriptBuilder.append(edges.stream().map(edge -> "{source: '" + edge.get("source").toString() + "', target: '" + edge.get("target").toString() + "', name: '" + edge.get("label").toString() + "'}").reduce((s1, s2) -> s1 + "," + s2).orElse("")); scriptBuilder.append("];"); scriptBuilder.append("chart.hideLoading();"); scriptBuilder.append("chart.setOption({title: {text: 'Neo4j Knowledge Graph'},tooltip: {},legend: [{data: categories}],series: [{type: 'graph',layout: 'force',symbolSize: 50,roam: true,edgeSymbol: ['circle', 'arrow'],edgeSymbolSize: [4, 10],edgeLabel: {normal: {textStyle: {fontSize: 20}}, emphasis: {textStyle: {fontSize: 20}}},label: {normal: {show: true, textStyle: {fontSize: 20}}, emphasis: {show: true}},force: {repulsion: 1000},data: data,links: links}]});"); // Add ECharts script footer scriptBuilder.append("</script></body></html>"); return scriptBuilder.toString(); } } ``` 在上面的示例中，我们首先使用Neo4j Java驱动程序连接到Neo4j数据库。然后，我们执行一个查询来获取节点和关系，并将它们添加到节点和边缘列表中。最后，我们使用节点和边缘列表来生成ECharts图表的JavaScript代码。在ECharts脚本中，我们首先定义节点和边缘的类别，然后将它们添加到数据列表中。然后，我们将数据和链接添加到ECharts选项对象中，并将它们传递给ECharts的图形系列选项。最后，我们将ECharts图表呈现在HTML页面上。请注意，这只是一个基本的示例，你可以根据自己的需求进行修改和扩展。

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