private void parseDataSource(String file) throws Exception { Digester digester = new Digester(); digester.setValidating(false); digester.push(this); digester.addCallMethod("datasources/datasource", "addDataSource", 6); digester.addCallParam("datasources/datasource/name", 0); digester.addCallParam("datasources/datasource/driver", 1); digester.addCallParam("datasources/datasource/url", 2); digester.addCallParam("datasources/datasource/username", 3); digester.addCallParam("datasources/datasource/password", 4); digester.addCallParam("datasources/datasource/internallogon", 5); digester.parse(new File(file)); }
@Test // <certification>在程序中对应一个字符串,故而没有列出。 public void digest() { Digester digester = new Digester(); // 注意,此处并没有象上例一样使用push,是因为此处从根元素创建了一个对//象实例 digester.addObjectCreate("academy", Academy.class); // 将< academy >的属性与对象的属性关联 digester.addSetProperties("academy"); digester.addObjectCreate("academy/student", Student.class); digester.addSetProperties("academy/student"); digester.addObjectCreate("academy/student/course", Course.class); digester.addBeanPropertySetter("academy/student/course/id"); digester.addBeanPropertySetter("academy/student/course/name"); digester.addSetNext("academy/student/course", "addCourse"); digester.addSetNext("academy/student", "addStudent"); digester.addObjectCreate("academy/teacher", Teacher.class); digester.addSetProperties("academy/teacher"); // 当遇到academy/teacher/certification时,调用addCertification digester.addCallMethod("academy/teacher/certification", "addCertification", 1); // 设置addCertification的参数值,此处的0表示这个元素体的第一个值 // 为参数值传入addCertification。在此处,即为<certification>的值。 // (因为就只有一个) digester.addCallParam("academy/teacher/certification", 0); digester.addSetNext("academy/teacher", "addTeacher"); try { Academy a = (Academy) digester.parse(xmlFile); System.out.print(a); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
/** * 解析base.mapred.xml配置信息到java对象 * * @return 配置信息pojo对象 */ public static MapreduceConfigInfo parseConfig(String extraPartitions) { Digester digester = new Digester(); digester.setValidating(false); digester.addObjectCreate("mapred", MapreduceConfigInfo.class); digester.addBeanPropertySetter("mapred/baseId"); digester.addBeanPropertySetter("mapred/projectId"); digester.addBeanPropertySetter("mapred/resourceName"); digester.addBeanPropertySetter("mapred/idePath"); digester.addBeanPropertySetter("mapred/mapOutputKey"); digester.addBeanPropertySetter("mapred/mapOutputValue"); digester.addBeanPropertySetter("mapred/partitionColumns"); digester.addBeanPropertySetter("mapred/outputKeySortColumns"); digester.addBeanPropertySetter("mapred/outputKeySortOrders"); digester.addBeanPropertySetter("mapred/outputGroupingColumns"); digester.addBeanPropertySetter("mapred/numReduceTask"); digester.addBeanPropertySetter("mapred/memoryForMapTask"); digester.addBeanPropertySetter("mapred/memoryForReduceTask"); digester.addBeanPropertySetter("mapred/jobLauncher"); digester.addBeanPropertySetter("mapred/mapper"); digester.addBeanPropertySetter("mapred/reducer"); digester.addBeanPropertySetter("mapred/combiner"); digester.addObjectCreate("mapred/inputTables/table", OdpsTableInfo.class); digester.addBeanPropertySetter("mapred/inputTables/table/name"); digester.addCallMethod("mapred/inputTables/table/partitions/partition", "addPartition", 1); digester.addCallParam("mapred/inputTables/table/partitions/partition", 0); digester.addSetNext("mapred/inputTables/table", "addInputTable"); digester.addObjectCreate("mapred/outputTable", OdpsTableInfo.class); digester.addBeanPropertySetter("mapred/outputTable/name"); digester.addCallMethod("mapred/outputTable/partition", "addPartition", 1); digester.addCallParam("mapred/outputTable/partition", 0); digester.addSetNext("mapred/outputTable", "setOutputTable"); InputStream is = ClassLoader.getSystemResourceAsStream("META-INF/base.mapred.xml"); try { MapreduceConfigInfo conf = digester.parse(is); // 将额外分区合并入输入表和输出表 if (!extraPartitions.isEmpty()) { String[] eps = extraPartitions.split(":"); for (String ep : eps) { int pos = ep.indexOf("/"); String tableName = ep.substring(0, pos); String partition = ep.substring(pos + 1); for (OdpsTableInfo t : conf.getInputTables()) { if (t.getName().equals(tableName)) { t.addPartition(partition); } } if (conf.getOutputTable().getName().equals(tableName)) { conf.getOutputTable().addPartition(partition); } } } return conf; } catch (Exception e) { return null; } }