2 Lucene笔记（二）：创建LuceneUtils工具

蔚落 2022-09-21 13:04 104阅读 0赞

publicclass LuceneUtils {
         public LuceneUtils() {}
    
         private static Directory directory;
         private static Version version;
         private static Analyzer analyzer;
         private static MaxFieldLength maxFieldLength;
    
         static{
               try {
                   directory = FSDirectory. open(new File("F:/LuceneDB")) ;
                   version = Version. LUCENE_30;
                   analyzer = new StandardAnalyzer( version);
                   maxFieldLength = MaxFieldLength.LIMITED;
              } catch (IOException e) {
                   e.printStackTrace();
                   throw new RuntimeException( e);
              }          
         }    
         public static Directory getDirectory() {
               return directory;
         }
         public static void setDirectory(Directory directory) {
              LuceneUtils. directory = directory;
         }
         public static Version getVersion() {
               return version;
         }
         public static void setVersion(Version version) {
              LuceneUtils. version = version;
         }
         public static Analyzer getAnalyzer() {
               return analyzer;
         }
         public static void setAnalyzer(Analyzer analyzer) {
              LuceneUtils. analyzer = analyzer;
         }
         public static MaxFieldLength getMaxFieldLength() {
               return maxFieldLength;
         }
         public static void setMaxFieldLength(MaxFieldLength maxFieldLength) {
              LuceneUtils. maxFieldLength = maxFieldLength ;
         }
        /** *javabean-->doc */ 
         public static Document javaBeanToDocument(Object obj) throws Exception {
              Document doc = new Document();
               Class clazz = obj.getClass();
              java.lang.reflect.Field[] fields = clazz.getDeclaredFields();
               for(java.lang.reflect.Field field : fields ){
                   field.setAccessible( true); //暴力反射
                  String name = field.getName();
                  String methodName = "get"+ name.substring(0, 1).toUpperCase()+name.substring(1,name .length());
                  Method method = clazz.getMethod(methodName , null);
                  String value = method.invoke(obj, null).toString();
                   //System.out.println(name+"="+value);
                   doc.add( new Field( name, value, Store. YES, Index.ANALYZED));
              }
               return doc;
         }
         /** * doc-->javabean * / public static Object documentToJavaBean(Document doc, Class clazz) throws Exception{ Object obj = clazz.newInstance(); java.lang.reflect.Field[] fields = clazz.getDeclaredFields(); for(java.lang.reflect.Field field : fields ){ field.setAccessible( true); //暴力反射 String name = field.getName(); String value = doc.get( name); BeanUtils. setProperty(obj, name, value); } return obj; } //测试 public static void main(String[] args) throws Exception { Article article = new Article(1, "搜索标题", "通过关键字搜索文章，搜点什么好呢？" ); Document document = LuceneUtils.javaBeanToDocument(article); /*System.out.println(document.get("id")); System.out.println(document.get("title")); System.out.println(document.get("content"));*/
              System. out.println( "----------------------------------" );
              Article article1 = (Article) LuceneUtils.documentToJavaBean(document,Article.class);
              System. out.println( article1);
         }
    }