Question

我正在尝试重用Document和Field实例来提高性能（我已经尝试过这个文件中的100万行而不重用它花了20秒的实例）。

但是当我尝试这样做时，它需要花费太多时间并且一直在运行。

以前有人能遇到同样的问题吗？

这是尝试重用实例之前的现有代码，对于我创建新文档和字段的文件中的每一行。

FileInputStream fis;
                try {

                    fis = new FileInputStream(file);
                    String filePath= file.getPath();
                    BufferedReader br = new BufferedReader(
                            new InputStreamReader(fis, StandardCharsets.UTF_8));

                    String line = null;
                    while ((line = br.readLine()) != null) {

                        String[] lineTokens = line.split("\\|");
                        Document doc = new Document();
                        Field field1 = new TextField("field1", field1Value, Field.Store.YES);
                        doc.add(field1);
                        Field field2 = new StringField("field2", field2Value,Field.Store.YES);
                        doc.add(field2);
                        writer.addDocument(doc);
                    }
                    br.close();
                } catch (FileNotFoundException fnfe) {

                }

更改后

FileInputStream fis;
                try {

                    fis = new FileInputStream(file);
                    String filePath= file.getPath();
                    BufferedReader br = new BufferedReader(
                            new InputStreamReader(fis, StandardCharsets.UTF_8));

                    String line = null;
                    Document doc = new Document();
                    Field field1 = new TextField("field1", field1Value, Field.Store.YES);
                    Field field2 = new StringField("field2", field2Value,Field.Store.YES);
                    while ((line = br.readLine()) != null) {

                        //String[] lineTokens = line.split("\\|");

                        field1.setStringValue("field1Value");
                        doc.add(field1);

                        field2.setStringValue("field2Value");
                        doc.add(field2);
                        writer.addDocument(doc);
                    }
                    br.close();
                } catch (FileNotFoundException fnfe) {

                }

Answer 1

您不需要在每次迭代时将字段添加到doc。添加字段一次后，您需要做的就是更改字段值，然后将更改的文档写入索引，如下所示：

Document doc = new Document();
Field field1 = new TextField("field1", field1Value, Field.Store.YES);
doc.add(field1);
Field field2 = new StringField("field2", field2Value,Field.Store.YES);
doc.add(field2);
while ((line = br.readLine()) != null) {
    field1.setStringValue("field1Value");
    field2.setStringValue("field2Value");

    writer.addDocument(doc);
}

Lucene Indexing中的Document和Field实例重用

1 个答案: