Eclipse Maven:"Cannot be resolved to a type" 错误

Eclipse Maven: "Cannot be resolved to a type" error

我正在尝试使用 OpenNLP 1.5.0 构建一个简单的句子检测器。为此,我正在使用 Maven Eclipse。我从 http://opennlp.sourceforge.net/models-1.5/ 下载了 "en-sent.bin" 模型文件并将其放在 src/main/resources 文件夹中。我的 pom.xml 文件如下。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>dakshila.research</groupId>
    <artifactId>new1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>new1</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project> 

在 'src/main/java' 文件夹中,我创建了 "dk.research.new1" 包,其 App.java 文件包含以下代码。

package dk.research.new1;

public class App{
    public void SentenceSplitter() {
        SentenceDetector sentenceDetector = null;
        InputStream modelIn = null;

        try {
           modelIn = getClass().getResourceAsStream("en-sent.bin");
           final SentenceModel sentenceModel = new SentenceModel(modelIn);
           modelIn.close();
           sentenceDetector = new SentenceDetectorME(sentenceModel);
        } catch (final IOException ioe) {
               ioe.printStackTrace();
        } finally {
            if (modelIn != null) {
                try {
                    modelIn.close();
                } catch (final IOException e) {}
            }
        }
        String sentences[]=(sentenceDetector.sentDetect("I am a student. I am learning programming. I like java language."));
        for(int i=0; i<sentences.length;i++) {
            System.out.println(sentences[i]);
        }
    }
}

我在 App.java 文件中收到以下错误消息。

为什么会出现这些错误?我试过 Project->Clean 但我无法摆脱这些错误。我需要做什么才能解决这个问题?

在您的 POM 的 <dependencies> 部分添加:

<dependency>
  <groupId>org.apache.opennlp</groupId>
  <artifactId>opennlp-tools</artifactId>
  <version>1.6.0</version>
</dependency>

然后,您必须在 Java 文件中的 public class App 行之前导入 类 添加:

import java.io.IOException;
import java.io.InputStream;

import opennlp.tools.sentdetect.SentenceDetector;
import opennlp.tools.sentdetect.SentenceDetectorME;
import opennlp.tools.sentdetect.SentenceModel;