［JAVA词形还原工具］Snowball

demo:http://snowball.tartarus.org/demo.php

jar download:http://snowball.tartarus.org/download.php (JAVA version里面有一处语法错误，自行修改后，自己动手生成jar包)

/**
 * Project Name:1008crosslanguage
 * File Name:Stemmer.java
 * Package Name:util
 * Date:Oct 10, 20158:48:09 PM
 * Copyright (c) 2015, max_xbw@163.com All Rights Reserved.
 *
 */
/**
 * Project Name:1008crosslanguage
 * File Name:Stemmer.java
 * Package Name:util
 * Date:Oct 10, 20158:48:09 PM
 * Copyright (c) 2015, max_xbw@163.com All Rights Reserved.
 *
 */

package util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.tartarus.snowball.ext.englishStemmer;

/**
 * ClassName:Stemmer <br/>
 * Function: TODO ADD FUNCTION. <br/>
 * Reason: TODO ADD REASON. <br/>
 * Date: Oct 10, 2015 8:48:09 PM <br/>
 * 
 * @author xubowen
 * @version
 * @since JDK 1.7
 * @see
 */
public class Stemmer {

    /**
     * main:(这里用一句话描述这个方法的作用). <br/>
     * TODO(这里描述这个方法适用条件 – 可选).<br/>
     *
     * @author xubowen
     * @param args
     * @since JDK 1.7
     */
    public static String stemString(String str) {
        str = str.toLowerCase();
        englishStemmer stemmer = new englishStemmer();
        stemmer.setCurrent(str);
        if (stemmer.stem()) {
            return stemmer.getCurrent();
        }
        return "";
    }

    public static List<String> stemStrList(List<String> strlist) {
        List<String> strlisttmp = new ArrayList<String>();
        for (String strtmp : strlist) {
            strlisttmp.add(stemString(strtmp));
            // System.out.println(strtmp + " ==> " + stemString(strtmp));
        }
        return strlisttmp;
    }

    public static Map<String, Double> stemStrMap(Map<String, Double> strmap) {
        Map<String, Double> strmaptmp = new HashMap<String, Double>();
        for (Map.Entry<String, Double> entry : strmap.entrySet()) {
            String strtmp = entry.getKey();
            double doubletmp = entry.getValue();
            strmaptmp.put(stemString(strtmp), doubletmp);
            // System.out.println(strtmp + " ==> " + stemString(strtmp));
        }
        return strmaptmp;
    }

    public static void main(String[] args) {
        System.out.println(stemString("caused"));
    }
}