比较lucene各种英文分析器Analyzer

package analyzer;

import java.io.Reader;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.analysis.StopAnalyzer;
import org.apache.lucene.analysis.StopFilter;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;

public class TestAnalyzer {
private static String testString1 = "The quick brown fox jumped over the lazy dogs";
private static String testString2 = "xy&z mail is - xyz@sohu.com";
public static void testWhitespace(String testString) throws Exception{
Analyzer analyzer = new WhitespaceAnalyzer();
Reader r = new StringReader(testString);
Tokenizer ts = (Tokenizer) analyzer.tokenStream("", r);
System.err.println("=====Whitespace analyzer====");
System.err.println("分析方法：空格分割");
Token t;
while ((t = ts.next()) != null) {
System.out.println(t.termText());
}
}
public static void testSimple(String testString) throws Exception{
Analyzer analyzer = new SimpleAnalyzer();
Reader r = new StringReader(testString);
Tokenizer ts = (Tokenizer) analyzer.tokenStream("", r);
System.err.println("=====Simple analyzer====");
System.err.println("分析方法：空格及各种符号分割");
Token t;
while ((t = ts.next()) != null) {
System.out.println(t.termText());
}
}
public static void testStop(String testString) throws Exception{
Analyzer analyzer = new StopAnalyzer();
Reader r = new StringReader(testString);
StopFilter sf = (StopFilter) analyzer.tokenStream("", r);
System.err.println("=====stop analyzer====");
System.err.println("分析方法：空格及各种符号分割,去掉停止词，停止词包括 is,are,in,on,the等无实际意义的词");
//停止词
Token t;
while ((t = sf.next()) != null) {
System.out.println(t.termText());
}
}
public static void testStandard(String testString) throws Exception{
Analyzer analyzer = new StandardAnalyzer();
Reader r = new StringReader(testString);
StopFilter sf = (StopFilter) analyzer.tokenStream("", r);
System.err.println("=====standard analyzer====");
System.err.println("分析方法：混合分割,包括了去掉停止词，支持汉语");
Token t;
while ((t = sf.next()) != null) {
System.out.println(t.termText());
}
}
public static void main(String[] args) throws Exception{
//        String testString = testString1;
String testString = testString2;
System.out.println(testString);
testWhitespace(testString);
testSimple(testString);
testStop(testString);
testStandard(testString);
}

}