nutch-JE分词

阅读更多

先下载Nutch 1.0的源文件：

co http: //svn.apache.org /repos /asf /lucene /nutch /tags /release -1.0 . /nutch -1.0

更改查询语法解析部分：

改变tokenize的方式（原来为中文单字识别）

modify “src/java/org/apache/nutch/analysis/NutchAnalysis.jj”

line 130:

| >
change to:

| )+ >
run “javacc”

cd nutch -1.0 /src /java /org /apache /nutch /analysis
/usr / local /javacc -3.2 /bin /javacc NutchAnalysis.jj

3 files will be regenerated:

中文分析部分（查询和索引）：

将analyzer更换为JE中文分析器

a). copy “je-analysis-1.5.3.jar” to lib/

b). modify NutchDocumentAnalyzer.java

Index: src/java/org/apache/nutch/analysis/NutchDocumentAnalyzer.java
===================================================================
--- src/java/org/apache/nutch/analysis/NutchDocumentAnalyzer.java (revision 764668)
+++ src/java/org/apache/nutch/analysis/NutchDocumentAnalyzer.java (working copy)
@@ -27,6 +27,8 @@
import org.apache.lucene.analysis.Token;
import org.apache.hadoop.conf.Configuration;

+import jeasy.analysis.*;
+
/**
* The analyzer used for Nutch documents. Uses the JavaCC-defined lexical
* analyzer {@link NutchDocumentTokenizer}, with no stop list. This keeps it
@@ -65,8 +67,14 @@

/** Constructs a {@link NutchDocumentTokenizer}. */
public TokenStream tokenStream(String field, Reader reader) {
- return this.commonGrams.getFilter(new NutchDocumentTokenizer(reader),
- field);
+ if ("content".equals(field) || "title".equals(field) || "DEFAULT".equals(field)) {
+ MMAnalyzer analyzer=new MMAnalyzer();
+ return analyzer.tokenStream(field, reader);
+ }
+ else {
+ return this.commonGrams.getFilter(new NutchDocumentTokenizer(reader),
+ field);
+ }
}
}

重新编译Nutch:

在build.xml添加一条指令（在第195行的下面加入一行），使的编译war文件的时候加入je-analysis的jar文件。

build.xml

compile:

cd nutch -1.0
export ANT_HOME= /usr / local /apache-ant -1.7 .1
/usr / local /apache-ant -1.7 .1 /bin /ant
/usr / local /apache-ant -1.7 .1 /bin /ant war

使用新生成的含中文分词功能的模块:

只用到刚才编译生成的下面三个文件，替换Nutch 1.0的tarball解压后的对应文件