-- 作者：jiangqiangln
-- 发布时间：10/19/2009 10:34:00 AM
-- [求助]我把一个可运行的java程序改为jsp+javabean，错在哪里
能正常运行的java程序：
package chy; import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader; import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory; /**
* @author Vision
*
*/
public class display { /**
* @param args
*/
public String filePath = "src\\ontology\\test.rdf-xml.owl";// 本体文件 Model model;//定义本体模型 /**
* 构造函数，加载本体模型
*/
public display() {
model = ModelFactory.createDefaultModel();
loadModel();
} /**
* 提交sparql的查询，输出返回结果
* @param queryStr
* @return
*/
public boolean runQuery(String queryStr) { Query query = QueryFactory.create(queryStr);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect(); while (results.hasNext()) {
QuerySolution soln = results.nextSolution();//查询结果中的每一条（称之为满足条件的一个solution）
System.out.print(soln.get("book").toString());
System.out.print("\t");
System.out.print(soln.get("hasName").toString());
System.out.print("\t");
//System.out.print(soln.get("o").toString());
/*Iterator iter = soln.varNames();
/*while (iter.hasNext()) {
String var = (String) iter.next();
System.out.print(soln.get(var).toString());
System.out.print("\t");
}*/
System.out.println("\n");
}
results = null;
qe.close(); return true;
} /**
* 加载本地文件形式的本体模型，失败系统退出
*
* @return
*/
private void loadModel() { InputStreamReader in;
try {
FileInputStream file = new FileInputStream(filePath);
in = new InputStreamReader(file, "UTF-8");//处理中文
model.read(in, null);
/*
* 基于规则的推理代码段，有必要的加 String rule = "[owl:inverseOf: (?pa
* owl:inverseOf ?pb) (?a ?pa ?b)->(?b ?pb ?a)]"; Reasoner reasoner =
* new GenericRuleReasoner(Rule.parseRules(rule)); model =
* ModelFactory.createInfModel(reasoner, model);
*/
in.close();
} catch (FileNotFoundException e) {
System.out.println("无法打开本体文件，程序将终止");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
System.exit(0);
} } public static void main(String[] args) {
display myLearn=new display();
String queryStr="prefix test: <http://vision.pku.edu.cn/test.owl#>"+
"select * "+
"from <http://vision.pku.edu.cn/test.owl>"+
"where "+
"{"+
"?book test:hasName ?hasName."+
"}";
myLearn.runQuery(queryStr );
} } 请看改后 javabean package cc; import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader; import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory; /**
* @author Vision
*
*/
public class Success { /**
* @param args
*/
public String filePath = "src\\ontology\\test.rdf-xml.owl";// 本体文件 Model model;//定义本体模型
ResultSet results;
private String queryStr;
/**
* 构造函数，加载本体模型
*/
public Success() {
}
public void setQuery(String queryStr){
this.queryStr=queryStr;
}
public String getQuery(){
return queryStr;
}
/**
* 提交sparql的查询，输出返回结果
* @param queryStr
* @return
*/
public ResultSet runQuery() {
model = ModelFactory.createDefaultModel();
loadModel();
Query query = QueryFactory.create(queryStr);
QueryExecution qe = QueryExecutionFactory.create(query, model);
results = qe.execSelect(); return results;
} /**
* 加载本地文件形式的本体模型，失败系统退出
*
* @return
*/
private void loadModel() { InputStreamReader in;
try {
FileInputStream file = new FileInputStream(filePath);
in = new InputStreamReader(file, "UTF-8");//处理中文
model.read(in, null);
/*
* 基于规则的推理代码段，有必要的加 String rule = "[owl:inverseOf: (?pa
* owl:inverseOf ?pb) (?a ?pa ?b)->(?b ?pb ?a)]"; Reasoner reasoner =
* new GenericRuleReasoner(Rule.parseRules(rule)); model =
* ModelFactory.createInfModel(reasoner, model);
*/
in.close();
} catch (FileNotFoundException e) {
System.out.println("无法打开本体文件，程序将终止");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
System.exit(0);
} }
}
jsp程序：
<jsp:useBean id="gh" class="cc.Success" />
<%
String queryStr="prefix test: <http://vision.pku.edu.cn/test.owl#>"+
"select * "+
"from <http://vision.pku.edu.cn/test.owl>"+
"where "+
"{"+
"?book test:hasName ?hasName."+
"}";
gh.setQuery(queryStr);
ResultSet results=gh.runQuery();
while (results.hasNext()) {
QuerySolution soln = results.nextSolution();//查询结果中的每一条（称之为满足条件的一个solution）
out.print(soln.get("book").toString());
out.print("\t");
out.print(soln.get("hasName").toString());
out.print("\t");
}
%> 大家看下错误在哪里？谢谢
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