Java VTD-XML找不到符号错误。如何在编译java时正确引用包?
我不是Java程序员,但需要编写一个Java程序来解析一个大的(400mb)xml文件。我选择了vtd xml,但不知道如何正确引用该包。我不想使用maven/gradle,因为我不经常用Java编程,只需要引用这个包。我有:Java VTD-XML找不到符号错误。如何在编译java时正确引用包?,java,xml,vtd-xml,Java,Xml,Vtd Xml,我不是Java程序员,但需要编写一个Java程序来解析一个大的(400mb)xml文件。我选择了vtd xml,但不知道如何正确引用该包。我不想使用maven/gradle,因为我不经常用Java编程,只需要引用这个包。我有: import com.ximpleware.*; 在我的java文件的顶部。我将vtd xml源代码保存在与java文件相同的目录中,因此目录结构如下所示: my_java.java vtd_xml/com vtd_xml/example vtd_xml/install
import com.ximpleware.*;
在我的java文件的顶部。我将vtd xml源代码保存在与java文件相同的目录中,因此目录结构如下所示:
my_java.java
vtd_xml/com
vtd_xml/example
vtd_xml/install.txt
vtd_xml/Readme.txt
vtd_xml/ximpleware_2.12-java-light.zip
vtd_xml/vtd-xml_light-2-12.jar
zephyr_4.java:8: error: cannot find symbol
import com.ximpleware.VTDGen;
^
symbol: class VTDGen
location: package com.ximpleware
zephyr_4.java:10: error: cannot find symbol
import com.ximpleware.AutoPilot;
^
symbol: class AutoPilot
location: package com.ximpleware
zephyr_4.java:11: error: cannot find symbol
import com.ximpleware.XMLModifier;
^
symbol: class XMLModifier
location: package com.ximpleware
zephyr_4.java:16: error: cannot find symbol
public static void main(String argv[]) throws NavException, IOException{
^
symbol: class NavException
location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
VTDGen vg = new VTDGen();
^
symbol: class VTDGen
location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
VTDGen vg = new VTDGen();
^
symbol: class VTDGen
location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
AutoPilot ap = new AutoPilot(vn);
^
symbol: class AutoPilot
location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
AutoPilot ap = new AutoPilot(vn);
^
symbol: class AutoPilot
location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
XMLModifier xm = new XMLModifier(vn);
^
symbol: class XMLModifier
location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
XMLModifier xm = new XMLModifier(vn);
^
symbol: class XMLModifier
location: class zephyr_4
10 errors
我导出了类路径,以便
echo $CLASSPATH
返回
vtd_xml/vtd-xml_light-2-12.jar
但是当我编译java文件时
javac my_java.java
我遇到以下(令人沮丧的)错误:
我做错了什么?以下是我的源代码,以备不时之需:
import java.io.*;
import com.ximpleware.*;
import java.util.*;
public class my_java {
public static void main(String argv[]) throws NavException, IOException{
// open a file and read the content into a byte array
VTDGen vg = new VTDGen();
if (vg.parseFile("pubmed_result.xml", true)){
VTDNav vn = vg.getNav();
AutoPilot ap = new AutoPilot(vn);
XMLModifier xm = new XMLModifier(vn);
String query = "count(//PubmedArticleSet/PubmedArticle"
+ "/MedlineCitation/Article"
+ "/AuthorList/Author[contains(LastName,\"Sangani\") and "
+ "contains(ForeName, \"Rahul G\")])";
ap.selectXPath(query);
ap.bind(vn);
int i = -1;
while((i=ap.evalXPathToNumber())!=-1){
System.out.println(vn.toNormalizedPathString());
}
}
}
}
更新我的符号错误看起来仍然像:
my_java.java
vtd_xml/com
vtd_xml/example
vtd_xml/install.txt
vtd_xml/Readme.txt
vtd_xml/ximpleware_2.12-java-light.zip
vtd_xml/vtd-xml_light-2-12.jar
zephyr_4.java:8: error: cannot find symbol
import com.ximpleware.VTDGen;
^
symbol: class VTDGen
location: package com.ximpleware
zephyr_4.java:10: error: cannot find symbol
import com.ximpleware.AutoPilot;
^
symbol: class AutoPilot
location: package com.ximpleware
zephyr_4.java:11: error: cannot find symbol
import com.ximpleware.XMLModifier;
^
symbol: class XMLModifier
location: package com.ximpleware
zephyr_4.java:16: error: cannot find symbol
public static void main(String argv[]) throws NavException, IOException{
^
symbol: class NavException
location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
VTDGen vg = new VTDGen();
^
symbol: class VTDGen
location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
VTDGen vg = new VTDGen();
^
symbol: class VTDGen
location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
AutoPilot ap = new AutoPilot(vn);
^
symbol: class AutoPilot
location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
AutoPilot ap = new AutoPilot(vn);
^
symbol: class AutoPilot
location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
XMLModifier xm = new XMLModifier(vn);
^
symbol: class XMLModifier
location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
XMLModifier xm = new XMLModifier(vn);
^
symbol: class XMLModifier
location: class zephyr_4
10 errors
您需要返回vtd xml网站并下载vtd xml的标准版。。。要解释这一点: 实际上有3个vtd xml版本: ---轻巧的一款是为移动设备设计的裸骨解析器 ---standard是功能最强大/功能最丰富、最完整的一款 ---扩展版功能较少,但支持高达256 gb的文档 所以你要找的是标准版,我想 这里是链接 您的代码中有一个小错误 ap.evalXPathToNumber返回一个double,而不是节点集,因此您可以直接分配返回的结果并使用它。。。虽然循环不必要
另一个建议是,可以打开VTDGen的vg.setLCLevel(5),这可能有助于提高xpath性能…Ok。我下载了这个文件,但我仍然得到相同的“找不到符号错误”。我导出了我的类路径以引用jar文件(我在Linux机器上),但我一定是做错了什么。。。知道它可能是什么吗?类路径是正确的。jvm的版本是1.7.0.101。我在一台linux机器上。vtd xml代码在运行之前必须编译吗?当然不是。。。你删除了类路径的旧引用了吗?另一件要检查的事情是确保你的类路径是全局的。。。不是本地的,你能给我看一下符号错误的脚本吗?