我有以下XML文件。尽可能地，有2个单独的文件：
<doc>
<str name="id">1</str>
<str name="full_message_t">"""“God loves you more daddy....God loves them more</str>
<str name="source_t">” tweets teenage daughter of #MH370 chief steward http://t.co/Abw96As7xv"""</str>
<str name="news_t">TODAY</str>
<str name="link_t">"""“God loves you more daddy....God loves them more</str>
<long name="_version_">1464787951004155905</long>
</doc>
<doc>
<str name="id">2</str>
<str name="full_message_t">"""Flight #MH370 ended flight in southern Indian Ocean</str>
<str name="source_t"> says @NajibRazak http://t.co/NfesnDrcsP"""</str>
<str name="news_t">TOMORROW</str>
<str name="link_t">"""Flight #MH370 ended flight in southern Indian Ocean</str>
<long name="_version_">1464787951005204483</long>
</doc>
以下SAXParser代码：
public class ReadXMLFile {
public static void main(String[] args) {
//Declaration
final String row[] = new String[5]; //id, full_message_t, source_t, news_t, link_t
final ArrayList<String[]> tableResult = new ArrayList<String[]>(); //Store ArrayList of row[]
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
DefaultHandler handler = new DefaultHandler()
{
//When these are TRUE, extract the ocntent
boolean b_id = false;
boolean b_full_message_t = false;
boolean b_source_t = false;
boolean b_news_t = false;
boolean b_link_t = false;
//############################################################################################
//Look for <start> tags
public void startElement(String uri, String localName,String qName,
Attributes attributes) throws SAXException {
System.out.println("Start Element :" + qName);
//Only interested in <str>
if (qName.equalsIgnoreCase("str")) {
String name = attributes.getValue("name");
//Check for name="id"
if(name.equalsIgnoreCase("id")){
b_id = true;
}
//Check for name="full_message_t"
else if(name.equalsIgnoreCase("full_message_t")){
b_full_message_t = true;
}
else if(name.equalsIgnoreCase("source_t")){
b_source_t = true;
}
else if(name.equalsIgnoreCase("news_t")){
b_news_t= true;
}
else if(name.equalsIgnoreCase("link_t")){
b_link_t = true;
}
}//end if
}//end startElement
//############################################################################################
//Look for <end> tags
public void endElement(String uri, String localName,
String qName) throws SAXException {
System.out.println("End Element :" + qName);
//When reach </doc>, row Array is complete. Add into ArrayList
if (qName.equalsIgnoreCase("doc")) {
System.out.println("Push row into Arraylist : " + row[0]);
tableResult.add(row);
}
}//end endElement
//############################################################################################
//Get the content
public void characters(char ch[], int start, int length) throws SAXException {
if (b_id) {
//System.out.println("id : " + new String(ch, start, length));
row[0] = new String(ch, start, length);
System.out.println("The id is " + row[0]);
b_id = false;
}
else if (b_full_message_t) {
//System.out.println("fullmsg : " + new String(ch, start, length));
row[1] = new String(ch, start, length);
System.out.println("The fullmsg is " + row[1]);
b_full_message_t = false;
}
else if (b_source_t) {
//System.out.println("fullmsg : " + new String(ch, start, length));
row[2] = new String(ch, start, length);
System.out.println("The source is " + row[2]);
b_source_t = false;
}
else if (b_news_t) {
//System.out.println("fullmsg : " + new String(ch, start, length));
row[3] = new String(ch, start, length);
System.out.println("The news is " + row[3]);
b_news_t = false;
}
else if (b_link_t) {
//System.out.println("fullmsg : " + new String(ch, start, length));
row[4] = new String(ch, start, length);
System.out.println("The link is " + row[4]);
b_link_t = false;
}
}//end characters
};//end DefaultHandler
//############################################################################################
//Read the String
//saxParser.parse("solrTest.xml", handler);
File file = new File("solrTest.xml");
InputStream inputStream= new FileInputStream(file);
Reader reader = new InputStreamReader(inputStream,"UTF-8");
InputSource is = new InputSource(reader);
is.setEncoding("UTF-8");
saxParser.parse(is, handler);
} catch (Exception e) {
e.printStackTrace();
}
//Test output Arraylist
System.out.println("Test Result");
System.out.println(tableResult.get(0));
System.out.println(tableResult.get(1));
}
}
在执行结束时，应该有2个String Arrays，它们将被添加到ArrayList中。但是，在打印出地址的最后一行，地址是相同的。 换句话说，最后一个文档存储在ArrayList 两次中。 为什么会这样？第一个医生怎么了？
答案 0 :(得分：2)
您必须在调用
后重新初始化行数组tableResult.add(row);
row = new String[5];
否则它始终具有相同的参考。这意味着您的列表有两个条目，引用同一个数组。