java - 解析使用 SAX 重复的 xml 嵌套节点

Question

我已经找了好几天了，但我似乎无法解决我的问题。我已经能够解析 xml 文档，但它的子节点在移回到父节点之前会重复。我的解析器似乎正确地迭代了子节点，但我只能看到重复多次的最后一个子节点的结果。

如果父节点包含 5 个子节点，则会打印 5 个节点中最后一个节点的结果 5 次。

我需要“portfolio”和“trade”后面的 xml 标签才能正确解析。最终得到标签前的xml标签与“trade”后的子节点对齐并打印，而不重复“trade”内的最后一个节点

示例值得赞赏谢谢您

import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;




public class MyHandler extends DefaultHandler {
//List to hold trade object
private List<Portfolio> tradeList = null;
private Portfolio trd = null;

//getter method for trade list
public List<Portfolio> getEmpList() {
    return tradeList;
}


boolean bdate = false;
boolean bfirm = false;
boolean bacctId = false;
boolean bUserId = false;
boolean bseg = false;
boolean btradedate = false;
boolean btradetime = false;
boolean bec = false;
boolean bexch = false;
boolean bpfcode = false;
boolean bpftype = false;
boolean bpe = false;
boolean btradeqty = false;
boolean btradeprice = false;
boolean bmore = false;

@Override
public void startElement(String uri, String localName, String qName, Attributes     attributes)
        throws SAXException {

    if (qName.equalsIgnoreCase("portfolio")) {
        trd = new Portfolio();
        //initialize list
        if (tradeList == null)
            tradeList = new ArrayList<>();  
    } else if (qName.equalsIgnoreCase("firm")) {
        bfirm = true;
    } else if (qName.equalsIgnoreCase("acctId")) {
        bacctId = true;
    } else if (qName.equalsIgnoreCase("UserId")) {
        bUserId = true;
    } else if (qName.equalsIgnoreCase("seg")) {
        bseg = true;
    } else if (qName.equalsIgnoreCase("trade")) {

    } else if (qName.equalsIgnoreCase("tradedate")) {
        btradedate = true;
    } else if (qName.equalsIgnoreCase("tradetime")) {
        btradetime = true;
    } else if (qName.equalsIgnoreCase("ec")) {
        bec = true;
    } else if (qName.equalsIgnoreCase("exch")) {
        bexch = true;
    } else if (qName.equalsIgnoreCase("pfcode")) {
        bpfcode = true;
    } else if (qName.equalsIgnoreCase("pftype")) {
        bpftype = true;
    } else if (qName.equalsIgnoreCase("pe")) {
        bpe = true;
    } else if (qName.equalsIgnoreCase("tradeqty")) {
        btradeqty = true;
    } else if (qName.equalsIgnoreCase("tradeprice")) {
        btradeprice = true;
    } 

}


@Override
public void endElement(String uri, String localName, String qName) throws SAXException      {
    if(qName.equalsIgnoreCase("trade")) {
        tradeList.add(trd); 
    } 



}
@Override
public void characters(char ch[], int start, int length) throws SAXException {

    if (bfirm) {
        //age element, set Employee age
        trd.setFirm(new String(ch, start, length));
        bfirm = false;
    } else if (bacctId) {
        trd.setAcctId(new String(ch, start, length));
        bacctId = false;
    } else if (bUserId) {
        trd.setUserId(new String(ch, start, length));
        bUserId = false;
    } else if (bseg) {
        trd.setSeg(new String(ch, start, length));
        bseg = false;
    } else if (btradedate) {
        trd.setTradedate(new String(ch, start, length));
        btradedate = false;
    } else if (btradetime) {
        trd.setTradetime(new String(ch, start, length));
        btradetime = false;
    } else if (bec) {
        trd.setEC(new String(ch, start, length));
        bec = false;
    } else if (bexch) {
        trd.setExch(new String(ch, start, length));
        bexch = false;
    } else if (bpfcode) {
        trd.setPFCode(new String(ch, start, length));
        bpfcode = false;
    } else if (bpftype) {
        trd.setPFType(new String(ch, start, length));
        bpftype = false;
    } else if (bpe) {
        trd.setPE(new String(ch, start, length));
        bpe = false;
    } else if (btradeqty) {
        trd.setTradeQty(new String(ch, start, length));
        btradeqty = false;
    } else if (btradeprice) {
        trd.setTradePrice(new String(ch, start, length));
        btradeprice = false;
       // bmore = false;
    }


}
} 

这是我的 xml 文件的示例

<?xml version="1.0"?>
<XMLFiletoparse>
<created>201311290419</created>
<pointInTime>
    <date>20131129</date>
    <portfolio>
        <firm>999</firm>
        <acctId>1234G5689</acctId>
        <UserId>11AA</UserId>
        <seg>ABC</seg>
        <trade>
            <tradeDate>20131129</tradeDate>
            <tradeTime>08:30:00</tradeTime>
            <ec>ABC</ec>
            <exch>ABC</exch>
            <pfCode>AB</pfCode>
            <pfType>XYZ</pfType>
            <pe>201403</pe>
            <tradeQty>0</tradeQty>
            <tradePrice>1.11111</tradePrice>
        </trade>
        <trade>
            <tradeDate>20131129</tradeDate>
            <tradeTime>08:30:00</tradeTime>
            <ec>ABC</ec>
            <exch>ABC</exch>
            <pfCode>AB</pfCode>
            <pfType>XYZ</pfType>
            <pe>201403</pe>
            <tradeQty>10</tradeQty>
            <tradePrice>2.22222</tradePrice>
        </trade>
        </portfolio>
    <portfolio>
        <firm>888</firm>
        <acctId>454588784KI</acctId>
        <UserId>LMNO3</UserId>
        <seg>ABC</seg>
        <trade>
            <tradeDate>20131129</tradeDate>
            <tradeTime>08:31:08</tradeTime>
            <ec>ABC</ec>
            <exch>ABC</exch>
            <pfCode>AB</pfCode>
            <pfType>XYZ</pfType>
            <pe>201403</pe>
            <tradeQty>6</tradeQty>
            <tradePrice>3.58965</tradePrice>
        </trade>
</portfolio>
  </pointInTime>
</XMLFiletoparse>

这是投资组合类

import java.io.Serializable;
public class Portfolio implements Serializable {
private String date = null;
private String firm = null;
private String acctId = null;
private String UserId = null;
private String seg = null;
private String tradedate = null;
private String tradetime = null;
private String ec = null;
private String exch = null;
private String pfcode = null;
private String pftype = null;
private String pe = null;
private String tradeqty = null;
private String tradeprice = null;

public String getDate() {
    return date;
}
public void setDate(String date) {
    this.date = date;
}
public String getFirm() {
    return firm;
}
public void setFirm(String firm) {
    this.firm = firm;
}
public String getAcctId() {
    return acctId;
}
public void setAcctId(String acctId) {
    this.acctId = acctId;
}
public String getUserId() {
    return UserId;
}
public void setUserId(String UserId) {
    this.UserId = UserId;
}
public String getSeg() {
    return seg;
}
public void setSeg(String seg) {
    this.seg = seg;
}
public String getTradedate() {
    return tradedate;
}
public void setTradedate(String tradedate) {
    this.tradedate = tradedate;
}
public String getTradetime() {
    return tradetime;
}
public void setTradetime(String tradetime) {
    this.tradetime = tradetime;
}
public String getEC() {
    return ec;
}
public void setEC(String ec) {
    this.ec = ec;
}
public String getExch() {
    return exch;
}
public void setExch(String exch) {
    this.exch = exch;
}
public String getPFCode() {
    return pfcode;
}
public void setPFCode(String pfcode) {
    this.pfcode = pfcode;
}
public String getPFType() {
    return pftype;
}
public void setPFType(String pftype) {
    this.pftype = pftype;
}
public String getPE() {
    return pe;
}
public void setPE(String pe) {
    this.pe = pe;
}
public String getTradeQty() {
    return tradeqty;
}
public void setTradeQty(String tradeqty) {
    this.tradeqty = tradeqty;
}
public String getTradePrice() {
    return tradeprice;
}
public void setTradePrice(String tradeprice) {
    this.tradeprice = tradeprice;
}

@Override
public String toString() {
    return "Date: " + this.date + " Firm: " + this.firm + " Acct ID: " + this.acctId + " User ID: " + this.UserId +
            " Seg: " + this.seg + " tradedate: " + this.tradedate + " tradetime: " + this.tradetime +
            " EC: " +this.ec+ " Exch: " +this.exch+ " PFCode: " +this.pfcode+ " PFType: " +this.pftype+
            " PE: " + this.pe + " Trade Qty: " + tradeqty + " Trade Price: " + tradeprice;
}

Answer 1

如果portfolio中有多个trade节点，您只能看到最后一个子节点结果，因为您在遇到portfolio标签后初始化trd，并且它似乎只能存储有关1个trade的信息。因此，当有 2 个或更多 trade 标签时，相同的 portfolio 对象会被修改。现在，由于 Java 在后台使用引用调用，因此您在列表中添加的对象也会更新为 trd 并且列表中的对象指向相同的内存区域。
您的问题可能有两种解决方案:
1. 修改Portfolio类以存储多于1个trade数据。 (这应该是基于你的XML结构的实现)
2. 将行 trd = new Portfolio() 移至 else if (qName.equalsIgnoreCase("trade"))

内