安卓:SAX解析返回空值和检索值同名
的标签我有这些XML在URL安卓:SAX解析返回空值和检索值同名
<?xml version="1.0" encoding="ISO-8859-1" ?>
<Phonebook>
<PhonebookEntry>
<firstname>John</firstname>
<lastname>Connor</lastname>
<Address>5,Downing Street</Address>
<Phone loc="home">9875674567</Phone>
<Phone loc="work">9875674567</Phone>
<Phone loc="mobile">78654562341</Phone>
</PhonebookEntry>
<PhonebookEntry>
<firstname>John</firstname>
<lastname>Smith</lastname>
<Address>6,Downing Street</Address>
<Phone loc="home">678-56-home</Phone>
<Phone loc="work">678-59-work</Phone>
<Phone loc="mobile">678-85-mobile</Phone>
</PhonebookEntry>
</Phonebook>
当谈到我能够提取的名字,姓氏和地址的值,但到电话标签,我的代码返回空值。这里是我的代码:
ParsingXML.java
package com.example.parsingxml;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class ParsingXML extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
//System.setProperty("http.proxyHost"," 129.188.69.100 ");
//System.setProperty("http.proxyPort","1080");
//System.setProperty("http.nonProxyHosts","10.228.97.76");
/* Create a new TextView to display the parsingresult later. */
TextView tv = new TextView(this);
try {
/* Create a URL we want to load some xml-data from. */
URL url = new URL("http://somedomain.com/jm/sampleXML.xml");
URLConnection ucon = url.openConnection();
/* Get a SAXParser from the SAXPArserFactory. */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
/* Get the XMLReader of the SAXParser we created. */
XMLReader xr = sp.getXMLReader();
/* Create a new ContentHandler and apply it to the XML-Reader*/
ExampleHandler myExampleHandler = new ExampleHandler();
xr.setContentHandler(myExampleHandler);
/* Parse the xml-data from our URL. */
xr.parse(new InputSource(url.openStream()));
/* Parsing has finished. */
/* Our ExampleHandler now provides the parsed data to us. */
ParsedExampleDataSet parsedExampleDataSet =
myExampleHandler.getParsedData();
/* Set the result to be displayed in our GUI. */
tv.setText(parsedExampleDataSet.toString());
} catch (Exception e) {
/* Display any Error to the GUI. */
tv.setText("Error: " + e.getMessage());
}
/* Display the TextView. */
this.setContentView(tv);
}
}
ExampleHandler.java
package com.example.parsingxml;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class ExampleHandler extends DefaultHandler{
// ===========================================================
// Fields
// ===========================================================
private boolean in_outertag = false;
private boolean in_innertag = false;
private boolean in_firstname = false;
private boolean in_lastname= false;
private boolean in_Address=false;
private boolean in_Phone=false;
private boolean in_homePhone=false;
private boolean in_workPhone=false;
private boolean in_mobilePhone=false;
private ParsedExampleDataSet myParsedExampleDataSet = new ParsedExampleDataSet();
// ===========================================================
// Getter & Setter
// ===========================================================
public ParsedExampleDataSet getParsedData() {
return this.myParsedExampleDataSet;
}
// ===========================================================
// Methods
// ===========================================================
@Override
public void startDocument() throws SAXException {
this.myParsedExampleDataSet = new ParsedExampleDataSet();
}
@Override
public void endDocument() throws SAXException {
// Nothing to do
}
/** Gets be called on opening tags like:
* <tag>
* Can provide attribute(s), when xml was like:
* <tag attribute="attributeValue">*/
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException {
if (localName.equals("PhoneBook")) {
this.in_outertag = true;
}else if (localName.equals("PhonebookEntry")) {
this.in_innertag = true;
}else if (localName.equals("firstname")) {
this.in_firstname = true;
}else if (localName.equals("lastname")) {
this.in_lastname= true;
}else if(localName.equals("Address")) {
this.in_Address= true;
}else if (localName.equals("Phone")){
this.in_Phone=true;
String phoneattr=atts.getValue("loc");
if(phoneattr.equals("home")){
this.in_homePhone=true;
}else if(phoneattr.equals("work")){
this.in_workPhone=true;
}else if(phoneattr.equals("mobile")){
this.in_mobilePhone=true;
}
}
}
//else if (localName.equals("tagwithnumber")) {
// }
// Extract an Attribute
// String attrValue = atts.getValue("thenumber");
// int i = Integer.parseInt(attrValue);
// myParsedExampleDataSet.setExtractedInt(i);
// }
/** Gets be called on closing tags like:
* </tag> */
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
if (localName.equals("Phonebook")) {
this.in_outertag = false;
}else if (localName.equals("PhonebookEntry")) {
this.in_innertag = false;
}else if (localName.equals("firstname")) {
this.in_firstname = false;
}else if (localName.equals("lastname")) {
this.in_lastname= false;
}else if(localName.equals("Address")) {
this.in_Address= false;
}else if(localName.equals("Phone")) {
this.in_Phone=false;
}
}
/** Gets be called on the following structure:
* <tag>characters</tag> */
@Override
public void characters(char ch[], int start, int length) {
if(this.in_firstname){
myParsedExampleDataSet.setfirstname(new String(ch, start, length));
}
if(this.in_lastname){
myParsedExampleDataSet.setlastname(new String(ch, start, length));
}
if(this.in_Address){
myParsedExampleDataSet.setAddress(new String(ch, start, length));
}
if(this.in_homePhone){
myParsedExampleDataSet.sethomePhone(new String(ch, start, length));
}
if(this.in_workPhone){
myParsedExampleDataSet.setworkPhone(new String(ch, start, length));
}
if(this.in_mobilePhone){
myParsedExampleDataSet.setmobilePhone(new String(ch, start, length));
}
}
}
ParsedExampleDataSet.java
package com.example.parsingxml;
public class ParsedExampleDataSet {
private String firstname = null;
private String lastname=null;
private String Address=null;
private String Phone=null;
private String homephone=null;
private String workphone=null;
private String mobilephone=null;
//Firstname
public String getfirstname() {
return firstname;
}
public void setfirstname(String firstname) {
this.firstname = firstname;
}
//Lastname
public String getlastname(){
return lastname;
}
public void setlastname(String lastname){
this.lastname=lastname;
}
//Address
public String getAddress(){
return Address;
}
public void setAddress(String Address){
this.Address=Address;
}
//Phone
public String getPhone(){
return Phone;
}
public void sethomePhone(String homePhone){
this.homephone=homePhone;
}
public void setworkPhone(String homePhone){
this.homephone=homePhone;
}
public void setmobilePhone(String homePhone){
this.homephone=homePhone;
}
public String toString(){
return "firstname: " + this.firstname + "\n" + "lastname=: " + this.lastname + "\n" + "Address: " + this.Address+ "\n" + "homephone: " + this.homephone + "\n" + "workphone: " + this.workphone + "\n" + "mobilephone: " + this.mobilephone;
}
}
另一件事我该如何检索PhonebookEntry标记中的两个值?
我有点新来java和android开发,非常感谢提前! :)
此代码使得不正确的假设characters
方法将在startElement
和endElement
调用标记之间调用一次。
而不必在characters
方法设置值的逻辑,你需要在startElement
方法初始化一个缓冲区,收集字符转换成在characters
法进行缓冲,然后进行分配和清除缓冲区中endElement
方法。
编辑:
其实,有你的代码的一些其他问题...
你有setMobilePhone和setWorkPhone在模型类设置HOMEPHONE场......一个必然的风险时,你复制 - 修改代码。
而你的处理程序只创建一个结果,并且会覆盖并只返回文件中的最后一个结果。
我玩过它,将一些方法更改为Java标准命名,并将一些xml更改为CamelCase。
修改后的XML:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<PhoneBook>
<PhoneBookEntry>
<FirstName>John</FirstName>
<LastName>Connor</LastName>
<Address>5,Downing Street</Address>
<Phone loc="home">9875674567</Phone>
<Phone loc="work">9875674567</Phone>
<Phone loc="mobile">78654562341</Phone>
</PhoneBookEntry>
<PhoneBookEntry>
<FirstName>John</FirstName>
<LastName>Smith</LastName>
<Address>6,Downing Street</Address>
<Phone loc="home">678-56-home</Phone>
<Phone loc="work">678-59-work</Phone>
<Phone loc="mobile">678-85-mobile</Phone>
</PhoneBookEntry>
</PhoneBook>
修订ParsedExampleDataSet:
public class ParsedExampleDataSet {
private String firstName = null;
private String lastName =null;
private String address =null;
private String homePhone =null;
private String workPhone =null;
private String mobilePhone =null;
//Firstname
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
//Lastname
public String getLastName(){
return lastName;
}
public void setLastName(String lastName){
this.lastName = lastName;
}
//address
public String getAddress(){
return address;
}
public void setAddress(String Address){
this.address =Address;
}
public void setHomePhone(String homePhone){
this.homePhone =homePhone;
}
public void setWorkPhone(String homePhone){
this.workPhone =homePhone;
}
public void setMobilePhone(String homePhone){
this.mobilePhone =homePhone;
}
public String toString(){
return "firstName: " + this.firstName + "\n" + "lastName=: " + this.lastName + "\n" + "address: " + this.address + "\n" + "homePhone: " + this.homePhone + "\n" + "workPhone: " + this.workPhone + "\n" + "mobilePhone: " + this.mobilePhone;
}
}
这确实解析处理程序:
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import java.util.ArrayList;
import java.util.List;
public class ExampleHandler extends DefaultHandler {
// ===========================================================
// Fields
// ===========================================================
private boolean in_homePhone = false;
private boolean in_workPhone = false;
private boolean in_mobilePhone = false;
private StringBuffer stringBuffer;
private List<ParsedExampleDataSet> myParsedExampleDataSets;
private ParsedExampleDataSet myParsedExampleDataSet;
// ===========================================================
// Methods
// ===========================================================
public List<ParsedExampleDataSet> getParsedData() {
return myParsedExampleDataSets;
}
@Override
public void startDocument() throws SAXException {
myParsedExampleDataSets = new ArrayList<ParsedExampleDataSet>();
stringBuffer = new StringBuffer();
}
@Override
public void endDocument() throws SAXException {
// Nothing to do
}
/**
* Gets be called on opening tags like:
* <tag>
* Can provide attribute(s), when xml was like:
* <tag attribute="attributeValue">
*/
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException {
if (qName.equals("PhoneBookEntry")) {
myParsedExampleDataSet = new ParsedExampleDataSet();
}
if (qName.equals("Phone")) {
String phoneLocation = atts.getValue("loc");
if (phoneLocation.equals("home")) {
this.in_homePhone = true;
} else if (phoneLocation.equals("work")) {
this.in_workPhone = true;
} else if (phoneLocation.equals("mobile")) {
this.in_mobilePhone = true;
}
}
}
/**
* Gets be called on closing tags like:
* </tag>
*/
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
String result = stringBuffer.toString();
stringBuffer.setLength(0);
if (in_homePhone) {
myParsedExampleDataSet.setHomePhone(result);
in_homePhone = false;
}
else if (in_mobilePhone) {
myParsedExampleDataSet.setMobilePhone(result);
in_mobilePhone = false;
}
else if (in_workPhone) {
myParsedExampleDataSet.setWorkPhone(result);
in_workPhone = false;
}
else if (qName.equals("FirstName")) {
myParsedExampleDataSet.setFirstName(result);
}
else if (qName.equals("LastName")) {
myParsedExampleDataSet.setLastName(result);
}
else if (qName.equals("Address")) {
myParsedExampleDataSet.setAddress(result);
}
else if (qName.equals("PhoneBookEntry")) {
myParsedExampleDataSets.add(myParsedExampleDataSet);
}
}
/**
* Gets be called on the following structure:
* <tag>characters</tag>
*/
@Override
public void characters(char ch[], int start, int length) {
stringBuffer.append(new String(ch, start, length));
}
}
它把一些可能不需要的空白的领域,但我怀疑你可以弄清楚如何修剪。
调用它,你会得到一个列表,而不是一个单一的对象,但除了处理这个,你的调用代码不应该改变太多。我没有尝试去处理这个问题,因为我在android上没有这样做。
此外,要从元素中获取属性,您可以使用如下所示: 您可以从startElement方法中的atts Attributes中获取属性。
}else if (localName.equals("Phone")){
this.in_Phone=true;
int length = atts.getLength();
System.out.println("length = " + length);
for(int i = 0; i < length; i++){
String name = atts.getQName(i);
System.out.println(name);
String value = atts.getValue(i);
System.out.println(value);
if(name.equals("loc")){
if(value.equals("home")){
this.in_homePhone=true;
}else if(value.equals("work")){
this.in_workPhone=true;
}else if(value.equals("mobile")){
this.in_mobilePhone=true;
}
}
}
}
感谢您的回复!你的意思是我要设置startElement方法的值?嗯,你有它的示例代码? – Kris 2011-05-18 07:43:13
嗨,唐,谢谢你的回应!你有它的示例代码? – Kris 2011-05-18 07:42:01
你做了我的一天,谢谢。 – RobinHood 2014-11-03 07:22:38