pull解析器: 反序列化与序列化
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了pull解析器: 反序列化与序列化相关的知识，希望对你有一定的参考价值。
pull解析器:反序列化 读取xml文件来获取一个对象的数据
1 import java.io.FileInputStream; 2 import java.io.IOException; 3 import java.util.ArrayList; 4 import java.util.List; 5 6 import org.xmlpull.v1.XmlPullParser; 7 import org.xmlpull.v1.XmlPullParserException; 8 import org.xmlpull.v1.XmlPullParserFactory; 9 10 public class ReadXmlTest { 11 12 /** 13 * pull解析器:反序列化 读取xml文件来获取一个对象的数据 14 * @param args 15 * @throws XmlPullParserException 16 * @throws IOException 17 */ 18 public static void main(String[] args) throws XmlPullParserException, IOException { 19 20 //1.导包 21 //2.获取解析器工厂 22 XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); 23 //3.根据工厂获取解析器对象 24 XmlPullParser parser = factory.newPullParser(); 25 //4.设置输入流 26 parser.setInput(new FileInputStream("src/student.xml"),"utf-8"); 27 //5.解析 28 List<Student> list = null; 29 Student stu = null; 30 //获取对应时间的类型 31 int type = parser.getEventType(); 32 while(type != XmlPullParser.END_DOCUMENT){ 33 //获取标签名称 34 String tagname = parser.getName(); 35 switch(type){ 36 case XmlPullParser.START_TAG: 37 //判断标签名称 38 if("students".equals(tagname)){ 39 //创建集合 40 list = new ArrayList<Student>(); 41 }else if("student".equals(tagname)){ 42 //创建对象 43 stu = new Student(); 44 //获取ID属性值 45 String id = parser.getAttributeValue(0); 46 //赋值 47 stu.setId(id); 48 }else if("name".equals(tagname)){ 49 //获取标签体的文本 50 String name = parser.nextText(); 51 //赋值 52 stu.setName(name); 53 }else if("age".equals(tagname)){ 54 //获取标签体的文本 55 String age = parser.nextText(); 56 //赋值 57 stu.setAge(Integer.parseInt(age)); 58 } 59 break; 60 case XmlPullParser.END_TAG: 61 if("student".equals(tagname)){ 62 //将对象添加到集合中 63 list.add(stu); 64 stu = null; 65 } 66 break; 67 default: 68 break; 69 } 70 //向下走一步 71 parser.next(); 72 //重新赋值 73 type = parser.getEventType(); 74 } 75 //6.输出 76 System.out.println(list); 77 } 78 }
------------------------------------------------------------------------------------------------
pull解析器:序列化 将一个对象的数据 写入到xml文件中
1 import java.io.FileOutputStream; 2 import java.io.IOException; 3 4 import org.xmlpull.v1.XmlPullParserException; 5 import org.xmlpull.v1.XmlPullParserFactory; 6 import org.xmlpull.v1.XmlSerializer; 7 8 public class WriteXmlTest { 9 10 /**pull解析器:序列化 将一个对象的数据 写入到xml文件中 11 * @param args 12 * @throws XmlPullParserException 13 * @throws IOException 14 */ 15 public static void main(String[] args) throws XmlPullParserException, IOException { 16 17 Student stu = new Student("s_001", "小飞飞", 23); 18 //1.导包 19 //2.获取解析器工厂 20 XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); 21 //3.根据工厂获取解析器对象 22 XmlSerializer serializer = factory.newSerializer(); 23 //4.设置输出流 24 serializer.setOutput(new FileOutputStream("src/sss.xml"),"utf-8"); 25 //5.写入 26 //5.1写文档声明 参数1：encoding属性值，参数2：standalone属性值 27 serializer.startDocument("utf-8", true); 28 //5.2写入开始跟标签 29 serializer.startTag(null, "students"); 30 for(int i=0; i <5; i++){ 31 //5.3写入student标签 32 serializer.startTag(null, "student"); 33 34 serializer.attribute(null, "id", stu.getId()); 35 36 serializer.startTag(null, "name"); 37 serializer.text(stu.getName()); 38 serializer.endTag(null, "name"); 39 40 serializer.startTag(null, "age"); 41 serializer.text(String.valueOf(stu.getAge())); 42 serializer.endTag(null, "age"); 43 44 serializer.endTag(null, "student"); 45 } 46 //5.4写入结束标签 47 serializer.endTag(null, "students"); 48 //5.5写入结束文档 49 serializer.endDocument(); 50 //反应结果 51 System.out.println("写入完成,请去查看!"); 52 } 53 }
Student类
1 public class Student { 2 3 private String id; 4 private String name; 5 private int age; 6 7 public Student() { 8 super(); 9 } 10 public Student(String id, String name, int age) { 11 super(); 12 this.id = id; 13 this.name = name; 14 this.age = age; 15 } 16 /** 17 * @return the id 18 */ 19 public String getId() { 20 return id; 21 } 22 /** 23 * @param id the id to set 24 */ 25 public void setId(String id) { 26 this.id = id; 27 } 28 /** 29 * @return the name 30 */ 31 public String getName() { 32 return name; 33 } 34 /** 35 * @param name the name to set 36 */ 37 public void setName(String name) { 38 this.name = name; 39 } 40 /** 41 * @return the age 42 */ 43 public int getAge() { 44 return age; 45 } 46 /** 47 * @param age the age to set 48 */ 49 public void setAge(int age) { 50 this.age = age; 51 } 52 /* (non-Javadoc) 53 * @see java.lang.Object#toString() 54 */ 55 @Override 56 public String toString() { 57 return "Student [id=" + id + ", name=" + name + ", age=" + age + "]"; 58 } 59 60 }
student.xml
1 <?xml version=‘1.0‘ encoding=‘utf-8‘ ?> 2 3 <students> 4 <student id=‘s001‘> 5 <name>zhangsan</name> 6 <age>23</age> 7 </student> 8 9 <student id="s002"> 10 <name>lisi</name> 11 <age>24</age> 12 </student> 13 14 <student id="s003"> 15 <name>王五</name> 16 <age>25</age> 17 </student> 18 19 </students>
导入的包名称(pull解析器jar包):
kxml2-2.3.0.jar
xmlpull_1_1_3_4c.jar
以上是关于pull解析器: 反序列化与序列化的主要内容，如果未能解决你的问题，请参考以下文章