Xml parsing toolkit Xstream Sample code

Simplified API; non- ing file; high performance, low memory usage; neat XML; no need to modify objects, support for internal private fields; no need for settergetter method, final field; provide serialization interface; custom conversion type policy; detailed error diagnosis;

Features

1. Simplified API;

2. No ing file;

3. High performance, low memory usage;

4. Neat XML;

5. Objects do not need to be modified. internal private fields are supported;

6. The setter/getter method and final field are not required;

7. Provides serialization interfaces;

8. Custom conversion type policy;

9. Detailed error diagnosis;

Common Annotations of Xstream

@ XStreamAlias ("message") alias annotation, target: Class, field

@ XStreamImplicit implicit set

@ XStreamImplicit (itemFieldName = "part") target: set field

@ XStreamConverter (SingleValueCalendarConverter. class) injects the converter to target: Object

@ XStreamAsAttribute convert to attribute. purpose: Field

@ XStreamOmitField ignore the field. purpose: Field

Example

1. parse the XML tool class

Import com. thoughtworks. xstream. XStream; import com. thoughtworks. xstream. io. xml. domDriver; import org. slf4j. logger; import org. slf4j. loggerFactory; import java. io. *;/*** tool class for outputting xml and parsing xml */public class XmlUtil {private static final Logger logger = LoggerFactory. getLogger (XmlUtil. class);/*** convert java to xml * @ param obj object instance * @ return String xml String * @ Title: toXml * @ Description: TODO */public static String toXml (Object obj) {// XStream xstream = new XStream (); // the xpp parser is used by default. // specify the encoding parser XStream xstream = new XStream (new DomDriver ("UTF-8"); // enable annotation recognition xstream. processAnnotations (obj. getClass (); return xstream. toXML (obj );} /*** convert the incoming xml text into a Java object * @ param xmlStr * @ param cls the class corresponding to xml * @ return T the instance object of the class corresponding to xml */public static
 
  
T toBean (String xmlStr, Class
  
   
Cls) {XStream xstream = new XStream (); xstream. processAnnotations (cls); T obj = (T) xstream. fromXML (xmlStr); return obj ;} /*** write it to the xml file * @ param obj Object * @ param absPath absolute path * @ param fileName File Name */public static boolean toXMLFile (Object obj, String absPath, string fileName) {String strXml = toXml (obj); String filePath = absPath + fileName; File file = new File (filePath); if (! File. exists () {try {file. createNewFile ();} catch (IOException e) {logger. error ("file creation failed, cause is {}", e); return false ;}} OutputStream ous = null; try {ous = new FileOutputStream (file); ous. write (strXml. getBytes (); ous. flush ();} catch (Exception e1) {logger. error ("file write failed, cause is {}", e1); return false;} finally {if (ous! = Null) try {ous. close ();} catch (IOException e) {e. printStackTrace () ;}} return true;}/*** READ the packet from the xml file * @ param absPath absolute path * @ param fileName File Name * @ param cls */public static
   
    
T toBeanFromFile (String absPath, String fileName, Class
    
     
Cls) throws Exception {String filePath = absPath + fileName; InputStream ins = null; try {ins = new FileInputStream (new File (filePath);} catch (Exception e) {throw new Exception ("read {" + filePath + "} file failed! ", E);} XStream xstream = new XStream (); xstream. processAnnotations (cls); T obj = null; try {obj = (T) xstream. fromXML (ins);} catch (Exception e) {throw new Exception ("parse {" + filePath + "} file failed! ", E) ;}if (ins! = Null) ins. close (); return obj ;}}
    
   
  
 

2. Compile the Teacher class

import com.thoughtworks.xstream.annotations.XStreamAlias;import com.thoughtworks.xstream.annotations.XStreamAsAttribute;import com.thoughtworks.xstream.annotations.XStreamImplicit;import java.util.List;@XStreamAlias(value = "teacher")public class Teacher {    @XStreamAsAttribute    private String name;    @XStreamAsAttribute    private String phone;    @XStreamAsAttribute    private int age;    @XStreamImplicit(itemFieldName = "student")    private List
 
   students;    public Teacher() {    }    public Teacher(String name, String phone, int age, List
  
    students) {        this.name = name;        this.phone = phone;        this.age = age;        this.students = students;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPhone() {        return phone;    }    public void setPhone(String phone) {        this.phone = phone;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public List
   
     getStudents() {        return students;    }    public void setStudents(List
    
      students) {        this.students = students;    }}
    
   
  
 

3. Compile the Student class

import com.thoughtworks.xstream.annotations.XStreamAlias;import com.thoughtworks.xstream.annotations.XStreamAsAttribute;@XStreamAlias(value = "student")public class Student {    @XStreamAsAttribute    private String name;    @XStreamAsAttribute    private int age;    @XStreamAsAttribute    private String address;    public Student() {    }    public Student(String name, int age, String address) {        this.name = name;        this.age = age;        this.address = address;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }}

4. Test class

Import java. util. arrayList; import java. util. list; public class Test {public static void main (String [] args) {Student student1 = new Student ("Aaron", 24, "Guangzhou "); student student2 = new Student ("Abel", 23, "Beijing"); List
 
  
Students = new ArrayList <> (); students. add (student1); students. add (student2); Teacher teacher = new Teacher ("Dave", "020-123456", 46, students); String xml = XmlUtil. toXml (teacher); System. out. println (xml );}}
 

5. running result

The above is a detailed explanation of the Xstream sample code in the xml parsing toolkit. For more information, see other related articles in the first PHP community!