特点
简化的api;
无映射文件;
高性能,低内存占用;
整洁的xml;
不需要修改对象，支持内部私有字段；
不需要setter/getter方法,final字段;
提供序列化接口;
自定义转换类型策略;
详细的错误诊断;
xstream常用注解
@xstreamalias(message) 别名注解，作用目标：类，字段
@xstreamimplicit 隐式集合
@xstreamimplicit(itemfieldname=part) 作用目标：集合字段
@xstreamconverter(singlevaluecalendarconverter.class) 注入转换器，作用目标： 对象
@xstreamasattribute 转换成属性，作用目标：字段
@xstreamomitfield 忽略字段，作用目标：字段
示例
1. 解析xml工具类
import com.thoughtworks.xstream.xstream;
import com.thoughtworks.xstream.io.xml.domdriver;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import java.io.*;
/**
* 输出xml和解析xml的工具类
*/
public class xmlutil {
private static final logger logger = loggerfactory.
getlogger(xmlutil.class);
/**
* java 转换成xml
* @param obj 对象实例
* @return string xml字符串
* @title: toxml
* @description: todo
*/
public static string toxml(object obj) {
//xstream xstream=new xstream(); //默认使用xpp解析器
//指定编码解析器
xstream xstream = new xstream(new domdriver("utf-8"));
//启用注解识别
xstream.processannotations(obj.getclass());
return xstream.toxml(obj);
}
/**
* 将传入xml文本转换成java对象
* @param xmlstr
* @param cls xml对应的class类
* @return t xml对应的class类的实例对象
*/
public static <t> t tobean(string xmlstr, class<t> cls) {
xstream xstream = new xstream();
xstream.processannotations(cls);
t obj = (t) xstream.fromxml(xmlstr);
return obj;
}
/**
* 写到xml文件中去
* @param obj 对象
* @param abspath 绝对路径
* @param filename 文件名
*/
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;
}
/**
* 从xml文件读取报文
* @param abspath 绝对路径
* @param filename 文件名
* @param cls
*/
public static <t> t tobeanfromfile(string abspath, string filename, class<t> 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. 编写teacher类
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<student> students;
public teacher() {
}
public teacher(string name, string phone, int age, list<student> 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<student> getstudents() {
return students;
}
public void setstudents(list<student> students) {
this.students = students;
}
}
3. 编写student类
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测试类
import java.util.arraylist;
import java.util.list;
public class test {
public static void main(string[] args) {
student student1 = new student("aaron", 24, "广州");
student student2 = new student("abel", 23, "北京");
list<student> 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. 运行结果
<teacher name="dave" phone="020-123456" age="46">
<student name="aaron" age="24" address="广州"/>
<student name="abel" age="23" address="北京"/>
</teacher>
以上就是xml解析工具包 xstream的示例代码详解的详细内容。