参考了些资料：
在没有任何设置默认情况下，
java到xml的映射，
是java成员名对应xml的元素名，
java类的全名对应xml根元素的名字，
而实际中，往往是xml和java类都有了，要完成相互转换，必须进行别名映射。
别名配置包含三种情况：
1、类别名，用alias(String name, Class type)。
2、类成员别名，用aliasField(String alias, Class definedIn, String fieldName)
3、类成员作为属性别名，用 aliasAttribute(Class definedIn, String attributeName, String alias)，单独命名没有意义，
还要通过useAttributeFor(Class definedIn, String fieldName) 应用到某个类上。
addImplicitCollection(Class ownerType, String fieldName)，去掉集合类型生成xml的父节点。
一、建实体类
//设置类的别名
@XStreamAlias("person")
public class Person {
//将name设置为XML person 元素的 attribute
// @XStreamAsAttribute()
// @XStreamAlias("username")
private String name;
private int age;
//将此字段名在XML中去掉
// @XStreamImplicit()
private List<Address> addressList = new ArrayList<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 List<Address> getAddressList() {
return addressList;
}
public void setAddressList(List<Address> addressList) {
this.addressList = addressList;
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", addressList="
+ addressList + "]";
}
}
@XStreamAlias("address")
public class Address {
private String street;
private int houseNo;
public Address() {
super();
}
public Address(String street, int houseNo) {
super();
this.street = street;
this.houseNo = houseNo;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public int getHouseNo() {
return houseNo;
}
public void setHouseNo(int houseNo) {
this.houseNo = houseNo;
}
@Override
public String toString() {
return "Address [street=" + street + ", houseNo=" + houseNo + "]";
}
}
二、测试
package com.demo.stream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import com.thoughtworks.xstream.XStream;
/*
* 使用的jar包：
* xmlpull-1.1.3.1.jar
* xpp3_min-1.1.4c.jar
* xstream-1.4.8.jar
*
* 个人建议：使用注解
*
* 这样进行相互转换时就很方便了，不用手写过多的配置
*/
public class StreamDemo {
//跟生成xml的设置保持一致就可以了
public static void xmlToBean(String xml) {
XStream xStream=new XStream();
// stream.alias("person1", Person.class);//注解已经配置,不需要
// stream.alias("address1", Address.class);
// xStream.aliasField("username", Person.class, "name");
xStream.addImplicitCollection(Person.class, "addressList");
xStream.setMode(XStream.NO_REFERENCES);
// xs.useAttributeFor(Person.class, "name");
xStream.addImplicitCollection(Person.class, "addressList");
xStream.processAnnotations(new Class[]{Person.class,Address.class});
Person person = (Person)xStream.fromXML(xml);
System.out.println(person);
}
public static void xmlToBean(File xmlFile) {
XStream xStream=new XStream();
// stream.alias("person1", Person.class);//注解已经配置,不需要
// stream.alias("address1", Address.class);
// xStream.aliasField("username", Person.class, "name");
xStream.addImplicitCollection(Person.class, "addressList");
xStream.setMode(XStream.NO_REFERENCES);
// xs.useAttributeFor(Person.class, "name");
xStream.addImplicitCollection(Person.class, "addressList");
xStream.processAnnotations(new Class[]{Person.class,Address.class});
Person person = (Person)xStream.fromXML(xmlFile);
System.out.println(person);
}
private static String beanToXml() throws FileNotFoundException {
Person person=new Person();
person.setName("张三");
person.setAge(23);
List<Address> list=new ArrayList<Address>();
list.add(new Address("临沂路8弄", 1801));
list.add(new Address("漕河", 1900));
person.setAddressList(list);
XStream stream=new XStream();
//设置别名，如果注解已经设置了,此时在这里的设置别名将无效
//如果没有注解配置，那么这里的设置别名将有效啦
//如果都不设置，默认是全类名，比如com.demo.stream.Address
// stream.alias("person1", Person.class);
// stream.alias("address1", Address.class);
//还可以设置字段的别名
// stream.aliasField("username", Person.class, "name");
//不引用，意思大概就是不生成ID属性
stream.setMode(XStream.NO_REFERENCES);
//会自动给person加个id属性
// stream.setMode(XStream.ID_REFERENCES);
//去掉集合类型生成xml的父节点
//作用等同注解：@XStreamImplicit()
stream.addImplicitCollection(Person.class, "addressList");
//将name字段作为Person的属性
//作用等同注解@XStreamAsAttribute()
// stream.useAttributeFor(Person.class, "name");
// 注册使用了注解的Person类
stream.processAnnotations(new Class[]{Person.class,Address.class});
//转换为xml（默认格式化）
String xml=stream.toXML(person);
System.out.println(xml);
return xml;
}
//将xml字符串写进文件
private static void creatXMlFile(File file) throws IOException {
String xml=beanToXml();
String xmlContent="<?xml version=\"1.0\" encoding=\"GBK\"?>\n";
if (!file.exists()) {
file.getParentFile().mkdirs();
// file.createNewFile();
}
xmlContent+=xml;
//可以将xml字符串写入文件,要创建新文件，必须保证其父路径存在哦,单级目录自动创建文件
PrintWriter pw=new PrintWriter(file);
pw.write(xmlContent);
pw.close();
//如果要实现追加
// BufferedWriter bw=new BufferedWriter(new FileWriter(file ,true));
//那么此时必须保证xml头部申明只能一次
/* if (file.length()==0) {
xmlContent+=xml;
}else{
xmlContent=xml;
}*/
}
public static void main(String[] args) throws IOException {
// String xml= beanToXml();
File file=new File("D:/测试数据xml/1/test.xml");
// creatXMlFile(file);
// xmlToBean(xml);
//读取xml时，会自动寻找对应字段，跟顺序没有关系
xmlToBean(file);
}
}
3.附加方法，将xml变成一行输出（webservcie测试可以用到）
public static String oneLine(File file) throws FileNotFoundException {
if (!file.exists()) {
System.err.println("源文件不存在！");
throw new RuntimeException();
}
Scanner in=new Scanner(file);
StringBuilder builder=new StringBuilder("");
while(in.hasNext()){
builder.append(in.nextLine().trim());
}
System.out.println(builder.toString());
return builder.toString();
}
时间： 2024-10-25 17:57:03