我正在尝试将我的对象序列化为xml文件,问题是该对象的某些实例变量未写入xml文件中。我不知道为什么会忽略它们,以及如何获取序列化方法以将每个变量写入xml文件。我注意到,当我设置(使用设置器)时,这些变量中的一些更可能写入xml文件中。
我要问的是:
1-我想知道为什么某些实例变量在对象序列化时没有写在XML文件中。
2-当我将对象序列化为XML时,如何强制将对象的所有实例变量写入文件。
我的班级
package DBMS;
import JDBC.ResultSetMetaData;
public class Column {
private String colName= "";
private String type="";
private boolean isPrimary= false;
private boolean isAutoIncrement= false;
private int NullableState = ResultSetMetaData.columnNullableUnknown;
private boolean isReadOnly= false;
private boolean isSearchable= true;
private String tableName= "unknown";
private int incrementNextValue = 1;
public Column() {
// TODO Auto-generated constructor stub
}
public Column(String n, String t) {
colName = n;
type=t;
}
public String getTableName() {
return tableName;
}
public void setTableName(String s) {
tableName = s;
}
public String getColName() {
// TODO Auto-generated method stub
return colName;
}
public void setColName(String s) {
// TODO Auto-generated method stub
colName = s;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public boolean isPrimary() {
return isPrimary;
}
public void setPrimary(boolean isPrimary) {
this.isPrimary = isPrimary;
}
public boolean isAutoIncrement() {
return isAutoIncrement;
}
public void setAutoIncrement(boolean isAutoIncrement) {
this.isAutoIncrement = isAutoIncrement;
}
public int getNullableState() {
return NullableState;
}
public void setNullable(int Nullable) {
this.NullableState = Nullable;
}
public boolean isReadOnly() {
return isReadOnly;
}
public void setReadOnly(boolean isReadOnly) {
this.isReadOnly = isReadOnly;
}
public boolean isSearchable() {
return isSearchable;
}
public void setSearchable(boolean isSearchable) {
this.isSearchable = isSearchable;
}
public int getIncrementNextValue() {
return incrementNextValue;
}
public void setIncrementNextValue(int incrementNextValue) {
this.incrementNextValue = incrementNextValue;
}
}
方法序列化
public void serializeObjectToXML(String xmlFileLocation, ArrayList<Column> objectToSerialize) throws Exception {
FileOutputStream os = new FileOutputStream(xmlFileLocation);
XMLEncoder encoder = new XMLEncoder(os);
encoder.writeObject(objectToSerialize);
encoder.close();
os.close();
}
示例xml输出
<?xml version="1.0" encoding="UTF-8"?>
-<java class="java.beans.XMLDecoder" version="1.7.0_07">
-<object class="java.util.ArrayList">
-<void method="add">
-<object class="DBMS.Column">
-<void property="autoIncrement"> <boolean>true</boolean> </void>
-<void property="colName"> <string>ID</string> </void>
-<void property="readOnly"> <boolean>true</boolean> </void>
-<void property="tableName"> <string>testSerialize</string> </void>
-<void property="type"> <string>int</string> </void> </object> </void>
-<void method="add">
-<object class="DBMS.Column">
-<void property="colName"> <string>Name</string> </void>
-<void property="primary"> <boolean>true</boolean> </void>
-<void property="tableName"> <string>testSerialize</string> </void>
-<void property="type"> <string>string</string> </void> </object> </void> -<void method="add">
-<object class="DBMS.Column">
-<void property="colName"> <string>info</string> </void>
-<void property="tableName"> <string>testSerialize</string> </void> -<void property="type"> <string>string</string> </void> </object> </void>
-<void method="add">
-<object class="DBMS.Column">
-<void property="colName"> <string>data</string> </void>
-<void property="tableName"> <string>testSerialize</string> </void>
-<void property="type"> <string>string</string> </void> </object> </void> </object> </java>
两点值得注意:
getNullableState
方法,但是set方法不匹配;您应该将setNullable
重命名为setNullableState
。因此,强制写入属性值的一种方法是确保其值与构造对象时的值不同。
如果要始终为每个属性编写XML,则可能要考虑使用JAXB而不是XMLEncoder。
[XMLEncoder使用JavaBean模式来序列化对象。
这意味着,它查找一组特定的方法名称而不是成员变量,并调用这些方法以将结果值传输到XML文档。
对象无法正确序列化我,文件为空:
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.8.0_241" class="java.beans.XMLDecoder">
<object class="co.uniquindio.address.model.Empresa"/>
</java>
我可能做错了什么?