org.mybatis.generator.plugins.SerializablePlugin
在generatorConfig.xml中加上配置:
- <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
<plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
運行MBG，生成Userinfo類，我們發現和不加SerializablePlugin插件之前生成的類相比較區別如下：
- public class Userinfo implements Serializable {
- ......
- private static final long serialVersionUID = 1L;
- ......
- }
public class Userinfo implements Serializable {
......
private static final long serialVersionUID = 1L;
......
}
區別1：實現了Serializable接口
區別2：增加了private static final long serialVersionUID = 1L;
下面我們看SerializablePlugin的代碼：
1.
- public class SerializablePlugin extends PluginAdapter
public class SerializablePlugin extends PluginAdapter
繼承PluginAdapter;
2.
- private FullyQualifiedJavaType serializable;
- private FullyQualifiedJavaType gwtSerializable;
- private boolean addGWTInterface;
- private boolean suppressJavaInterface;
-
- public SerializablePlugin() {
- super();
- serializable = new FullyQualifiedJavaType("java.io.Serializable");
- gwtSerializable = new FullyQualifiedJavaType("com.google.gwt.user.client.rpc.IsSerializable");
- }
private FullyQualifiedJavaType serializable; //對應java.io.Serializable的java類型
private FullyQualifiedJavaType gwtSerializable; //對應com.google.gwt.user.client.rpc.IsSerializable的java類型
private boolean addGWTInterface; //是否實現com.google.gwt.user.client.rpc.IsSerializable接口
private boolean suppressJavaInterface; //是否實現java.io.Serializable接口
public SerializablePlugin() {
super();
serializable = new FullyQualifiedJavaType("java.io.Serializable"); //$NON-NLS-1$ 實例化
gwtSerializable = new FullyQualifiedJavaType("com.google.gwt.user.client.rpc.IsSerializable"); //$NON-NLS-1$ 實例化
}
成員變量和構造方法，詳細看代碼注釋。
3.
- public boolean validate(List<String> warnings) {
-
- return true;
- }
public boolean validate(List<String> warnings) {
// this plugin is always valid
return true;
}</pre>不需要參數，所以直接返回true
4.
- @Override
- public void setProperties(Properties properties) {
- super.setProperties(properties);
- addGWTInterface = Boolean.valueOf(properties.getProperty("addGWTInterface"));
- suppressJavaInterface = Boolean.valueOf(properties.getProperty("suppressJavaInterface"));
- }
@Override
public void setProperties(Properties properties) {
super.setProperties(properties);
addGWTInterface = Boolean.valueOf(properties.getProperty("addGWTInterface")); //$NON-NLS-1$
suppressJavaInterface = Boolean.valueOf(properties.getProperty("suppressJavaInterface")); //$NON-NLS-1$
}</pre>獲取addGWTInterface 和 suppressJavaInterface參數，給成員變量賦值。
5.
- @Override
- public boolean modelBaseRecordClassGenerated(TopLevelClass topLevelClass,
- IntrospectedTable introspectedTable) {
- makeSerializable(topLevelClass, introspectedTable);
- return true;
- }
@Override
public boolean modelBaseRecordClassGenerated(TopLevelClass topLevelClass,
IntrospectedTable introspectedTable) {
makeSerializable(topLevelClass, introspectedTable);
return true;
}</pre>調用了makeSerializable方法給BaeRecordClass添加序列化接口
6.
- @Override
- public boolean modelPrimaryKeyClassGenerated(TopLevelClass topLevelClass,
- IntrospectedTable introspectedTable) {
- makeSerializable(topLevelClass, introspectedTable);
- return true;
- }
@Override
public boolean modelPrimaryKeyClassGenerated(TopLevelClass topLevelClass,
IntrospectedTable introspectedTable) {
makeSerializable(topLevelClass, introspectedTable);
return true;
}</pre><pre style="background-color:rgb(255,255,255);font-family:'宋體';">調用了makeSerializable方法給PrimaryKeyClass添加序列化接口
7.
- @Override
- public boolean modelRecordWithBLOBsClassGenerated(
- TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
- makeSerializable(topLevelClass, introspectedTable);
- return true;
- }
@Override
public boolean modelRecordWithBLOBsClassGenerated(
TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
makeSerializable(topLevelClass, introspectedTable);
return true;
}調用了makeSerializable方法給RecordWithBLOBsClass添加序列化接口
8.接下來看看具體的實現方法
- protected void makeSerializable(TopLevelClass topLevelClass,
- IntrospectedTable introspectedTable) {
- if (addGWTInterface) {
- topLevelClass.addImportedType(gwtSerializable);
- topLevelClass.addSuperInterface(gwtSerializable);
- }
-
- if (!suppressJavaInterface) {
- topLevelClass.addImportedType(serializable);
- topLevelClass.addSuperInterface(serializable);
-
-
-
- Field field = new Field();
- field.setFinal(true);
- field.setInitializationString("1L");
- field.setName("serialVersionUID");
- field.setStatic(true);
- field.setType(new FullyQualifiedJavaType("long"));
- field.setVisibility(JavaVisibility.PRIVATE);
- context.getCommentGenerator().addFieldComment(field, introspectedTable);
- n style="white-space:pre;"> </span>
-
- topLevelClass.addField(field);
- }
- }
protected void makeSerializable(TopLevelClass topLevelClass,
IntrospectedTable introspectedTable) {
if (addGWTInterface) { //是否要實現com.google.gwt.user.client.rpc.IsSerializable接口
topLevelClass.addImportedType(gwtSerializable); //import com.google.gwt.user.client.rpc.IsSerializable;
topLevelClass.addSuperInterface(gwtSerializable);//實現接口
}
if (!suppressJavaInterface) { //不禁止實現java.io.Serializable
topLevelClass.addImportedType(serializable); //import java.io.Serializable;
topLevelClass.addSuperInterface(serializable); //實現java.io.Serializable接口
//添加serialVersionUID字段
//最終生成代碼private static final long serialVersionUID = 1L;
Field field = new Field();
field.setFinal(true); //添加final修飾
field.setInitializationString("1L"); //$NON-NLS-1$ 賦值為1L
field.setName("serialVersionUID"); //$NON-NLS-1$ 設置字段名稱為serialVersionUID
field.setStatic(true); //添加static關鍵字
field.setType(new FullyQualifiedJavaType("long")); //$NON-NLS-1$ 聲明類型
field.setVisibility(JavaVisibility.PRIVATE); //聲明為私有
context.getCommentGenerator().addFieldComment(field, introspectedTable); //生成注解
//把拼裝好的方法DOM添加到topLevelClass中，完成接口的實現和字段的添加
topLevelClass.addField(field);
}
}
</div>
