我想将缓存引入到现有的 Spring 项目中,该项目使用 JAXB 来公开 Web 服务。缓存将在端点级别完成。为了做到这一点,使用 JAXB 从 XSD 生成的类需要实现
Serializable
接口并覆盖 Object
的 toString()
方法。
如何指示 xjc 工具使用 XSD 生成具有所需属性的源?
在自定义绑定文件中使用
xjc:serializable
将 java.io.Serializable
接口与 serialVersionUID
一起添加到您的类中:
<?xml version="1.0" encoding="UTF-8"?>
<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xsi:schemaLocation="
http://java.sun.com/xml/ns/jaxb http://java.sun.com/xml/ns/jaxb/bindingschema_2_0.xsd"
version="2.1">
<globalBindings>
<serializable uid="1" />
</globalBindings>
</bindings>
使用一个超类(参见
xjc:superClass
),所有绑定类都将从该超类继承。这个类不会由 xjc 生成,因此您可以随意创建它(这里有一个 toString()
实现):
<?xml version="1.0" encoding="UTF-8"?>
<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xsi:schemaLocation="
http://java.sun.com/xml/ns/jaxb http://java.sun.com/xml/ns/jaxb/bindingschema_2_0.xsd"
version="2.1">
<globalBindings>
<serializable uid="1" />
<xjc:superClass name="the.package.to.my.XmlSuperClass" />
</globalBindings>
</bindings>
这对我有用:
<?xml version="1.0" encoding="UTF-8"?>
<jaxb:bindings xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc" jaxb:version="2.1">
<jaxb:globalBindings>
<xjc:serializable uid="1337"/>
</jaxb:globalBindings>
</jaxb:bindings>
另一种生成
toString()
方法的方法 - JAXB2 Basics Plugins。这种方式看起来更好,因为不使用反射。下面是如何使用 Maven 执行此操作的示例。
<build>
<plugins>
<plugin>
<groupId>org.jvnet.jaxb2.maven2</groupId>
<artifactId>maven-jaxb2-plugin</artifactId>
<version>0.8.2</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<schemaDirectory>
${project.basedir}/src/main/resources
</schemaDirectory>
<generateDirectory>
${project.basedir}/src/main/java
</generateDirectory>
<extension>true</extension>
<args>
<arg>-XtoString</arg>
</args>
<plugins>
<plugin>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-basics</artifactId>
<version>0.6.4</version>
</plugin>
</plugins>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-basics-runtime</artifactId>
<version>0.6.4</version>
</dependency>
</dependencies>
结果你会得到这样的代码。
public String toString() {
final ToStringStrategy strategy = JAXBToStringStrategy.INSTANCE;
final StringBuilder buffer = new StringBuilder();
append(null, buffer, strategy);
return buffer.toString();
}
public StringBuilder append(ObjectLocator locator, StringBuilder buffer, ToStringStrategy strategy) {
strategy.appendStart(locator, this, buffer);
appendFields(locator, buffer, strategy);
strategy.appendEnd(locator, this, buffer);
return buffer;
}
public StringBuilder appendFields(ObjectLocator locator, StringBuilder buffer, ToStringStrategy strategy) {
{
String theName;
theName = this.getName();
strategy.appendField(locator, this, "name", buffer, theName);
}
{
String theBank;
theBank = this.getBank();
strategy.appendField(locator, this, "bank", buffer, theBank);
}
return buffer;
}
我使用这个代码并且对我有用
<?xml version="1.0" encoding="UTF-8"?>
<jaxb:bindings xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc" jaxb:version="2.1">
<jaxb:globalBindings>
<xjc:serializable uid="1"/><!--If you Forgot this line your class did not be serializable--!>
</jaxb:globalBindings>
</jaxb:bindings>
为了获取 Serialized 接口,请将以下绑定信息添加到 xsd 文件中:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" jaxb:version="2.0">
<xs:annotation>
<xs:appinfo>
<jaxb:globalBindings optionalProperty="primitive">
<jaxb:serializable/>
</jaxb:globalBindings>
</xs:appinfo>
</xs:annotation>
<xs:element name="myXsdElement">
.....
</xs:element>
</xs:schema>
这是使用 CXF 3.1.10 的示例。请记住包含编译组:'org.apache.cxf.xjc-utils',名称:'cxf-xjc-runtime',版本:'3.1.0'
<jxb:bindings
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
version="2.1">
<jxb:bindings schemaLocation="META-INF/wsdl/xsd2.xsd">
<jxb:globalBindings xmlns:jxb="http://java.sun.com/xml/ns/jaxb" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<jxb:serializable uid="1"/>
</jxb:globalBindings>
基于 jaxb2-maven-plugin:2.5.0 插件对我的项目有用:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>2.5.0</version>
<executions>
<execution>
...
</execution>
<execution>
<id>schema_variations-scopes</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
...
<xjbSources>
<xjbSource>src/main/resources/xjc/bindings.xjb</xjbSource>
</xjbSources>
</configuration>
</execution>
</executions>
</plugin>
并将绑定.xml文件放置在路径下:
src/main/resources/xjc/bindings.xjb
<jxb:bindings version="1.0"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<jxb:globalBindings generateIsSetMethod="true">
<xjc:serializable uid="12343"/>
</jxb:globalBindings>
</jxb:bindings>