Spring MVC 学习笔记 十三 xml格式输入输出

Xml格式输入
   Spring mvc中缺省提供了SourceHttpMessageConverter 和 Jaxb2RootElementHttpMessageConverter，可用来解析request body中输入的xml string。
其中 SourceHttpMessageConverter 将输入的xmlString 转换成xml的Source对象（如DomSource,SaxSource等），再在handlerMethod对输入的Source对象进行后续解析。

例如
   

@RequestMapping("/xml2.xml")
    public BeanJaxbA testXML2(@RequestBody DOMSource a){

          try {
            StringWriter writer = new StringWriter();
              StreamResult result = new StreamResult(writer);
              TransformerFactory tf = TransformerFactory.newInstance();
              Transformer transformer = tf.newTransformer();
              transformer.transform(a, result);
              System.out.println(writer.toString()) ;
        } catch (TransformerConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerFactoryConfigurationError e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (TransformerException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

@RequestMapping("/xml2.xml")
    public BeanJaxbA testXML2(@RequestBody DOMSource a){

          try {
			StringWriter writer = new StringWriter();
			  StreamResult result = new StreamResult(writer);
			  TransformerFactory tf = TransformerFactory.newInstance();
			  Transformer transformer = tf.newTransformer();
			  transformer.transform(a, result);
			  System.out.println(writer.toString()) ;
		} catch (TransformerConfigurationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (TransformerFactoryConfigurationError e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (TransformerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 

  
   
而Jaxb2RootElementHttpMessageConverter则通过JAXBinger机制将输入的xmlString直接转换成POJO对象。

例如
先定义带JAXB  annotation的pojo bean

@XmlRootElement(name="xmlStrA")
public class BeanJaxbA {
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    private String name;
    private String password;
    private long id;

}

@XmlRootElement(name="xmlStrA")
public class BeanJaxbA {
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}

	private String name;
	private String password;
	private long id;

}

在定义handler method如下

@RequestMapping("/xml.xml")
 public BeanJaxbA testXML1(@RequestBody BeanJaxbA a){
    BeanJaxbA a1 = new BeanJaxbA();
    a1.setId(2000);
    a1.setName("winzip");
    a1.setPassword("password");

    return a1;
 }

   @RequestMapping("/xml.xml")
    public BeanJaxbA testXML1(@RequestBody BeanJaxbA a){
    	BeanJaxbA a1 = new BeanJaxbA();
    	a1.setId(2000);
    	a1.setName("winzip");
    	a1.setPassword("password");
    	
    	return a1;
    }

这里spring mvc直接将输入的xml string 转换成为 BeanJaxA这个bean对象。
Xml格式输出
对于xml输出，Spring mvc提供了MarshallingView来提供对xml输出的支持。例如，在servlet context xml配置文件中增加如下配置。

<bean
    class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="order" value="1" />
    <property name="mediaTypes">
        <map>
            <entry key="json" value="application/json" />
            <entry key="xml" value="application/xml" /> <!-- SPR-7504 -->
        </map>
    </property>
    <property name="defaultViews">
        <list>
            <bean class="net.zhepu.json.MappingJacksonJsonView" />

            <bean name="jaxb2MarshallingView"
                class="org.springframework.web.servlet.view.xml.MarshallingView">
                <property name="marshaller" ref="jaxbMarshall"></property>
            </bean>
        </list>
    </property>
    <property name="ignoreAcceptHeader" value="true" />
</bean>
<oxm:jaxb2-marshaller id="jaxbMarshall">
    <oxm:class-to-be-bound name="net.zhepu.web.xmlModel.BeanJaxbA" />
</oxm:jaxb2-marshaller>

	<bean
		class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
		<property name="order" value="1" />
		<property name="mediaTypes">
			<map>
				<entry key="json" value="application/json" />
				<entry key="xml" value="application/xml" /> <!-- SPR-7504 -->
			</map>
		</property>
		<property name="defaultViews">
			<list>
				<bean class="net.zhepu.json.MappingJacksonJsonView" />

				<bean name="jaxb2MarshallingView"
					class="org.springframework.web.servlet.view.xml.MarshallingView">
					<property name="marshaller" ref="jaxbMarshall"></property>
				</bean>
			</list>
		</property>
		<property name="ignoreAcceptHeader" value="true" />
	</bean>
	<oxm:jaxb2-marshaller id="jaxbMarshall">
		<oxm:class-to-be-bound name="net.zhepu.web.xmlModel.BeanJaxbA" />
	</oxm:jaxb2-marshaller>

以上定义使用jaxbMarshall来将java bean 转换为xml string并利用ContentNegotiatingViewResolver来提供输出。

可访问测试工程中http://localhost:8080/springmvc/中新增的
“xml input jaxb test” 和 “xml input domsource test2”两个按钮来查看xml 数据输入输出的效果。