spring mvc就是好，特别是rest风格的话，一个
org.springframework.web.servlet.view.ContentNegotiatingViewResolver就可以根据不同的场景返回不同的view了，比如返回json,xml,pdf等.马上看代码实现
先是一个简单的pojo
[code="java"]
package com.hmkcode.vo;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "person")
public class Person {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString(){
return "ID: "+id+" - Name: "+name;
}
}
[/code]
注意使用@XmlRootElement标签之。
然后是controller:
[code="java"]
@Controller
public class MyController {
@RequestMapping("/view")
public Person getPerson(Model model){
Person person = new Person();
person.setId(1);
person.setName("test");
model.addAttribute("person",person);
return person;
}
[/code]
然后分别假设要导出为PDF的view，引入著名的itext了；
[code="java"]
public class PdfView extends AbstractPdfView {
protected void buildPdfDocument(
Map model,
Document doc,
PdfWriter writer,
HttpServletRequest req,
HttpServletResponse resp)
throws Exception {
Person person = (Person) model.get("person");
doc.add( new Paragraph(person.toString()));
}
[/code]
这里演示简单往itext中写入一个输出而已；
然后是web.xml:
[code="java"]
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
[/code]
最核心的配置来了：
[code="java"]
<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" />
<entry key="pdf" value="application/pdf" />
</map>
</property>
<property name="defaultViews">
<list>
<!-- JSON View -->
<bean
class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
</bean>
<!-- XML view -->
<bean class="org.springframework.web.servlet.view.xml.MarshallingView">
<constructor-arg>
<bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
<property name="classesToBeBound">
<list>
<value>com.test.Person</value>
</list>
</property>
</bean>
</constructor-arg>
</bean>
<!-- PDF view -->
<bean class="com.test.PdfView">
</bean>
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>
[/code]
可以看到，其中使用的是：
org.springframework.web.servlet.view.ContentNegotiatingViewResolver，对其pdf,xml.json进行分别的view设置，JSON用的是著名的jackyson去解析了；
最后，通过rest风格的地址，比如http://localhost/view/view.json,返回json；
http://localhost/view/view.pdf,则导出到pdf,http://localhost/view/view.xml，
返回前端就xml了，真的十分方便呀
