Spring 3 mvc中返回pdf,json,xml等不同的view

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

 


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; 
    } 
  
} 

   注意使用@XmlRootElement标签之。


然后是controller:
  

 
@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; 
    } 

  然后分别假设要导出为PDF的view，引入著名的itext了；

 
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())); 
  
    } 

   这里演示简单往itext中写入一个输出而已；


然后是web.xml:

 
<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> 

  最核心的配置来了：

 
         <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> 

   
   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