Spring mvc中返回类型 pdf,json,xml等

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: 

1. <servlet>  

2.         <servlet-name>springmvc</servlet-name>  

3.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  

4.         <load-on-startup>1</load-on-startup>  

5.     </servlet>  

6.    

7.     <servlet-mapping>  

8.         <servlet-name>springmvc</servlet-name>  

9.         <url-pattern>/rest/*</url-pattern>  

10.     </servlet-mapping>

spring.xml核心配置

         <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" />
           <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>      

org.springframework.web.servlet.view.ContentNegotiatingViewResolver，对其pdf,xml.json进行分别的view设置

 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