Spring4.0系列[email protected]
Spring4.0系列4-Meta Annotation(元注解)
Spring4.0系列6-Generic Qualifier(泛型限定)
Spring4.0系列7-Ordering Autowired Collections
更多正在编写中。。。
4.0重要的一个新的改进是@RestController注解,它继承自@Controller注解。4.0之前的版本,Spring MVC的组件都使用@Controller来标识当前类是一个控制器servlet。
使用这个特性,我们可以开发REST服务的时候不需要使用@Controller而专门的@RestController。
当你实现一个RESTful web services的时候,response将一直通过response body发送。为了简化开发,Spring 4.0提供了一个专门版本的controller。下面我们来看看@RestController实现的定义:
@Target(value=TYPE)
@Retention(value=RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController
官方文档解释:
A convenience annotation that is itself annotated with @Controller and @ResponseBody. Types that carry this annotation are treated as controllers where @RequestMapping methods assume @ResponseBody semantics by default.
注解本身使用@Controller和@ResponseBody注解。使用了这个注解的类会被看作一个controller-使用@RequestMapping的方法有一个默认的@ResponseBody注解。
@ResponseBody – As of version 4.0 this annotation can also be added on the type level in which case is inherited and does not need to be added on the method level.
@ResponseBody也可以加到类一级,通过继承方法一级不需要添加。
UserDetails.java
package javabeat.net.rest;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class UserDetails {
private String userName;
private String emailId;
@XmlAttribute
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
@XmlAttribute
public String getEmailId() {
return emailId;
}
public void setEmailId(String emailId) {
this.emailId = emailId;
}
}
SpringRestControllerDemo.java
package javabeat.net.rest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class SpringRestControllerDemo {
@Autowired UserDetails userDetails;
@RequestMapping(value="/springcontent",
method=RequestMethod.GET,produces={"application/xml", "application/json"})
@ResponseStatus(HttpStatus.OK)
public UserDetails getUser() {
UserDetails userDetails = new UserDetails();
userDetails.setUserName("Krishna");
userDetails.setEmailId("[email protected]");
return userDetails;
}
@RequestMapping(value="/springcontent.htm", method=RequestMethod.GET)
@ResponseStatus(HttpStatus.OK)
public String getUserHtml() {
//Test HTML view
return "example";
}
}
dispatcher-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <context:component-scan base-package="com.infosys.rest" /> <bean id="userDetails" class="javabeat.net.rest.UserDetails"/> <mvc:annotation-driven content-negotiation-manager="contentManager"/> <bean id="contentManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean"> <property name="favorPathExtension" value="true"/> <property name="ignoreAcceptHeader" value="true" /> <property name="defaultContentType" value="text/html" /> <property name="useJaf" value="false"/> <property name="mediaTypes"> <map> <entry key="json" value="application/json" /> <entry key="html" value="text/html" /> <entry key="xml" value="application/xml" /> </map> </property> </bean> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
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