• Wires values evaluated from expressions
• Works in XML and annotations

 <bean class="com.springinaction.peanuts.Blanket">
 <property name="color" value="#{someOtherBean.color}" />
 </bean>

 @Component
 public class Blanket {
  @Value("#{someOtherBean.color}")
  private String color;
  public Blanket() { } // ... 
 }

Any bean ID systemProperties Scope/Context-specific... contextProperties contextAttributes request session

"#{settingBean.databaseUrl}"

"#{systemProperties.favoriteColor}"

"#{systemProperties.favoriteColor == 'red'}"

"#{T(java.lang.Math).random()}"

"The time is #{T(java.lang.System).currentTimeMillis()}"

"#{snoopyPersonas.![name]}"

• Spring 2.5:

  @Controller
  public class SpittleListController {
   @RequestMapping("/spittleList.htm")
   public String displaySpittleList(@RequestParam("username") String userName) {
    // ...
    return "spittleList";
   }
  }
  http://localhost:8080/spitter/spittleList.htm?username=habuma

• Spring 3.0:

  @Controller
  public class SpittleListController {
   @RequestMapping("/{username}/list")
   public String displaySpittleList(@PathVariable("username") String userName) {
    // ...
    return "spittleList";
   }
  }
  http://localhost:8080/spitter/habuma/list

• Spring 2.5:

  @Controller
  public class HomeController {
   @RequestMapping("/home")
   public String displayHomePage(HttpServletRequest request) {
    String userAgent = request.getHeader("User-Agent");
    // ...
    return "home";
   }
  }

• Spring 3.0:

  @Controller
  public class HomeController {
   @RequestMapping("/home")
   public String displayHomePage(@RequestHeader("User-Agent") String userAgent) {
    // ...
    return "home";
   }
  }

• Spring 2.5:

  @Controller
  public class HomeController {
   @RequestMapping("/home")
   public String displayHomePage(HttpServletRequest request) {
    String lastVisit = "never";
    Cookie[] cookies = request.getCookies();
    for (Cookie cookie : cookies) {
     if("LastVisit".equals(cookie.getName())) {
      lastVisit = cookie.getValue();
     }
    }
    // ... return "home";
   }
  }

• Spring 3.0:

  @Controller
  public class HomeController {
   @RequestMapping("/home")
   public String displayHomePage(@CookieValue("LastVisit") String lastVisit) {
    // ...
    return "home";
   }
  }

  @RequestParam(value="productId", defaultValue="1234")
  String productId

  @RequestHeader(value="User-Agent", defaultValue="1234")
  String userAgent
  @CookieValue(value="LastVisit", defaultValue="1234")
  String lastVisit

  <spring:url value="/spittle/{id}/edit" var="editUrl" escapeXml="true">
   <spring:param name="id" value="${spittle.id}" />
  </spring:url>
  <a href="${editUrl}">Do something</a>

Based on JSR-303 validators Hibernate Validator as default implementation Primarily used to validate inputs to Spring MVC controllers Configured automatically with <mvc:annotation-driven/>

• In entity class

 @Column(name="spittleText")
 @NotNull In entity
 @Size(min=1, max=140)
 class
  public String getText() {
   return this.text;
  }

• In Spring MVC controller

  @RequestMapping(method=POST)
  public String addSpittle(@Valid Spittle spittle, BindingResult result) {
   if(result.hasErrors())
    return "spittle/form";
   spitterService.addSpittle(spittle);
   return "redirect:/home";
  }

• ShallowEtagHeaderFilter

  <filter>
   <filter-name>etagFilter</filter-name>
   <filter-class> org.springframework.web.filter.ShallowEtagHeaderFilter </filter-class>
  </filter>
  <filter-mapping>
   <filter-name>etagFilter</filter-name>
   <servlet-name>spitter</servlet-name>
  </filter-mapping>

HTTP defines four methods: GET, POST, DELETE, and PUT HTML only supports 2: GET and POST Spring 3’s HiddenHttpMethodFilter fixes that

 <filter>
  <filter-name>hiddenMethodFilter</filter-name>
  <filter-class> org.springframework.web.filter.HiddenHttpMethodFilter </filter-class>
 </filter>
 <filter-mapping>
  <filter-name>hiddenMethodFilter</filter-name>
  <servlet-name>spitter</servlet-name>
 </filter-mapping>

POST를 사용하면서 hidden parameter로 Method를 명시하면 해당 Method로 변환해주는 HiddenHttpMethodFilter 제공 스프링 form 태그에서 이 기능을 지원하기 때문에 form 태그의 method에 delete, put도 사용 가능.

<form:form method="delete">
    <p class="submit"><input type="submit" value="Delete Pet"/></p>
</form:form>

 <form:form method="delete">
  <p class="submit"><input type="submit" value="Delete Spittle"/></p>
 </form:form>

 @RequestMapping(method = RequestMethod.DELETE)
 public String deleteSpittle(@PathVariable long spittleId) {
  spittleService.deleteSpittle(spittleId);
  return "redirect:/home";
 }

• Read

  RestTemplate template = new RestTemplate();
  template.getForObject("http://localhost:8080/spitter/users/${id}", String.class, userId);

• Create

  RestTemplate template = new RestTemplate();
  SpitterUser user = new SpitterUser(userName, password);
  template.postForLocation("http://localhost:8080/spitter/users/${id}", user, userId);

• Delete RestTemplate

  template = new RestTemplate();
  template.delete("http://localhost:8080/spitter/users/${id}", userId);

• Annotate a bean method

 @Async public void backgroundJob() { ... }

• In Spring configuration

 <task:annotation-driven/>