Programming Cloud Services for Android Handheld Systems Week 3

1. Java Annotation @indentifier by compiler

2. HTTP to Object Marshalling

3. Intro to JSON

4. The Spring Dispatcher Servlet and Controller Abstraction using spring framework to dispatcher servlet: extract parameter from request, validation,construct object with params

5. Spring Controllers tell the dispatcher servlet @Controller public class ContactsCtrl{ @RequestMapping(“/contacts”) public Contacts getContacts(){ //retrieve contacts

    return C;  }  @RequestMapping("/friends")  public Contacts friends(){  }  } 
   

need to connect to the request use @annotation

1. Accepting Client Data with RequestParam Annotations @Controller public class ContactsCtrl{ @RequestMapping(“/path”) public Contacts search( //http request paramters with key search @RequestParam(“search”) String searchString, //convert flag to int @RequestParam(“flag”) int searchFlag){

   }

}

1. Accepting ClientData with PathVarialbe Annotations rest architecture // /search/ab //look into the path, things after the /search/ is a variable named string @RequestMapping(“/search/{string}”) public Contacts search( @PathVar(“string”) String searchStr, @RequestParam(“flag”) int flag){ return; }

2. Accepting Client Data with Request Body Annotaions & JSON

public class Search{ private String first; private String last; } @RequestMapping(“search”) public Contacts search( //take all the params to convert to a seach body, HTTP message convert @RequestBody Search s){

}

1. Handling Multipart Data public Class VideoSvc{ public boolean uploadVideo( @RequestParam(“data”) MultipartFile videoData){

    InputStream in = VideoData.getInputStream();
    //save to desk
    //save to database
   

   } } //add a new bean to accept multipart data public Class Application{ @Bean public MultipartConfigElement getMultipartConfig(){ MultipartConfigFactory f = … f.setMaxFileSize(2000); f.setMaxRequestSize(); return f.createMultipartConfig(); } }

2. Generating Responses with the ResponseBody Annotation //return the response body to json public @ResponseBody contact search(){ //find contact

   return contact;

}

1. Custom Marshlling with Jackson Annotations

public Video createVideo(video){ //from json //Jackson ObjectMaper //to json } @JsonIgnore

1. Spring Boot & Application structure

2. Spring Controller Code Walkthrough