How to read Headers in Spring Boot Controller

Suppose we have a controller and want to bind the Headers to a variable, then we can do the following

 
    @RequestHeader(value = "Accept-Language", defaultValue = "en") String locale

This will bind the Header Accept-Language, to the variable locale.

• value="" It defines the name of the header to bind to the variable
• required= boolean It tells if this is mandatory header or not. default value is true
• defaultValue ="" It can be used to give a default value if the header is not present.

Similarly you can bind Custom Headers like shown below

     // String
    @RequestHeader(value = "X-My-String-Header", defaultValue = "Hello World") String h1
     // Long
    @RequestHeader(value = "X-My-Long-Header", defaultValue = 212) Long h2

Binding data from URL to a variable

Suppose you want to have bind some data from URL then you can do the following

• create the @RequestMapping annotation e.g
  
  • /list/{id}
  • /{version}/list/{id}
• bind the Url parameters using @PathVariable annotation e.g
  
  • @PathVariable("id") Long id
  • @PathVariable("version") int version,@PathVariable("id") Long id

Complete code may look like this,

    @RequestMapping("list/{id}")
    public Object list(@PathVariable("id") Long id ){

     // Logic goes here 

    }

    @RequestMapping("/{version}/list/{id}")
    public Object list(@PathVariable("version") int version,@PathVariable("id") Long id ){

     // Logic goes here 

    }

Different ways to Bind Elements to Model/ Directives

You can bind the Angular Elements to the Model in the following ways.

  <span ng-bind="name"></span> <br/>
  <span ng:bind="name"></span> <br/>
  <span ng_bind="name"></span> <br/>
  <span data-ng-bind="name"></span> <br/>
  <span x-ng-bind="name"></span> <br/>

So the above ways are
Following example in the Plunk shows the various ways to write our angular directive.




Now most of the above code works perfectly with angular js but they may cause HTML validation to fail. So if you want your code to be Html validatable then you should use

 <span data-ng-bind="name"></span>