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JAX-RS @ formparam and @ headerparam

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Author: User
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Continue learning about @ formparam and @ headerparam in the JAX-RS today

1 @ formparam
The function is to bind the front-end html. Let's look at the example first.

 

Java code
  2. HTML>
  3. <Body>
  4. <H1> JAX-RS @ formquery testing
  6. <Form action = "rest/user/Add" method = "Post">
  8. Name: <input type = "text" name = "name"/>
  12. Age: <input type = "text" name = "Age"/>
  15. <Input type = "Submit" value = "Add User"/>
  16. </Form>
  18. </Body>
  19. </Html>
html><body>

Processing:
Java code



 
    
 
  
  1. @ Path ("/user ")
    2. 
 
  
  2. Public class userservice {
    3. 
 
  
  3. 
 
  
  4. @ Post
    5. 
 
  
  5. @ Path ("/Add ")
    6. 
 
  
  6. Public Response adduser (
    7. 
 
  
  7. @ Formparam ("name") string name,
    8. 
 
  
  8. @ Formparam ("Age") int age ){
    9. 
 
  
  9. 
 
  
  10. Return response. Status (200)
    11. 
 
  
  11. . Entity ("adduser is called, name:" + name + ", age:" + age)
    12. 
 
  
  12. . Build ();
    13. 
 
  
  13. 
 
  
  14. }
    15. 

 


@Path("/user")public class UserService { @POST@Path("/add")public Response addUser(@FormParam("name") String name,@FormParam("age") int age) { return Response.status(200).entity("addUser is called, name : " + name + ", age : " + age).build(); }


For front-end HTML browsing, such:
Http: // localhost: 8080/restfulexample/userform.html
A common HTML form will appear. When the button is submitted, it will go
HTTP: /localhost: 8080/restfulexample/rest/user/Add
In this way, rest will match the adduser method, so the data submitted in the form will be output.


2 In the JAX-RS, there are two ways to get the HTTP Request Header,
1) @ headparam
Java code



 
    
 
  
  1. 
 
  
  2. @ Path ("/users ")
    3. 
 
  
  3. Public class userservice {
    4. 
 
  
  4. 
 
  
  5. @ Get
    6. 
 
  
  6. @ Path ("/get ")
    7. 
 
  
  7. Public Response adduser (@ headerparam ("User-Agent") string useragent ){
    8. 
 
  
  8. 
 
  
  9. Return response. Status (200)
    10. 
 
  
  10. . Entity ("adduser is called, useragent:" + useragent)
    11. 
 
  
  11. . Build ();
    12. 
 
  
  12. 
 
  
  13. }
    14. 

 


@Path("/users")public class UserService { @GET@Path("/get")public Response addUser(@HeaderParam("user-agent") String userAgent) { return Response.status(200).entity("addUser is called, userAgent : " + userAgent).build(); }


When the access URL:
/Users/get
Will output the HTTP header information, namely:
Adduser is called, useragent: Mozilla/5.0 (Windows NT 6.1; RV: 5.0) Gecko/20100101 Firefox/5.0


In addition, the Java code


 
    
 
  
  1. @ Path ("/users ")
    2. 
 
  
  2. Public class userservice {
    3. 
 
  
  3. 
 
  
  4. @ Get
    5. 
 
  
  5. @ Path ("/get ")
    6. 
 
  
  6. Public Response adduser (@ context httpheaders headers ){
    7. 
 
  
  7. 
 
  
  8. String useragent = headers. getrequestheader ("User-Agent"). Get (0 );
    9. 
 
  
  9. 
 
  
  10. Return response. Status (200)
    11. 
 
  
  11. . Entity ("adduser is called, useragent:" + useragent)
    12. 
 
  
  12. . Build ();
    13. 
 
  
  13. 
 
  
  14. }
    15. 

 


@Path("/users")public class UserService { @GET@Path("/get")public Response addUser(@Context HttpHeaders headers) { String userAgent = headers.getRequestHeader("user-agent").get(0); return Response.status(200).entity("addUser is called, userAgent : " + userAgent).build(); }


You can achieve the same purpose.

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