[REST Jersey] @ QueryParam Demo

HelloWorldResource. java

package com.example;    import javax.ws.rs.GET;  import javax.ws.rs.Path;  import javax.ws.rs.Produces;  import javax.ws.rs.QueryParam;  import javax.ws.rs.DefaultValue;  /**   *   * @author    */  @Path("helloworld")  public class HelloWorldResource {      public static final String CLICHED_MESSAGE = "Hello World!";      /*      @GET      @Produces("text/plain")      public String getHello() {          return CLICHED_MESSAGE;      }  */      @GET      @Path("/get")      @Produces("text/plain")      //@Produces("application/json")      public String getQueryObj(          @QueryParam ("featureID") @DefaultValue("0") String fid,          @QueryParam ("userID") @DefaultValue( "0" ) int uid,          @QueryParam ("color") @DefaultValue("red") ColorParam clr          // color default value: green, blue          ) {          return new String("QueryParam: {"+ fid + ": " + uid + " : " + clr + "}." + CLICHED_MESSAGE);      }    }  

 

ColorParam. java

package com.example;  import java.awt.Color;  import javax.ws.rs.WebApplicationException;  import java.lang.reflect.Field;    public class ColorParam extends Color {        public ColorParam(String s) {          super(getRGB(s));      }        private static int getRGB(String s) {          if (s.charAt(0) == '#') {              try {                  Color c = Color.decode("0x" + s.substring(1));                  return c.getRGB();              } catch (NumberFormatException e) {                  throw new WebApplicationException(400);              }          } else {              try {                  Field f = Color.class.getField(s);                  return ((Color)f.get(null)).getRGB();              } catch (Exception e) {                  throw new WebApplicationException(400);              }          }      }  }  

 

Call it after the above java files are packaged as a war deployed in tomcat container.

 http://hostname:8080/simple-service-webapp/webapi/helloworld/get?featureID=12  QueryParam: {12: 0 : com.example.ColorParam[r=255,g=0,b=0]}.Hello World!    http://hostname:8080/simple-service-webapp/webapi/helloworld/get?featureID=12&userID=123  QueryParam: {12: 123 : com.example.ColorParam[r=255,g=0,b=0]}.Hello World!    http://hostname:8080/simple-service-webapp/webapi/helloworld/get?

FeatureID = 12 & userID = 123 & color = yellow QueryParam: {12: 123: com. example. colorParam [r = 255, g = 255, B = 0]}. hello World!