webservice里的@queryparam、@pathparam、@DefaultValue使用介绍

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1 先来看@queryparam
先看例子:

Path("/users") public class UserService {       @GET     @Path("/query")     public Response getUsers(         @QueryParam("from") int from,         @QueryParam("to") int to,         @QueryParam("orderBy") List<String> orderBy) {           return Response            .status(200)            .entity("getUsers is called, from : " + from + ", to : " + to             + ", orderBy" + orderBy.toString()).build();       }   }

URL输入为:

users/query?from=100&to=200&orderBy=age&orderBy=name

此时,输出为:

getUsers is called, from : 100, to : 200, orderBy[age, name]

要注意的是,跟@pathparam不同,@queryparam
中,指定的是URL中的参数是以键值对的形式出现的,而在程序中
@QueryParam("from") int from则读出URL中from的值,
而@pathparem中,URL中只出现参数的值,不出现键值对,比如:
“/users/2011/06/30”

则:

@GET     @Path("{year}/{month}/{day}")     public Response getUserHistory(             @PathParam("year") int year,             @PathParam("month") int month,              @PathParam("day") int day) {          String date = year + "/" + month + "/" + day;          return Response.status(200)         .entity("getUserHistory is called, year/month/day : " + date)         .build();       }

输出为:

getUserHistory is called, year/month/day : 2011/6/30

2 以动态的方式获得:

@Path("/users") public class UserService {       @GET     @Path("/query")     public Response getUsers(UriInfo info) {           String from = info.getQueryParameters().getFirst("from");         String to = info.getQueryParameters().getFirst("to");         List<String> orderBy = info.getQueryParameters().get("orderBy");           return Response            .status(200)            .entity("getUsers is called, from : " + from + ", to : " + to             + ", orderBy" + orderBy.toString()).build();       }}

输入为：

URL;users/query?from=100&to=200&orderBy=age&orderBy=name

输出为:

getUsersis called, from : 100, to : 200, orderBy[age, name]

注意这里把orderby后的两个参数读入为LIST处理了.

3 @DefaultValue,默认值

例子:

@Path("/users") public class UserService {       @GET     @Path("/query")     public Response getUsers(         @DefaultValue("1000")@QueryParam("from") int from,        @DefaultValue("999")@QueryParam("to") int to,         @DefaultValue("name")@QueryParam("orderBy") List<String> orderBy) {           return Response            .status(200)           .entity("getUsers is called, from : " + from + ", to : " +to             + ",orderBy" + orderBy.toString()).build();       }

输入：

URL:users/query

输出:

getUsers is called, from : 1000, to : 999,orderBy[name]

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