休息 JAX RS : Jersey : How to read pathparam of root resource in sub resource?

Question

我试图读取子资源文件中的根资源路径参数，但出现错误。请帮我。

我遵循的方式是:

根资源服务:

@Path("/{messageId}/comments")
public CommentResource getCommentResources(){
    return new CommentResource();
}

子资源代码:

@Path("/")
public class CommentResource {

    private CommentDAOImpl commentDaoObject = new CommentDAOImpl();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public ArrayList<Comment> getAllCommentsForAMessage(@PathParam("messageId") long messageId){
        return commentDaoObject.getAllCommentsForMessage(messageId);
    }

    @Path("/{commentId}")
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Comment getCommentForAMessage(@PathParam("commentId") long commentId, @PathParam("messageId") long messageId){
        return commentDaoObject.getCommentForMessage(messageId, commentId);
    }
}

在读取子资源中的“messageId”路径参数时，我收到错误:

Error: @PathParam value 'messageId' does not match any @Path annotation template parameters of the java method 'getCommentForAMessage' and its enclosing java type 'org.ramesh.jrs.Messenger.resources.CommentResource'.

谁能帮我解决这个问题吗？

Answer 1

如果要将参数传递给资源类，则必须使用ResourceContext.initResource method .

这是修改代码的方法:

根资源服务

@Path("/{messageId}/comments")
public CommentResource getCommentResources(@PathParam("messageId") long messageId, @Context ResourceContext resourceContext){
    return resourceContext.initResource(new CommentResource(messageId));
}

子资源代码:

public class CommentResource {

    private CommentDAOImpl commentDaoObject = new CommentDAOImpl();
    private long messageId;

    public CommentResource(long messageId) {
        this.messageId = messageId;
    }

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public ArrayList<Comment> getAllCommentsForAMessage(){
        return commentDaoObject.getAllCommentsForMessage(messageId);
    }

    @GET
    @Path("/{commentId}")
    @Produces(MediaType.APPLICATION_JSON)
    public Comment getCommentForAMessage(@PathParam("commentId") long commentId){
        return commentDaoObject.getCommentForMessage(messageId, commentId);
    }

}