Question

我正在调用ResourceB Inside ResourceA。

两者都使用相同的查询参数“param1”。

如何在调用ResourceB之前更改ResourceA中“param1”的值。

以下是代码：

package com.example;

import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import com.sun.jersey.api.core.ResourceContext;

public abstract class MyResource {
    ResponseBuilder response;
    Request request;
    protected String param1;

    public MyResource(@QueryParam("param1") String param1, @Context Request request) {
        this.param1 = param1;
        this.request = request;
        this.response = Response.ok();
    }
}

public class ResourceA extends MyResource {
    public ResourceA(String param1, Request request) {
        super(param1, request);
    }
    @Context private ResourceContext rc;
    public Response postJSON(String postData) {
        JSONObject data = JSONObject.fromObject(postData);
        if (data.has("resourceB")) {
            ResourceB resourceB = rc.getResource(ResourceB.class);
            // resourceB.setQueryParams("param1", "my new param 1");
            resourceB.postJSON(data.getJSONArray("resourceB"));
        }
    }
}

public class ResourceB extends MyResource {
    public ResourceB(String param1, Request request) {
        super(param1, request);
    }

    public Response postJSON(JSONArray data) {
        // this.params1 should not be "my new param 1"
    }
}

Answer 1

如何使用ResourceContext.initResource(T resource)，使用修改后的值初始化资源，并通过声明JAX-RS注释字段来控制DI提供程序注入的内容？
如果我理解你的问题，你想在找到匹配的资源方法之后修改请求上下文，或者挂钩注入并更改一些值。我不确定这是否可能。

但是，正如我所建议的那样，如果可以进行一些设计修改，您可以通过编程方式初始化资源并利用仅注入的字段：

public Response postJSON(String postData) {
    JSONObject data = JSONObject.fromObject(postData);
    if (data.has("resourceB")) {
        ResourceB resourceB = new ResourceB(/* pass here the modified query param */ "my new param 1");
        // let the DI provider inject the JAX-RS annotated fields only
        resourceB = rc.initResource(resourceB);
        // resourceB.setQueryParams("param1", "my new param 1");
        resourceB.postJSON(data.getJSONArray("resourceB"));
    }
}

ResourceB类本身（及其超类）将声明要注入的带注释的字段，而@QueryParam("param1")（可能还有其他JAX-RS知道）（））将在构造函数中声明，以便不会被覆盖。

public abstract class MyResource {
    ResponseBuilder response;

    // this gets injected in the ResourceContext.initResource() method
    @Context
    Request request;

    // additional JAX-RS annotated fields you would like to have injected such as
    @PathParam("id")
    private String pathParamId;

    protected String param1;

    // constructor JAX-RS annotated parameters would not get re-initialized  
    public MyResource(@QueryParam("param1") String param1) {
        this.param1 = param1;
        this.request = request;
        this.response = Response.ok();
    }
}

Jersey - 修改资源内的查询参数

1 个答案: