java - Jersey 休息客户端不添加查询参数

Question

我正在尝试为 google search api 制作一个简单的 jersey rest 客户端。

Client client = ClientBuilder.newClient();
WebTarget target = client.target("https://www.googleapis.com/customsearch/v1");
target.queryParam("q", "mobile");
Response response = target.request().get();
System.out.println(response.readEntity(String.class));

如您所见，我没有包含 key 和 cx。别担心，这只是一个简单的演示。 当访问 url https://www.googleapis.com/customsearch/v1?q=mobile 时，响应是

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "dailyLimitExceededUnreg",
    "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
    "extendedHelp": "https://code.google.com/apis/console"
   }
  ],
  "code": 403,
  "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."
 }
}

这是正确的，因为我没有包含 key 和 cx。当我执行上面的代码时，我得到的响应是

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "required",
    "message": "Required parameter: q",
    "locationType": "parameter",
    "location": "q"
   }
  ],
  "code": 400,
  "message": "Required parameter: q"
 }
}

这相当于访问没有任何参数的 url (https://www.googleapis.com/customsearch/v1)，虽然我添加了这个 target.queryParam("q", "移动");.我做错了什么吗？

以上代码属于mavenized项目，依赖为

<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-client</artifactId>
    <version>2.14</version>
</dependency>

Answer 1

链接调用

Response response= client.target("https://www.googleapis.com/customsearch/v1")
.queryParam("q", "mobile").request().get();

来自文档:

Returns:A new target instance.

注意:- 如果没有链接，则获取新创建的 webtarget 实例并使用它。

WebTarget webTarget = client.target(snapshotGeneratorUrl);
webTarget = webTarget.queryParam("foo","foo").queryParam("bar",bar);
Response response = webTarget.request().get();