如果您只希望调用REST服务并解析响应，则可以尝试REST Assured

// Make a GET request to "/lotto"
String json = get("/lotto").asString()
// Parse the JSON response
List<String> winnderIds = with(json).get("lotto.winners.winnerId");

// Make a POST request to "/shopping"
String xml = post("/shopping").andReturn().body().asString()
// Parse the XML
Node category = with(xml).get("shopping.category[0]");

OkHttp在与Retrofit结合使用时是轻量级和强大的。这适用于一般的Java使用，也适用于Android。

OkHttp: http://square.github.io/okhttp/

public static final MediaType JSON
    = MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

String post(String url, String json) throws IOException {
  RequestBody body = RequestBody.create(JSON, json);
  Request request = new Request.Builder()
      .url(url)
      .post(body)
      .build();
  Response response = client.newCall(request).execute();
  return response.body().string();
}

改造:http://square.github.io/retrofit/

public interface GitHubService {
  @GET("/users/{user}/repos")
  Call<List<Repo>> listRepos(@Path("user") String user);
}

你也可以检查具有完整客户端功能的Restlet，它比httppurlconnection或Apache HTTP Client(我们可以作为连接器使用)等底层库更面向REST。

最好的问候, 杰罗姆Louvel

泽西休息客户端的例子

添加依赖项:

<!-- Jersey -->
<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>1.8</version>
</dependency>

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-server</artifactId>
    <version>1.8</version>
</dependency>
    
<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.8</version>
</dependency>

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>

对于GetMethod，并传递两个参数:

Client client = Client.create();
WebResource webResource1 = client
                        .resource("http://localhost:10102/NewsTickerServices/AddGroup/"
                                + userN + "/" + groupName);

ClientResponse response1 = webResource1.get(ClientResponse.class);
System.out.println("responser is" + response1);

GetMethod传递一个参数并获得一个List类型的响应:

Client client = Client.create();
 
WebResource webResource1 = client
                    .resource("http://localhost:10102/NewsTickerServices/GetAssignedUser/"+grpName);    
//value changed
String response1 = webResource1.type(MediaType.APPLICATION_JSON).get(String.class);
 
List <String > Assignedlist = new ArrayList<String>();
JSONArray jsonArr2 = new JSONArray(response1);
for (int i =0;i<jsonArr2.length();i++){
        
    Assignedlist.add(jsonArr2.getString(i));    
}

上面它返回一个列表，我们将其作为list对象接受，然后将其转换为JSONArray，然后从JSONArray转换为list。

Post请求传递JSONObject作为参数:

Client client = Client.create();
WebResource webResource = client
            .resource("http://localhost:10102/NewsTickerServices/CreateJUser");
// value added

ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).post(ClientResponse.class, mapper.writeValueAsString(user));

if (response.getStatus() == 500) {

    context.addMessage(null, new FacesMessage("User already exist "));
}

你可以试试拉帕。让我们知道你的反馈。 并随时记录问题或预期的功能。

如果您只希望调用REST服务并解析响应，则可以尝试REST Assured

// Make a GET request to "/lotto"
String json = get("/lotto").asString()
// Parse the JSON response
List<String> winnderIds = with(json).get("lotto.winners.winnerId");

// Make a POST request to "/shopping"
String xml = post("/shopping").andReturn().body().asString()
// Parse the XML
Node category = with(xml).get("shopping.category[0]");