httpclient请求和gson解析JSON

引入包

org.apache.httpcomponents:httpclient:4.5.13
com.google.code.gson:gson:2.9.0

JSON类型

import java.util.List;

public class ResultBean {
    public String status;
    public String state;
    public List<Value> data;
    public static class Value {
        public String value;
    }
}

测试用例

import com.google.gson.*;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.IOException;

public class Test {
    public static void main(String[] args) throws IOException {
        int total = 0;
        // HTTP请求数据
        CloseableHttpClient client = HttpClients.createDefault();
        RequestBuilder requestBuilder = RequestBuilder.get()
                .setUri("http://test/test.json");
//                .addParameter("page", "" + 1)
//                .addParameter("sign", "1")
//                .addParameter("t", "" + 1);
        HttpUriRequest httpUriRequest = requestBuilder.build();
        HttpResponse httpResponse = client.execute(httpUriRequest);
        String jsonString = EntityUtils.toString(httpResponse.getEntity());
        System.out.println(jsonString);

        // Gson解析json
        Gson gson = new Gson();
        // json转换成ResultBean对象
        ResultBean resultBean = gson.fromJson(jsonString, ResultBean.class);
        for (ResultBean.Value v : resultBean.data) {
            total += Integer.parseInt(v.value.trim());
        }
        System.out.println("Total:" + total);

        // 遍历JSON
        JsonObject jsonObject = JsonParser.parseString(jsonString).getAsJsonObject();
        JsonArray jsonArray = (JsonArray) jsonObject.get("data");
        for(JsonElement jsonElement : jsonArray) {
            JsonObject jo = jsonElement.getAsJsonObject();
            System.out.println(jo.get("value"));
        }
    }
}

运行结果

{
    "status": "success",
    "state": "1",
    "data": [{
            "value": 1
        }, {
            "value": 2
        }
    ]
}

Total:3
1
2