java调用外部接口-创新互联

工作中经常遇到需要调用外部接口的场景  每次都需要百度  故在次记录一下留作备用  代码可复用

依赖

org.apache.httpcomponentshttpclient4.5.5com.alibabafastjson1.2.47

代码

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class A {
    public static void main(String[] args) {
        //String s = A.callOtherInterface();
    }

//场景下url固定  所以只传一个JSON字符串
    public static String callOtherInterface(String JSONString) {
        HttpClient client = HttpClients.createDefault();
        // 要调用的接口方法
        String url = "%此处填写url";
        HttpPost post = new HttpPost(url);
        JSONObject jsonObject = null;
        try {
            StringEntity s = new StringEntity("%此处填写JSON字符串", "UTF-8");
            //s.setContentEncoding("UTF-8");//此处测试发现不能单独设置字符串实体的编码，否则出错！应该在创建对象时创建
            s.setContentType("application/json");
            post.setEntity(s);
            post.addHeader("content-type", "application/json;charset=UTF-8");
            HttpResponse res = client.execute(post);
            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                // 返回json格式：
                jsonObject = JSONObject.parseObject(EntityUtils.toString(res.getEntity()));
            }
        } catch (Exception e) {
            System.out.println("服务间接口调用出错！");
            e.printStackTrace();
            //throw new RuntimeException(e);
        }
        return jsonObject.toString();
    }
}

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