How to call interface in java

In the actual development process, we often need to call the interface provided by the other party or test whether the interface written by ourselves is suitable. Therefore, the question is, how does Java call the interface? Many projects will encapsulate and specify the interface specifications of their own projects, so most of them need to call the interface provided by the other party or a third-party interface (text messages, weather, etc.). Of course, so does self-testing!

java How to call the interface

1. Open the connection to the url

URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

2. Set general request attributes

conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

3. Set whether to output to httpUrlConnection and whether to read from httpUrlConnection

In addition, sending a post request must be set. The two most commonly used Http requests are nothing more than get and post. The get request can obtain a static page, or you can put the parameters after the URL string and pass it to the servlet, post and get. The difference is that the post parameters are not placed in the URL string, but in the body of the http request.

conn.setDoOutput(true);
conn.setDoInput(true);

4. Disconnect

It is best to write that disconnect is only cut off when the underlying tcp socket link is idle. If it is being used by other threads, it will not be cut off. If multi-threading is fixed, if you do not disconnect, the number of links will increase until no more information can be sent or received. After writing disconnect, it becomes normal.

conn.disconnect();

Specific implementation code:

package com.c;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class ToInterface {
    /**
     * 调用对方接口方法
     * @param path 对方或第三方提供的路径
     * @param data 向对方或第三方发送的数据，大多数情况下给对方发送JSON数据让对方解析
     */
    public static void interfaceUtil(String path,String data) {
        try {
            URL url = new URL(path);
            //打开和url之间的连接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            PrintWriter out = null;
            //请求方式
//          conn.setRequestMethod("POST");
//           //设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); 
            //设置是否向httpUrlConnection输出，设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个
            //最常用的Http请求无非是get和post，get请求可以获取静态页面，也可以把参数放在URL字串后面，传递给servlet，
            //post与get的 不同之处在于post的参数不是放在URL字串里面，而是放在http请求的正文内。
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            //发送请求参数即数据
            out.print(data);
            //缓冲数据
            out.flush();
            //获取URLConnection对象对应的输入流
            InputStream is = conn.getInputStream();
            //构造一个字符流缓存
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String str = "";
            while ((str = br.readLine()) != null) {
                System.out.println(str);
            }
            //关闭流
            is.close();
            //断开连接，最好写上，disconnect是在底层tcp socket链接空闲时才切断。如果正在被其他线程使用就不切断。
            //固定多线程的话，如果不disconnect，链接会增多，直到收发不出信息。写上disconnect后正常一些。
            conn.disconnect();
            System.out.println("完整结束");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        interfaceUtil("http://api.map.baidu.com/telematics/v3/weather?location=嘉兴&output=json&ak=5slgyqGDENN7Sy7pw29IUvrZ", "");
//        interfaceUtil("http://192.168.10.89:8080/eoffice-restful/resources/sys/oadata", "usercode=10012");
//        interfaceUtil("http://192.168.10.89:8080/eoffice-restful/resources/sys/oaholiday",
//                    "floor=first&year=2017&month=9&isLeader=N");
    }
}

php Chinese website, a large number of free Java introductory tutorials, welcome to learn online!

The above is the detailed content of How to call interface in java. For more information, please follow other related articles on the PHP Chinese website!