Android＜Get提交＞and＜Post提交＞

需要引入的包

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telecom.Connection;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

需要用到的java代码

public class Http {
    
    public String post(String url1, String data) {
        try {
            URL url = new URL(url1);
            HttpURLConnection Connection = (HttpURLConnection) url.openConnection();//创建连接
            Connection.setRequestMethod("POST");
            Connection.setConnectTimeout(3000);
            Connection.setReadTimeout(3000);
            Connection.setDoInput(true);
            Connection.setDoOutput(true);
            Connection.setUseCaches(false);
            Connection.connect();
            DataOutputStream dos = new DataOutputStream(Connection.getOutputStream());
            String title = data;//这里是POST请求需要的参数字符串类型，例如"id=1&data=2"
            dos.write(title.getBytes());
            dos.flush();
            dos.close();//写完记得关闭
            int responseCode = Connection.getResponseCode();
            if (responseCode == Connection.HTTP_OK) {//判断请求是否成功
                InputStream inputStream = Connection.getInputStream();
                ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
                byte[] bytes = new byte[1024];
                int length = 0;
                while ((length = inputStream.read(bytes)) != -1) {
                    arrayOutputStream.write(bytes, 0, length);
                    arrayOutputStream.flush();
                }//读取响应体的内容
                String s = arrayOutputStream.toString();
                return s;//返回请求到的内容，字符串形式
            } else {
                return "-1";//如果请求失败返回-1
            }
        } catch (Exception e) {
            return "-1";//出现异常也返回-1
        }
    }

    public String get(String url1) {
        try {
            URL url = new URL(url1);
            HttpURLConnection Connection = (HttpURLConnection) url.openConnection();
            Connection.setRequestMethod("GET");
            Connection.setConnectTimeout(3000);
            Connection.setReadTimeout(3000);
            int responseCode = Connection.getResponseCode();
            if (responseCode == Connection.HTTP_OK) {
                InputStream inputStream = Connection.getInputStream();
                ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
                byte[] bytes = new byte[1024];
                int length = 0;
                while ((length = inputStream.read(bytes)) != -1) {
                    arrayOutputStream.write(bytes, 0, length);
                    arrayOutputStream.flush();//强制释放缓冲区
                }
                String s = arrayOutputStream.toString();
                return s;
            } else {
                return "-1";
            }
        } catch (Exception e) {
            return "-1"; 
        }
    }
    
    public static boolean 检查网络状态(Context context) {
        NetworkInfo activeNetworkInfo = ((ConnectivityManager) context.getSystemService("connectivity")).getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected() && activeNetworkInfo.getState() == NetworkInfo.State.CONNECTED;
    }

    public static boolean 网络可用性(Context context) {
        if (context == null) {
            return false;
        }
        try {
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService("connectivity");
            if (connectivityManager != null) {
                return connectivityManager.getActiveNetworkInfo().isAvailable();
            }
            return false;
        } catch (Exception e) {
            return false;
        }
    }

}

//使用时创建Http类
Http _http = new Http();
//get提交
String _return = _http.get(链接);
//post提交
String _return = _http.post(链接,参数);
//另外还有两个方法
//检测网络是否能用
_http.网络可用性();
//检测网络状态
_http.检测网络状态();