okhttp网络请求(基础)

**加依赖:implementation 'com.squareup.okhttp3:okhttp:3.12.0'**


kage com.gj.logindemo.http;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class Utils {
    public static String get(String urlString){

    OkHttpClient okHttpClient = new OkHttpClient();

    Request request = new Request.Builder().url(urlString).get().build();

    try {
        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "";
}

public static String postForm(String url,String[] name,String[] value){

    OkHttpClient okHttpClient = new OkHttpClient();

    FormBody.Builder formBuild = new FormBody.Builder();
    for (int i = 0; i < name.length; i++) {
        formBuild.add(name[i],value[i]);
    }

    Request request = new Request.Builder().url(url).post(formBuild.build()).build();

    try {
        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "";
}

public static String postFile(String url,String[] name,String[] value,String fileParamName,File file){

    OkHttpClient okHttpClient = new OkHttpClient();

    MultipartBody.Builder requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM);
    if(file != null){
        // MediaType.parse() 里面是上传的文件类型。
        RequestBody body = RequestBody.create(MediaType.parse("image/*"), file);
        String filename = file.getName();
        // 参数分别为: 文件参数名 ，文件名称 ， RequestBody
        requestBody.addFormDataPart(fileParamName, "jpg", body);
    }
    if (name!=null) {
        for (int i = 0; i < name.length; i++) {
            requestBody.addFormDataPart(name[i], value[i]);
        }
    }

    Request request = new Request.Builder().url(url).post(requestBody.build()).build();

    try {
        Response response = okHttpClient.newCall(request).execute();
        if (response.code()==200) {
            return response.body().string();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "";
}

public static String postJson(String url,String jsonString){

    OkHttpClient okHttpClient = new OkHttpClient();

    RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),jsonString);

    Request request = new Request.Builder().url(url).post(requestBody).build();

    try {
        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "";
}

}