okhttp的使用
首先在build.gradle中倒入第三方库:
//okhttp网络请求 implementation 'com.squareup.okhttp3:okhttp:3.6.0'
新建一个java文件,取名OkHttp.java
package com.asj.smgscreen.ThirdPart; import android.content.Context; import android.os.Handler; import android.os.Looper; import com.franmontiel.persistentcookiejar.PersistentCookieJar; import com.franmontiel.persistentcookiejar.cache.SetCookieCache; import com.franmontiel.persistentcookiejar.persistence.SharedPrefsCookiePersistor; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import java.util.concurrent.TimeUnit; import okhttp3.Call; import okhttp3.Callback; import okhttp3.FormBody; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; /** * Created by turboks on 2017/12/2. */ public class OkHttp { /** * 静态实例 */ private static OkHttp sOkHttpManager; /** * okhttpclient实例 */ private OkHttpClient mClient; /** * 因为我们请求数据一般都是子线程中请求,在这里我们使用了handler */ private Handler mHandler; /** * 构造方法 */ public OkHttp(Context context) { PersistentCookieJar cookieJar = new PersistentCookieJar(new SetCookieCache(), new SharedPrefsCookiePersistor(context)); mClient = new OkHttpClient.Builder().cookieJar(cookieJar).build(); /** * 在这里直接设置连接超时.读取超时,写入超时 */ mClient.newBuilder().connectTimeout(10, TimeUnit.SECONDS); mClient.newBuilder().readTimeout(10, TimeUnit.SECONDS); mClient.newBuilder().writeTimeout(10, TimeUnit.SECONDS); /** * 如果是用的3.0之前的版本 使用以下直接设置连接超时.读取超时,写入超时 */ //client.setConnectTimeout(10, TimeUnit.SECONDS); //client.setWriteTimeout(10, TimeUnit.SECONDS); //client.setReadTimeout(30, TimeUnit.SECONDS); /** * 初始化handler */ mHandler = new Handler(Looper.getMainLooper()); } /** * 单例模式 获取OkHttp实例 * * @return */ public static OkHttp getInstance(Context context) { if (sOkHttpManager == null) { sOkHttpManager = new OkHttp(context); } return sOkHttpManager; } //-----登录清除 public static OkHttp getLogin(Context context) { sOkHttpManager = new OkHttp(context); return sOkHttpManager; } //-------------------------同步的方式请求数据-------------------------- /** * 对外提供的get方法,同步的方式 * * @param url 传入的地址 * @return */ public static Response getSync(String url) { //通过获取到的实例来调用内部方法 return sOkHttpManager.inner_getSync(url); } /** * GET方式请求的内部逻辑处理方式,同步的方式 * * @param url * @return */ private Response inner_getSync(String url) { Request request = new Request.Builder().url(url).build(); Response response = null; try { //同步请求返回的是response对象 response = mClient.newCall(request).execute(); } catch (IOException e) { e.printStackTrace(); } return response; } /** * 对外提供的同步获取String的方法 * * @param url * @return */ public static String getSyncString(String url) { return sOkHttpManager.inner_getSyncString(url); } /** * 同步方法 */ private String inner_getSyncString(String url) { String result = null; try { /** * 把取得到的结果转为字符串,这里最好用string() */ result = inner_getSync(url).body().string(); } catch (IOException e) { e.printStackTrace(); } return result; } //-------------------------异步的方式请求数据-------------------------- public static void getAsync(Context context,String url, DataCallBack callBack) { getInstance(context).inner_getAsync(url, callBack); } /** * 内部逻辑请求的方法 * * @param url * @param callBack * @return */ private void inner_getAsync(String url, final DataCallBack callBack) { final Request request = new Request.Builder().url(url).build(); mClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { deliverDataFailure(request, e, callBack); } @Override public void onResponse(Call call, Response response) throws IOException { String result = null; try { result = response.body().string(); } catch (IOException e) { deliverDataFailure(request, e, callBack); } deliverDataSuccess(result, callBack); } }); } /** * 分发失败的时候调用 * * @param request * @param e * @param callBack */ private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) { /** * 在这里使用异步处理 */ mHandler.post(new Runnable() { @Override public void run() { if (callBack != null) { callBack.requestFailure(request, e); } } }); } /** * 分发成功的时候调用 * * @param result * @param callBack */ private void deliverDataSuccess(final String result, final DataCallBack callBack) { /** * 在这里使用异步线程处理 */ mHandler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.requestSuccess(result); } catch (Exception e) { e.printStackTrace(); } } } }); } /** * 数据回调接口 */ public interface DataCallBack { void requestFailure(Request request, IOException e); void requestSuccess(String result) throws Exception; } //-------------------------提交表单-------------------------- public static void postAsync(Context context,String url, Map<String, String> params, DataCallBack callBack) { getInstance(context).inner_postAsync(url, params, callBack); } private void inner_postAsync(String url, Map<String, String> params, final DataCallBack callBack) { RequestBody requestBody = null; if (params == null) { params = new HashMap<>(); } /** * 如果是3.0之前版本的,构建表单数据是下面的一句 */ //FormEncodingBuilder builder = new FormEncodingBuilder(); /** * 3.0之后版本 */ FormBody.Builder builder = new FormBody.Builder(); /** * 在这对添加的参数进行遍历,map遍历有四种方式,如果想要了解的可以网上查找 */ for (Map.Entry<String, String> map : params.entrySet()) { String key = map.getKey().toString(); String value = null; /** * 判断值是否是空的 */ if (map.getValue() == null) { value = ""; } else { value = map.getValue(); } /** * 把key和value添加到formbody中 */ builder.add(key, value); } requestBody = builder.build(); //结果返回 // 请求对象 final Request request = new Request.Builder().url(url).post(requestBody).build(); mClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { deliverDataFailure(request, e, callBack); } @Override public void onResponse(Call call, Response response) throws IOException { String result = response.body().string(); deliverDataSuccess(result, callBack); } }); } //-------------------------文件下载-------------------------- public static void downloadAsync(Context context,String url, String desDir, DataCallBack callBack) { getInstance(context).inner_downloadAsync(url, desDir, callBack); } /** * 下载文件的内部逻辑处理类 * * @param url 下载地址 * @param desDir 目标地址 * @param callBack */ private void inner_downloadAsync(final String url, final String desDir, final DataCallBack callBack) { final Request request = new Request.Builder().url(url).build(); mClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { deliverDataFailure(request, e, callBack); } @Override public void onResponse(Call call, Response response) throws IOException { /** * 在这里进行文件的下载处理 */ InputStream inputStream = null; FileOutputStream fileOutputStream = null; try { //文件名和目标地址 File file = new File(desDir, getFileName(url)); //把请求回来的response对象装换为字节流 inputStream = response.body().byteStream(); fileOutputStream = new FileOutputStream(file); int len = 0; byte[] bytes = new byte[2048]; //循环读取数据 while ((len = inputStream.read(bytes)) != -1) { fileOutputStream.write(bytes, 0, len); } //关闭文件输出流 fileOutputStream.flush(); //调用分发数据成功的方法 deliverDataSuccess(file.getAbsolutePath(), callBack); } catch (IOException e) { //如果失败,调用此方法 deliverDataFailure(request, e, callBack); e.printStackTrace(); } finally { if (inputStream != null) { inputStream.close(); } if (fileOutputStream != null) { fileOutputStream.close(); } } } }); } /** * 根据文件url获取文件的路径名字 * * @param url * @return */ private String getFileName(String url) { int separatorIndex = url.lastIndexOf("/"); String path = (separatorIndex < 0) ? url : url.substring(separatorIndex + 1, url.length()); return path; } }
使用举例:
/** * 检查是商品还是订单号 * */ public void checkOrder(final String code){ String url = "url"; OkHttp.getAsync(this, url, new OkHttp.DataCallBack() { @Override public void requestFailure(Request request, IOException e) { } @Override public void requestSuccess(String result) throws Exception { int res = Integer.parseInt(result); if (res == 1){ cancelTimer(); //商品、执行自助收银流程 Intent intent = new Intent(MainActivity.this,ZZProActivity.class); intent.putExtra("code",code); startActivityForResult(intent, REQUEST_CODE); }else { //订单号、走扫码购流程 getData(code); } } }); }