前言
此篇博客只是下载功能的记录demo,如果你还不太了解okhttp可以参考我的另一篇博客 https://www.cnblogs.com/guanxinjing/p/9708575.html
代码部分
package okhttpdemo.com.libs.net.httpBase; import android.util.Log; import org.json.JSONObject; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.RandomAccessFile; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import okhttp3.Call; import okhttp3.Callback; import okhttp3.FormBody; import okhttp3.MediaType; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; import okhttp3.ResponseBody; import okhttpdemo.com.libs.net.httpBase.listener.HttpDownListener; /** *@content: okhttp的下载功能工具类 (分别包含：1.无断点续传的get下载 2.有断点续传的get下载 3.无断点续传的post下载 4.有断点续传的post下载) *@time:2018-12-12 *@build:z */ public class OkHttpDownUtil { private static final String TAG = "OkHttpDownUtil"; private Call mCall; private long mAlreadyDownLength = 0;//已经下载长度 private long mTotalLength = 0;//整体文件大小 private int mSign = 0; //标记当前运行的是那个方法 private String mDownUrl;//下载网络地址 private File mPath;//文件保存路径 private JSONObject mJson; private HttpDownListener mHttpDownListener;//下载进度接口回调 /** * 没有断点续传功能的get请求下载 * @param downUrl 下载网络地址 * @param saveFilePathAndName 保存路径 */ public void getDownRequest(final String downUrl, final File saveFilePathAndName, final HttpDownListener listener) { mSign = 1; mDownUrl = downUrl; mPath = saveFilePathAndName; mHttpDownListener = listener; mAlreadyDownLength = 0; Request request = new Request.Builder() .url(mDownUrl) .get() .build(); mCall = OkHttpClientCreate.CreateClient().newCall(request);//构建了一个完整的http请求 mCall.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { if (mHttpDownListener != null) { mHttpDownListener.onFailure(call, e); } } @Override public void onResponse(Call call, Response response) throws IOException { ResponseBody responseBody = response.body(); mTotalLength = responseBody.contentLength();//下载文件的总长度 InputStream inp = responseBody.byteStream(); FileOutputStream fileOutputStream = new FileOutputStream(mPath); try { byte[] bytes = new byte[2048]; int len = 0; while ((len = inp.read(bytes)) != -1) { mAlreadyDownLength = mAlreadyDownLength + len; fileOutputStream.write(bytes, 0, len); if (mHttpDownListener != null) { mHttpDownListener.onResponse(call, response, mTotalLength, mAlreadyDownLength); } } } catch (Exception e) { Log.e(TAG, "Get下载异常"); } finally { fileOutputStream.close(); inp.close(); Log.e(TAG, "流关闭"); } } }); } /** * 有断点续传功能的get下载 * @param downUrl 下载地址 * @param saveFilePathAndName 保存路径 * @param listener 进度监听 */ public void getRenewalDownRequest(final String downUrl, final File saveFilePathAndName, final HttpDownListener listener){ mSign = 2; mDownUrl = downUrl; mPath = saveFilePathAndName; mHttpDownListener = listener; Request request = new Request.Builder() .url(mDownUrl) .header("RANGE", "bytes=" + mAlreadyDownLength + "-") .build(); mCall = OkHttpClientCreate.CreateClient().newCall(request);//构建了一个完整的http请求 mCall.enqueue(new Callback() { //发送请求 @Override public void onFailure(Call call, IOException e) { if (mHttpDownListener != null) { mHttpDownListener.onFailure(call, e); } Log.e(TAG, "onFailure: 异常报错=" + e.toString()); } @Override public void onResponse(Call call, Response response) throws IOException { ResponseBody responseBody = response.body(); InputStream inputStream = responseBody.byteStream();//得到输入流 RandomAccessFile randomAccessFile = new RandomAccessFile(mPath, "rw");//得到任意保存文件处理类实例 if (mTotalLength == 0){ mTotalLength = responseBody.contentLength();//得到文件的总字节大小 randomAccessFile.setLength(mTotalLength);//预设创建一个总字节的占位文件 } if (mAlreadyDownLength != 0){ randomAccessFile.seek(mAlreadyDownLength); } byte[] bytes = new byte[2048]; int len = 0; try { while ((len = inputStream.read(bytes)) != -1) { randomAccessFile.write(bytes,0,len); mAlreadyDownLength = mAlreadyDownLength + len; if (mHttpDownListener != null) { mHttpDownListener.onResponse(call, response, mTotalLength, mAlreadyDownLength); } } } catch (Exception e) { Log.e(TAG, "Get下载异常"); } finally { mAlreadyDownLength = randomAccessFile.getFilePointer();//记录当前保存文件的位置 randomAccessFile.close(); inputStream.close(); Log.e(TAG, "流关闭 下载的位置="+mAlreadyDownLength); } } }); } /** * 没有断点续传的post下载 * @param downUrl * @param saveFilePathAndName * @param json * @param listener */ public void postDownRequest(final String downUrl, final File saveFilePathAndName, final JSONObject json,final HttpDownListener listener){ mSign = 3; mDownUrl = downUrl; mPath = saveFilePathAndName; mJson = json; mHttpDownListener = listener; mAlreadyDownLength = 0; Request request = new Request.Builder() .url(mDownUrl) .post(changeJSON(json)) .build(); mCall = OkHttpClientCreate.CreateClient().newCall(request); mCall.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { if (mHttpDownListener!=null){ mHttpDownListener.onFailure(call,e); } } @Override public void onResponse(Call call, Response response) throws IOException { ResponseBody responseBody = response.body(); mTotalLength = responseBody.contentLength(); InputStream inputStream = responseBody.byteStream(); FileOutputStream fileOutputStream = new FileOutputStream(mPath); byte[] bytes = new byte[2048]; int len = 0; try { while ((len = inputStream.read(bytes)) != -1) { fileOutputStream.write(bytes, 0, len); mAlreadyDownLength = mAlreadyDownLength + len; if (mHttpDownListener != null) { mHttpDownListener.onResponse(call, response, mTotalLength, mAlreadyDownLength); } } }catch (Exception e){ Log.e(TAG, "Post下载异常"); }finally { fileOutputStream.close(); inputStream.close(); Log.e(TAG, "流关闭"); } } }); } /** * 支持断点续传的post下载 * @param downUrl 下载网址 * @param saveFilePathAndName 文件保存路径 * @param json 参数 * @param listener 接口回调 */ public void postRenewalDownRequest(final String downUrl, final File saveFilePathAndName, final JSONObject json, final HttpDownListener listener){ mSign = 4; mDownUrl = downUrl; mPath = saveFilePathAndName; mJson = json; mHttpDownListener = listener; Request request = new Request.Builder() .url(mDownUrl) .header("RANGE","bytes="+mAlreadyDownLength+"-") .post(changeJSON(json)) .build(); mCall = OkHttpClientCreate.CreateClient().newCall(request); mCall.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { if (mHttpDownListener != null){ mHttpDownListener.onFailure(call,e); } } @Override public void onResponse(Call call, Response response) throws IOException { ResponseBody responseBody = response.body(); InputStream inputStream = responseBody.byteStream(); RandomAccessFile randomAccessFile = new RandomAccessFile(mPath,"rw"); if (mTotalLength == 0){ mTotalLength = responseBody.contentLength(); randomAccessFile.setLength(mTotalLength); } if (mAlreadyDownLength!=0){ randomAccessFile.seek(mAlreadyDownLength); } byte[] bytes = new byte[2048]; int len = 0; try { while ((len = inputStream.read(bytes)) != -1) { randomAccessFile.write(bytes, 0, len); mAlreadyDownLength = mAlreadyDownLength + len; if (mHttpDownListener != null) { mHttpDownListener.onResponse(call, response, mTotalLength, mAlreadyDownLength); } } }catch (Exception e){ Log.e(TAG, "Post下载异常"); }finally { mAlreadyDownLength = randomAccessFile.getFilePointer(); randomAccessFile.close(); inputStream.close(); Log.e(TAG, "流关闭 下载的位置="+mAlreadyDownLength); } } }); } /** * 恢复下载 */ public void resume(){ if (mSign==0){ return; } switch (mSign){ case 1: getDownRequest(mDownUrl,mPath,mHttpDownListener); break; case 2: getRenewalDownRequest(mDownUrl,mPath,mHttpDownListener); break; case 3: postDownRequest(mDownUrl,mPath,mJson,mHttpDownListener); break; case 4: postRenewalDownRequest(mDownUrl,mPath,mJson,mHttpDownListener); break; default: break; } } /** * 暂停下载 */ public void stop(){ if (mCall!=null){ mCall.cancel(); } } /** * 删除下载文件 */ public void deleteCurrentFile(){ if (mPath == null){ Log.e(TAG, "deleteCurrentFile error : 没有路径"); return; } if (!mPath.exists()){ Log.e(TAG, "deleteCurrentFile error: 文件不存在"); return; } mPath.delete(); mAlreadyDownLength = 0; mTotalLength = 0; mSign = 0; } /** * 销毁 */ public void destroy(){ if (mCall!=null){ mCall.cancel(); mCall = null; } mSign = 0; mDownUrl = null; mPath = null; mHttpDownListener = null; mAlreadyDownLength = 0; mTotalLength = 0; } /** * 转换Json参数为RequestBody * @param jsonParam json对象 * @return RequestBody */ private RequestBody changeJSON(JSONObject jsonParam){ RequestBody requestBody = FormBody.create(MediaType.parse("application/json; charset=utf-8") , String.valueOf(jsonParam)); return requestBody; } }