OkHttp实现文件上传进度

文件上传就一个没刻度的进度条在那里转怎么行，本篇带你实现上传进度，为你的进度条添加刻度吧，啥都不说了，重点重写RequestBody，看代码

import com.squareup.okhttp.*;
import okio.Buffer;
import okio.BufferedSink;
import okio.Okio;
import okio.Source;

import java.io.File;
import java.io.IOException;

public class ProgressUploadFile {
    private static final OkHttpClient okHttpClient = new OkHttpClient();

    private void run() {

        MultipartBuilder builder = new MultipartBuilder().type(MultipartBuilder.FORM);

        File file = new File("D:\\file.jpg");
        builder.addFormDataPart("file", file.getName(), createCustomRequestBody(MultipartBuilder.FORM, file, new ProgressListener() {
            @Override public void onProgress(long totalBytes, long remainingBytes, boolean done) {
                System.out.print((totalBytes - remainingBytes) *  / totalBytes + "%");
            }
        }));

        RequestBody requestBody = builder.build();

        Request request = new Request.Builder()
                .url("http://localhost:8080/upload") //地址
                .post(requestBody)
                .build();

        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override public void onFailure(Request request, IOException e) {

            }

            @Override public void onResponse(Response response) throws IOException {
                System.out.println("response.body().string() = " + response.body().string());

            }
        });
    }

    public static RequestBody createCustomRequestBody(final MediaType contentType, final File file, final ProgressListener listener) {
        return new RequestBody() {
            @Override public MediaType contentType() {
                return contentType;
            }

            @Override public long contentLength() {
                return file.length();
            }

            @Override public void writeTo(BufferedSink sink) throws IOException {
                Source source;
                try {
                    source = Okio.source(file);
                    //sink.writeAll(source);
                    Buffer buf = new Buffer();
                    Long remaining = contentLength();
                    for (long readCount; (readCount = source.read(buf, )) != -; ) {
                        sink.write(buf, readCount);
                        listener.onProgress(contentLength(), remaining -= readCount, remaining == );

                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
    }

    interface ProgressListener {
        void onProgress(long totalBytes, long remainingBytes, boolean done);
    }

    public static void main(String[] args) {
        new ProgressUploadFile().run();

    }

}

结果： 
0%0%1%1%1%2%2%3%3%3%4%4%4%5%5%6%6%6%7%7%7%8%8%9%9%9%10%10%10%11%11%12%12%12%13%13%13%14%14%15%15%15%16%16%16%17%17%18%18%18%19%19%19%20%20%21%21%21%22%22%23%23%23%24%24%24%25%25%26%26%26%27%27%27%28%28%29%29%29%30%30%30%31%31%32%32%32%33%33%33%34%34%35%35%35%36%36%36%37%37%38%38%38%39%39%39%40%40%41%41%41%42%42%43%43%43%44%44%44%45%45%46%46%46%47%47%47%48%48%49%49%49%50%50%50%51%51%52%52%52%53%53%53%54%54%55%55%55%56%56%56%57%57%58%58%58%59%59%59%60%60%61%61%61%62%62%62%63%63%64%64%64%65%65%66%66%66%67%67%67%68%68%69%69%69%70%70%70%71%71%72%72%72%73%73%73%74%74%75%75%75%76%76%76%77%77%78%78%78%79%79%79%80%80%81%81%81%82%82%82%83%83%84%84%84%85%85%86%86%86%87%87%87%88%88%89%89%89%90%90%90%91%91%92%92%92%93%93%93%94%94%95%95%95%96%96%96%97%97%98%98%98%99%99%99%100%

response.body().string() = You successfully uploaded file.jpg ! 
Process finished with exit code 0