Java HttpClient和上载进度-缺少ProgressListener

我看了HttpClient进度代码，但仍然有一些问题找不到答案 从何处获取此ProgressListener以放置构造函数参数？如何正确使用代码？请帮忙

这是密码

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;

public class CountingMultipartEntity extends MultipartEntity {

    private final ProgressListener listener;

    public CountingMultipartEntity(final ProgressListener listener) {
        super();
        this.listener = listener;
    }

    public CountingMultipartEntity(final HttpMultipartMode mode, final ProgressListener listener) {
        super(mode);
        this.listener = listener;
    }

    public CountingMultipartEntity(HttpMultipartMode mode, final String boundary,
            final Charset charset, final ProgressListener listener) {
        super(mode, boundary, charset);
        this.listener = listener;
    }

    @Override
    public void writeTo(final OutputStream outstream) throws IOException {
        super.writeTo(new CountingOutputStream(outstream, this.listener));
    }

    public static interface ProgressListener {
        void transferred(long num);
    }

    public static class CountingOutputStream extends FilterOutputStream {

        private final ProgressListener listener;
        private long transferred;

        public CountingOutputStream(final OutputStream out,
                final ProgressListener listener) {
            super(out);
            this.listener = listener;
            this.transferred = 0;
        }


        public void write(byte[] b, int off, int len) throws IOException {
            out.write(b, off, len);
            this.transferred += len;
            this.listener.transferred(this.transferred);
        }

        public void write(int b) throws IOException {
            out.write(b);
            this.transferred++;
            this.listener.transferred(this.transferred);
        }
    }
}

---

我可以这样实现接口吗

...
public static interface ProgressListener {
        void transferred(long num);
    }
    public static class Progress implements ProgressListener
    {

      public void transferred(long num) {
//            // update the progress bar or whatever else you might want to do

        }

    }
...

但是，对于这个包含HttpClient的外部类，我如何初始化ProgressListener呢

CountingMultiPartEntity entity = new CountingMultiPartEntity(new ProgressListener() {

        public void transferred(long num) {
            // update the progress bar or whatever else you might want to do
        }
    });

---

如果您还没有任何类来实现

ProgressListener

接口，那么您需要自己构造该接口的实现。对于侦听器之类的对象，这通常是通过匿名内部类完成的

CountingMultipartEntity entity = new CountingMultipartEntity(new ProgressListener() {
    @Override
    public void transferred(long num) {
        // update the progress bar or whatever else you might want to do
    }
});

---

您应该将ProgressListener导入到要调用的类中

import com.blahblah.YourProjectName.CustomMultipartEntity.ProgressListener;

我正在使用一个名为“CustomMultipartEntity”的类似类，不要忘记更改它的名称

CustomMultipartEntity类实现为：

package com.blahblah.YourProjectName;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
public class CustomMultipartEntity extends MultipartEntity
{


private final ProgressListener listener;

public CustomMultipartEntity(final ProgressListener listener)
{
    super();
    this.listener = listener;
}

public CustomMultipartEntity(final HttpMultipartMode mode, final ProgressListener listener)
{
    super(mode);
    this.listener = listener;
}

public CustomMultipartEntity(HttpMultipartMode mode, final String boundary, final Charset charset, final ProgressListener listener)
{
    super(mode, boundary, charset);
    this.listener = listener;
}

@Override
public void writeTo(final OutputStream outstream) throws IOException
{
    super.writeTo(new CountingOutputStream(outstream, this.listener));
}

public static interface ProgressListener
{
    void transferred(long num);
}

public static class CountingOutputStream extends FilterOutputStream
{

    private final ProgressListener listener;
    private long transferred;

    public CountingOutputStream(final OutputStream out, final ProgressListener listener)
    {
        super(out);
        this.listener = listener;
        this.transferred = 0;
    }

    public void write(byte[] b, int off, int len) throws IOException
    {
        out.write(b, off, len);
        this.transferred += len;
        this.listener.transferred(this.transferred);
    }

    public void write(int b) throws IOException
    {
        out.write(b);
        this.transferred++;
        this.listener.transferred(this.transferred);
    }
}
}

这是一个示例调用：

CustomMultipartEntity reqEntity = new CustomMultipartEntity(new ProgressListener() {

                    public void transferred(long num) {
                        if((int) ((num / (float) totalSize) * 100) > 0)
                            progressHandler(num);
                    }
                });

---

我想知道这个监听器是什么？因为我得到了fileNotFound:（我有HttpClient 4，HttpMultipartMode mode参数对于HttpClient意味着什么？“如果您还没有实现ProgressListener接口的任何类，您需要自己构造它的实现。对于监听器之类的东西，这通常是通过匿名内部类来完成的。”我没有接口实现：（我从来没有在这个领域看到过任何示例。你能告诉我吗？请告诉我如何构造ProgressListener实现，因为我对代码样式感到困惑：（ProgressListener是一个内部接口，所以我可以把它变成一个外部接口吗？我不明白……你在你发布的代码中已经有了

ProgressListener

接口的定义。你可以使用普通的独立类、命名的内部类或匿名的内部类来实现它。关于usi的文章很多要了解这些，请参阅任何关于向Swing组件添加事件侦听器的文章