httpClient 向微信服务器上传临时图片素材

来源：互联网发布：淘宝和微店哪个好编辑：程序博客网时间：2024/06/05 21:15

利用httpClient向微信上传临时图片素材，HttpClient有ByteArrayBody、FileBody、InputStreamBody和StringBody四种Body。其中已经用到的有除ByteArrayBody之前的三种。FileBody和StringBody请参考httpClient的官方例子，很好理解。http://hc.apache.org/httpcomponents-client-4.5.x/httpmime/examples/org/apache/http/examples/entity/mime/ClientMultipartFormPost.java 。

但是用InputStreamBody的时候，官方没有具体给出例子。所以我就照葫芦画瓢写了，但是向微信服务器上传的时候老是超时也不报错，设置client的超时时间也没什么用。纠结了好长时间再加上谷歌，终于找到了两种解决办法。

1、第一种就是把上传的inputStream先转成文件，在用FileBody上传。

       File fout = new File("D:\\aa.jpg");        OutputStream os = new FileOutputStream(fout);        int bytesRead = 0;        byte[] buffer = new byte[8192];        while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {         os.write(buffer, 0, bytesRead);        }        os.close();        in.close();         FileBody bin = new FileBody(fout);

2、第二种就是自己实现InputStreamBody，因为我发现FileBody和StringBody上传过程中的ContentLength都是文件的长度，但是InputStreamBody的源码里面获得ContentLength的长度永远是-1，可能就是这个原因让微信识别不了。然后我就自己实现了InputStreamBody。最后终于上传成功了，但是这两种方法本质上没什么区别。

package com.liuxl.httpclient;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import org.apache.http.entity.ContentType;import org.apache.http.entity.mime.MIME;import org.apache.http.entity.mime.content.AbstractContentBody;import org.apache.http.util.Args;public class InputStreamBody extends AbstractContentBody{private final InputStream in;    private final String filename;    private long length;    public InputStreamBody(final InputStream in, long length, final String filename, ContentType contentType) {        super(contentType);        if (in == null) {            throw new IllegalArgumentException("Input stream may not be null");        }        this.in = in;        this.filename = filename;        this.length = length;    }    public InputStreamBody(final InputStream in, long length, final String filename) {        this(in, length, filename, ContentType.create("application/octet-stream"));    }    public InputStreamBody(final InputStream in, long length) {        this(in, length, "no_name", ContentType.create("application/octet-stream"));    }    public InputStream getInputStream() {        return this.in;    }    public void writeTo(final OutputStream out) throws IOException {     Args.notNull(out, "Output stream");        try {          byte[] tmp = new byte[4096];          int l;          while ((l = this.in.read(tmp)) != -1) {            out.write(tmp, 0, l);          }          out.flush();        } finally {          this.in.close();        }    }    public String getTransferEncoding() {        return MIME.ENC_BINARY;    }    public String getCharset() {        return null;    }    public long getContentLength() {        return this.length;    }    public String getFilename() {        return this.filename;    }}

File f = new File("D:\\a.jpg");InputStreamBody fileis = new InputStreamBody((InputStream)source,f.length(),f.getName());  mediaEntityBuilder = MultipartEntityBuilder.create().addPart("file",fileis);

最后我想说，还是谷歌好啊。0.0

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