httpclient4 如何模拟表单提交文件

Question

httpclient4与以前的代码相比改变了不少，以前的例子已经不能用了，我想知道如何通过HttpClient4来提交带有文件的表单：

<form action="127.0.0.1/up.php" method="post" enctype="multipart/form-data">
<input type="text" name="filename">
<input type="file" name="file">
<input type="submit" name="t" value="提交">
</form>

Answer 1

public static String upload(String url,File file) throws Exception{
	    CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpPost httpPost = new HttpPost(url);
		FileBody fileb = new FileBody(file);
		HttpEntity entity = MultipartEntityBuilder.create()
		           .addPart("file", fileb)
		           .build();
		
		httpPost.setEntity(entity);
		CloseableHttpResponse reponse = httpClient.execute(httpPost);
		return EntityUtils.toString(reponse.getEntity());
	}

此为  4.3.5 版本方法

Answer 2

使用MultipartEntity即可完成相应的代码如下

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;


public class PostFile {
  public static void main(String[] args) throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

    HttpPost httppost = new HttpPost("http://localhost:9001/upload.php");
    File file = new File("c:/TRASH/zaba_1.jpg");

    MultipartEntity mpEntity = new MultipartEntity();
    ContentBody cbFile = new FileBody(file, "image/jpeg");
    mpEntity.addPart("userfile", cbFile);


    httppost.setEntity(mpEntity);
    System.out.println("executing request " + httppost.getRequestLine());
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity resEntity = response.getEntity();

    System.out.println(response.getStatusLine());
    if (resEntity != null) {
      System.out.println(EntityUtils.toString(resEntity));
    }
    if (resEntity != null) {
      resEntity.consumeContent();
    }

    httpclient.getConnectionManager().shutdown();
  }
}