HttpClient 4 - 文件上传

httpclient上传文件实际上就是模拟一个http的表单提交请求。

package test.httpclient4;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
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.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

public class SendFile {

	public static void main(String[] args) throws ClientProtocolException,
			IOException {
		HttpClient httpclient = new DefaultHttpClient();
		//请求处理页面
		HttpPost httppost = new HttpPost(
				"http://localhost:8080/webtools/upload.jsp");
		//创建待处理的文件
		FileBody file = new FileBody(new File("d:/22.rar"));
		//创建待处理的表单域内容文本
		StringBody descript = new StringBody("0431.la");

		//对请求的表单域进行填充
		MultipartEntity reqEntity = new MultipartEntity();
		reqEntity.addPart("file", file);
		reqEntity.addPart("descript", descript);
		//设置请求
		httppost.setEntity(reqEntity);
		//执行
		HttpResponse response = httpclient.execute(httppost);
		//HttpEntity resEntity = response.getEntity();
		//System.out.println(response.getStatusLine());
		if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){
			HttpEntity entity = response.getEntity();
			//显示内容
			if (entity != null) {
				System.out.println(EntityUtils.toString(entity));
			}
			if (entity != null) {
				entity.consumeContent();
			}
		}
	}
}

 这里说明一下 需要一个额外的包，apache 的mime4j 的lib。