import java.io.File;

import java.io.IOException;

import java.nio.charset.Charset;

import org.apache.http.Consts;

import org.apache.http.HttpEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.ContentType;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.entity.mime.content.StringBody;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.CharsetUtils;

import org.apache.http.util.EntityUtils;

public class FileUploadTest {

    /**

     * 这个例子展示了如何执行请求包含一个多部分编码的实体 模拟表单提交

     *

     * @throws IOException

     */

    public static void main(String[] args) throws IOException {

        CloseableHttpClient httpClient = HttpClients.createDefault();

        try {

            // 要上传的文件的路径

            String filePath = new String("D:\\吹风.gif");

            // 把一个普通参数和文件上传给下面这个地址 是一个servlet

            HttpPost httpPost = new HttpPost(

                    "http://localhost:8080/abc/updateUserBgImg");

            // 把文件转换成流对象FileBody

            File file = new File(filePath);

            FileBody bin = new FileBody(file);

            StringBody userId = new StringBody(

                    "用户ID", ContentType.create(

                            "text/plain", Consts.UTF_8));
            //以浏览器兼容模式运行，防止文件名乱码。  

            HttpEntity reqEntity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE)

                    .addPart("multipartFile", bin)

                    .addPart("userId", userId).setCharset(CharsetUtils.get("UTF-8")).build();

            httpPost.setEntity(reqEntity);

            System.out.println("发起请求的页面地址 " + httpPost.getRequestLine());

            // 发起请求 并返回请求的响应

            CloseableHttpResponse response = httpClient.execute(httpPost);

            try {

                System.out.println("----------------------------------------");

                // 打印响应状态

                System.out.println(response.getStatusLine());

                // 获取响应对象

                HttpEntity resEntity = response.getEntity();

                if (resEntity != null) {

                    // 打印响应长度

                    System.out.println("Response content length: "

                            + resEntity.getContentLength());

                    // 打印响应内容

                    System.out.println(EntityUtils.toString(resEntity,

                            Charset.forName("UTF-8")));

                }

                // 销毁

                EntityUtils.consume(resEntity);

            } finally {

                response.close();

            }

        } finally {

            httpClient.close();

        }

    }

}