httpclient 上传文件、下载文件

用httpclient4.3 post方式推送文件到服务端  
准备：httpclient-4.3.3.jar；httpcore-4.3.2.jar；httpmime-4.3.3.jar

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代码片段(1)[全屏查看所有代码]

1. [代码][Java]代码     

/**  * 上传文件  * @throws  ParseException  * @throws  IOException  */    publicstaticvoidpostFile()throwsParseException, IOException{     CloseableHttpClient httpClient = HttpClients.createDefault();     try{         // 要上传的文件的路径         String filePath =newString("F:/pic/001.jpg");         // 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 =newHttpPost(                 "http://localhost:8080/xxx/xxx.action");         // 把文件转换成流对象FileBody         File file =newFile(filePath);         FileBody bin =newFileBody(file);          StringBody uploadFileName =newStringBody(                 "把我修改成文件名称", 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("uploadFile", bin)//uploadFile对应服务端类的同名属性<File类型>                 .addPart("uploadFileName", uploadFileName)//uploadFileName对应服务端类的同名属性<String类型>                 .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();     } }    /**  * 下载文件  * @param  url  * @param  destFileName   xxx.jpg/xxx.png/xxx.txt  * @throws  ClientProtocolException  * @throws IOException  */ publicstaticvoidgetFile(String url, String destFileName)         throwsClientProtocolException, IOException {     // 生成一个httpclient对象     CloseableHttpClient httpclient = HttpClients.createDefault();     HttpGet httpget =newHttpGet(url);     HttpResponse response = httpclient.execute(httpget);     HttpEntity entity = response.getEntity();     InputStream in = entity.getContent();     File file =newFile(destFileName);     try{         FileOutputStream fout =newFileOutputStream(file);         intl = -1;         byte[] tmp =newbyte[1024];         while((l = in.read(tmp)) != -1) {             fout.write(tmp,0, l);             // 注意这里如果用OutputStream.write(buff)的话，图片会失真，大家可以试试         }         fout.flush();         fout.close();     }finally{         // 关闭低层流。         in.close();     }     httpclient.close(); }