使用httpclient实现上传下载(javaWeb系统数据传输http实现)
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目的:项目被拆分为两个javaWeb项目,实现项目之间数据传输以及上传、下载功能。
前台展示项目A,后台提供数据支持项目B
题外话:
两个javaWeb传输之间使用json比较方便,如果恰好使用SpringMVC,配置相关JSON转换工具(功能很强大非常好用),在@Controller层
加上@ResponseBody自动将返回值转化成json格式
<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"><mvc:message-converters register-defaults="true"><!-- 将StringHttpMessageConverter的默认编码设为UTF-8 --><bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8" /></bean><!-- 将Jackson2HttpMessageConverter的默认格式化输出设为true --><bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="prettyPrint" value="true"/> <property name="objectMapper"> <bean class="com.fasterxml.jackson.databind.ObjectMapper"> <property name="dateFormat"> <bean class="java.text.SimpleDateFormat"> <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" /> </bean> </property> </bean> </property> </bean> </mvc:message-converters></mvc:annotation-driven><!-- REST中根据URL后缀自动判定Content-Type及相应的View --><bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean"> <property name="ignoreAcceptHeader" value="true" /> <property name="defaultContentType" value="application/json" /> <property name="mediaTypes" > <value> json=application/json xml=application/xml </value> </property></bean><!-- jsp配置视图解析 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/page/"/><property name="suffix" value=".jsp"/></bean>
进入正题:
上传代码: A调用上传工具类(最头疼的问题就是文件名乱码)
/** * 文件上传 * @param is * @param fileName * @param url * @return */ public static String uploadFile(InputStream is ,String fileName ,String url){ String result = null; HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); //防止文件名乱码 InputStreamBody fileis = new InputStreamBody(is,ContentType.create("text/plain", Consts.UTF_8),fileName); HttpEntity reqEntity = null; HttpResponse responses = null; try { //BROWSER_COMPATIBLE 设置浏览器为兼容模式 随便设置编码防止乱码 reqEntity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE) .addPart("Filedata", fileis).setCharset(CharsetUtils.get("utf-8")).build(); httppost.setEntity(reqEntity); // 如果需要登陆加上sessionId httppost.addHeader(new BasicHeader("Cookie", "sessionId=" + clientUser.getSessionId())); responses = httpclient.execute(httppost); HttpEntity entity = responses.getEntity(); if(entity != null){ result = EntityUtils.toString(entity, Charset.forName("utf-8")); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; }
B使用SpringMvc方便得到传入的文件。
@RequestMapping(value="/upload",method=RequestMethod.POST)@ResponseBodypublic ModelMap upload(MultipartRequest request){ModelMap model = new ModelMap();MultipartFile file = request.getFile("Filedata");String realName= null;realName = new Date().getTime() + "_" +file.getOriginalFilename();File targetFile = new File(UPLOAD_PATH, realName);if (!targetFile.exists()) {targetFile.mkdirs();} //生成文件<pre name="code" class="java"> file.transferTo(targetFile);return model;}------------------------------------------------------------------------------------
下载
A调用下载 上代码
/** * 文件下载 * @param url * @param fileName * @return */public static InputStream fileDownload(String url,String fileName){CloseableHttpClient httpclient = new HttpUtils().buildHttpClient();HttpPost httppost = new HttpPost(url);StringEntity sEntity = new StringEntity(fileName, Charset.forName("utf-8"));//BasicNameValuePair basicNameValuePair = new BasicNameValuePair("fileName",fileName);//List<NameValuePair> list = new ArrayList<NameValuePair>(); //list.add(basicNameValuePair);//UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list, Charset.forName("utf-8"));// httppost.setEntity(formEntity);httppost.setEntity(sEntity);httppost.addHeader(new BasicHeader("Cookie", "sessionId=" + clientUser.getSessionId()));httppost.addHeader("Content-Type", "application/xml;charset=utf-8");try {CloseableHttpResponse responses = httpclient.execute(httppost);HttpEntity entity = responses.getEntity();InputStream content = entity.getContent();return content;} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}
B服务端代码:屏蔽了response.set部分代码,不然会报一个奇怪的错,无法解决。
@RequestMapping(value="/fileDownload",method=RequestMethod.POST) @ResponseBody public void fileDownload(HttpServletRequest request,HttpServletResponse response){ // getXmlContent获取流传输的文件名,当然也可以使用request.getAttribute获取文件名,需要httpclient做一些设置 String fileName = getXmlContent(request).trim(); System.out.println("开始下载文件....." + fileName); try { File file = new File(DOWNLOAD_PATH + fileName); if(!file.exists() || !file.isFile()){ System.out.println("文件不存在。。" + fileName ); return; } //response.setCharacterEncoding("utf-8"); //response.setContentType("multipart/form-data"); //response.setHeader("Content-Disposition", "attachment;fileName=" + fileName); InputStream inputStream = new FileInputStream(file); OutputStream os = response.getOutputStream(); byte[] b = new byte[1024]; int length; while ((length = inputStream.read(b)) > 0) { os.write(b, 0, length); }// Long filelength = file.length();// byte[] b = new byte[filelength.intValue()];// inputStream.read(b);// os.write(b, 0, filelength.intValue()); inputStream.close(); } catch (Exception ex) { ex.printStackTrace(); } }
如果服务端A的下载文件为中文名,需要转码
try {fileName = new String(fileName.getBytes("iso8859-1"),"UTF-8");} catch (UnsupportedEncodingException e1) {e1.printStackTrace();}
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