在之前一段的项目中，使用Java模仿Http Post方式发送参数以及文件，单纯的传递参数或者文件可以使用URLConnection进行相应的处理。

但是项目中涉及到既要传递普通参数，也要传递多个文件（不是单纯的传递XML文件）。在网上寻找之后，发现是使用HttClient来进行响应的操作，起初尝试多次依然不能传递参数和传递文件，后来发现时因为当使用HttpClient时，不能使用request.getParameter()对普通参数进行获取，而要在服务器端使用Upload来进行操作。

HttpClient4.2 jar下载 ：http://download.csdn.net/detail/just_szl/4370574

客户端代码：

import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.ParseException; 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.impl.client.DefaultHttpClient; import org.apache.http.util.EntityUtils; /** * * @author <a href="mailto:just_szl@hotmail.com"> Geray</a> * @version 1.0,2012-6-12 */ public class HttpPostArgumentTest2 { //file1与file2在同一个文件夹下 filepath是该文件夹指定的路径 public void SubmitPost(String url,String filename1,String filename2, String filepath){ HttpClient httpclient = new DefaultHttpClient(); try { HttpPost httppost = new HttpPost(url); FileBody bin = new FileBody(new File(filepath + File.separator + filename1)); FileBody bin2 = new FileBody(new File(filepath + File.separator + filename2)); StringBody comment = new StringBody(filename1); MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("file1", bin);//file1为请求后台的File upload;属性 reqEntity.addPart("file2", bin2);//file2为请求后台的File upload;属性 reqEntity.addPart("filename1", comment);//filename1为请求后台的普通参数;属性 httppost.setEntity(reqEntity); HttpResponse response = httpclient.execute(httppost); int statusCode = response.getStatusLine().getStatusCode(); if(statusCode == HttpStatus.SC_OK){ System.out.println("服务器正常响应....."); HttpEntity resEntity = response.getEntity(); System.out.println(EntityUtils.toString(resEntity));//httpclient自带的工具类读取返回数据 System.out.println(resEntity.getContent()); EntityUtils.consume(resEntity); } } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { httpclient.getConnectionManager().shutdown(); } catch (Exception ignore) { } } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub HttpPostArgumentTest2 httpPostArgumentTest2 = new HttpPostArgumentTest2(); httpPostArgumentTest2.SubmitPost("http://127.0.0.1:8080/demo/receiveData.do", "test.xml","test.zip","D://test"); } }

服务端代码：

public void receiveData(HttpServletRequest request, HttpServletResponse response) throws AppException{ PrintWriter out = null; response.setContentType("text/html;charset=UTF-8"); Map map = new HashMap(); FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); File directory = null; List<FileItem> items = new ArrayList(); try { items = upload.parseRequest(request); // 得到所有的文件 Iterator<FileItem> it = items.iterator(); while (it.hasNext()) { FileItem fItem = (FileItem) it.next(); String fName = ""; Object fValue = null; if (fItem.isFormField()) { // 普通文本框的值 fName = fItem.getFieldName(); // fValue = fItem.getString(); fValue = fItem.getString("UTF-8"); map.put(fName, fValue); } else { // 获取上传文件的值 fName = fItem.getFieldName(); fValue = fItem.getInputStream(); map.put(fName, fValue); String name = fItem.getName(); if(name != null && !("".equals(name))) { name = name.substring(name.lastIndexOf(File.separator) + 1); // String stamp = StringUtils.getFormattedCurrDateNumberString(); String timestamp_Str = TimeUtils.getCurrYearYYYY(); directory = new File("d://test"); directory.mkdirs(); String filePath = ("d://test")+ timestamp_Str+ File.separator + name; map.put(fName + "FilePath", filePath); InputStream is = fItem.getInputStream(); FileOutputStream fos = new FileOutputStream(filePath); byte[] buffer = new byte[1024]; while (is.read(buffer) > 0) { fos.write(buffer, 0, buffer.length); } fos.flush(); fos.close(); map.put(fName + "FileName", name); } } } } catch (Exception e) { System.out.println("读取http请求属性值出错!"); // e.printStackTrace(); logger.error("读取http请求属性值出错"); } // 数据处理 try { out = response.getWriter(); out.print("{success:true, msg:'接收成功'}"); out.close(); } catch (IOException e) { e.printStackTrace(); } }

以上所述是小编给大家介绍的HttpClient通过Post上传文件的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！