Java实现表单提交（支持多文件同时上传）

package cn.com.ajava.util;import java.io.File;import java.io.Serializable;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.Map;import java.util.Map.Entry;import org.apache.http.Consts;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.ContentType;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.DefaultHttpClient;import org.apache.http.util.EntityUtils;/** * HttpClient工具类 *  * @author 曾繁添 * @version 1.0 */public class HttpClientUtil{ public final static String Method_POST = "POST"; public final static String Method_GET = "GET"; /**  * multipart/form-data类型的表单提交  *   * @param form  *   表单数据  */ public static String submitForm(MultipartForm form) {  // 返回字符串  String responseStr = "";  // 创建HttpClient实例  HttpClient httpClient = new DefaultHttpClient();  try  {   // 实例化提交请求   HttpPost httpPost = new HttpPost(form.getAction());   // 创建MultipartEntityBuilder   MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();   // 追加普通表单字段   Map<String, String> normalFieldMap = form.getNormalField();   for (Iterator<Entry<String, String>> iterator = normalFieldMap.entrySet().iterator(); iterator.hasNext();)   {    Entry<String, String> entity = iterator.next();    entityBuilder.addPart(entity.getKey(), new StringBody(entity.getValue(), ContentType.create("text/plain", Consts.UTF_8)));   }   // 追加文件字段   Map<String, File> fileFieldMap = form.getFileField();   for (Iterator<Entry<String, File>> iterator = fileFieldMap.entrySet().iterator(); iterator.hasNext();)   {    Entry<String, File> entity = iterator.next();    entityBuilder.addPart(entity.getKey(), new FileBody(entity.getValue()));   }   // 设置请求实体   httpPost.setEntity(entityBuilder.build());   // 发送请求   HttpResponse response = httpClient.execute(httpPost);   int statusCode = response.getStatusLine().getStatusCode();   // 取得响应数据   HttpEntity resEntity = response.getEntity();   if (200 == statusCode)   {    if (resEntity != null)    {     responseStr = EntityUtils.toString(resEntity);    }   }  } catch (Exception e)  {   System.out.println("提交表单失败，原因：" + e.getMessage());  } finally  {   httpClient.getConnectionManager().shutdown();  }  return responseStr; } /** 表单字段Bean */ public class MultipartForm implements Serializable {  /** 序列号 */  private static final long serialVersionUID = -2138044819190537198L;  /** 提交URL **/  private String action = "";  /** 提交方式：POST/GET **/  private String method = "POST";  /** 普通表单字段 **/  private Map<String, String> normalField = new LinkedHashMap<String, String>();  /** 文件字段 **/  private Map<String, File> fileField = new LinkedHashMap<String, File>();  public String getAction()  {   return action;  }  public void setAction(String action)  {   this.action = action;  }  public String getMethod()  {   return method;  }  public void setMethod(String method)  {   this.method = method;  }  public Map<String, String> getNormalField()  {   return normalField;  }  public void setNormalField(Map<String, String> normalField)  {   this.normalField = normalField;  }  public Map<String, File> getFileField()  {   return fileField;  }  public void setFileField(Map<String, File> fileField)  {   this.fileField = fileField;  }  public void addFileField(String key, File value)  {   fileField.put(key, value);  }  public void addNormalField(String key, String value)  {   normalField.put(key, value);  } }}

package cn.com.ajava.servlet;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * 文件上传Servlet * @author 曾繁添 */public class ServletUploadFile extends HttpServlet{ private static final long serialVersionUID = 1L; // 限制文件的上传大小 1G private int maxPostSize = 1000 * 1024 * 10; public ServletUploadFile() { super(); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,  IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,  IOException { PrintWriter out = response.getWriter(); String contextPath = request.getSession().getServletContext().getRealPath("/"); String webDir = "uploadfile" + File.separator + "images" + File.separator; String systemPath = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()+ systemPath + "/"; request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); try {  DiskFileItemFactory factory = new DiskFileItemFactory();  factory.setSizeThreshold(1024 * 4); // 设置写入大小  ServletFileUpload upload = new ServletFileUpload(factory);  upload.setSizeMax(maxPostSize); // 设置文件上传最大大小  System.out.println(request.getContentType());  //获取action后面拼接的参数(如：http://www.baidu.com?q=android)  Enumeration enumList = request.getParameterNames();  while(enumList.hasMoreElements()){  String key = (String)enumList.nextElement();  String value = request.getParameter(key);  System.out.println(key+"="+value);  }  //获取提交表单项目  List listItems = upload.parseRequest(request);  Iterator iterator = listItems.iterator();  while (iterator.hasNext())  {  FileItem item = (FileItem) iterator.next();  //非普通表单项目  if (!item.isFormField())  {   //获取扩展名   String ext = item.getName().substring(item.getName().lastIndexOf("."), item.getName().length());   String fileName = System.currentTimeMillis() + ext;   File dirFile = new File(contextPath + webDir + fileName);   if (!dirFile.exists())   {   dirFile.getParentFile().mkdirs();   }   item.write(dirFile);   System.out.println("fileName：" + item.getName() + "=====" + item.getFieldName() + " size： "+ item.getSize());   System.out.println("文件已保存到： " + contextPath + webDir + fileName);   //响应客户端请求   out.print(basePath + webDir.replace("//", "/") + fileName);   out.flush();  }else{   //普通表单项目   System.out.println("表单普通项目："+item.getFieldName()+"=" + item.getString("UTF-8"));// 显示表单内容。item.getString("UTF-8")可以保证中文内容不乱码  }  } } catch (Exception e) {  e.printStackTrace(); } finally {  out.close(); } }}

//创建HttpClientUtil实例HttpClientUtil httpClient = new HttpClientUtil();MultipartForm form = httpClient.new MultipartForm();//设置form属性、参数form.setAction("http://192.168.1.7:8080/UploadFileDemo/cn/com/ajava/servlet/ServletUploadFile");File photoFile = new File(sddCardPath+"//data//me.jpg");form.addFileField("photo", photoFile);form.addNormalField("name", "曾繁添");form.addNormalField("tel", "15122946685");//提交表单HttpClientUtil.submitForm(form);