Java实现表单提交（支持多文件同时上传）的教程

HttpClientUtil.java

packagecn.com.ajava.util;

importjava.io.File;

importjava.io.Serializable;

importjava.util.Iterator;

importjava.util.LinkedHashMap;

importjava.util.Map;

importjava.util.Map.Entry;

importorg.apache.http.Consts;

importorg.apache.http.HttpEntity;

importorg.apache.http.HttpResponse;

importorg.apache.http.client.HttpClient;

importorg.apache.http.client.methods.HttpPost;

importorg.apache.http.entity.ContentType;

importorg.apache.http.entity.mime.MultipartEntityBuilder;

importorg.apache.http.entity.mime.content.FileBody;

importorg.apache.http.entity.mime.content.StringBody;

importorg.apache.http.impl.client.DefaultHttpClient;

importorg.apache.http.util.EntityUtils;

/**

 * HttpClient工具类

 *

 * @author 曾繁添

 * @version 1.0

 */

publicclassHttpClientUtil

{

 publicfinalstaticString Method_POST ="POST";

 publicfinalstaticString Method_GET ="GET";

 /**

  * multipart/form-data类型的表单提交

  *

  * @param form

  *   表单数据

  */

 publicstaticString submitForm(MultipartForm form)

 {

  // 返回字符串

  String responseStr ="";

  // 创建HttpClient实例

  HttpClient httpClient =newDefaultHttpClient();

  try

  {

   // 实例化提交请求

   HttpPost httpPost =newHttpPost(form.getAction());

   // 创建MultipartEntityBuilder

   MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();

   // 追加普通表单字段

   MapnormalFieldMap = form.getNormalField();

   for(Iterator> iterator = normalFieldMap.entrySet().iterator(); iterator.hasNext();)

   {

    Entryentity = iterator.next();

    entityBuilder.addPart(entity.getKey(),newStringBody(entity.getValue(), ContentType.create("text/plain", Consts.UTF_8)));

   }

   // 追加文件字段

   MapfileFieldMap = form.getFileField();

   for(Iterator> iterator = fileFieldMap.entrySet().iterator(); iterator.hasNext();)

   {

    Entryentity = iterator.next();

    entityBuilder.addPart(entity.getKey(),newFileBody(entity.getValue()));

   }

   // 设置请求实体

   httpPost.setEntity(entityBuilder.build());

   // 发送请求

   HttpResponse response = httpClient.execute(httpPost);

   intstatusCode = 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();

  }

  returnresponseStr;

 }

 /** 表单字段Bean */

 publicclassMultipartFormimplementsSerializable

 {

  /** 序列号 */

  privatestaticfinallongserialVersionUID = -2138044819190537198L;

  /** 提交URL **/

  privateString action ="";

  /** 提交方式：POST/GET **/

  privateString method ="POST";

  /** 普通表单字段 **/

  privateMapnormalField =newLinkedHashMap();

  /** 文件字段 **/

  privateMapfileField =newLinkedHashMap();

  publicString getAction()

  {

   returnaction;

  }

  publicvoidsetAction(String action)

  {

   this.action = action;

  }

  publicString getMethod()

  {

   returnmethod;

  }

  publicvoidsetMethod(String method)

  {

   this.method = method;

  }

  publicMapgetNormalField()

  {

   returnnormalField;

  }

  publicvoidsetNormalField(MapnormalField)

  {

   this.normalField = normalField;

  }

  publicMapgetFileField()

  {

   returnfileField;

  }

  publicvoidsetFileField(MapfileField)

  {

   this.fileField = fileField;

  }

  publicvoidaddFileField(String key, File value)

  {

   fileField.put(key, value);

  }

  publicvoidaddNormalField(String key, String value)

  {

   normalField.put(key, value);

  }

 }

}

ServletUploadFile.java

packagecn.com.ajava.servlet;

importjava.io.File;

importjava.io.IOException;

importjava.io.PrintWriter;

importjava.util.Enumeration;

importjava.util.Iterator;

importjava.util.List;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importorg.apache.commons.fileupload.FileItem;

importorg.apache.commons.fileupload.disk.DiskFileItemFactory;

importorg.apache.commons.fileupload.servlet.ServletFileUpload;

/**

 * 文件上传Servlet

 * @author 曾繁添

 */

publicclassServletUploadFileextendsHttpServlet

{

 privatestaticfinallongserialVersionUID = 1L;

 // 限制文件的上传大小 1G

 privateintmaxPostSize =1000*1024*10;

 publicServletUploadFile()

 {

 super();

 }

 @Override

 protectedvoiddoGet(HttpServletRequest request, HttpServletResponse response)throwsServletException,

  IOException

 {

 doPost(request, response);

 }

 protectedvoiddoPost(HttpServletRequest request, HttpServletResponse response)throwsServletException,

  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 =newDiskFileItemFactory();

  factory.setSizeThreshold(1024*4);// 设置写入大小

  ServletFileUpload upload =newServletFileUpload(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 =newFile(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 =newHttpClientUtil();

MultipartForm form = httpClient.newMultipartForm();

//设置form属性、参数

form.setAction("http://192.168.1.7:8080/UploadFileDemo/cn/com/ajava/servlet/ServletUploadFile");

File photoFile =newFile(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);