Java实现表单提交（支持多文件同时上传）

Java实现表单提交（支持多文件同时上传）

在android里面或者J2EE后台需要趴别人网站数据，模拟表单提交是一件很常见的事情，但是在Android里面要实现多文件上传，还要夹着普通表单字段上传，这下可能就有点费劲了，今天花时间整理了一个工具类，主要是借助于HttpClient，其实也很简单，看一下代码就非常清楚了

HttpClient工具类：

HttpClientUtil.java

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 normalFieldMap = form.getNormalField();

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

{

Entry 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 fileFieldMap = form.getFileField();

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

{

Entry 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

HttpRespoJaMipxOnse 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 normalField = new LinkedHashMap();

/** 文件字段 **/

privathttp://e Map fileField = new LinkedHashMap();

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 getNormalField()

{

return normalField;

}

public void setNormalField(Map normalField)

{

this.normalField = normalField;

}

public Map getFileField()

{

return fileField;

}

public void setFileField(Map 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);

}

}

}

服务器端实现文件上传、并且读取参数方法：（借助于Apache的fileupload组件实现，实现了获取表单action后面直接拼接参数、表单普通项目、文件项目三种字段获取方法）

后台我就直接写了一个Servlet，具体代码如下：

ServletUploadFile.java

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.setConJaMipxOtentType("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://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();

}

}

}

工具类、服务器端代码上面都贴出来了，具体怎么调用应该就不需要说了吧？封装的已经够清晰明了了

调用示例DEMO：

//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);

最后说明一下jar问题：

要是android里面应用的话，需要注意一下额外引入httpmime-4.3.1.jar（我当时下的这个是最高版本了），至于fileUpload的jar，直接去apache官网下载吧

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