Java完成表單提交（支持多文件同時上傳）。本站提示廣大學習愛好者：（Java完成表單提交（支持多文件同時上傳））文章只能為提供參考，不一定能成為您想要的結果。以下是Java完成表單提交（支持多文件同時上傳）正文
在Android外面或許J2EE後台需求趴他人網站數據，模仿表單提交是一件很罕見的事情，但是在Android外面要完成多文件上傳，還要夾著普通表單字段上傳，這下能夠就有點費力了，明天花時間整理了一個工具類，次要是借助於HttpClient，其實也很復雜，看一下代碼就十分清楚了
HttpClient工具類：
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工具類
*
* @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類型的表單提交
*
* @param form
* 表雙數據
*/
public static String submitForm(MultipartForm form)
{
// 前往字符串
String responseStr = "";
// 創立HttpClient實例
HttpClient httpClient = new DefaultHttpClient();
try
{
// 實例化提交懇求
HttpPost httpPost = new HttpPost(form.getAction());
// 創立MultipartEntityBuilder
MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
// 追加普通表單字段
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()));
}
// 設置懇求實體
httpPost.setEntity(entityBuilder.build());
// 發送懇求
HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
// 獲得呼應數據
HttpEntity resEntity = response.getEntity();
if (200 == statusCode)
{
if (resEntity != null)
{
responseStr = EntityUtils.toString(resEntity);
}
}
} catch (Exception e)
{
System.out.println("提交表單失敗，緣由：" + e.getMessage());
} finally
{
httpClient.getConnectionManager().shutdown();
}
return responseStr;
}
/** 表單字段Bean */
public class MultipartForm implements Serializable
{
/** 序列號 */
private static final long serialVersionUID = -2138044819190537198L;
/** 提交URL **/
private String action = "";
/** 提交方式：POST/GET **/
private String method = "POST";
/** 普通表單字段 **/
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);
}
}
}
服務器端完成文件上傳、並且讀取參數辦法：（借助於Apache的fileupload組件完成，完成了獲取表單action前面直接拼接參數、表單普通項目、文件項目三種字段獲取辦法）
後台我就直接寫了一個Servlet，詳細代碼如下：
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;
/**
* 文件上傳Servlet
* @author 曾繁添
*/
public class ServletUploadFile extends HttpServlet
{
private static final long serialVersionUID = 1L;
// 限制文件的上傳大小 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); // 設置寫入大小
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(maxPostSize); // 設置文件上傳最大大小
System.out.println(request.getContentType());
//獲取action前面拼接的參數(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);
}
//獲取提交表單項目
List listItems = upload.parseRequest(request);
Iterator iterator = listItems.iterator();
while (iterator.hasNext())
{
FileItem item = (FileItem) iterator.next();
//非普通表單項目
if (!item.isFormField())
{
//獲取擴展名
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("文件已保管到： " + contextPath + webDir + fileName);
//呼應客戶端懇求
out.print(basePath + webDir.replace("\\", "/") + fileName);
out.flush();
}else{
//普通表單項目
System.out.println("表單普通項目："+item.getFieldName()+"=" + item.getString("UTF-8"));// 顯示表單內容。item.getString("UTF-8")可以保證中文內容不亂碼
}
}
} catch (Exception e)
{
e.printStackTrace();
} finally
{
out.close();
}
}
}
工具類、服務器端代碼下面都貼出來了，詳細怎樣調用應該就不需求說了吧？封裝的曾經夠明晰明了了
調用示例DEMO：
//創立HttpClientUtil實例
HttpClientUtil httpClient = new HttpClientUtil();
MultipartForm form = httpClient.new MultipartForm();
//設置form屬性、參數
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");
//提交表單
HttpClientUtil.submitForm(form);
最後闡明一下jar問題：
要是android外面使用的話，需求留意一下額定引入httpmime-4.3.1.jar（我事先下的這個是最高版本了），至於fileUpload的jar，直接去apache官網下載吧
以上就是本文的全部內容，希望本文的內容對大家的學習或許任務能帶來一定的協助，同時也希望多多支持！
