Java实现表单提交支持多文件同时上传

本文介绍了Java、Android实现表单提交（支持多文件同时上传）的方法，具有一定的参考价值，下面跟着小编一起来看下吧

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 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 normalField = new LinkedHashMap(); /** 文件字段 **/ private 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.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(); } } }

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

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持编程之家！