在Android里面或者J2EE后臺需要趴別人網站數據，模擬表單提交是一件很常見的事情，但是在Android里面要實現多文件上傳，還要夾著普通表單字段上傳，這下可能就有點費勁了，今天花時間整理了一個工具類，主要是借助于HttpClient，其實也很簡單，看一下代碼就非常清楚了
HttpClient工具類：
HttpClientUtil.java
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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 * 表單數據 */ public static String submitForm(MultipartForm form) { // 返回字符串 String responseStr = ""; // 創建HttpClient實例 HttpClient httpClient = new DefaultHttpClient(); try { // 實例化提交請求 HttpPost httpPost = new HttpPost(form.getAction()); // 創建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())); } // 設置請求實體 httpPost.setEntity(entityBuilder.build()); // 發送請求 HttpResponse response = httpClient.execute(httpPost); int statusCode = response.getStatusLine().getStatusCode(); // 取得響應數據 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，原因：" + 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); } }} |
服務器端實現文件上傳、并且讀取參數方法：（借助于Apache的fileupload組件實現，實現了獲取表單action后面直接拼接參數、表單普通項目、文件項目三種字段獲取方法）
后臺我就直接寫了一個Servlet，具體代碼如下：
ServletUploadFile.java
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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后面拼接的參數(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("文件已保存到： " + contextPath + webDir + fileName); //響應客戶端請求 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、服務器端代碼上面都貼出來了，具體怎么調用應該就不需要說了吧？封裝的已經夠清晰明了了
調用示例DEMO：
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//創建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); |
最后說明一下jar問題：
要是android里面應用的話，需要注意一下額外引入httpmime-4.3.1.jar（我當時下的這個是最高版本了），至于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者工作能帶來一定的幫助，同時也希望多多支持服務器之家！
原文鏈接：http://www.cnblogs.com/fly100/articles/3492525.html
