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小程序前端代码：

这里上传一张图片和两个数据

wx.uploadFile({      url: "http://localhost:8080/wechat/wechat",     filePath: "http://tmp/wxef9d9fa6091dbd8c.o6zAJsx_1Ky50578NSeL3g9RcnG4.bc1bdc4f54e601a1432762527e266d61.png",//图片路径，如tempFilePaths[0]     header: { "Content-Type": "multipart/form-data" },     name: 'image',     formData:{       a: encodeURI("123fdsfdsa12"),       b: encodeURI("12312"),     }   })

这两个jar包是在一起使用的，我在建工程文件的时候因为版本的问题就出现了很多问题。

package wechat;import java.io.File;import java.io.IOException;import java.io.PrintStream;import java.net.URLDecoder;import java.util.HashMap;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.FileItemFactory;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import net.sf.json.JSONObject;import org.apache.commons.*;/** * Servlet implementation class wechat */public class wechat extends HttpServlet {	private static final long serialVersionUID = 1L;	private String uploadFilePath = "D:\\upload";	File tempFile;	           /**     * @see HttpServlet#HttpServlet()     */    public wechat() {        super();        // TODO Auto-generated constructor stub    }	/**	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)	 */	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		System.out.println("图片存放");	    request.setCharacterEncoding("UTF-8");	    	    boolean isMultipart = ServletFileUpload.isMultipartContent(request);	    if (isMultipart)	    {	      String dir = "D:\\upload";	      	      File dirFile = new File(dir);	      if (!dirFile.exists()) {	        dirFile.mkdirs();	      }	      try	      {	        FileItemFactory factory = new DiskFileItemFactory();	        ServletFileUpload fileUpload = new ServletFileUpload(factory);	        	        List
   
     items = fileUpload.parseRequest(request);	        for (FileItem item : items) {	          if (item.isFormField())	          {	        	  	            String name = item.getFieldName();	            System.out.println(name+" "+URLDecoder.decode(item.getString(), "utf-8"));	           	          }	          else	          {			              System.out.println(dir);	              System.out.println("item.getName=" + item.getName());	              String longFileName = item.getName();	              System.out.println("longFileName:" + longFileName);	              char indexChar = '\\';	              String fileName = item.getName().substring(longFileName.lastIndexOf(indexChar) + 1, longFileName.length());	              System.out.println("filePath=" + dir + "\\" + fileName);	              File saveFile = new File(dirFile, fileName);	              item.write(saveFile);	            	          }	        }	        	      }	      catch (Exception e)	      {	        e.printStackTrace();	      }	    }	}	/**	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)	 */	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		// TODO Auto-generated method stub		doGet(request, response);	}}
   

因为很久以前写的了，所以把所有的都打包上传了，有需要的可以看一看：