java上传类upload

upload.java

@@ -0,0 +1,57 @@
+package upload;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.fileupload.FileItem;
+import org.apache.commons.fileupload.FileUploadException;
+import org.apache.commons.fileupload.disk.DiskFileItemFactory;
+import org.apache.commons.fileupload.servlet.ServletFileUpload;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+/**
+ * @author 徐兴繁
+ * yntravelsky
+ * 2014-11-17
+ * 运行环境windwos
+ *上传
+ */
+public class upload {
+   public String uploadfile(HttpServletRequest request, HttpServletResponse response,String target, String ROOT) throws IOException{
+	   if (!ServletFileUpload.isMultipartContent(request)) {
+           throw new IllegalArgumentException("Request is not multipart, please 'multipart/form-data' enctype for your form.");
+       } 
+       ServletFileUpload uploadHandler = new ServletFileUpload(new DiskFileItemFactory());
+       PrintWriter writer = response.getWriter();
+       response.setContentType("text/html");
+       ArrayList<?> filelist = new ArrayList();
+       try {
+           List<FileItem> items = uploadHandler.parseRequest(request);
+           for (FileItem item : items) {
+               if (!item.isFormField()) {
+                       File file = new File(request.getServletContext().getRealPath("/")+ROOT+target, item.getName());
+                       item.write(file); 
+                       return file.getName();
+               }
+           }
+       } catch (FileUploadException e) {
+               throw new RuntimeException(e);
+       } catch (Exception e) {
+               throw new RuntimeException(e);
+       } finally {
+           ObjectMapper mapper = new ObjectMapper(); 
+			String data=mapper.writeValueAsString(filelist);
+           writer.write(data);
+           writer.close();
+       }
+      return "";
+
+   }
+
+}