servlet完成form格式下的文件 文本信息上传（基于MultipartHttpServletRequest实现文件上传）

下载==MultipartHttpServletRequest==jar包

 <dependency>
     <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
       <version>1.3</version>
 </dependency>

前端代码（伪代码）

function f_savedata_bak(){
    var formData = new FormData($('#fileForm')[0]);
    formData.append('userid','2');
    formData.append('header',["对方账号","交易时间","对方单位","转入金额"]);
    formData.append('tableName','T_CTRI_CW_YHRJZ_TEMP');
    formData.append('tableField',["C_ACCOUNTNO","C_JYSJ","C_KHMC","C_ZRJE"]);
    $.ajax({
        type:'post',
        url:getContextPath() + "/*.IMPXLS",
        data:formData,
        cache:false,
        processData: false,
        contentType: false,
    }).success(function(data){
        top.dhtmlx.alert({
            title:"成功",
            type: "alert",
            ok:   "确　定",
            text: "上传成功！",
            callback: function(){
                $("#btnSave").attr("disabled",false);
                window.returnValue = true;
                windowHandler.btnClose.click();
            }
        });
    }).error(function(){
        top.dhtmlx.alert({
            title: "错误",
            type:  "alert-error",
            ok:    "返　回",
            text:  "上传失败！
"+msg,
            callback: function(){
                $("#btnSave").attr("disabled",false);
            }
        });
    });
 
}

　将form中的数据封装到 formdata对象中

后端读取   formdata中的数据

/**
     * @param request
     * 根据请求解析请求中的参数(文件与非文件)返回Map集合,并将文件上传至服务器
     * @return
     */
    private static Map getFilePath(HttpServletRequest request) {
        String upload_directory = "upload";
        String slash_directory = "/";
 
        // 上传配置
        int memory_threshold   = 1024 * 1024 * 3;  // 3MB
        int max_file_size      = 1024 * 1024 * 40; // 40MB
        int max_request_size   = 1024 * 1024 * 50; // 50MB
 
 
        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(memory_threshold);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
        ServletFileUpload upload = new ServletFileUpload(factory);
        // 设置最大文件上传值
        upload.setFileSizeMax(max_file_size);
 
        // 设置最大请求值 (包含文件和表单数据)
        upload.setSizeMax(max_request_size);
 
        upload.setHeaderEncoding("UTF-8");
 
        String uploadPath =  request.getContextPath()+slash_directory+upload_directory;
        String fileName="";
        String filePath="";
        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdirs();
        }
        Map paramMap = new HashMap();
 
        try {
            // 解析请求的内容提取文件数据
            @SuppressWarnings("unchecked")
            List<FileItem> formItems = upload.parseRequest(request);
 
            if (formItems != null && formItems.size() > 0) {
                // 迭代表单数据
                for (FileItem item : formItems) {
                    // 处理不在表单中的字段  图片
                    if (!item.isFormField()) {
                        fileName = new File(item.getName()).getName();
                        filePath = uploadPath + slash_directory + fileName;
                        File storeFile = new File(filePath);
                        item.write(storeFile);
                        paramMap.put("fileName", fileName);
                        paramMap.put("filePath", filePath);
                    }else {
                        String value = item.getString("utf-8");
                        paramMap.put(item.getFieldName(), value);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
       /*Iterator<Map.Entry> entries = paramMap.entrySet().iterator();
	   while (entries.hasNext()) {
	     Map.Entry<Integer, Integer> entry = entries.next();
	     System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
	   }*/
        return paramMap;
    }

　　接着再调用此方法来获取ajax传入的参数,这里需要注意的是上一步的方法获取到都是字符串形式的参数，因此对于前端传入的数组类型的参数需要再转成数组类型：

Map impfileMap = getFilePath(request);//获取解析后的参数列表
String userid = impfileMap.get("userid").toString();//操作人
String headerStr = impfileMap.get("header").toString();//数组形式，需要转换
String tableName = impfileMap.get("tableName").toString();//表名
String tableFieldStr = impfileMap.get("tableField").toString();//数组形式，需要转换
String[] tHeader = headerStr.split(",");//字符串转为字符串数组
String[] tableField = tableFieldStr.split(",");//字符串转为字符串数组