JAVAEE new customers, data dictionary, file upload and modify customer explanation

Author: kentpeng

Please indicate the source for reprinting:

1. New customers

　1. Data dictionary

Used for enumeration A limited number of dictionary items in the project

　 (1) The relationship between the data dictionary in the table and other tables:

　

　

Table creation statement:

CREATE TABLE `base_dict` (
  `dict_id` varchar(32) NOT NULL COMMENT '数据字典id(主键)',
  `dict_type_code` varchar(10) NOT NULL COMMENT '数据字典类别代码',
  `dict_type_name` varchar(64) NOT NULL COMMENT '数据字典类别名称',
  `dict_item_name` varchar(64) NOT NULL COMMENT '数据字典项目名称',
  `dict_item_code` varchar(10) DEFAULT NULL COMMENT '数据字典项目(可为空)',
  `dict_sort` int(10) DEFAULT NULL COMMENT '排序字段',
  `dict_enable` char(1) NOT NULL COMMENT '1:使用 0:停用',
  `dict_memo` varchar(64) DEFAULT NULL COMMENT '备注',  PRIMARY KEY (`dict_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

(2) Mapping file configuration

Reference data dictionary object in customer entity:

    //引用关联的数据字典对象private BaseDict cust_source; //客户来源 cust_source.dict_idprivate BaseDict cust_industry; //客户行业private BaseDict cust_level; //客户级别

Configure the data dictionary object in the mapping file:

        <!-- 多对一 --><many-to-one></many-to-one><many-to-one></many-to-one><many-to-one></many-to-one>

2. Use ajax technology to load the dictionary drop-down selection on the page

//使用ajax加载数据字典,生成select//参数1: 数据字典类型 (dict_type_code)//参数2: 将下拉选放入的标签id//参数3: 生成下拉选时,select标签的name属性值//参数4: 需要回显时,选中哪个optionfunction loadSelect(typecode,positionId,selectname,selectedId){//1 创建select对象,将name属性指定var $select =  $("<select></select>");//2 添加提示选项$select.append($("<option>---请选择---</option>"));//3 使用jquery 的ajax 方法,访问后台Action$.post("${pageContext.request.contextPath}/BaseDictAction", { dict_type_code:typecode},      function(data){               //遍历//4 返回json数组对象,对其遍历   $.each( data, function(i, json){// 每次遍历创建一个option对象   var $option = $("<option>"+json["dict_item_name"]+"</option>"); 
                   if(json['dict_id'] == selectedId){//判断是否需要回显 ,如果需要使其被选中$option.attr("selected","selected");
            }//并添加到select对象                $select.append($option);
               });
      },"json");        //5 将组装好的select对象放入页面指定位置$("#"+positionId).append($select);
}

Add.jsp

$(document).ready(function(){
    loadSelect("006","level","cust_level.dict_id");
    loadSelect("001","industry","cust_industry.dict_id");
    loadSelect("009","source","cust_source.dict_id");
    });

BaseDictAction：

public class BaseDictAction extends ActionSupport {private String dict_type_code;    private BaseDictService baseDictService;
    @Overridepublic String execute() throws Exception {//1 调用Service根据typecode获得数据字典对象listList<basedict> list = baseDictService.getListByTypeCode(dict_type_code);//2 将list转换为 json格式String json = JSONArray.fromObject(list).toString();//3 将json发送给浏览器ServletActionContext.getResponse().setContentType("application/json;charset=utf-8");
        ServletActionContext.getResponse().getWriter().write(json);return null;//告诉struts2不需要进行结果处理    }    public String getDict_type_code() {return dict_type_code;
    }public void setDict_type_code(String dict_type_code) {this.dict_type_code = dict_type_code;
    }public void setBaseDictService(BaseDictService baseDictService) {this.baseDictService = baseDictService;
    }
}</basedict>

BaseDictServiceImpl：

public class BaseDictServiceImpl implements BaseDictService {    private BaseDictDao bdd;
    
    @Overridepublic List<basedict> getListByTypeCode(String dict_type_code) {return bdd.getListByTypeCode(dict_type_code);
    }public void setBdd(BaseDictDao bdd) {this.bdd = bdd;
    }
}</basedict>

BaseDictDaoImpl:

public class BaseDictDaoImpl extends BaseDaoImpl<basedict> implements BaseDictDao {

    @Overridepublic List<basedict> getListByTypeCode(String dict_type_code) {//Criteria        //创建离线查询对象DetachedCriteria dc = DetachedCriteria.forClass(BaseDict.class);//封装条件dc.add(Restrictions.eq("dict_type_code", dict_type_code));//执行查询List<basedict> list = (List<basedict>) getHibernateTemplate().findByCriteria(dc);        return list;
    }
}</basedict></basedict></basedict></basedict>

struts.xml

        <!-- 数据字典Action --><action></action>

applicationContext.xml

    <bean><property></property></bean><bean><property></property></bean><bean><!-- 注入sessionFactory --><property></property></bean>

3. Analysis Achieve new customers

　

2. Add file upload to new customers

　1. Three requirements for the file upload page

    <!-- 文件上传页面3个要求:1.表单必须post提交2.表单提交类型enctype.必须多段式.3.文件上传使用<input type="file" /> 组件
     -->
    

2. Background reception (remember to generate the getset method)

    //上传的文件会自动封装到File对象//在后台提供一个与前台input type=file组件 name相同的属性private File photo;//在提交键名后加上固定后缀FileName,文件名称会自动封装到属性中private String photoFileName;//在提交键名后加上固定后缀ContentType,文件MIME类型会自动封装到属性中 private String photoContentType;

Use:

    public String add() throws Exception {if(photo!=null){
        System.out.println("文件名称:"+photoFileName);
        System.out.println("文件类型:"+photoContentType);//将上传文件保存到指定位置photo.renameTo(new File("E:/upload/haha.jpg"));
        }

3. Customer modification

　

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