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云笔记的项目分析(5):个人中心:修改用户信息

作者:互联网

 <button type="submit" id="btn" class="btn btn-success" >修改</button>

设置按钮的属性为submit,作为表单提交

<form id="myform" class="form-horizontal" method="post" action="user" enctype="multipart/form-data" >
				  <div class="form-group">
				  	<input type="hidden" name="action" value="updateInfo">
				    <label for="nickName" class="col-sm-2 control-label">昵称:</label>
				    <div class="col-sm-3">
				      <input class="form-control" name="nick" id="nickName" placeholder="昵称" value="${user.nick }">
				    </div>
				    <label for="img" class="col-sm-2 control-label">头像:</label>
				    <div class="col-sm-5">
				    	<input type="file" id="img" name="img">
				    </div>
				  </div>
				  <div class="form-group">
				    <label for="mood" class="col-sm-2 control-label">心情:</label>
				    <div class="col-sm-10">
				      <textarea class="form-control" name="mood" id="mood" rows="3">${user.mood }</textarea>
				    </div>
				  </div>			 
				  <div class="form-group">
				    <div class="col-sm-offset-2 col-sm-10">
				      <button type="submit" id="btn" class="btn btn-success" >修改</button>&nbsp;&nbsp;
				      <span style="color:red" id="msg">${resultInfo.msg }</span>
				    </div>
				  </div>
				</form>

表单提交方式:method="post",设置可以文件上传,multipart/form-data  设置了隐藏域 <input type="hidden" name="action" value="updateInfo">

@MultipartConfig

文件上传servlet层必须要设置

Servlet层:

else if ("updateInfo".equals(action)){
			// 修改用户信息
			updateInfo(request, response);
		}
private void updateInfo(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//1.调用service的方法,传request参数,返回resultInfo对象
		ResultInfo<User> resultInfo = userService.updateInfo(request);
		//2.将resultInfo对象存到request作用域中
		request.setAttribute("resultInfo", resultInfo);
		//3.设置动态包含的页面值
		request.setAttribute("changePage", "user/info.jsp");
		//4.请求转发跳转到index.jsp
		request.getRequestDispatcher("index.jsp").forward(request, response);
	}

UserService层:

public ResultInfo<User> updateInfo(HttpServletRequest request) {
		ResultInfo<User> resultInfo = new ResultInfo<>();
		// 1、从session作用域中获取用户对象,得到userId
		User user = (User) request.getSession().getAttribute("user");
		Integer userId = user.getUserId();
		
		// 2、接收参数(昵称、心情)
		String nick = request.getParameter("nick");
		String mood = request.getParameter("mood");
		
		// 3、判断昵称是否为空
		if (StringUtil.isEmpty(nick)) {
			// 为空,code=0,msg=昵称不能为空,返回resultInfo对象
			resultInfo.setCode(0);
			resultInfo.setMsg("用户昵称不能为空!");
			return resultInfo;
		}
		
		// 4、调用Dao层,查询昵称是否被其他用户占用,返回user对象
		User u = userDao.findUserByNick(userId, nick);

因为用户昵称和用户Id是唯一的,修改前先判断昵称是否唯一

// 3、如果user对象存在
		if (u != null) {
			resultInfo.setCode(0);
			resultInfo.setMsg("用户昵称已存在,不可使用!");
			return resultInfo;
		}
		
// 文件上传
		String head = user.getHead();
		
		try {
			// 1、得到part对象 Part part = request.getPart("img"); // getPart(name):前台file表单元素的name属性值
			Part part = request.getPart("img");
			if (part != null) {
				// 2、得到文件存放的路径 path =   request.getServletContext().getRealPath("/WEB-INF/upload/");
				String path = request.getServletContext().getRealPath("/WEB-INF/upload/");
				// 3、得到上传文件的名称 fileName =  part.getSubmitedFiledName()
				String fileName = part.getSubmittedFileName();
				// 4、上传文件到指定路径  part.write(path + fileName);
				part.write(path + fileName);
				head = fileName;
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		// 调用Dao层,返回code 
		int code = userDao.updateInfo(userId, nick, mood, head);
		
		if (code == 1) { // 成功
			resultInfo.setCode(1);
			resultInfo.setMsg("修改成功!");
			// 更新session作用域中的user对象
			user.setNick(nick);
			user.setMood(mood);
			user.setHead(head);
			request.getSession().setAttribute("user", user);
		} else {
			resultInfo.setCode(0);
			resultInfo.setMsg("修改失败!");
		}
		return resultInfo;
	}

Dao层

1.查找用户信息

public User findUserByNick(Integer userId,String nickName){
			User user = null;
			Connection connection = null;
			PreparedStatement preparedStatement = null;
			ResultSet resultSet = null;
					try {
						//1.得到数据库连接
						connection = DBUtil.getConnection();
						//2.写sql语句
						String sql = "select * from tb_user where nick = ? and userId != ?";
						//3.预编译
						preparedStatement = connection.prepareStatement(sql);
						//4.设置参数,下标从1开始
						preparedStatement.setString(1, nickName);
						preparedStatement.setInt(2, userId);
						//5.执行查询,返回结果集
						resultSet = preparedStatement.executeQuery();
						//6.分析结果集,得到user对象
						if (resultSet.next()) {
							user = new User();
							user.setHead(resultSet.getString("head"));
							user.setMood(resultSet.getString("mood"));
							user.setNick(resultSet.getString("nick"));
							user.setUname(resultSet.getString("uname"));
							user.setUpwd(resultSet.getString("upwd"));
							user.setUserId(resultSet.getInt("userId"));	
						}
					} catch (Exception e) {
						e.printStackTrace();
					}finally{
						//关闭
						DBUtil.close(resultSet, preparedStatement, connection);
					}
			return user;
		}

2.修改用户信息

public int updateInfo(Integer userId, String nick, String mood,
				String head) {
			// 1.定义sql语句
			String sql = "update tb_user set nick = ?, mood = ?, head = ? where userId = ?";
			//2.定义参数集合
			List<Object>  params = new ArrayList<Object>();
			params.add(nick);
			params.add(mood);
			params.add(head);
			params.add(userId);
			// 3.调用BaseDao,返回受影响的行数
			int rwo = new BaseDao().executeUpdate(sql,params);
			return rwo;
		}

userdao里调用了BaseDao里的方法

	public int executeUpdate(String sql,List<Object> params) {
		int row = 0;		//受影响的行数
		Connection connection = null;
		PreparedStatement preparedStatement = null;
		try {
			//得到数据库连接
			connection = DBUtil.getConnection();
			//预编译
			preparedStatement = connection.prepareStatement(sql);
			//设置参数
			//判断参数集合是否为空
			if (params !=null && params.size()>0) {
				//循环设置参数,下标从1开始
				for (int i = 0; i < params.size(); i++) {
					preparedStatement.setObject(i+1, params.get(i));
				}
			}
			//执行更新,返回受影响的行数
			row = preparedStatement.executeUpdate();
		} catch (Exception e) {
			e.printStackTrace();
		}
		finally{
			//关闭资源
			DBUtil.close(null, preparedStatement, connection);
			
		}
		return row;
	}

 

标签:String,userId,request,用户,笔记,项目分析,resultInfo,params,user
来源: https://blog.51cto.com/u_13985831/2836988