添加功能，删除功能，修改功能

标签：功能删除 void request response 添加 user id User

添加功能

分析：

list.jsp修改一下

add.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!-- HTML5文档-->
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的浏览器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
    width: 默认宽度与设备的宽度相同
    initial-scale: 初始的缩放比，为1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>添加用户</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
    <center><h3>添加联系人页面</h3></center>
    <form action="${pageContext.request.contextPath}/addUserServlet" method="post">
        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
        </div>

        <div class="form-group">
            <label>性别：</label>
            <input type="radio" name="gender" value="男" checked="checked"/>男
            <input type="radio" name="gender" value="女"/>女
        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age" name="age" placeholder="请输入年龄">
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" class="form-control" id="address">
                <option value="峡西">峡西</option>
                <option value="广西">广西</option>
                <option value="湖南">湖南</option>
            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" class="form-control" id="qq" name="qq" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" class="form-control" id="email" name="email" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" style="text-align: center">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <input class="btn btn-default" type="button" value="返回" />
        </div>
    </form>
</div>
</body>
</html>

UserDao：添加一个方法

UserDaoImpl：重写方法

@Override
    public void add(User user) {
        //定义sql
        String sql = "insert into user values(null,?,?,?,?,?,?,null,null)";
        //执行sql
        template.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail());
    }

UserService：

UserServiceImpl：

AddUserServlet

@WebServlet("/addUserServlet")
public class AddUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置编码
        request.setCharacterEncoding("utf-8");
        //获取参数
        Map<String, String[]> map = request.getParameterMap();
        //封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //调用Service保存
        UserServiceImpl service = new UserServiceImpl();
        service.addUser(user);
        //跳转到userListServlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

删除功能

分析：

list.jsp：进行修改

UserDao

void delete(int id);

UserDaoImpl

@Override
    public void delete(int id) {
        //定义sql
        String sql = "delete from user where id = ?";
        //执行sql
        template.update(sql,id);
    }

UserService

 /**
     * 根据id删除user
     * @param id
     */
    void deleteUser(String id);

UserServiceImpl

@Override
    public void deleteUser(String id) {
        dao.delete(Integer.parseInt(id));
    }

delUserServlet实现：

@WebServlet("/delUserServlet")
public class delUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取id
        String id = request.getParameter("id");
        //调用service删除
        UserServiceImpl service = new UserServiceImpl();
        service.deleteUser(id);
        //跳转到查询所有的Servlet
        response.sendRedirect(request.getContextPath()+"/userListServlet");

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

修改功能

分析：

信息的回显功能

list.jsp：进行修改

UserDao

User findById(int parseInt);

UserDaoImpl

  @Override
    public User findById(int id) {
        String sql = "select * from user where id=?";
        return template.queryForObject(sql,new BeanPropertyRowMapper<User>(User.class),id);
    }

UserService

/**
     * 根据id查询
     * @param id
     * @return
     */
    User findUserById(String id);

UserServiceImpl

@Override
    public User findUserById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

update.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>修改用户</title>

    <link href="css/bootstrap.min.css" rel="stylesheet">
    <script src="js/jquery-2.1.0.min.js"></script>
    <script src="js/bootstrap.min.js"></script>

</head>
<body>
<div class="container" style="width: 400px;">
    <h3 style="text-align: center;">修改联系人</h3>
    <form action="${pageContext.request.contextPath}/updateUserServlet" method="post">
        <%--隐藏域 提交id--%>
        <input type="hidden" name="id" value="${user.id}">

        <div class="form-group">
            <label for="name">姓名：</label>
            <input type="text" class="form-control" id="name" name="name" value="${user.name}" readonly="readonly" placeholder="请输入姓名" />
        </div>

        <div class="form-group">
            <label>性别：</label>
            <c:if test="${user.gender=='男'}">
                <input type="radio" name="gender" value="男" checked />男
                <input type="radio" name="gender" value="女"  />女
            </c:if>
            <c:if test="${user.gender=='女'}">
                <input type="radio" name="gender" value="男" />男
                <input type="radio" name="gender" value="女" checked />女
            </c:if>
        </div>

        <div class="form-group">
            <label for="age">年龄：</label>
            <input type="text" class="form-control" id="age" value="${user.age}" name="age" placeholder="请输入年龄" />
        </div>

        <div class="form-group">
            <label for="address">籍贯：</label>
            <select name="address" id="address" class="form-control" >
                <c:if test="${user.address=='北京'}">
                    <option value="北京" selected>北京</option>
                    <option value="河北">河北</option>
                    <option value="山西">山西</option>
                </c:if>
                <c:if test="${user.address=='河北'}">
                    <option value="北京">北京</option>
                    <option value="河北" selected>河北</option>
                    <option value="山西">山西</option>
                </c:if>
                <c:if test="${user.address=='山西'}">
                    <option value="北京">北京</option>
                    <option value="河北">河北</option>
                    <option value="山西" selected>山西</option>
                </c:if>

            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ：</label>
            <input type="text" id="qq" class="form-control" value="${user.qq}" name="qq" placeholder="请输入QQ号码"/>
        </div>

        <div class="form-group">
            <label for="email">Email：</label>
            <input type="text" id="email" class="form-control" value="${user.email}" name="email" placeholder="请输入邮箱地址"/>
        </div>

        <div class="form-group" style="text-align: center">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <input class="btn btn-default" type="button" value="返回"/>
        </div>
    </form>
</div>
</body>
</html>

FindUserServlet

@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取id
        String id = request.getParameter("id");
        //调用Service查询
        UserServiceImpl service = new UserServiceImpl();
        User user = service.findUserById(id);
        //将user存入request
        request.setAttribute("user",user);
        //转发到update.jsp页面
        request.getRequestDispatcher("/update.jsp").forward(request,response);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

用户信息修改功能

UserDao

 void update(User user);

UserDaoImpl

@Override
    public void update(User user) {
        String sql = "update user set name =?,gender=?,age=?,address=?,qq=?,email=? where id=?";
        template.update(sql,user.getName(),user.getGender(),user.getAge(),user.getAddress(),user.getQq(),user.getEmail(),user.getId());
    }

UserService

  /**
     * 修改用户信息
     * @param user
     */
    void updateUser(User user);

UserServiceImpl

@Override
    public void updateUser(User user) {
        dao.update(user);
    }

UpdateUserServlet

@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置编码
        request.setCharacterEncoding("utf-8");
        //获取map
        Map<String, String[]> map = request.getParameterMap();
        //封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //调用Service修改
        UserServiceImpl service = new UserServiceImpl();
        service.updateUser(user);
        //跳转到查询页面
        response.sendRedirect(request.getContextPath()+"/userListServlet");


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

标签：功能,删除,void,request,response,添加,user,id,User
From： https://www.cnblogs.com/wsfj/p/17113754.html

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