密码修改
1、编写接口方法和mybatis的SQL映射文件
Mybatis配置多参数SQL语句
当我们的SQL语句中有多个参数的时候，需要设置每个参数名对应的接口参数，不然会报错： Parameter ‘id’ not found. Available parameters are [argl, argg, paraml, param2)
在接口中使用注解
import org.apache.ibatis.annotations.Param;
//...
//修改用户密码
int updatePassword(@Param("password") String password, @Param("id") int id);一定要注意标签的名字！！！修改语句是update 别上来就select
<update id="updatePassword">
update smbms.smbms_user set userPassword = #{password} where id = #{id}
</update>2、UserDao层实现修改方法与数据库交互
在UserDao添加如下方法，这里实现了调用了UserMapper的方法，使得业务代码在这里完成。
注意：mybatis执行增删改这三种语句一定要记得提交事务，否则不生效！！！
//修改当前用户密码
public boolean modifyPassword(int id,String password){
boolean flag = false;
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int res = mapper.updatePassword(password, id);
//修改语句必须提交事务
sqlSession.commit();
if (res > 0){
flag = true;
}
sqlSession.close();
return flag;
}3、编写可复用的Servlet
我们这里要做的修改密码，后期还会有用户的增加删除，显然一个Servlet只实现一个功能太臃肿了。
这里还需要注意，method是我们修改密码是提交的表单form的一个属性，我们获取到method属性后需要先判断是否为空再去判断它的值是修改还是增加或删除。
import com.lyh.dao.UserDao;
import com.lyh.pojo.User;
import com.lyh.utils.Constant;
import com.mysql.cj.util.StringUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class UserServlet extends HttpServlet {
//这个Servlet会处用户的增删改 所以需要在这里定义三个方法
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//实现Servlet复用
String method = req.getParameter("method");
if (method!=null && method.equals("savepwd")){//保证method不为空很重要
this.updatePwd(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
//获取Session
Object user = req.getSession().getAttribute(Constant.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
if (user != null && !StringUtils.isNullOrEmpty(newpassword)){
UserDao dao = new UserDao();
flag = dao.modifyPassword(((User) user).getId(), newpassword);
if (flag){
req.setAttribute("message","修改密码成功,请退出重新登录");
//移除session 重新登录
req.getSession().removeAttribute(Constant.USER_SESSION);
}else {//修改失败
req.setAttribute("message","密码修改失败");
}
}else {
req.setAttribute("message","新密码有问题");
}
try {
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
配置Servlet映射
<servlet>
<servlet-name>UserServlet</servlet-name>
<servlet-class>com.lyh.servlet.user.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserServlet</servlet-name>
<url-pattern>/jsp/user.do</url-pattern>
</servlet-mapping>添加修改界面
将pwdmodify.jsp复制到webapp/jsp/下
用户管理
1、用户数量统计
1、在接口定义三种统计不同身份用户数量的方法：
//根据用户名或者用户角色查询用户总数
int getUserCount();
//根据姓名模糊查询
int getUserCountByName(String name);
//根据身份编号查询用户 1-管理员 2-经理 3-员工
int getUserCountByRole(int role);2、在UserMapper.xml中实现SQL：
<select id="getUserCount" resultType="int">
select count(1) as count from smbms.smbms_user u,smbms.smbms_role r where u.userRole = r.id
</select>
<select id="getUserCountByRole" parameterType="int" resultType="int">
select count(1) as count from smbms.smbms_user u,smbms.smbms_role r where u.userRole = r.id and u.userRole = #{role}
</select>
<select id="getUserCountByName" parameterType="String" resultType="int">
select count(1) as count from smbms.smbms_user u,smbms.smbms_role r where u.userRole = r.id and u.userName like #{name}
</select>3、在UserDao中实现SQL参数传递：
//查询总用户数量
public int getUserCount(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int count = mapper.getUserCount();
sqlSession.close();
return count;
}
//根据用户身份查询数量 1-管理员 2-经理 3-员工
public int getUserCountByRole(int role){
int count = 0;
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
if (role==0){//如果是0就查询全部
count = mapper.getUserCount();
}else {
count = mapper.getUserCountByRole(role);
}
sqlSession.close();
return count;
}
public int getUserCountByName(String name){
name = "%"+name+"%";
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int count = mapper.getUserCountByName(name);
sqlSession.close();
return count;
}2、用户列表
1、在接口定义三种统计不同身份用户列表的方法：
//分页展示所有用户列表
List<User> getUserList(@Param("currentPage") int currentPage,@Param("pageSize") int pageSize);
//根据姓名模糊查询并返回用户列表
List<User> getUserListByName(@Param("name") String name,@Param("currentPage") int currentPage,@Param("pageSize") int pageSize);
//根据身份编号查询用户列表 1-管理员 2-经理 3-员工
List<User> getUserListByRole(@Param("role") int role,@Param("currentPage") int currentPage,@Param("pageSize") int pageSize);
2、在UserMapper.xml中实现SQL：
<select id="getUserList" resultType="User">
select * from smbms_user su join smbms_role sr on su.userRole = sr.id
order by su.id DESC limit #{currentPage},#{pageSize}
</select>
<select id="getUserListByName" resultType="User">
select * from smbms_user su join smbms_role sr on su.userRole = sr.id
and su.userName like #{name}
order by su.id DESC limit #{currentPage},#{pageSize}
</select>
<select id="getUserListByRole" resultType="User">
select * from smbms_user su join smbms_role sr on su.userRole = sr.id
and su.userRole = #{role}
order by su.id DESC limit #{currentPage},#{pageSize}
</select>3、在UserDao中实现SQL参数传递：
public List<User> getUserList(int currentPage,int pageSize){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
currentPage = (currentPage-1)*pageSize;
List<User> userList = mapper.getUserList(0, 5);
return userList;
}
public List<User> getUserListByName(String name,int currentPage,int pageSize){
name = "%"+name+"%";
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.getUserListByName(name, currentPage, pageSize);
sqlSession.close();
return userList;
}
public List<User> getUserListByRole(int role,int currentPage,int pageSize){
List<User> userList = new ArrayList<User>();
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
if (role==0){//如果是0就查询全部
userList = mapper.getUserList(currentPage, pageSize);
}else {
userList = mapper.getUserListByRole(role,currentPage,pageSize);
}
sqlSession.close();
return userList;
}
