java网上论坛代码 javaweb论坛

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mob64ca14010a69 2023-12-21 10:49:49

文章标签 java网上论坛代码 java xml apache maven 文章分类 Java 后端开发

第一次项目

萌新刺客的学习小屋
本文总结：第一次写项目有点混乱因jsp太老采用了springmvc的模式
弊端：在使用Spring MVC 做java Web 项目时，乱码问题时常都会出现，解决方法也不尽相同，有简单也有复杂的；如果加入了Spring框架之后就容易了
刚开始的大杂烩（留给以后自己优化)
学习spring后将会对本项目进行优化

人生指引
虚心求学，共同进步
新人希望大家多多指导关照

文章目录

第一次项目
mybatis框架注意事项
宿舍管理的基本CRUD+用户登录注册(mybatis+servlet+shymeleaf)
项目的流程
xml文件

pom.xml
mybatis-config.xml
DormitoryMapper.xml
mapper

DormitoryMapper
UserMapper

pojo

Dormitory
User

service

UserServiceimpl
DormitoryService
DormitoryServiceImpl

util

SqlSessionFactoryUtils
StringUtil

servlet

ViewBaseServlet
ModelBaseServlet
RegisterServlet
LoginServlet
ListServlet
AddServlet
DeleteServlet
UpdateServlet
EditServlet

mybatis框架注意事项

dao层也叫mapper层，持久层：操作数据库
任务：写接口和配置

service：调用dao层的操作将其写成方法

如果resultmap报错

Result Maps collection does not contain value for

注意：由其他mapper.xml中的resultMap参数导致的错误
(检查其他xml是否有resultmap未定义却被引用)

resultmap
1.id
2.result

<resultMap id="dormitoryResultMap" type="dormitory">
        <result column="student_name" property="studentName" />
        <result column="dormitory_name" property="dormitoryName"/>
    </resultMap>

宿舍管理的基本CRUD+用户登录注册(mybatis+servlet+shymeleaf)

项目的流程

java网上论坛代码 javaweb论坛_java

xml文件

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>brand-case</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>


    <dependencies>
        <!--Servlet-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>


        <!--MyBatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <!--MySQL-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>


        <!--fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.62</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf</artifactId>
            <version>3.0.15.RELEASE</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>

            </plugin>
        </plugins>
    </build>
</project>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--起别名-->
    <typeAliases>
        <package name="com.ym.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///db1?useSSL=false&useServerPrepStmts=true"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--扫描mapper-->
        <package name="com.ym.mapper"/>
    </mappers>
</configuration>

DormitoryMapper.xml

mapper

DormitoryMapper

package com.ym.mapper;

import com.ym.pojo.Dormitory;
import org.apache.ibatis.annotations.Delete;

import org.apache.ibatis.annotations.*;

import java.util.List;

public interface DormitoryMapper {
    /**
     * 查找全部
     * @return
     */
    @Select("select * from tb_dormitory")
    @ResultMap("dormitoryResultMap")
    List<Dormitory> selectAll();

    @Select("select * from tb_dormitory where id = #{id}")
    @ResultMap("dormitoryResultMap")
    Dormitory getDormitoryById(Integer id);

    @Delete("delete from tb_dormitory where id = #{id}")
    @ResultMap("dormitoryResultMap")
    void delete(Integer id);

    @Insert("insert into tb_dormitory(student_name, dormitory_name,status) values (#{studentName},#{dormitoryName},#{status})")
    @ResultMap("dormitoryResultMap")
    void add(Dormitory dormitory);


    @Update("update tb_dormitory set student_name=#{studentName},dormitory_name=#{dormitoryName},status=#{status} where id=#{id}")
    @ResultMap("dormitoryResultMap")
    void update(Dormitory dormitory);
}

UserMapper

package com.ym.mapper;

import com.ym.pojo.Dormitory;
import com.ym.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

public interface UserMapper {

    /**
     * 根据用户名和密码查询
     * @param username
     * @param password
     * @return
     */
    @Select("select * from tb_user where username = #{username} and password = #{password}")
    User select(@Param("username") String username, @Param("password")String password);

    /**
     * 根据用户名查询用户对象---注册
     * @param username
     * @return
     */
    @Select("select * from tb_user where username = #{username}")
    User selectByUsername(String username);

    /**
     * 添加用户
     * @param user
     */
    @Insert("insert into tb_user values(null,#{username},#{password})")
    void add(User user);



}

pojo

Dormitory

package com.ym.pojo;

/**
 * 宿舍实体类
 */

public class Dormitory {
    // id 主键
    private Integer id;
    // 学生姓名
    private String studentName;
    // 宿舍名称
    private String dormitoryName;
    // 状态：0：未到校  1：到校
    private Integer status;

    public Dormitory() {
    }


    public Dormitory(Integer id, String studentName, String dormitoryName, Integer status) {
        this.id = id;
        this.studentName = studentName;
        this.dormitoryName = dormitoryName;
        this.status = status;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public String getDormitoryName() {
        return dormitoryName;
    }

    public void setDormitoryName(String dormitoryName) {
        this.dormitoryName = dormitoryName;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", studentName='" + studentName + '\'' +
                ", dormitoryName='" + dormitoryName + '\'' +
                ", status=" + status +
                '}';
    }
}

User

package com.ym.pojo;

public class User {

    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

service

UserServiceimpl

package com.ym.service;

import com.ym.mapper.UserMapper;
import com.ym.pojo.User;
import com.ym.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;


public class UserService {
    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();

    /**
     * 登录方法
     * @param username
     * @param password
     * @return
     */

    public User selectUser(String username, String password){
        //2. 获取SqlSession
        SqlSession sqlSession = factory.openSession();
        //3. 获取UserMapper
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        //4. 调用方法
        User user = mapper.select(username, password);

        //释放资源
        sqlSession.close();

        return  user;
    }



    /**
     * 注册方法
     * @return
     */

    public boolean register(User user){
        //2. 获取SqlSession
        SqlSession sqlSession = factory.openSession();
        //3. 获取UserMapper
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        //4. 判断用户名是否存在
        User u = mapper.selectByUsername(user.getUsername());

        if(u == null){
            // 用户名不存在，注册
            mapper.add(user);
            sqlSession.commit();
            sqlSession.close();
            return true;
        }
        else {
            sqlSession.close();

            return false;
        }

    }
}

DormitoryService

package com.ym.service;

import com.ym.pojo.Dormitory;
import com.ym.pojo.Page;

import java.util.List;

public interface DormitoryService {

    /**
     * 查询所有
     * @return
     */
    List<Dormitory> selectAll();

    /**
     * 添加数据
     * @param dormitory
     */
    void add(Dormitory dormitory);

    /**
     * 批量删除
     * @param id
     */
    void delete(Integer id);

    /**
     * 编辑学生个人信息：将来可以分不同权限限制操作
     * @param id
     * @return
     */
    Dormitory getDormitoryById(Integer id);


    Dormitory update(Dormitory dormitory);
}

DormitoryServiceImpl

package com.ym.service.impl;

import com.ym.mapper.DormitoryMapper;
import com.ym.pojo.Dormitory;
import com.ym.pojo.Page;
import com.ym.service.DormitoryService;
import com.ym.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class DormitoryServiceImpl implements DormitoryService {
    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();

    @Override
    public List<Dormitory> selectAll() {
        SqlSession sqlSession = factory.openSession();
        DormitoryMapper mapper = sqlSession.getMapper(DormitoryMapper.class);
        List<Dormitory> dormitories = mapper.selectAll();
        sqlSession.close();
        return dormitories;
    }

    @Override
    public void add(Dormitory dormitory) {
        SqlSession sqlSession = factory.openSession(true);
        DormitoryMapper mapper = sqlSession.getMapper(DormitoryMapper.class);
        mapper.add(dormitory);
        sqlSession.close();
    }

    @Override
    public void delete(Integer id) {
        SqlSession sqlSession = factory.openSession(true);
        DormitoryMapper mapper = sqlSession.getMapper(DormitoryMapper.class);
        mapper.delete(id);
        sqlSession.close();
    }


    @Override
    public Dormitory getDormitoryById(Integer id) {
        SqlSession sqlSession = factory.openSession(true);
        DormitoryMapper mapper = sqlSession.getMapper(DormitoryMapper.class);
        Dormitory dormitory = mapper.getDormitoryById(id);
        sqlSession.close();
        return dormitory;
    }

    @Override
    public Dormitory update(Dormitory dormitory) {
        SqlSession sqlSession = factory.openSession(true);
        DormitoryMapper mapper = sqlSession.getMapper(DormitoryMapper.class);
        mapper.update(dormitory);
        sqlSession.close();
        return dormitory;
    }

}

util

SqlSessionFactoryUtils

package com.ym.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class SqlSessionFactoryUtils {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        //静态代码块会随着类的加载而自动执行，且只执行一次
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }
}

StringUtil

package com.ym.util;

public class StringUtil {
    public static boolean isEmpty(String str){
        return str==null || "".equals(str);
    }
    public static boolean isNotEmpty(String str){
        return !isEmpty(str);
    }
}

servlet

ViewBaseServlet

package com.ym.web.servlet;

import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

import javax.servlet.ServletContext;
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 ViewBaseServlet extends HttpServlet {

    private TemplateEngine templateEngine;

    @Override
    public void init() throws ServletException {

        // 1.获取ServletContext对象
        ServletContext servletContext = this.getServletContext();

        // 2.创建Thymeleaf解析器对象
        ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(servletContext);

        // 3.给解析器对象设置参数
        // ①HTML是默认模式，明确设置是为了代码更容易理解
        templateResolver.setTemplateMode(TemplateMode.HTML);

        // ②设置前缀
        String viewPrefix = servletContext.getInitParameter("view-prefix");

        templateResolver.setPrefix(viewPrefix);

        // ③设置后缀
        String viewSuffix = servletContext.getInitParameter("view-suffix");

        templateResolver.setSuffix(viewSuffix);

        // ④设置缓存过期时间（毫秒）
        templateResolver.setCacheTTLMs(60000L);

        // ⑤设置是否缓存
        templateResolver.setCacheable(true);

        // ⑥设置服务器端编码方式
        templateResolver.setCharacterEncoding("utf-8");

        // 4.创建模板引擎对象
        templateEngine = new TemplateEngine();

        // 5.给模板引擎对象设置模板解析器
        templateEngine.setTemplateResolver(templateResolver);

    }

    protected void processTemplate(String templateName, HttpServletRequest req, HttpServletResponse resp) throws IOException {
        // 1.设置响应体内容类型和字符集
        resp.setContentType("text/html;charset=UTF-8");

        // 2.创建WebContext对象
        WebContext webContext = new WebContext(req, resp, getServletContext());

        // 3.处理模板数据
        templateEngine.process(templateName, webContext, resp.getWriter());
    }
}

ModelBaseServlet

package com.ym.web.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.lang.reflect.Method;

@WebServlet("/ModelBaseServlet")
public class ModelBaseServlet extends ViewBaseServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // 在doGet()方法中调用doPost()方法，这样就可以在doPost()方法中集中处理所有请求
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // 0.在所有request.getParameter()前面设置解析请求体的字符集
        request.setCharacterEncoding("UTF-8");

        // 1.从请求参数中获取method对应的数据
        String method = request.getParameter("method");

        // 2.通过反射调用method对应的方法
        // ①获取Class对象
        Class<? extends ModelBaseServlet> clazz = this.getClass();

        try {
            // ②获取method对应的Method对象
            Method methodObject = clazz.getDeclaredMethod(method, HttpServletRequest.class, HttpServletResponse.class);

            // ③打开访问权限
            methodObject.setAccessible(true);

            // ④通过Method对象调用目标方法
            methodObject.invoke(this, request, response);
        } catch (Exception e) {
            e.printStackTrace();

            throw new RuntimeException(e);
        }
    }

}

RegisterServlet

package com.ym.web.servlet.no;

import com.ym.pojo.User;
import com.ym.service.UserService;
import com.ym.web.servlet.ViewBaseServlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/registerServlet")
public class RegisterServlet extends ViewBaseServlet {
    private UserService service = new UserService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       //1. 获取用户名和密码数据

        request.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        boolean flag = service.register(user);
        //3. 判断注册成功与否
        if(flag){
            super.processTemplate("login",request,response);
        }
        else {

            super.processTemplate("register",request,response);
        }


    }

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

LoginServlet

package com.ym.web.servlet.no;

import com.ym.pojo.User;
import com.ym.service.UserService;
import com.ym.pojo.User;
import com.ym.service.UserService;
import com.ym.web.servlet.ViewBaseServlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/loginServlet")
public class LoginServlet extends ViewBaseServlet {
    private UserService service = new UserService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取用户名和密码
        request.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        //获取复选框数据
//        String remember = request.getParameter("remember");

        //2. 调用service查询
        User user = service.selectUser(username, password);

        //3. 判断
        //获取字符输出流，并设置content type

        //3. 判断user释放为null
        if(user != null){
            // 登陆成功
            response.sendRedirect("listServlet");

        }else {
            // 登陆失败
            super.processTemplate("login",request,response);
        }
    }

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

ListServlet

package com.ym.web.servlet.no;

import com.ym.pojo.Dormitory;
import com.ym.service.DormitoryService;
import com.ym.service.impl.DormitoryServiceImpl;
import com.ym.web.servlet.ViewBaseServlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.List;

@WebServlet("/listServlet")
public class ListServlet extends ViewBaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        DormitoryService dormitoryService = new DormitoryServiceImpl();
        //调用service查询
        List<Dormitory> dormitories = dormitoryService.selectAll();

        HttpSession session = request.getSession();
        session.setAttribute("dormitories",dormitories);

        super.processTemplate("list",request,response);
    }

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

AddServlet

package com.ym.web.servlet.no;

import com.ym.pojo.Dormitory;
import com.ym.service.DormitoryService;
import com.ym.service.impl.DormitoryServiceImpl;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
     private DormitoryService dormitoryService = new DormitoryServiceImpl();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String studentName = request.getParameter("studentName");
        String dormitoryName = request.getParameter("dormitoryName");
        int status = Integer.parseInt(request.getParameter("status"));
        Dormitory dormitory = new Dormitory(null,studentName,dormitoryName,status);
        dormitoryService.add(dormitory);
        response.sendRedirect("listServlet");
        }

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

DeleteServlet

package com.ym.web.servlet.no;

import com.ym.service.DormitoryService;
import com.ym.service.impl.DormitoryServiceImpl;
import com.ym.util.StringUtil;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/deleteServlet")
public class DeleteServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        DormitoryService dormitoryService = new DormitoryServiceImpl();
        String Instr = request.getParameter("id");
        if(StringUtil.isNotEmpty(Instr)){
            int id = Integer.parseInt(Instr);
            dormitoryService.delete(id);
            response.sendRedirect("listServlet");
        }
    }

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

UpdateServlet

package com.ym.web.servlet.no;

import com.ym.pojo.Dormitory;
import com.ym.service.impl.DormitoryServiceImpl;
import com.ym.web.servlet.ViewBaseServlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/updateServlet")
public class UpdateServlet extends ViewBaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");


        DormitoryServiceImpl dormitoryService = new DormitoryServiceImpl();


        String idStr = request.getParameter("id");
        String studentName = request.getParameter("studentName");
        String dormitoryName = request.getParameter("dormitoryName");
        String statusStr = request.getParameter("status");
        int id = Integer.parseInt(idStr);
        int status = Integer.parseInt(statusStr);
        Dormitory dormitory = new Dormitory(id, studentName, dormitoryName, status);

        dormitoryService.update(dormitory);


//        super.processTemplate("list",request,response);
        //相当于list.html

        //修改后需要重定向
        response.sendRedirect("listServlet");
    }

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

EditServlet

package com.ym.web.servlet.no;

import com.ym.pojo.Dormitory;
import com.ym.pojo.Page;
import com.ym.service.DormitoryService;
import com.ym.service.impl.DormitoryServiceImpl;
import com.ym.util.StringUtil;
import com.ym.web.servlet.ViewBaseServlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.List;

@WebServlet("/editServlet")
public class EditServlet extends ViewBaseServlet {
    private DormitoryService dormitoryService=new DormitoryServiceImpl();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idStr = request.getParameter("id");
        if (StringUtil.isNotEmpty(idStr)){
            int id = Integer.parseInt(idStr);
            Dormitory dormitory = dormitoryService.getDormitoryById(id);
            request.setAttribute("dormitory",dormitory);
            super.processTemplate("edit",request,response);
        }
    }

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

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第一次项目

文章目录

宿舍管理的基本CRUD+用户登录注册(mybatis+servlet+shymeleaf)

项目的流程

xml文件

pom.xml

mybatis-config.xml

DormitoryMapper.xml

mapper

DormitoryMapper

UserMapper

pojo

Dormitory

User

service

UserServiceimpl

DormitoryService

DormitoryServiceImpl

util

SqlSessionFactoryUtils

StringUtil

servlet

ViewBaseServlet

ModelBaseServlet

RegisterServlet

LoginServlet

ListServlet

AddServlet

DeleteServlet

UpdateServlet

EditServlet

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