JavaWeb small project - [source code] use Vue+axios+Servlet+Lombok+JDBC+MySQL technology stack to realize the development of cloud note management system case

lead out

Use Vue+axios+Servlet+Lombok+JDBC+MySQL technology stack to realize the development of cloud note management system case

Small project requirements

(1) Topic requirements
Use Vue+axios+Servlet+Lombok+JDBC+MySQL technology stack to realize the development of a cloud note management system case

(2) Database design (10 points)
Create database woniu_note
(1) User table: t_user, required fields include: username (username), password (passwd)
(2) Folder table: t_folder, required fields include: folder id (id), folder name (folder_name)
(3) Note table: t_note, required fields include: note id (id), note title (title), note content (content), associated folder table id (folder_id)

(3) Project requirements (90 points in total)
(1) Realize user login (10 points)
① After successful login, you can jump to the home page (5 points)
② Require the use of filters to verify the user’s login authority (5 points)
③

(2) Realize the note list query function (20 points)
① Remarks: The folder is obtained by connecting the note table (t_note) to query the folder table (t_folder), otherwise no score (10 points)

(3) Realize the paging display function of the note list (20 points)
① Remarks: The folder is obtained by connecting the note table (t_note) to query the folder table (t_folder), otherwise no points (10 points)

(4) Realize the function of adding notes (10 points)

(5) Realize the function of modifying notes (20 points)
① Require data echo (10 points)
② Successful modification (10 points)

(6) Realize the function of deleting notes (10 points)

fixed things

1. pom.xml file configuration + web.xml file configuration

pom.xml file

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.tianju</groupId>
  <artifactId>javawebTest0612</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>

    <!--    jsp相关-->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!--    数据库相关-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.20</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.16</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.22.RELEASE</version>
    </dependency>

    <!--    其他-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.22</version>
    </dependency>

    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.5</version>
    </dependency>

    <!--    工具包-->
    <dependency>
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
      <version>5.8.11</version>
    </dependency>

    <!--    fastjson包-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.76</version>
    </dependency>

  </dependencies>
</project>

web.xml file

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
</web-app>

2. DBUtils of JDBC in util + string tool StringUtils

DBUtils.java file:

package com.tianju.util;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.jdbc.core.JdbcTemplate;

public class DBUtils {
    
    
    private static DruidDataSource dataSource =null;
    static {
    
    
        String driverClassname = "com.mysql.cj.jdbc.Driver";
        String ip = "127.0.0.1:3306/javaweb";
//        String ip = ConfigMap.getConfig().get("ip");
        // jdbc:mysql://127.0.0.1:3306/javaweb06?useUnicode=true&characterEncoding=UTF-8&userSSL=false&serverTimezone=GMT%2B8
        String url = "jdbc:mysql://"+ip+"?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
//        String url = "jdbc:mysql://"+"127.0.0.1:3306/javaweb"+"?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root";
        String password = "123";
        dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClassname);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
    }

    /**
     *
     * @return 返回一个JdbcTemplate对象
     */
    public static JdbcTemplate getJdbcTemplate(){
    
    
        return new JdbcTemplate(dataSource);
    }
}

StringUtils.java file

package com.tianju.util;

/**
 * 防止前端传过来为null 或者 ""
 */
public class StringUtils {
    
    
    public static Boolean isBlank(String str){
    
    
        if(str==null || str.trim().equals("")){
    
    
            return true;
        }
        return false;
    }
}

3. The PageInfo paging entity class in entity + ResData response standard format

PageInfo.java

package com.tianju.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

/**
 * 和分页相关的实体类
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class PageInfo<T> {
    
    
    private Integer pageNum; // 当前是第几页，如果没有输入，默认是第一页
    private Integer pageSize; // 每页显示的数据条数，百度默认一页10条
    private Integer total; // 总条数；
    private Integer pages; // 总页数；
    private List<T> list; // 传给前端的list
}

ResData.java

package com.tianju.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * 响应的实体类
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class ResData {
    
    
    private Integer code;
    private String msg;
    private Object data;
}

4. The encoding CharacterEncodingFilter and permission LoginAuthorFilter in the filter

CharacterEncodingFilter.java file

package com.tianju.filter;

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

/**
 * 解决编码问题的过滤器
 */
@WebFilter("/*")
public class CharacterEncodingFilter implements Filter {
    
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    
    

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    
    
        // 编码问题
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=utf-8");
        // 一定要记得放行
        chain.doFilter(request, response);

    }

    @Override
    public void destroy() {
    
    

    }
}

LoginAuthorFilter.java file

package com.tianju.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * 控制权限
 */
@WebFilter("/*")
public class LoginAuthorFilter implements Filter {
    
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    
    

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    
    
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        String requestURI = req.getRequestURI();
        // 1.不登录也可以访问的连接，放行
        if (requestURI.contains("/js/")
                || requestURI.contains("/bootstrap/")
                || requestURI.contains("/css/")
                || requestURI.contains("/img/")
                || requestURI.contains("/user/login")
                || requestURI.contains("/user/login.jsp")
        ){
    
    
            chain.doFilter(request, response);
        }else {
    
    
            // 2.其他连接必须登陆后才能访问
            HttpSession session = req.getSession();
            Object user = session.getAttribute("user");
            // 如果没有登陆，就去登陆页面
            if (user==null){
    
    
                resp.sendRedirect(req.getContextPath()+"/user/login.jsp");
            }else {
    
    
                //登陆了,就放行
                chain.doFilter(request, response);
            }
        }
    }

    @Override
    public void destroy() {
    
    

    }
}

5. Front-end fixed js package and bootstrap package

See the code package for this article

Small project source code

See the code package for this article

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Summarize

Use Vue+axios+Servlet+Lombok+JDBC+MySQL technology stack to realize the development of cloud note management system case