SpringMVC之CRUD(增删改查)

• SpringMVC之CRUD(增删改查)

数据库

# 创建表

CREATE TABLE Student (
    sid INT PRIMARY KEY,
    sname VARCHAR(50),
    sage INT,
    spic VARCHAR(255));

给student表插入数据
INSERT INTO Student (sid, sname, sage, spic)
VALUES 
(1, 'John Do', 25, 'path/to/image1.jpg'),
(2, 'Jane Smith', 30, 'path/to/image2.jpg'),
(3, 'Alex Johnson', 35, 'path/to/image3.jpg'),
(4, 'Emily Davis', 28, 'path/to/image4.jpg'),
(5, 'Michael Wilson', 40, 'path/to/image5.jpg'),
(6, 'Sarah Brown', 37, 'path/to/image6.jpg'),
(7, 'David Lee', 45, 'path/to/image7.jpg'),
(8, 'Carolyn Taylor', 22, 'path/to/image8.jpg');

公共页面跳转,配置。。。

package com.zlj.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author zlj
 * @create 2023-09-07 14:50
 * 处理页面跳转
 * 以往
 *新增
 *新增
 *新增
 * 现在
 *新增
 *新增
 *新增
 */
@Controller
public class pageController {
@RequestMapping("/page/{page}")
    public String toPage(@PathVariable("page") String page){
    return page;
}
@RequestMapping("/page/{dir}{page}")
    public String toDirPage(
            @PathVariable("dir") String dir,
            @PathVariable("page") String page){
    return dir + "/" + page;
    }
//    @RequestMapping("/order/presave")
//    public String orderpre(){
//        return "/order/presave";
//    }
//    @RequestMapping("/clz/presave")
//    public String clzpre(){
//        return "/clz/presave";
//    }

}

package com.zlj.util;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

public class PageBean implements Serializable {

	private static final long serialVersionUID = 2422581023658455731L;

	//页码
	private int page=1;
	//每页显示记录数
	private int rows=10;
	//总记录数
	private int total=0;
	//是否分页
	private boolean isPagination=true;
	//上一次的请求路径
	private String url;
	//获取所有的请求参数
	private Map map;
	
	public PageBean() {
		super();
	}
	
	//设置请求参数
	public void setRequest(HttpServletRequest req) {
		String page=req.getParameter("page");
		String rows=req.getParameter("rows");
		String pagination=req.getParameter("pagination");
		this.setPage(page);
		this.setRows(rows);
		this.setPagination(pagination);
		this.url=req.getContextPath()+req.getServletPath();
		this.map=req.getParameterMap();
	}
	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public Map getMap() {
		return map;
	}

	public void setMap(Map map) {
		this.map = map;
	}

	public int getPage() {
		return page;
	}

	public void setPage(int page) {
		this.page = page;
	}
	
	public void setPage(String page) {
		if(null!=page&&!"".equals(page.trim()))
			this.page = Integer.parseInt(page);
	}

	public int getRows() {
		return rows;
	}

	public void setRows(int rows) {
		this.rows = rows;
	}
	
	public void setRows(String rows) {
		if(null!=rows&&!"".equals(rows.trim()))
			this.rows = Integer.parseInt(rows);
	}

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}
	
	public void setTotal(String total) {
		this.total = Integer.parseInt(total);
	}

	public boolean isPagination() {
		return isPagination;
	}
	
	public void setPagination(boolean isPagination) {
		this.isPagination = isPagination;
	}
	
	public void setPagination(String isPagination) {
		if(null!=isPagination&&!"".equals(isPagination.trim()))
			this.isPagination = Boolean.parseBoolean(isPagination);
	}
	
	/**
	 * 获取分页起始标记位置
	 * @return
	 */
	public int getStartIndex() {
		//(当前页码-1)*显示记录数
		return (this.getPage()-1)*this.rows;
	}
	
	/**
	 * 末页
	 * @return
	 */
	public int getMaxPage() {
		int totalpage=this.total/this.rows;
		if(this.total%this.rows!=0)
			totalpage++;
		return totalpage;
	}
	
	/**
	 * 下一页
	 * @return
	 */
	public int getNextPage() {
		int nextPage=this.page+1;
		if(this.page>=this.getMaxPage())
			nextPage=this.getMaxPage();
		return nextPage;
	}
	
	/**
	 * 上一页
	 * @return
	 */
	public int getPreivousPage() {
		int previousPage=this.page-1;
		if(previousPage<1)
			previousPage=1;
		return previousPage;
	}

	@Override
	public String toString() {
		return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
				+ "]";
	}
}

package com.zlj.util;

import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

public class ResponseUtil {

	public static void write(HttpServletResponse response,Object o)throws Exception{
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.println(o.toString());
		out.flush();
		out.close();
	}
	
	public static void writeJson(HttpServletResponse response,Object o)throws Exception{
		ObjectMapper om = new ObjectMapper();
//		om.writeValueAsString(o)代表了json串
		write(response, om.writeValueAsString(o));
	}
}

//generatorConfig.xml



    
    

    
    

    
    
        
        
            
             
        

        
        

        
        
            
            
        

        
        
        
        
            
            
            
            
            
            
            
            
        

        
        
            
            
        

        
        
        
        
        
            
            
        

        
        
        
        
        
        
        
        
        
        
        
        
        

        

    

//jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://47.100.191.44:3308/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=test01
jdbc.password=test01

//log4j2.xml




    
        
        /root/workspace/lucenedemo/logs
        /root/workspace/lucenedemo/logs/error
        /root/workspace/lucenedemo/logs/warn
        %d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n
    

    
        
        
            
            
            
            
            
        

        
        
        
            
        
        
        
            
            
            
            
                
                
                
                
                
                
            
        

        
            
            
            
                
                
            
            
            
        

        
            
            
            
                
                
                
            
        

    

    
    
        
        
        

        
        
        
        
        
        


        
        
            
            
            
            
        

    

//spring-content.xml




    

//spring-mvc.xml


   
    

    
    

    
    
        
        
        
        
    

    



    

    

//spring-mybatis.xml


    
    
    
    
    

    

    
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
    

    
    
    
        
        
        
        
        
        
        
        
            
                
                    
                        
                            helperDialect=mysql
                        
                    
                
            
        
    

    
    
    
        
        
        
        
    

    
        
    
    
    

//header.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>



    
    
    
    
    
    


<%
    request.setAttribute("ctx",request.getContextPath());
%>

//web.xml


  Archetype Created Web Application
  
  
  
    contextConfigLocation
    classpath:spring-content.xml
  
  
  
    org.springframework.web.context.ContextLoaderListener
  
  

  
  
    encodingFilter
    org.springframework.web.filter.CharacterEncodingFilter
    true
    
      encoding
      UTF-8
    
  
  
    encodingFilter
    /*
  

  
  
    SpringMVC
    org.springframework.web.servlet.DispatcherServlet
    
    
      contextConfigLocation
      classpath:spring-mvc.xml
    
    1
    
    true
  
  
    SpringMVC
    /
  

//zlj.tld



    
  zlj 1.1 core library
  zlj core
  1.1
  zlj
  http://jsp.veryedu.cn
  
  
  
    page
    com.zlj.tag.PageTag
    JSP
    
        pageBean
        true
        true
    
  
  

后台接口准备

ssm的增删改查

1.先逆向生成对应的类（model，mapper.xml，mapper.java）

2.biz层

3.web层（依托于自定义mvc的分页标签==>pom.xml）

4.前端

package com.zlj.model;

import lombok.ToString;

@ToString
public class Stu {
    private Integer sid;

    private String sname;

    private Integer sage;

    private String spic="暂无图片";

    public Stu(Integer sid, String sname, Integer sage, String spic) {
        this.sid = sid;
        this.sname = sname;
        this.sage = sage;
        this.spic = spic;
    }

    public Stu() {
        super();
    }

    public Integer getSid() {
        return sid;
    }

    public void setSid(Integer sid) {
        this.sid = sid;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public Integer getSage() {
        return sage;
    }

    public void setSage(Integer sage) {
        this.sage = sage;
    }

    public String getSpic() {
        return spic;
    }

    public void setSpic(String spic) {
        this.spic = spic;
    }
}

  
    
      
      
      
      
    
  
  
    sid, sname, sage, spic
  

  
    select
    
    from student
   
    
     and sname like concat('%' , #{sname} , '%')
    
    
  

  
    select
    
    from student
    where sid = #{sid,jdbcType=INTEGER}
  

  
    delete from student
    where sid = #{sid,jdbcType=INTEGER}
  
  
    insert into student (sid, sname, sage,
      spic)
    values (#{sid,jdbcType=INTEGER}, #{sname,jdbcType=VARCHAR}, #{sage,jdbcType=INTEGER},
      #{spic,jdbcType=VARCHAR})
  
  
    insert into student
    
      
        sid,
      
      
        sname,
      
      
        sage,
      
      
        spic,
      
    
    
      
        #{sid,jdbcType=INTEGER},
      
      
        #{sname,jdbcType=VARCHAR},
      
      
        #{sage,jdbcType=INTEGER},
      
      
        #{spic,jdbcType=VARCHAR},
      
    
  
  
    update student
    
      
        sname = #{sname,jdbcType=VARCHAR},
      
      
        sage = #{sage,jdbcType=INTEGER},
      
      
        spic = #{spic,jdbcType=VARCHAR},
      
    
    where sid = #{sid,jdbcType=INTEGER}
  
  
    update student
    set sname = #{sname,jdbcType=VARCHAR},
      sage = #{sage,jdbcType=INTEGER},
      spic = #{spic,jdbcType=VARCHAR}
    where sid = #{sid,jdbcType=INTEGER}
  

package com.zlj.mapper;

import com.zlj.model.Stu;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface StuMapper {
    int deleteByPrimaryKey(Integer sid);

    int insert(Stu record);

    int insertSelective(Stu record);

    Stu selectByPrimaryKey(Integer sid);

    int updateByPrimaryKeySelective(Stu record);

    int updateByPrimaryKey(Stu record);

    List selectByCon(Stu stu);
}

package com.zlj.biz;

import com.zlj.model.Stu;
import com.zlj.util.PageBean;

import java.util.List;

/**
 * @author zlj
 * @create 2023-09-07 17:09
 */
public interface StuBiz {

    int deleteByPrimaryKey(Integer sid);

    int insert(Stu record);

    int insertSelective(Stu record);

    Stu selectByPrimaryKey(Integer sid);

    int updateByPrimaryKeySelective(Stu record);

    int updateByPrimaryKey(Stu record);

    List ListPager(Stu stu, PageBean PageBean);
}

package com.zlj.biz.Impl;

import com.zlj.biz.StuBiz;
import com.zlj.mapper.StuMapper;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author zlj
 * @create 2023-09-08 14:52
 */
@Service
public class StuBizImpl implements StuBiz {
@Autowired
private StuMapper stuMapper;
    @Override
    public int deleteByPrimaryKey(Integer sid) {
        return stuMapper.deleteByPrimaryKey(sid);
    }

    @Override
    public int insert(Stu record) {
        return stuMapper.insert(record);
    }

    @Override
    public int insertSelective(Stu record) {
        return stuMapper.insertSelective(record);
    }

    @Override
    public Stu selectByPrimaryKey(Integer sid) {
        return stuMapper.selectByPrimaryKey(sid);
    }

    @Override
    public int updateByPrimaryKeySelective(Stu record) {
        return stuMapper.updateByPrimaryKeySelective(record);
    }

    @Override
    public int updateByPrimaryKey(Stu record) {
        return stuMapper.updateByPrimaryKey(record);
    }

    @Override
    public List ListPager(Stu stu, PageBean pageBean) {
        return stuMapper.selectByCon(stu);
    }


}

package com.zlj.web;

import com.zlj.biz.StuBiz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

/**
 * @author zlj
 * @create 2023-09-08 16:55
 */
@Controller
@RequestMapping("/stu")
public class StuController {
    @Autowired
    private StuBiz stuBiz;

    //    增
    @RequestMapping("/add")
    public String add(Stu stu,HttpServletRequest request) {
        int i = stuBiz.insert(stu);
        return "redirect:list";
    }

    //            删
    @RequestMapping("/del/{sid}")
    public String del(@PathVariable("sid") Integer sid) {
        stuBiz.deleteByPrimaryKey(sid);
        return "redirect:/stu/list";
    }

//        改
@RequestMapping("/edit")
public String edit(Stu stu) {
    stuBiz.updateByPrimaryKeySelective(stu);
    return "redirect:list";
}
//                查
    @RequestMapping("/list")
    public String list(Stu stu, HttpServletRequest request) {
        //stu是用来接收前台传递后台的参数
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        List stus = stuBiz.ListPager(stu, pageBean);
        request.setAttribute("lst", stus);
        request.setAttribute("pageBean", pageBean);
//      WEB-INF/jsp/stu/list.jsp
        return "stu/list";

    }

    //数据回显
    @RequestMapping("/preSave")
    public String preSave(Stu stu, Model model) {
        if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
            Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
            model.addAttribute("s", s);
        }
        return "stu/edit";
    }
}

<%@ page language="java"
         pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>



    
    



    学生id:

    学生姓名:

    学生年龄:

    学生图片:

    

//list.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>



    
    




    

        
        
        
        <%--        --%>
    
    查询
    新增



        

    

    

        
学生id
        
学生姓名
        
学生年龄
        
学生图片
        
操作
    
    
    

    

            
${s.sid }
            
${s.sname }
            
${s.sage }
            
${s.spic }
            

                修改
                删除
            
        
    
    

<%--
  Created by IntelliJ IDEA.
  User: 朱
  Date: 2023/9/8
  Time: 23:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


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