在网页对数据库进行增删改查

首先要对项目导jar包                              编写页面代码

	姓名： 

	性别：男： 女 

	工作： 

	肤色： 

	年龄：	
	
		
		






	
	



	

package com.web;

import java.io.IOException;
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 com.mysql.MysqlUtil;

/**
 * Servlet implementation class Ser2
 */
@WebServlet("/Ser2")
public class Ser2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Ser2() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("zhangdazhong ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		response.setCharacterEncoding("utf-8");
		response.setContentType("application/json; charset=utf-8");
		
		String name = request.getParameter("name");
		String sex = request.getParameter("sex");
		String job = request.getParameter("job");
		String fuse = request.getParameter("fuse");
		String age = request.getParameter("age");
		
		String addsql = "insert into person (pername,sex,job,fuse,age) values ('"+name+"','"+sex+"','"+job+"','"+fuse+"',"+age+")";
		System.out.println("addsql:"+addsql);
		int result = MysqlUtil.add(addsql);
		
		String rep = "";
		if( result == 1) {
			
			rep = "{\"code\":\"200\",\"message\":\"成功插入数据库\"}";
		}else {
			
			rep = "{\"code\":\"999\",\"message\":\"插入失败了\"}";
		}
		
	
		response.getWriter().write(rep);
		
		
	}

package com.mysql;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.model.Person;

public class MysqlUtil {

//	public static void main(String[] args) {
//		// TODO Auto-generated method stub
//		String sqlstr = "INSERT  INTO student  (stuname,class,sex,major,mathstore,engstore,yuwenstore) VALUES('";
//		
//		sqlstr += "赵大众','大四1班','2','计算机专业','50','80','100')";
//	
//		String delstr = " insert into student (stuname,class,sex,major,mathstore) values ('彭小杰','初三','1','全专业',90) ";
//		
//	
//		System.out.println(add(delstr));
//	}
//	
	
    
    //插入操作
    public static int add(String sql) {
        int i=0;
     
        DBConnection db = new DBConnection();
        try {        
            PreparedStatement preStmt = (PreparedStatement) db.conn.prepareStatement(sql);
            preStmt.executeUpdate();
            //Statement statement = (Statement) db.conn.createStatement();
            //statement.executeUpdate(sql);
            
            preStmt.close();
            db.close();//关闭连接 
            i = 1;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return i;//返回影响的行数，1为执行成功
    }
    
    //查找操作
    public static List< Map > show(String sql, String[] params){
        // String sql ="select * from employee";
    	
    	
    	List< Map > listmap = new ArrayList<>();
    	
         DBConnection db = new DBConnection();
         ResultSet rs = null;
         System.out.println("-----------------");
         System.out.println("姓名" +"\t"+ "邮箱" +"\t"+ "日期");
         System.out.println("-----------------");
         
         try {
            Statement stmt = (Statement) db.conn.createStatement();
            rs = (ResultSet) stmt.executeQuery(sql);
            while(rs.next()){
            	
            	Map map = new HashMap();
            	for(int i = 0; i < params.length; i++) {
            		
            		map.put(params[i], rs.getString(params[i]));
            	}
            	listmap.add(map);
            }
            rs.close();
            db.close();//关闭连接 
        } catch (SQLException e) {
            e.printStackTrace();
        }
		return listmap; 
         
     
    }
    //更新操作
    public static int update( String sql ) {
        int i =0;
       // String sql="update employee set email=?,pwd=? where name=?";
        DBConnection db = new DBConnection();
        
        try {
            PreparedStatement preStmt = (PreparedStatement) db.conn.prepareStatement(sql);
//            preStmt.setString(1, uemail);
//            preStmt.setString(2, upwd);
//            preStmt.setString(3, uname);
            preStmt.executeUpdate();
            
            preStmt.close();
            db.close();//关闭连接 
            i = 1;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return i;//返回影响的行数，1为执行成功
    }
    //删除操作
    public static int del(String sql) {
        int i=0;
      //  String sql="delete from employee where name=?";
        DBConnection db = new DBConnection();
        try {    
            PreparedStatement preStmt = (PreparedStatement) db.conn.prepareStatement(sql);
         
            preStmt.executeUpdate();
            
            preStmt.close();
            db.close();//关闭连接 
            
            i = 1;
        } catch (SQLException e){
            e.printStackTrace();
        }
        return i;//返回影响的行数，1为执行成功
    }
    
    
    public static List