AJAX实现数据的增删改查操作详解

本文实例讲述了AJAX实现数据的增删改查操作。分享给大家供大家参考，具体如下：

主页：index.html

 
 
 
 
 
 
 编号：

 姓名：

 性别：男：女：

 年龄：
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
 

 身高：

 体重：

 
 

 

 

 
 编号：
 
 

  

  
编号
  
姓名
  
性别
  
年龄
  
身高
  
体重
  
  

  

  

  

  

  

  

  
 
 
 
 

 

 

 编号：
 
 
 

 

 

 编号：

 姓名：

 性别：男：女：

 年龄：
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
 

 身高：

 体重：

 
 
 
 
 

增加的Serlvet：Hello.java

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;
 

@WebServlet("/Hello")
public class Hello extends HttpServlet {
 private static final long serialVersionUID = 1L;
    
  
  public Hello() {
    super();
    // TODO Auto-generated constructor stub
  }
 
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 // TODO Auto-generated method stub
 response.getWriter().append("Served at: ").append(request.getContextPath());
 }
 
 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
 response.setCharacterEncoding("utf-8");
 response.setContentType("application/json; charset=utf-8");
 
 String pno = request.getParameter("pno");
 String name = request.getParameter("name");
 String sex = request.getParameter("sex");
 String age = request.getParameter("age");
 String height = request.getParameter("height");
 String weight = request.getParameter("weight");
 
 String sqlInsert = "INSERT INTO Person (Pno,Pname,Psex,Page,Pheight,Pweight) VALUES('";
 sqlInsert += pno +"','";
 sqlInsert += name +"','";
 sqlInsert += sex +"',";
 sqlInsert += age +",";
 sqlInsert += height +",";
 sqlInsert += weight +")";
 
 int message = MysqlUtil.add(sqlInsert);
 String rep = "";
 if(message == 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);
 
 
 }
 
}

删除的Servlet：HelloDelete.java

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;
 

@WebServlet("/HelloDelete")
public class HelloDelete extends HttpServlet {
 private static final long serialVersionUID = 1L;
    
  
  public HelloDelete() {
    super();
    // TODO Auto-generated constructor stub
  }
 
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 // TODO Auto-generated method stub
 response.getWriter().append("Served at: ").append(request.getContextPath());
 }
 
 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 response.setCharacterEncoding("utf-8");
 response.setContentType("application/json; charset=utf-8");
 
 String pno = request.getParameter("pno");
 
 
 String sqlDel = "delete from Person where pno="+pno;
 
 
 int message = MysqlUtil.del(sqlDel);
 String rep = "";
 if(message == 1) {
  rep = "{"code":"200","message":"成功删除"}";
 }else {
  rep = "{"code":"999","message":"删除失败"}";
 }
 response.getWriter().write(rep);
 }
 
}

更新的Servlet：HelloUpdate.java

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;
 

@WebServlet("/HelloUpdate")
public class HelloUpdate extends HttpServlet {
 private static final long serialVersionUID = 1L;
    
  
  public HelloUpdate() {
    super();
    // TODO Auto-generated constructor stub
  }
 
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 // TODO Auto-generated method stub
 response.getWriter().append("Served at: ").append(request.getContextPath());
 }
 
 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 response.setCharacterEncoding("utf-8");
 response.setContentType("application/json; charset=utf-8");
 
 String pno = request.getParameter("pno");
 String name = request.getParameter("name");
 String sex = request.getParameter("sex");
 String age = request.getParameter("age");
 String height = request.getParameter("height");
 String weight = request.getParameter("weight");
 
 String sqlupdate = "update Person set ";
// sqlupdate += "Pno='"+ pno +"',";
 sqlupdate += "Pname='"+ name +"',";
 sqlupdate += "Psex='"+ sex +"',";
 sqlupdate += "Page="+ age +",";
 sqlupdate += "Pheight="+ height +",";
 sqlupdate += "Pweight="+ weight;
 sqlupdate += " where Pno='"+pno+"'";
 System.out.println(sqlupdate);
 int message = MysqlUtil.update(sqlupdate);
 String rep = "";
 if(message == 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);
 
 }
 
}

查询的Servlet：HelloQuery.java

package com.web;
 
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
 
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;
 

@WebServlet("/HelloQuery")
public class HelloQuery extends HttpServlet {
 private static final long serialVersionUID = 1L;
    
  
  public HelloQuery() {
    super();
    // TODO Auto-generated constructor stub
  }
 
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 // TODO Auto-generated method stub
 response.getWriter().append("Served at: ").append(request.getContextPath());
 }
 
 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 response.setCharacterEncoding("utf-8");
 response.setContentType("application/json; charset=utf-8");
 String pno = request.getParameter("pno");
 String[] params = {"Pno","Pname","Psex","Page","Pheight","Pweight"};
 String sql = "select * from Person where Pno="+pno;
 String data = "{";
 
 String[] str = {"编号","姓名","性别","年龄","身高","体重"};
 List> listmap = new ArrayList<>();
 listmap = MysqlUtil.show(sql, params);
 for(int i =0 ; i

页面如下：

对应的数据库：

 git克隆地址：https://github.com/dreamiboy/JDBCUtil.git
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