extjs+servlet填充gird实现增删改查

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extjs+servlet填充gird实现增删改查

2024-08-05 11:11:30 216人阅读
由于项目工程中还有许多其他的练习，不好讲项目上传！
下面只说和本文章相关的代码
usergrid.jsp
js也写在其中了所以会有点乱
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href=http://www.mamicode.com/"">>
DBConnection.java
package com.nuoxin.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBConnection {

	private static Connection connection;
	private static Statement statement;
	private static ResultSet resultSet;

	public static Connection getConnection() {
		try {
			try {
				Class.forName("com.mysql.jdbc.Driver");
				System.out.println("加载驱动");

			} catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			connection = DriverManager
					.getConnection(
							"jdbc:mysql://localhost:3306/user",
							"root", "root");
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			System.out.println("数据库连接失败");
			e.printStackTrace();
		}
		return connection;

	}

	public static Statement getStatement() {
		try {
			statement = getConnection().createStatement();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return statement;

	}

	public static ResultSet getResultSet(String sql) {
		try {
			resultSet = getStatement().executeQuery(sql);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return resultSet;
	}

	
	public static void close(){
		if (resultSet != null) {
			try {
				resultSet.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
		if (statement != null) {
			try {
				statement.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
		if (connection != null) {
			try {
				connection.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
		
	}

	public static void main(String[] args) throws SQLException {

		ResultSet rs = getResultSet("select * from users");

		while (rs.next()) {
			try {
				System.out.println(rs.getString("name"));
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}

	}
}

UserSerivce.java
package com.iss.service;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.nuoxin.pojo.Users;
import com.nuoxin.util.DBConnection;

public class UserService {

	// 修改用户
	public static void updateUser(Users user) {
		String sql = "update users set name='" + user.getName() + "',sex='"
				+ user.getSex() + "',age='" + user.getAge() + "' where id="
				+ user.getId() + "";

		try {
			Statement statement = DBConnection.getStatement();
			statement.executeUpdate(sql);
			DBConnection.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	// 删除用户
	public static void deleteUser(Users users) {
		String sql = "delete from users where id=" + users.getId() + "";
		try {
			DBConnection.getStatement().executeUpdate(sql);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		DBConnection.close();
	}

	// 添加用户

	public static void addUser(Users user) {
		String sql = "insert into users values(null,'" + user.getName() + "','"
				+ user.getSex() + "','" + user.getAge() + "')";
		try {
			DBConnection.getStatement().executeUpdate(sql);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		DBConnection.close();
	}

	public static Users getUser(int id) {
		String sql = "select * from users where id=" + id;
		Users user = null;
		ResultSet resultSet = DBConnection.getResultSet(sql);

		try {
			while (resultSet.next()) {
				user = new Users();
				user.setId(resultSet.getInt("id"));
				user.setName(resultSet.getString("name"));
				user.setAge(resultSet.getString("sex"));
				user.setSex(resultSet.getString("age"));

			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return user;

	}

}

几个servlet
getUsersServlet
package com.nuoxin.servlet;


import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;


import javax.naming.LimitExceededException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.nuoxin.util.DBConnection;


public class GetUsersServlet extends HttpServlet {


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


doPost(request, response);
}


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


response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
request.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();


StringBuilder stringBuilder;


String start = request.getParameter("start");
System.out.println("start:" + start);
String limit = request.getParameter("limit");
System.out.println("limit:" + limit);


String query = request.getParameter("query");
System.out.println(query);


// 判断条件
String countSql = "select count(*) from users ";
String selectSql = "select * from users limit " + start + "," + limit
+ "";
if (query != null && !"".equals(query)) {
query = new String(query.getBytes("iso-8859-1"), "utf-8");
System.out.println("query:" + query);
countSql += " where name=‘" + query + "‘;";
System.out.println(countSql);
selectSql = "select * from users where name=‘" + query + "‘ limit "
+ start + "," + limit + "";
System.out.println(selectSql);


}


int total = 0;


ResultSet resultSet = DBConnection.getResultSet(countSql);


// 添加异常快捷键 alt+shift+z
try {
while (resultSet.next()) {
total = resultSet.getInt(1);
System.out.println("total:" + total);


}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


ResultSet rs = DBConnection.getResultSet(selectSql);


stringBuilder = new StringBuilder();


// 拼接json字符串 jdbc中下标从1开始
stringBuilder.append("{totalCount:" + total + ",bugs:[");
try {
while (rs.next()) {


stringBuilder.append("{");
stringBuilder.append("id:" + "\‘" + rs.getInt(1) + "\‘,");
stringBuilder.append("name:" + "\‘" + rs.getString(2) + "\‘,");
stringBuilder.append("sex:" + "\‘" + rs.getString(3) + "\‘,");
stringBuilder.append("age:" + "\‘" + rs.getString(4) + "\‘");
stringBuilder.append("},");


}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


String json = null;
if (total != 0) {
json = stringBuilder.substring(0, stringBuilder.length() - 1);
}
// json = stringBuilder.substring(0, stringBuilder.length());
// json += "]}";
json = stringBuilder.append("]}").toString();
System.out.println("json:" + json);


out.print(json);


out.flush();
out.close();
}


}

getUserServlet  这个是修改用户时在userForm中加载用户
package com.nuoxin.servlet;


import java.io.IOException;
import java.io.PrintWriter;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import net.sf.json.JSONArray;


import com.iss.service.UserService;
import com.nuoxin.pojo.Users;
import com.nuoxin.util.DBConnection;


public class GetUserServlet extends HttpServlet {


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


doPost(request, response);
}


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


response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();


int userId = Integer.parseInt(request.getParameter("userId"));
System.out.println("userId：" + userId);
Users user = UserService.getUser(userId);
// JSONArray jsonArray = JSONArray.fromObject(user);


System.out.println("{success:true,data:" + user + "}");
out.print("{success:true,data:" + user + "}");
// out.print("{success:true,data:{age:‘22‘,id:46,name:‘22‘,sex:‘22‘}}");
out.flush();
out.close();
}
}
addUserSevlet
package com.nuoxin.servlet;


import java.io.IOException;
import java.io.PrintWriter;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.iss.service.UserService;
import com.nuoxin.pojo.Users;


public class AddUserServlet extends HttpServlet {


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


doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();

String name = request.getParameter("name");
String sex = request.getParameter("sex");
String age = request.getParameter("age");

Users user=new Users();
user.setName(name);
user.setSex(sex);
user.setAge(age);
System.out.println("name:"+user.getName());
UserService.addUser(user);
out.print("{success:true}");

out.flush();
out.close();
}


}
deleteUserServlet  这里要注意引入解析json的包
package com.nuoxin.servlet;


import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.iss.service.UserService;
import com.nuoxin.pojo.Users;


import net.sf.json.JSONArray;
import net.sf.json.JSONObject;


public class DeleteUserServlet extends HttpServlet {


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


doPost(request, response);
}


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


response.setContentType("text/html");
PrintWriter out = response.getWriter();


String deleteUsers = request.getParameter("deleteUsers");
System.out.println("deleteUsers:"+deleteUsers);

JSONArray jsonArray = JSONArray.fromObject(deleteUsers);
for (int i = 0; i < jsonArray.size(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
UserService.deleteUser((Users) JSONObject.toBean(jsonObject,
Users.class));


}

out.print("{success:true}");


out.flush();
out.close();
}


}

updateUserServlet
package com.nuoxin.servlet;


import java.io.IOException;
import java.io.PrintWriter;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.iss.service.UserService;
import com.nuoxin.pojo.Users;
import com.nuoxin.util.DBConnection;


public class UpdateUserServlet extends HttpServlet {


public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}


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


response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();


int id = Integer.parseInt(request.getParameter("id"));


Users user = UserService.getUser(id);


user.setName(request.getParameter("name"));
user.setAge(request.getParameter("age"));
user.setSex(request.getParameter("sex"));


UserService.updateUser(user);
out.print("{success:true}");


out.flush();
out.close();
}


}

点击打开链接这是整个项目链接地址





extjs+servlet填充gird实现增删改查
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extjs+servlet填充gird实现增删改查

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