Ext与后台数据库交互

新建个user.js 里面放入一下内容:

Ext.onReady(function() {

 var record_start = 0;

 var num = function(v,p,Record,rowIndex){
  return record_start + rowIndex + 1;
 };

 function renderSex(value) {
  if (value == '1') {

   return "先生";
  } else {

   return "女士";
  }
 }

    var comboSex = [
        ['0','女'],
        ['1','男']
    ];

 var sm = new Ext.grid.CheckboxSelectionModel({
  handleMouseDown : Ext.emptyFn
 });                  // 创建复选框

 var cm = new Ext.grid.ColumnModel([new Ext.grid.RowNumberer({
  renderer : num
 }), // 创建自动行号
   sm, {
    header : '姓名',
    dataIndex : 'stuName',
    editor : new Ext.grid.GridEditor(new Ext.form.TextField({
     allowBlank : false
    })),
    sortable : true
   },  {
    header : '性别',
    dataIndex : 'stuSex',
    editor : new Ext.grid.GridEditor(new Ext.form.ComboBox({
     store : new Ext.data.SimpleStore({
      fields : ['value', 'text'],
      data : comboSex
     }),
     emptyText : '请选择',
     mode : 'local',
     triggerAction : 'all',
     valueField : 'value',
     displayField : 'text',
     readOnly : true
    })),
    renderer : renderSex,
    sortable : true
   }, {
    header : '年龄',
    dataIndex : 'stuAge',
    editor : new Ext.grid.GridEditor(new Ext.form.NumberField({
     allowBlank : false
    })),
    sortable : true
   }, {
    header : '住址',
    dataIndex : 'stuAddr',
    editor : new Ext.grid.GridEditor(new Ext.form.TextField({
     allowBlank : false
    })),
    sortable : true
   }, {
    header : '电话',
    dataIndex : 'stuTel',
    editor : new Ext.grid.GridEditor(new Ext.form.NumberField({
     allowBlank : false
    })),
    sortable : true
   }]);


 // 定义类型
 var Record = Ext.data.Record.create([{
  name : 'stuId',
  type : 'int'
 }, {
  name : 'clsId',
  type : 'int'
 }, {
  name : 'stuSex',
  type : 'int'
 }, {
  name : 'stuName',
  type : 'string'
 }, {
  name : 'stuAge',
  type : 'int'
 },{
  name : 'stuAddr',
  type : 'string'
 },{
  name : 'stuTel',
  type : 'String'
 }]);

 var store = new Ext.data.Store({

  proxy : new Ext.data.HttpProxy({
   url : 'servlet/Query'
  }),

  pruneModifiedRecords: true,

  reader : new Ext.data.JsonReader({

   totalProperty : 'totalProperty',
   root : 'root'
  }, [{
   name : 'stuId'
  }, {
   name : 'clsId'
  }, {
   name : 'stuSex'
  }, {
   name : 'stuName'
  }, {
   name : 'stuAge'
  }, {
   name : 'stuAddr'
  }, {
   name : 'stuTel'
  }])
 });

 // var grid = new Ext.grid.GridPanel({ // 不可编辑的grid

 var grid = new Ext.grid.EditorGridPanel({ // 可编辑的grid

  title : '学生信息管理',
  autoHeight : true,
  cm : cm,
  sm : sm,
  renderTo : 'grid',
  store : store,
  // 分页底端显示工具条
  bbar : new Ext.PagingToolbar({
   pageSize : 10,
   displayInfo : true,
   store : store,
   displayMsg : '显示第{0}条到{1}条记录，一共{2}条',
   emptyMsg : '没有记录',
   doLoad: function(start){
    record_start = start;
    var o = {},pn = this.paramNames;
    o[pn.start] = start;
    o[pn.limit] = this.pageSize;
    this.store.load({params:o});
   }
  }),

  // 添加与删除顶端显示工具条
  tbar : new Ext.Toolbar(['-', {

   text : '添加一行',
   handler : function() {

    var p = new Record({
     stuId : '',
     clsId: '1',
     stuSex : '',
     stuName : '',
     stuAge : '',
     stuAddr : '',
     stuTel: ''
    });
    grid.stopEditing();
    store.insert(0, p);
    grid.startEditing(0, 2);
   }
  }, '-', {
   text : '删除一行',
   handler : function() {
    Ext.Msg.confirm('信息', '确定要删除？', function(btn) {
     if (btn == 'yes') {
      var cells = sm.getSelections();
      var jsonArray = [];
      for (var i = 0; i < cells.length; i++) {

       jsonArray.push(cells[i].data);
//        store.remove(cells[i]);
      }
      Ext.lib.Ajax.request('POST', 'servlet/Del', {
       success : function(response) {
        Ext.Msg.alert('信息', response.responseText,
          function() {
           store.reload();
          });
       },
       failure : function() {
        Ext.Msg.alert("错误", "与后台联系的时候出现了问题");
       }
      }, 'data=' + encodeURIComponent(Ext.encode(jsonArray)));
     }
    });
   }
  }, '-', {
            text: '保存',
            handler: function(){
                var m = store.modified.slice(0);
                var jsonArray = [];
                Ext.each(m, function(item) {
                    jsonArray.push(item.data);
                });

                Ext.lib.Ajax.request(
                    'POST',
                    'servlet/Save',
                    {success: function(response){
                        Ext.Msg.alert('信息', response.responseText, function(){
                            store.reload();
                        });
                    },failure: function(){
                        Ext.Msg.alert("错误", "与后台联系的时候出现了问题");
                    }},
                    'data=' + encodeURIComponent(Ext.encode(jsonArray))
                );
            }
        }, '-']),

  viewConfig : {
   forceFit : true
  }

 });

 store.load({
  params : {
   start : 0,
   limit : 10
  }
 });
});

新建个index.jsp页面 放入以下内容:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>



  

    

 

 

 

 

 

 

  

  
    

  

配置下web.xml

 xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  
    This is the description of my J2EE component
    This is the display name of my J2EE component
    Query
    ext.servlet.Query
  
  
    This is the description of my J2EE component
    This is the display name of my J2EE component
    Save
    ext.servlet.Save
  
  
    This is the description of my J2EE component
    This is the display name of my J2EE component
    Del
    ext.servlet.Del
  
  
    This is the description of my J2EE component
    This is the display name of my J2EE component
    GetCls
    ext.servlet.GetCls
  

  
    Query
    /servlet/Query
  
  
    Save
    /servlet/Save
  
  
    Del
    /servlet/Del
  
  
    GetCls
    /servlet/GetCls
  
  
    index.jsp
  

上面的web.xml是自动生成的......

后台的实现: dao

basedao:

package ext.dao;

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

public class BaseDao {

 public final String url = "jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8";

 public final String user = "root";

 public final String pwd = "root";

 private Connection conn = null;

 private ResultSet rs = null;

 public PreparedStatement pstm = null;

 public BaseDao() {
  try {
   Class.forName("com.mysql.jdbc.Driver");
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }

 }

 /**
  *
  * @Function getConnection()
  * @return Connection
  */
 public Connection getConnection() {

  try {
   conn = DriverManager.getConnection(url, user, pwd);
   return conn;
  } catch (SQLException e) {

   e.printStackTrace();
   return null;
  }
 }

 /**
  *
  * @Function closePreparedStatement()
  */
 public void closePreparedStatement() {
  try {
   this.pstm.close();
  } catch (SQLException e) {

   e.printStackTrace();
  }
 }

 /**
  *
  * @Function closeConnection()
  */
 public void closeConnection() {
  try {
   this.conn.close();
  } catch (SQLException e) {

   e.printStackTrace();
  }
 }

 /**
  *
  * @Function exectueQuery()
  * @param sql
  * @return ResultSet
  */
 public ResultSet exectueQuery(String sql) {

  conn = this.getConnection();
  try {
//   pstm = conn.prepareStatement(sql);
   rs = pstm.executeQuery();
  } catch (SQLException e) {

   e.printStackTrace();
  }
  return rs;
 }

 /**
  *
  * @Function executeUpdate()
  * @throws SQLException
  */
 public void executeUpdate() throws SQLException {

  pstm.executeUpdate();

  this.closePreparedStatement();

  this.closeConnection();
 }

 /**
  *
  * @Function executeDelete()
  * @throws SQLException
  */
 public void executeDelete() throws SQLException {

  pstm.executeUpdate();

  this.closePreparedStatement();

  this.closeConnection();
 }

 /**
  *
  * @Function executeInsert()
  * @throws SQLException
  */
 public void executeInsert() throws SQLException {

  pstm.executeUpdate();

  this.closePreparedStatement();

  this.closeConnection();
 }

 /**
  *
  * @Function preparedStatement()
  * @param sql
  * @throws SQLException
  */
 public void preparedStatement(String sql) throws SQLException {

  conn = this.getConnection();

  pstm = conn.prepareStatement(sql);
 }
}

userdao:

package ext.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import ext.po.Clasz;
import ext.po.User;

public class UserDao extends BaseDao {
 public UserDao() {
 }

 /**
  *
  * @Function getUser()
  * @return List
  * @throws SQLException
  */
 public List getUser(int start, int limit) {

  String sql = "select * from student LIMIT ?,?";

  try {
   this.preparedStatement(sql);

   pstm.setInt(1, start);

   pstm.setInt(2, limit);
  } catch (SQLException e1) {
   e1.printStackTrace();
  }

  List list = new ArrayList();

  User user = null;

  ResultSet rs = this.exectueQuery(sql);

  try {
   while (rs.next()) {

    user = new User();

    user.setStuId(rs.getInt("stu_id"));
    user.setClsId(rs.getInt("cls_id"));
    user.setStuName(rs.getString("stu_name"));
    user.setStuSex(rs.getInt("stu_sex"));
    user.setStuAge(rs.getInt("stu_age"));
    user.setStuAddr(rs.getString("stu_addr"));
    user.setStuTel(rs.getString("stu_tel"));

    list.add(user);
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }
  this.closePreparedStatement();

  this.closeConnection();

  return list;

 }

 /**
  *
  * @return
  */
 public int getCount() {

  String sql = "select count(*) from student";

  try {
   this.preparedStatement(sql);

   ResultSet rs = this.exectueQuery(sql);

   while (rs.next()) {

    return rs.getInt(1);
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }

  return 0;
 }

 /**
  *
  * @Function addUser()
  * @param user
  * @throws SQLException
  */
 public void addUser(User user) throws SQLException {

  String sql = "insert into student(cls_id,stu_name,stu_sex,stu_age,stu_addr,stu_tel) values(?,?,?,?,?,?)";

  this.preparedStatement(sql);

  pstm.setInt(1, user.getClsId());
  pstm.setString(2, user.getStuName());
  pstm.setInt(3, user.getStuSex());
  pstm.setInt(4, user.getStuAge());
  pstm.setString(5, user.getStuAddr());
  pstm.setString(6, user.getStuTel());

  this.executeInsert();
 }

 /**
  *
  * @Function editUser()
  * @param user
  * @throws SQLException
  */
 public void editUser(User user) throws SQLException {

  String sql = "update student set stu_name=?," + "stu_sex=?," + "stu_age=?," + "stu_addr=?," + "stu_tel=? "
    + "where stu_id=?";

  this.preparedStatement(sql);

  pstm.setString(1, user.getStuName());
  pstm.setInt(2, user.getStuSex());
  pstm.setInt(3, user.getStuAge());
  pstm.setString(4, user.getStuAddr());
  pstm.setString(5, user.getStuTel());
  pstm.setInt(6, user.getStuId());

  this.executeUpdate();
 }

 /**
  *
  * @Function deleteUser()
  * @param user
  * @throws SQLException
  */
 public void deleteUser(Integer id) throws SQLException {

  String sql = "delete  from student where stu_id=?";

  this.preparedStatement(sql);

  pstm.setInt(1, id);

  this.executeDelete();
 }

 /**
  *
  * function : 获取班级列表
  *
  * @return
  *
  * @author wxl Jul 17, 2009
  */
 public List getClassList() {

  List list = new ArrayList();

  String sql = "select * from class order by cls_cdate desc";

  try {

   this.preparedStatement(sql);

   ResultSet rs = this.exectueQuery(sql);

   while (rs.next()) {

    Clasz cls = new Clasz();

    cls.setClsId(rs.getInt("cls_id"));
    cls.setClsName(rs.getString("cls_name"));

    list.add(cls);
   }

  } catch (Exception ex) {

  }

  return list;
 }
}

bo实现

package ext.bo;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;

import ext.dao.UserDao;
import ext.po.Clasz;
import ext.po.User;

public class UserBo {

 /**
  *
  * function : 从数据库获取数据并转化成json数据
  *
  * @param start
  *            开始位置
  * @param limit
  *            每页条数
  * @return
  *
  * @author wxl Jul 16, 2009
  */
 public String getJsonData(int start, int limit) {

  UserDao uDao = new UserDao();

  List list = uDao.getUser(start, limit);

  StringBuffer sb = new StringBuffer();

  int count = uDao.getCount();

  sb.append("{totalProperty:");

  sb.append(count);

  sb.append(",root:[");

  for (User user : list) {
   sb.append("{");
   sb.append("stuId:" + user.getStuId() + ",");
   sb.append("clsId:" + user.getClsId() + ",");
   sb.append("stuSex:" + user.getStuSex() + ",");
   sb.append("stuName:'" + user.getStuName() + "',");
   sb.append("stuAge:" + user.getStuAge() + ",");
   sb.append("stuAddr:'" + user.getStuAddr() + "',");
   sb.append("stuTel:'" + user.getStuTel() + "'");
   sb.append("},");
  }
  sb.append("]}");

  return sb.substring(0, sb.lastIndexOf(",")) + sb.substring(sb.lastIndexOf(",") + 1);
 }

 /**
  *
  * function : 保存或修改数据
  *
  * @param data
  *
  * @author wxl Jul 17, 2009
  */
 public void saveOrUpdate(String jsonData) {

  UserDao uDao = new UserDao();

  List list = this.getUserFromJson(jsonData);
  try {
   if (list != null && list.size() > 0) {

    for (User user : list) {

     if (user.getStuId() != null && !"".equals(user.getStuId())) {

      uDao.editUser(user);

     } else {
      uDao.addUser(user);
     }
    }
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }
 }

 /**
  *
  * function : 把Json数据转化成List
  *
  * @param jsonData
  * @return
  *
  * @author wxl Jul 17, 2009
  */
 private List getUserFromJson(String jsonData) {

  List list = new ArrayList();

  try {
   org.json.JSONArray array = new JSONArray(jsonData);

   for (int i = 0; i < array.length(); i++) {

    org.json.JSONObject jo = new org.json.JSONObject(array.get(i).toString());

    User uPo = new User();

    // 班级id
    uPo.setClsId(Integer.parseInt(jo.getString("clsId")));

    // 住址
    uPo.setStuAddr(jo.getString("stuAddr"));

    // 年龄
    String stuAge = jo.getString("stuAge");
    if (stuAge != null && !"".equals(stuAge)) {
     uPo.setStuAge(Integer.parseInt(stuAge));
    } else {
     uPo.setStuAge(0);
    }

    // 姓名
    uPo.setStuName(jo.getString("stuName"));

    // 性别
    String stuSex = jo.getString("stuSex");
    if (stuSex != null && !"".equals(stuSex)) {
     uPo.setStuSex(Integer.parseInt(stuSex));
    } else {
     uPo.setStuSex(0);
    }

    // 电话
    uPo.setStuTel(jo.getString("stuTel"));

    // 学生id
    String stuId = jo.getString("stuId");
    if (stuId != null && !"".equals(stuId)) {

     uPo.setStuId(Integer.parseInt(stuId));

    }
    list.add(uPo);
   }

  } catch (JSONException e) {
   e.printStackTrace();
  }
  return list;
 }

 /**
  *
  * function : 删除数据
  *
  * @param jsonData
  *
  * @author wxl Jul 17, 2009
  */
 public void delUser(String jsonData) {

  UserDao uDao = new UserDao();

  List list = this.getUserFromJson(jsonData);
  try {
   if (list != null && list.size() > 0) {

    for (User user : list) {

     if (user.getStuId() != null && !"".equals(user.getStuId())) {

      uDao.deleteUser(user.getStuId());
     }
    }
   }
  } catch (Exception ex) {
   ex.printStackTrace();
  }
 }

 /**
  *
  *function: 获取班级的json数据
  *
  * @return
  *
  *@author wxl Jul 17, 2009
  */
 public String getClsJsonData() {

  UserDao uDao = new UserDao();

  List list = uDao.getClassList();

  StringBuffer sb = new StringBuffer();

  sb.append("[");

  if (list != null && list.size() > 0) {

   for (Clasz clasz : list) {
    sb.append("['");
    sb.append(clasz.getClsId() + "','");
    sb.append(clasz.getClsName() + "'");
    sb.append("],");
   }

  }
  sb.append("]");
  return sb.substring(0, sb.lastIndexOf(",")) + sb.substring(sb.lastIndexOf(",") + 1);
 }
}

formbean::实现

package ext.po;

public class User {

 private Integer stuId;

 private Integer clsId;

 private String stuName;

 private Integer stuSex;

 private Integer stuAge;

 private String stuAddr;

 private String stuTel;

 public Integer getStuId() {
  return stuId;
 }

 public void setStuId(Integer stuId) {
  this.stuId = stuId;
 }

 public Integer getClsId() {
  return clsId;
 }

 public void setClsId(Integer clsId) {
  this.clsId = clsId;
 }

 public String getStuName() {
  return stuName;
 }

 public void setStuName(String stuName) {
  this.stuName = stuName;
 }

 public Integer getStuSex() {
  return stuSex;
 }

 public void setStuSex(Integer stuSex) {
  this.stuSex = stuSex;
 }

 public Integer getStuAge() {
  return stuAge;
 }

 public void setStuAge(Integer stuAge) {
  this.stuAge = stuAge;
 }

 public String getStuAddr() {
  return stuAddr;
 }

 public void setStuAddr(String stuAddr) {
  this.stuAddr = stuAddr;
 }

 public String getStuTel() {
  return stuTel;
 }

 public void setStuTel(String stuTel) {
  this.stuTel = stuTel;

另外个formbean:

package ext.po;

public class Clasz {

 private Integer clsId;

 private String clsName;

 public Integer getClsId() {
  return clsId;
 }

 public void setClsId(Integer clsId) {
  this.clsId = clsId;
 }

 public String getClsName() {
  return clsName;
 }

 public void setClsName(String clsName) {
  this.clsName = clsName;
 }
}

 }
}

util实现:

package ext.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

public class JsonUtil {

   /** *//**
    * 从一个JSON 对象字符格式中得到一个java对象
    *
    * @param jsonString
    * @param pojoCalss
    * @return
    */
    public static Object getObject4JsonString(String jsonString,Class pojoCalss) {
        Object pojo;
        JSONObject jsonObject = JSONObject.fromObject( jsonString ); 
        pojo = JSONObject.toBean(jsonObject,pojoCalss);
        return pojo;
    }



    /** *//**
    * 从json HASH表达式中获取一个map，改map支持嵌套功能
    *
    * @param jsonString
    * @return
    */
    public static Map getMap4Json(String jsonString) {
        JSONObject jsonObject = JSONObject.fromObject( jsonString ); 
        Iterator  keyIter = jsonObject.keys();
        String key;
        Object value;
        Map valueMap = new HashMap();

        while( keyIter.hasNext())
         {
            key = (String)keyIter.next();
            value = jsonObject.get(key);
            valueMap.put(key, value);
        }

        return valueMap;
    }


    /** *//**
    * 从json数组中得到相应java数组
    *
    * @param jsonString
    * @return
    */
    public static Object[] getObjectArray4Json(String jsonString) {
        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        return jsonArray.toArray();

    }


    /** *//**
    * 从json对象集合表达式中得到一个java对象列表
    *
    * @param jsonString
    * @param pojoClass
    * @return
    */
    public static List getList4Json(String jsonString, Class pojoClass) {

        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        JSONObject jsonObject;
        Object pojoValue;

        List list = new ArrayList();
        for ( int i = 0 ; i
            jsonObject = jsonArray.getJSONObject(i);
            pojoValue = JSONObject.toBean(jsonObject,pojoClass);
            list.add(pojoValue);

        }
        return list;

    }

    /** *//**
    * 从json数组中解析出java字符串数组
    *
    * @param jsonString
    * @return
    */
    public static String[] getStringArray4Json(String jsonString) {

        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        String[] stringArray = new String[jsonArray.size()];
        for( int i = 0 ; i            stringArray[i] = jsonArray.getString(i);

        }

        return stringArray;
    }

    /** *//**
    * 从json数组中解析出javaLong型对象数组
    *
    * @param jsonString
    * @return
    */
    public static Long[] getLongArray4Json(String jsonString){

        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        Long[] longArray = new Long[jsonArray.size()];
        for( int i = 0 ; i            longArray[i] = jsonArray.getLong(i);

        }
        return longArray;
    }

    /** *//**
    * 从json数组中解析出java Integer型对象数组
    *
    * @param jsonString
    * @return
    */
    public static Integer[] getIntegerArray4Json(String jsonString) {

        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        Integer[] integerArray = new Integer[jsonArray.size()];
        for( int i = 0 ; i            integerArray[i] = jsonArray.getInt(i);

        }
        return integerArray;
    }

    /** *//**
    * 从json数组中解析出java Date 型对象数组，使用本方法必须保证
    *
    * @param jsonString
    * @return
    */
//    public static Date[] getDateArray4Json(String jsonString,String DataFormat) {
//       
//        JSONArray jsonArray = JSONArray.fromObject(jsonString);
//        Date[] dateArray = new Date[jsonArray.size()];
//        String dateString;
//        Date date;
//       
//        for( int i = 0 ; i//            dateString = jsonArray.getString(i);
//            date = DateUtil.stringToDate(dateString, DataFormat);
//            dateArray[i] = date;
//           
//        }
//        return dateArray;
//    }

    /** *//**
    * 从json数组中解析出java Integer型对象数组
    *
    * @param jsonString
    * @return
    */
//    public static Double[] getDoubleArray4Json(String jsonString) {
//       
//        JSONArray jsonArray = JSONArray.fromObject(jsonString);
//        Double[] doubleArray = new Double[jsonArray.size()];
//        for( int i = 0 ; i//            doubleArray[i] = jsonArray.getDouble(i);
//           
//        }
//        return doubleArray;
//    }


    /** *//**
    * 将java对象转换成json字符串
    *
    * @param javaObj
    * @return
    */
    public static String getJsonString4JavaPOJO(Object javaObj) {

        JSONObject json;
        json = JSONObject.fromObject(javaObj);
        return json.toString();

    }




    /** *//**
    * 将java对象转换成json字符串,并设定日期格式
    *
    * @param javaObj
    * @param dataFormat
    * @return
    */
//    public static String getJsonString4JavaPOJO(Object javaObj , String dataFormat) {
//       
//        JSONObject json;
//        JsonConfig jsonConfig = new JsonConfig(dataFormat);
//        json = JSONObject.fromObject(javaObj,jsonConfig);
//        return json.toString();
//       
//       
//    }
}

删除的servlet:

package ext.servlet;

import java.io.IOException;

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

import ext.bo.UserBo;

public class Del extends HttpServlet {

 /**
  * The doGet method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to get.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  doPost(request, response);
 }

 /**
  * The doPost method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to post.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  request.setCharacterEncoding("UTF-8");
  response.setCharacterEncoding("UTF-8");

  String jsonData = request.getParameter("data");

  UserBo uBo = new UserBo();

  uBo.delUser(jsonData);

  response.getWriter().print("删除成功!");
 }

}

查询班级的serlvet:

package ext.servlet;

import java.io.IOException;

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

import ext.bo.UserBo;

public class GetCls extends HttpServlet {

 /**
  * The doGet method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to get.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  doPost(request, response);
 }

 /**
  * The doPost method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to post.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  request.setCharacterEncoding("utf-8");

  response.setCharacterEncoding("utf-8");

  UserBo uBo = new UserBo();

  String jsonData = uBo.getClsJsonData();

  response.getWriter().write(jsonData);

  response.getWriter().flush();
 }

}

查询用户的servlet:

package ext.servlet;

import java.io.IOException;

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

import ext.bo.UserBo;

public class Query extends HttpServlet {

 /**
  * The doGet method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to get.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  doPost(request, response);
 }

 /**
  * The doPost method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to post.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  request.setCharacterEncoding("utf-8");

  response.setCharacterEncoding("utf-8");

  String start = request.getParameter("start");

  String limit = request.getParameter("limit");

  UserBo uBo = new UserBo();

  String json = uBo.getJsonData(Integer.parseInt(start), Integer.parseInt(limit));

  response.getWriter().write(json);

  response.getWriter().flush();
 }

}

保存用户servlet:

package ext.servlet;

import java.io.IOException;

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

import ext.bo.UserBo;

public class Save extends HttpServlet {

 /**
  * The doGet method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to get.
  *
  * @param request
  *            the request send by the client to the server
  * @param response
  *            the response send by the server to the client
  * @throws ServletException
  *             if an error occurred
  * @throws IOException
  *             if an error occurred
  */
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  doPost(request, response);
 }

 /**
  * The doPost method of the servlet. 

  *
  * This method is called when a form has its tag value method equals to
  * post.
  *
  * @param request
  *            the request send by the client to the server
  * @param response
  *            the response send by the server to the client
  * @throws ServletException
  *             if an error occurred
  * @throws IOException
  *             if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  request.setCharacterEncoding("UTF-8");
  response.setCharacterEncoding("UTF-8");

  String data = request.getParameter("data");

  UserBo uBo = new UserBo();

  uBo.saveOrUpdate(data);

  response.getWriter().print("保存或修改成功!");
 }

}

相关的数据库的创建:

创建数据表:

/*==============================================================*/
/* DBMS name: MySQL 5.0 */
/* Created on: 2009-7-13 19:08:37 */
/*==============================================================*/


drop table if exists class;

drop table if exists student;

/*==============================================================*/
/* Table: class */
/*==============================================================*/
create table class
(
cls_id int not null auto_increment,
cls_name varchar(20),
cls_cdate varchar(10),
primary key (cls_id)
);

/*==============================================================*/
/* Table: student */
/*==============================================================*/
create table student
(
stu_id int not null auto_increment,
cls_id int,
stu_name varchar(20),
stu_sex int,
stu_age int,
stu_addr text,
stu_tel varchar(20),
primary key (stu_id)
);

alter table student add constraint FK_Relationship_1 foreign key (cls_id)
references class (cls_id) on delete restrict on update restrict;




添加数据表:

insert into class values(null,'A班','2007-12-01');
insert into class values(null,'A班','2007-12-01');

insert into student values(null,1,'学生A',1,20,'福州','1111111');
insert into student values(null,2,'学生B',0,21,'福州','2222222');
insert into student values(null,1,'学生C',1,22,'福州','3333333');
insert into student values(null,2,'学生D',0,23,'福州','4444444');
insert into student values(null,1,'学生E',1,24,'福州','5555555');
insert into student values(null,2,'学生F',0,25,'福州','6666666');
insert into student values(null,1,'学生G',0,26,'福州','7777777');
insert into student values(null,2,'学生H',0,27,'福州','55055342555');
insert into student values(null,1,'学生I',0,18,'福州','55055333555');
insert into student values(null,1,'学生J',0,19,'福州','55055222555');
insert into student values(null,2,'学生K',0,19,'福州','55005551155');
insert into student values(null,2,'学生L',0,20,'福州','5055555555');
insert into student values(null,2,'学生M',1,21,'福州','5500055500055');
insert into student values(null,2,'学生N',1,23,'福州','55555523445');
insert into student values(null,2,'学生O',1,24,'福州','55530455555');
insert into student values(null,1,'学生P',1,25,'福州','55212055555');
insert into student values(null,1,'学生Q',1,24,'福州','5554450555');
insert into student values(null,1,'学生R',1,23,'福州','11111110');
insert into student values(null,2,'学生S',0,21,'福州','2222222');
insert into student values(null,1,'学生T',1,20,'福州','3333333');
insert into student values(null,1,'学生U',0,23,'福州','44444345404');
insert into student values(null,1,'学生V',1,24,'福州','5555555');
insert into student values(null,1,'学生W',1,19,'福州','5555565755');
insert into student values(null,1,'学生X',1,24,'福州','555553255');
insert into student values(null,2,'学生Y',1,22,'福州','555555634555');
insert into student values(null,2,'学生Z',1,22,'福州','5555522255');
insert into student values(null,2,'学生AA',1,18,'福州','55552342555');
insert into student values(null,1,'学生BB',1,17,'福州','5555523455');
insert into student values(null,1,'学生CC',0,24,'福州','5859404');
insert into student values(null,1,'学生DD',0,16,'福州','5553493');
insert into student values(null,1,'学生EE',0,16,'福州','5555555');
insert into student values(null,2,'学生FF',0,18,'福州','5553453');
insert into student values(null,2,'学生GG',1,17,'福州','5555533455');
insert into student values(null,1,'学生HH',1,18,'福州','5555234555');