Ext与后台数据库交互

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EXT Servlet json SQL Server SQL

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 "<span style='color:blue'>先生</span>";
} else {

   return "<span style='color:orange'>女士</span>";
  }
}

    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() {

                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"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

    <title>ExtJsDemo</title>

<link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css">

<script type="text/javascript" src="ext/adapter/ext/ext-base.js"></script>

<script type="text/javascript" src="ext/ext-all-debug.js"></script>

<script type="text/javascript" src="ext/ext-fun.js"></script>

<script type="text/javascript" src="ext/PagingMemoryProxy.js"></script>

<script type="text/javascript" src="js/user.js"></script>

</head>

<body>
<div id="grid"></div>
</body>
</html>

配置下web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
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">
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>Query</servlet-name>
    <servlet-class>ext.servlet.Query</servlet-class>
</servlet>
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>Save</servlet-name>
    <servlet-class>ext.servlet.Save</servlet-class>
</servlet>
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>Del</servlet-name>
    <servlet-class>ext.servlet.Del</servlet-class>
</servlet>
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>GetCls</servlet-name>
    <servlet-class>ext.servlet.GetCls</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>Query</servlet-name>
    <url-pattern>/servlet/Query</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Save</servlet-name>
    <url-pattern>/servlet/Save</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Del</servlet-name>
    <url-pattern>/servlet/Del</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>GetCls</servlet-name>
    <url-pattern>/servlet/GetCls</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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<User>
* @throws SQLException
*/
public List<User> 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<User> list = new ArrayList<User>();

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<Clasz> getClassList() {

List<Clasz> list = new ArrayList<Clasz>();

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<User> 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<User> 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<User> getUserFromJson(String jsonData) {

List<User> list = new ArrayList<User>();

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<User> 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<Clasz> 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<jsonArray.size(); 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<jsonArray.size() ; 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<jsonArray.size() ; 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<jsonArray.size() ; 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<jsonArray.size() ; 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<jsonArray.size() ; 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. <br>
*
* 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. <br>
*
* 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 {

doPost(request, response);
}

  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 {

doPost(request, response);
}

  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. <br>
*
* 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. <br>
*
* 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!");
}

}

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