ssm框架搭建+easyui增删改查实现

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- Spring配置文件 -->
  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  
  <!-- 编码过滤器 -->
  <filter>
      <filter-name>encodingFilter</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <async-supported>true</async-supported>
      <init-param>
          <param-name>encoding</param-name>
          <param-value>UTF-8</param-value>
      </init-param>
  </filter>
  <filter-mapping>
      <filter-name>encodingFilter</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <!-- 配置Spring监听器 -->
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- 添加对SpringMVC的支持 -->
  <servlet>
      <servlet-name>SpringMVC</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:spring-mvc.xml</param-value>
      </init-param>
  </servlet>
  <servlet-mapping>
      <servlet-name>SpringMVC</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>

log4j.rootLogger=DEBUG, Console  
  
#Console  
log4j.appender.Console=org.apache.log4j.ConsoleAppender  
log4j.appender.Console.layout=org.apache.log4j.PatternLayout  
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n  
  
log4j.logger.java.sql.ResultSet=INFO  
log4j.logger.org.apache=INFO  
log4j.logger.java.sql.Connection=DEBUG  
log4j.logger.java.sql.Statement=DEBUG  
log4j.logger.java.sql.PreparedStatement=DEBUG  

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!-- 别名 -->
    <typeAliases>
        <package name="com.java.entity" />    <!-- 后面书写类全名时默认加该包名前缀如：<resultMap type="User"... -->
    </typeAliases>

</configuration>

<?xml version="1.0" encoding="UTF-8"?>    
<beans xmlns="http://www.springframework.org/schema/beans"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
    
    <!-- 使用注解的包，包括子集 -->
    <context:component-scan base-package="com.java.controller"></context:component-scan>
    
    <!-- 视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>  

<?xml version="1.0" encoding="UTF-8"?>    
<beans xmlns="http://www.springframework.org/schema/beans"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
        
    <!-- 自动扫描该包下面的bean文件 -->
    <context:component-scan base-package="com.java.service"></context:component-scan>
    
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!-- <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/> -->
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/crm"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>
    
    <!-- 配置MyBatis的sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>        
        <property name="mapperLocations" value="classpath:com/java/mappers/*.xml"></property>
    </bean>
    
    <!-- Mapper接口所在包名，Spring会自动查找其下的Mapper  -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.java.dao"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>
    
    <!-- 配置transactionManager事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- 配置事物通知属性 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!-- 定义事物传播特性 -->
        <tx:attributes>
            <tx:method name="insert" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="edit*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="add*" propagation="REQUIRED" />  
            <tx:method name="new*" propagation="REQUIRED" />  
            <tx:method name="set*" propagation="REQUIRED" />  
            <tx:method name="remove*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
            <tx:method name="change*" propagation="REQUIRED" />  
            <tx:method name="check*" propagation="REQUIRED" />  
            <tx:method name="get*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="find*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="load*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="*" propagation="REQUIRED" read-only="true" />  
        </tx:attributes>
    </tx:advice>
    
    <!-- 配置事物切面 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.java.service.*.*(..))" id="serviceOperation"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation"/>
    </aop:config>
    
</beans>

<%@ 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="<%=basePath%>">

<title>My JSP ‘userManage.jsp‘ starting page</title>
<link rel="stylesheet" type="text/css"
    href="${pageContext.request.contextPath}/jquery-easyui-1.3.3/themes/default/easyui.css">
<link rel="stylesheet" type="text/css"
    href="${pageContext.request.contextPath}/jquery-easyui-1.3.3/themes/icon.css">
<script type="text/javascript"
    src="${pageContext.request.contextPath}/jquery-easyui-1.3.3/jquery.min.js"></script>
<script type="text/javascript"
    src="${pageContext.request.contextPath}/jquery-easyui-1.3.3/jquery.easyui.min.js"></script>
<script type="text/javascript"
    src="${pageContext.request.contextPath}/jquery-easyui-1.3.3/locale/easyui-lang-zh_CN.js"></script>

<script type="text/javascript">
    var url;
    function searchUser() {
        $("#dg").datagrid(‘load‘, {
            "userName" : $("#s_userName").val()
        });
    }
    function openUserAddDialog() {
        $("#dlg").dialog("open").dialog("setTitle", "添加用户信息");
        url = "${pageContext.request.contextPath}/user/save.do";
    }

    function openUserModifyDialog() {
        var selectedRows = $("#dg").datagrid("getSelections");
        if (selectedRows.length != 1) {
            $.messager.alert("系统提示", "请选择一条要编辑的数据！");
            return;
        }
        var row = selectedRows[0];
        $("#dlg").dialog("open").dialog("setTitle", "编辑用户信息");
        $("#fm").form("load", row);
        url = "${pageContext.request.contextPath}/user/save.do?id=" + row.id;
    }
    
    function saveUser() {
        $("#fm").form("submit", {
            url : url,
            onSubmit : function() {
                if ($("#roleName").combobox("getValue") == "") {
                    $.messager.alert("系统提示", "请选择用户角色！");
                    return false;
                }
                return $(this).form("validate");
            },
            success : function(result) {
                var result = eval(‘(‘ + result + ‘)‘);
                if (result.success) {
                    $.messager.alert("系统提示", "保存成功！");
                    resetValue();
                    $("#dlg").dialog("close");
                    $("#dg").datagrid("reload");
                } else {
                    $.messager.alert("系统提示", "保存失败！");
                    return;
                }
            }
        });
    }

    function resetValue() {
        $("#userName").val("");
        $("#password").val("");
        $("#trueName").val("");
        $("#email").val("");
        $("#phone").val("");
        $("#roleName").combobox("setValue", "");
    }

    function closeUserDialog() {
        $("#dlg").dialog("close");
        resetValue();
    }

    function deleteUser() {
        var selectedRows = $("#dg").datagrid("getSelections");
        if (selectedRows.length == 0) {
            $.messager.alert("系统提示", "请选择要删除的数据！");
            return;
        }
        var strIds = [];
        for ( var i = 0; i < selectedRows.length; i++) {
            strIds.push(selectedRows[i].id);
        }
        var ids = strIds.join(",");
        $.messager.confirm("系统提示", "您确定要删除这<font color=red>"
                + selectedRows.length + "</font>条数据吗？", function(r) {
            if (r) {
                $.post("${pageContext.request.contextPath}/user/delete.do", {
                    ids : ids
                }, function(result) {
                    if (result.success) {
                        $.messager.alert("系统提示", "数据已成功删除！");
                        $("#dg").datagrid("reload");
                    } else {
                        $.messager.alert("系统提示", "数据删除失败，请联系系统管理员！");
                    }
                }, "json");
            }
        });
    }
</script>
</head>

<body style="margin: 1px">

    <table id="dg" title="用户管理" class="easyui-datagrid" fitColumns="true"
        pagination="true" rownumbers="true"
        url="${pageContext.request.contextPath}/user/list.do" fit="true"
        toolbar="#tb">
        <thead>
            <tr>
                <th field="cb" checkbox="true" align="center"></th>
                <th field="id" width="50" align="center">编号</th>
                <th field="userName" width="50" align="center">用户名</th>
                <th field="password" width="50" align="center">密码</th>
                <th field="trueName" width="50" align="center">真实姓名</th>
                <th field="email" width="50" align="center">邮件</th>
                <th field="phone" width="50" align="center">联系电话</th>
                <th field="roleName" width="50" align="center">角色</th>
            </tr>
        </thead>
    </table>
    <div id="tb">
        <a href="javascript:openUserAddDialog()" class="easyui-linkbutton"
            iconCls="icon-add" plain="true">添加</a> <a
            href="javascript:openUserModifyDialog()" class="easyui-linkbutton"
            iconCls="icon-edit" plain="true">修改</a> <a
            href="javascript:deleteUser()" class="easyui-linkbutton"
            iconCls="icon-remove" plain="true">删除</a>
        <div>
            &nbsp;用户名：&nbsp;<input type="text" id="s_userName" size="20"
                onkeydown="if(event.keyCode == 13)searchUser()" /> <a
                href="javascript:searchUser()" class="easyui-linkbutton"
                iconCls="icon-search" plain="true">查询</a>
        </div>

        <div id="dlg-buttons">
            <a href="javascript:saveUser()" class="easyui-linkbutton"
                iconCls="icon-ok">保存</a> <a href="javascript:closeUserDialog()"
                class="easyui-linkbutton" iconCls="icon-cancel">关闭</a>
        </div>

        <div id="dlg" class="easyui-dialog"
            style="width: 730px;height:280px;padding:10px 10px;" closed="true"
            buttons="#dlg-buttons">
            <form method="post" id="fm">
                <table cellspacing="8px;">
                    <tr>
                        <td>用户名：</td>
                        <td><input type="text" id="userName" name="userName"
                            class="easyui-validatebox" required="true" />&nbsp;<span
                            style="color: red">*</span>
                        </td>
                        <td>&nbsp;&nbsp;&nbsp;&nbsp;</td>
                        <td>密码：</td>
                        <td><input type="password" id="password" name="password"
                            class="easyui-validatebox" required="true" />&nbsp;<span
                            style="color: red">*</span>
                        </td>
                    </tr>
                    <tr>
                        <td>真实姓名：</td>
                        <td><input type="text" id="trueName" name="trueName"
                            class="easyui-validatebox" required="true" />&nbsp;<span
                            style="color: red">*</span>
                        </td>
                        <td>&nbsp;&nbsp;&nbsp;&nbsp;</td>
                        <td>邮箱：</td>
                        <td><input type="text" id="email" name="email"
                            validType="email" class="easyui-validatebox" required="true" />&nbsp;<span
                            style="color: red">*</span>
                        </td>
                    </tr>
                    <tr>
                        <td>联系电话：</td>
                        <td><input type="text" id="phone" name="phone"
                            class="easyui-validatebox" required="true" />&nbsp;<span
                            style="color: red">*</span>
                        </td>
                        <td>&nbsp;&nbsp;&nbsp;&nbsp;</td>
                        <td>用户角色：</td>
                        <td><select name="roleName" class="easyui-combobox"
                            id="roleName" style="width: 154px;" editable="false"
                            panelHeight="auto">
                                <option value="">请选择角色</option>
                                <option value="系统管理员">系统管理员</option>
                                <option value="销售主管">销售主管</option>
                                <option value="客户经理">客户经理</option>
                                <option value="高管">高管</option>
                        </select> &nbsp;<span style="color: red">*</span>
                        </td>
                    </tr>
                </table>
            </form>
        </div>
</body>
</html>

package com.java.controller;

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

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.java.entity.PageBean;
import com.java.entity.User;
import com.java.service.UserService;
import com.java.util.ResponseUtil;
import com.java.util.StringUtil;
import com.sun.mail.iap.Response;

/**
 * 用户Controller层
 * @author Administrator
 *
 */
@Controller
@RequestMapping("/user")
public class UserController {
    
    @Resource
    private UserService userService;
    
    /**
     * 删除用户
     * @param ids
     * @param res
     * @return
     * @throws Exception
     */
    @RequestMapping("/delete")
    public String delete(@RequestParam(value="ids") String ids,HttpServletResponse res) throws Exception{
        String[] idStr = ids.split(",");
        JSONObject jsonObject = new JSONObject();
        for (String id : idStr) {
            userService.delete(Integer.parseInt(id));
        }
        jsonObject.put("success", true);
        ResponseUtil.write(res, jsonObject);
        return null;
    }
    
    /**
     * 添加或者修改
     * @param user
     * @param res
     * @return
     * @throws Exception
     */
    @RequestMapping("/save")
    public String save(User user,HttpServletResponse res) throws Exception{
        //操作记录条数，初始化为0
        int resultTotal = 0;
        if (user.getId() == null) {
            resultTotal = userService.add(user);
        }else{
            resultTotal = userService.update(user);
        }
        JSONObject jsonObject = new JSONObject();
        if(resultTotal > 0){   //说明修改或添加成功
            jsonObject.put("success", true);
        }else{
            jsonObject.put("success", false);
        }
        ResponseUtil.write(res, jsonObject);
        return null;
    }
    
    /**
     * 用户登录
     * @param user
     * @param request
     * @return
     * @throws Exception
     */
    @RequestMapping("/login")
    public String login(User user, HttpServletRequest request) throws Exception{
        User resultUser = userService.login(user);
        if (resultUser == null) {
            request.setAttribute("user", resultUser);
            request.setAttribute("errorMsg", "用户名或密码错误");
            return "login";
        }else {
            HttpSession session = request.getSession();
            session.setAttribute("currentUser", resultUser);
            return "redirect:/main.jsp";
        }
    }
    
    /**
     * 用户分页查询
     * @param page
     * @param rows
     * @param s_user
     * @param res
     * @return
     * @throws Exception
     */
    @RequestMapping("/list")
    public String list(@RequestParam(value="page",required=false) String page,@RequestParam(value="rows",required=false) String rows,User s_user,HttpServletResponse res) throws Exception{
        PageBean pageBean=new PageBean(Integer.parseInt(page),Integer.parseInt(rows));
        Map<String,Object> map=new HashMap<String,Object>();
        map.put("userName", StringUtil.formatLike(s_user.getUserName()));
        map.put("start", pageBean.getStart());
        map.put("size", pageBean.getPageSize());
        List<User> userList=userService.find(map);
        Long total=userService.getTotal(map);
        JSONObject result=new JSONObject();
        JSONArray jsonArray=JSONArray.fromObject(userList);
        result.put("rows", jsonArray);
        result.put("total", total);
        ResponseUtil.write(res, result);
        return null;
    }
    
}

package com.java.dao;

import java.util.List;
import java.util.Map;

import com.java.entity.User;

/**
 * 用户DAO接口
 * 
 * @author Administrator
 * 
 */
public interface UserDao {
    
    /**
     * 用户登录
     * @param user
     * @return
     */
    public User login(User user);
    
    /**
     * 用户查询
     * @param map
     * @return用户集合
     */
    public List<User> find(Map<String, Object> map);
    
    /**
     * 获取总记录数
     * @param map
     * @return获取的total数
     */
    public Long getTotal(Map<String, Object> map);
    
    /**
     * 修改用户
     * @param user
     * @return影响的记录数
     */
    public int update(User user);
    
    /**
     * 添加用户
     * @param user
     * @return影响的记录数
     */
    public int add(User user);
    
    /**
     * 删除用户
     * @param id
     * @return
     */
    public int delete(Integer id);
    
    
}

package com.java.entity;

/**
 * 分页Model类
 * @author 
 *
 */
public class PageBean {

    private int page; // 第几页
    private int pageSize; // 每页记录数
    private int start;  // 起始页
    
    public PageBean(int page, int pageSize) {
        super();
        this.page = page;
        this.pageSize = pageSize;
    }
    
    public int getPage() {
        return page;
    }
    public void setPage(int page) {
        this.page = page;
    }
    
    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getStart() {
        return (page-1)*pageSize;
    }
    
    
}

package com.java.entity;

/**
 * 用户实体
 * @author Administrator
 *
 */
public class User {
    private Integer id;
    private String userName;
    private String password;
    private String trueName;
    private String email;
    private String phone;
    private String roleName;    //角色名称：系统管理员、销售主管、客户经理、高管
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getTrueName() {
        return trueName;
    }
    public void setTrueName(String trueName) {
        this.trueName = trueName;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getRoleName() {
        return roleName;
    }
    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }
    
}

package com.java.service;

import java.util.List;
import java.util.Map;

import com.java.entity.User;

/**
 * UserService接口
 * @author Administrator
 *
 */
public interface UserService {
    
    /**
     * 用户登录
     * @param user
     * @return
     */
    public User login(User user);
    /**
     * 用户查询
     * @param map
     * @return
     */
    public List<User> find(Map<String, Object> map);
    
    /**
     * 获取总记录数
     * @param map
     * @return
     */
    public Long getTotal(Map<String, Object> map);
    
    /**
     * 修改用户
     * @param user
     * @return影响的记录数
     */
    public int update(User user);
    
    /**
     * 添加用户
     * @param user
     * @return影响的记录数
     */
    public int add(User user);
    
    /**
     * 删除用户
     * @param id
     * @return
     */
    public int delete(Integer id);
}

package com.java.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.java.dao.UserDao;
import com.java.entity.User;
import com.java.service.UserService;

/**
 * UserService实现类
 * @author Administrator
 *
 */
@Service("userService")
public class UserServiceImpl implements UserService{
    
    @Resource
    private UserDao userDao;
    
    @Override
    public User login(User user) {
        return userDao.login(user);
    }
    
    @Override
    public List<User> find(Map<String, Object> map) {
        return userDao.find(map);
    }
    
    @Override
    public Long getTotal(Map<String, Object> map) {
        return userDao.getTotal(map);
    }

    @Override
    public int update(User user) {
        return userDao.update(user);
    }

    @Override
    public int add(User user) {
        return userDao.add(user);
    }

    @Override
    public int delete(Integer id) {
        return userDao.delete(id);
    }
}

package com.java.util;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;


public class ResponseUtil {

    public static void write(HttpServletResponse response,Object object)throws Exception{
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out=response.getWriter();
        out.println(object);
        out.flush();
        out.close();
    }
}

package com.java.util;

/**
 * 字符串工具类
 * @author 
 *
 */
public class StringUtil {

    /**
     * 判断是否是空
     * @param str
     * @return
     */
    public static boolean isEmpty(String str){
        if(str==null||"".equals(str.trim())){
            return true;
        }else{
            return false;
        }
    }
    
    /**
     * 判断是否不是空
     * @param str
     * @return
     */
    public static boolean isNotEmpty(String str){
        if((str!=null)&&!"".equals(str.trim())){
            return true;
        }else{
            return false;
        }
    }
    
    /**
     * 格式化模糊查询
     * @param str
     * @return
     */
    public static String formatLike(String str){
        if(isNotEmpty(str)){
            return "%"+str+"%";
        }else{
            return null;
        }
    }
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.java.dao.UserDao">
    
    <!-- 先定义一个Interface，UserMapper，然后Mapper文件的namespace指向的就是这个Interface， UserInterface里定义的方法和UserMapper.xml文件中的一样, 
        然后代码里直接使用接口 -->
        
    <resultMap type="User" id="UserResult">
        <result property="id" column="id" />
        <result property="userName" column="userName" />
        <result property="password" column="password" />
        <result property="trueName" column="trueName" />
        <result property="email" column="email" />
        <result property="phone" column="phone" />
        <result property="roleName" column="roleName" />
    </resultMap>
    
    <!-- 所谓的动态SQL语句 -->
    <select id="login" parameterType="User" resultMap="UserResult">
        select * from userInfo where userName = #{userName} and password = #{password} and roleName = #{roleName}
    </select>
    
    <!-- 用户查询 -->
    <select id="find" parameterType="Map" resultMap="UserResult">
        select * from userInfo
        <where>
            <if test="userName!=null and userName!=‘‘ ">
                and userName like #{userName}
            </if>
        </where>
        <if test="start!=null and size!=null">
            limit #{start},#{size}
        </if>
    </select>
    <select id="getTotal" parameterType="Map" resultType="Long">
        select count(*) from userInfo
        <where>
            <if test="userName!=null and userName!=‘‘ ">
                and userName like #{userName}
            </if>
        </where>
    </select>
    
    <!-- 用户添加 -->
    <insert id="add" parameterType="User">
        insert into userInfo values(null,#{userName},#{password},#{trueName},#{email},#{phone},#{roleName})
    </insert>
    
    <!-- 用户修改 -->
    <update id="update" parameterType="User">
        update userInfo
        <set>
            <if test="userName != null and userName != ‘‘">userName = #{userName},</if>
            <if test="password != null and password != ‘‘">password = #{password},</if>
            <if test="trueName != null and trueName != ‘‘">trueName = #{trueName},</if>
            <if test="email != null and email != ‘‘">email = #{email},</if>
            <if test="phone != null and phone != ‘‘">phone = #{phone},</if>
            <if test="roleName != null and roleName != ‘‘">roleName = #{roleName},</if>
        </set>
        where id = #{id}
    </update>
    
    <!-- 用户删除 -->
    <delete id="delete" parameterType="Integer">
        delete from userInfo where id = #{id}
    </delete>
</mapper>