ssm框架搭建+easyui增删改查实现

最新推荐文章于 2023-07-05 17:23:42 发布

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最新推荐文章于 2023-07-05 17:23:42 发布

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本文详细介绍了一个基于MyBatis和Spring的项目实战案例，包括项目结构、配置文件详解、核心代码实现等内容。

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所有jar包打包下载： http://pan.baidu.com/s/1qLEaU

1、项目目录结构

其中，controller包下存放控制层文件，dao下存放各个model类相关的数据库操作接口，entity下放置各种model类，mappers下放置各个dao对应的映射文件，service服务层就不说了，放置各种service接口，impl是其具体实现类。

2、web.xml文件配置

<?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>

3、log4j.properties配置日志

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

4、mybatis-config.xml配置

<?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>

5、spring-mvc.xml配置

<?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>

6、applicationContext.xml配置

<?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>

7、增删改查具体实现

主界面很简单：

详细html实现：

<%@ 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>
       用户名： <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" /> <span
              style="color: red">*</span>
            </td>
            <td>	</td>
            <td>密码：</td>
            <td><input type="password" id="password" name="password"
              class="easyui-validatebox" required="true" /> <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" /> <span
              style="color: red">*</span>
            </td>
            <td>	</td>
            <td>邮箱：</td>
            <td><input type="text" id="email" name="email"
              validType="email" class="easyui-validatebox" required="true" /> <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" /> <span
              style="color: red">*</span>
            </td>
            <td>	</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>  <span style="color: red">*</span>
            </td>
          </tr>
        </table>
      </form>
    </div>
</body>
</html>

再来看看目录结构：

UserController：

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;
  }
}

UserDao：

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);
    
    
}

PageBean，用来分页的一个工具类：

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;
  }
}

User，用户实体类：

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;
  }
}

UserService：

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);
}

UserServiceImpl：

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);
  }
}

ResponseUtil工具类，主要用于返回json数据：

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();
  }
}

StringUtil，字符串工具类：

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;
        }
    }
}

UserMapper.xml，mybatis所谓的动态sql语句，全部封装在这里：

<?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>