SpringMVC（一）

第一节：SpringMVC简介
SpringMVC 是一套功能强大，性能强悍，使用方便的优秀的 MVC 框架；

在web.xml中配置拦截所有的请求，使用org.springframework.web.servlet.DispatcherServlet转发请求。

spring-mvc.xml 配置视图解析。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>SpringMvc01</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

    <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>

web.xml

<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 使用注解的包，包括子集 ，自动扫描生成bean-->
    <context:component-scan base-package="com.java1234"/>

    <!-- 视图解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

spring-mvc.xml

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloWorldController {

    @RequestMapping("/helloWorld")
    public String helloWorld(Model model){
        model.addAttribute("message", "StringMvc大爷你好！");
        return "helloWorld";
    }
}

controller

第二章 SpringMVC控制器

第一节：@RequestMapping 请求映射
第二节：@RequestParam请求参数（默认是true, 如果没有参数就会报错，可以设置成 RequestParam(value="id",required=false)）
第三节：ModelAndView返回模型和视图

web.xml and spring-mvc.xml 同上。

@Controller
@RequestMapping("/student")
public class StudentController {

    private static List<Student> studentList=new ArrayList<Student>();
    
    static{
        studentList.add(new Student(1,"张三",11));
        studentList.add(new Student(2,"李四",12));
        studentList.add(new Student(3,"王五",13));
    }
    
    @RequestMapping("/list")
    public ModelAndView list(){
        ModelAndView mav=new ModelAndView();
        mav.addObject("studentList", studentList);
        mav.setViewName("student/list");
        return mav;
    }
    
    @RequestMapping("/preSave")
    public ModelAndView preSave(@RequestParam(value="id",required=false) String id){
        ModelAndView mav=new ModelAndView();
        if(id!=null){
            mav.addObject("student", studentList.get(Integer.parseInt(id)-1));
            mav.setViewName("student/update");
        }else{
            mav.setViewName("student/add");            
        }
        return mav;
    }
}

View Code

===================list.jsp==============
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/student/preSave.do">添加学生</a>
<table>
    <tr>
        <th>编号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>操作</th>    
    </tr>
    <c:forEach var="student" items="${studentList }">
    <tr>
        <td>${student.id }</td>
        <td>${student.name }</td>
        <td>${student.age }</td>
        <td><a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a></td>
    </tr>
    </c:forEach>
</table>

</body>
</html>

=============add.jsp============================
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="student/save.do" method="post">
<table>
    <tr>
        <th colspan="2">学生添加</th>
    </tr>
    <tr>
        <td>姓名</td>
        <td><input type="text" name="name"/></td>
    </tr>
    <tr>
        <td>年龄</td>
        <td><input type="text" name="age"/></td>
    </tr>
    <tr>
        <td colspan="2">
            <input type="submit" value="提交"/>
        </td>
    </tr>
</table>
</form>
</body>
</html>
=============update.jsp=====================
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="student/save.do" method="post">
<table>
    <tr>
        <th colspan="2">学生修改</th>
    </tr>
    <tr>
        <td>姓名</td>
        <td><input type="text" name="name" value="${student.name }"/></td>
    </tr>
    <tr>
        <td>年龄</td>
        <td><input type="text" name="age" value="${student.age }"/></td>
    </tr>
    <tr>
        <td colspan="2">
            <input type="hidden" name="id" value="${student.id }"/>
            <input type="submit" value="提交"/>
        </td>
    </tr>
</table>
</form>
</body>
</html>
=============index.jsp=====================
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<% response.sendRedirect("student/list.do"); %>

View Code

第四节：SpringMVC 对象属性自动封装（表单中的name值和对象的属性一样就会自动封装）
第五节：SpringMVC POST请求乱码解决（使用编码过滤器org.springframework.web.filter.CharacterEncodingFilter对所以的请求）
第六节：Controller内部转发和重定向

请求路径建议使用绝对地址：${pageContext.request.contextPath}/....

重定向： return "redirect:/student/list.do"

转发： return "forward:/student/list.do";（转发可以带数据）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>SpringMvc01</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <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>
    
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>*.do</url-pattern>
    </filter-mapping>
</web-app>

View Code

@RequestMapping("/save")
    public String save(Student student){
        if(student.getId()!=0){
            Student s=studentList.get(student.getId()-1);
            s.setName(student.getName());
            s.setAge(student.getAge());
        }else{
            studentList.add(student);            
        }
         return "redirect:/student/list.do";
        // return "forward:/student/list.do";   
    }
    
    @RequestMapping("/delete")
    public String delete(@RequestParam("id") int id){
        studentList.remove(id-1);
        return "redirect:/student/list.do";
    }

View Code

第七节：SpringMvc对Servlet API 的支持

HttpServletRequest ,HttpServletResponse ,HttpSession
第八节：SpringMvc对Json的支持

<mvc:annotation-driven/>
添加命名空间：xmlns:mvc="http://www.springframework.org/schema/mvc"   及其地址： http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd 及jason.jar包

@ResponseBody 这个注解是把对象转换成jason格式。（建议用原生的ResponseUtil.write(HttpServletResponse response,Object o)）

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/login")
    public String login(HttpServletRequest request,HttpServletResponse response){
        System.out.println("----登录验证---");
        String userName=request.getParameter("userName");
        String password=request.getParameter("password");
        Cookie cookie=new Cookie("user",userName+"-"+password);
        cookie.setMaxAge(1*60*60*24*7);
        User currentUser=new User(userName,password);
        response.addCookie(cookie);
        HttpSession session=request.getSession();
        session.setAttribute("currentUser", currentUser);
        return "redirect:/main.jsp";
    }
    
    @RequestMapping("/login2")
    public String login2(HttpServletRequest request){
        return "redirect:/main.jsp";
    }
    
    @RequestMapping("/login3")
    public String login3(HttpSession session){
        return "redirect:/main.jsp";
    }
    
    @RequestMapping("/ajax")
    public @ResponseBody User ajax(){
        User user=new User("zhangsan","123");
        return user;
    }
}

=====================================
public class ResponseUtil {

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

View Code

<?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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 使用注解的包，包括子集 -->
    <context:component-scan base-package="com.java1234"/>
    
    <!-- 支持对象与json的转换。 -->
    <mvc:annotation-driven/>  

    <!-- 视图解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

View Code

这种比较灵活，使用json-lib jar包把对象转jsonObject 或 list<> 转 jsonArray

    /**
     * 通过任务id获取请假单
     * @param taskId
     * @param response
     * @return
     * @throws Exception
     */
    @RequestMapping("/getLeaveByTaskId")
    public String getLeaveByTaskId(String taskId,HttpServletResponse response)throws Exception{
        //通过taskId 和 流程变量名称找到leaveId 
        Integer leaveId=(Integer) taskService.getVariable(taskId, "leaveId");
        Leave leave=leaveService.findById(leaveId);
        JSONObject result=new JSONObject();
        result.put("leave", JSONObject.fromObject(leave));
        ResponseUtil.write(response, result);
        return null;
    }



    /**
     * 根据条件分页查询请假单集合
     * @param page
     * @param rows
     * @param userId
     * @param response
     * @return
     * @throws Exception
     */
    @RequestMapping("/list")
    public String list(@RequestParam(value="page",required=false)String page,@RequestParam(value="rows",required=false)String rows,String userId,HttpServletResponse response)throws Exception{
        PageBean pageBean=new PageBean(Integer.parseInt(page),Integer.parseInt(rows));
        Map<String,Object> map=new HashMap<String,Object>();
        map.put("userId",userId); // 用户名
        map.put("start", pageBean.getStart());
        map.put("size", pageBean.getPageSize());
        List<Leave> leaveList=leaveService.find(map);
        Long total=leaveService.getTotal(map);
        JsonConfig jsonConfig=new JsonConfig();
        jsonConfig.registerJsonValueProcessor(java.util.Date.class, new DateJsonValueProcessor("yyyy-MM-dd hh:mm:ss"));
        JSONObject result=new JSONObject();
        JSONArray jsonArray=JSONArray.fromObject(leaveList,jsonConfig);
        result.put("rows", jsonArray);
        result.put("total", total);
        ResponseUtil.write(response, result);
        return null;
    }

View Code

$.post("${pageContext.request.contextPath}/leave/getLeaveByTaskId.do",{taskId:'${param.taskId}'},function(result){
            var leave=result.leave;
            $("#leavePerson").val(leave.user.firstName+leave.user.lastName);
            $("#leaveDays").val(leave.leaveDays);
            $("#leaveReason").val(leave.leaveReason);
        },"json");





<table id="dg" title="请假管理" class="easyui-datagrid"
  fitColumns="true" pagination="true" rownumbers="true"
  url="${pageContext.request.contextPath}/leave/list.do" fit="true" toolbar="#tb">
 <thead>
     <tr>
         <th field="cb" checkbox="true" align="center"></th>
         <th field="id" width="30" align="center">编号</th>
         <th field="leaveDate" width="80" align="center">请假日期</th>
         <th field="leaveDays" width="30" align="center">请假天数</th>
         <th field="leaveReason" width="200" align="center">请假原因</th>
         <th field="state" width="30" align="center">审核状态</th>
         <th field="processInstanceId" width="30" hidden="true" align="center">流程实例Id</th>
         <th field="action" width="50" align="center" formatter="formatAction">操作</th>
     </tr>
 </thead>
</table>

View Code

补充：@ModelAttribute

posted @ 2017-04-02 17:39 SKYisLimit 阅读(132) 评论(0) 收藏举报

刷新页面返回顶部

SKYisLimit

SpringMVC（一）

公告