SpringMVC进阶

时间：2022-05-28 03:06:25

1.springmvc（注解版本）

注解扫描

<?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: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-3.0.xsd">

    <!--让spring容器去扫描注释-->

    <context:component-scan base-package="com.juaner.app14"/>

    <!--视图解析器-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/jsp/"/>

        <property name="suffix" value=".jsp"/>

    </bean>

</beans>

Action类

@Controller

public class HelloAction {

    public HelloAction(){

        System.out.println(this .hashCode() );

    }

    @RequestMapping(value = "/hello.action")

    public String hello(Model model)throws Exception{

        System.out.println("hello");

        model.addAttribute("message","this is the first....");

        return "success";

    }

    @RequestMapping(value = "/bye.action")

    public String bye(Model model)throws Exception{

        System.out.println("bye");

        model.addAttribute("message","bye");

        return "success";

    }

}

2.一个Action中，写多个类似的业务控制方法

@Controller

@RequestMapping(value="/user")

public class UserAction {

    @RequestMapping(value = "/register")

    public String register(Model model)throws Exception{

        model.addAttribute("message","注册成功");

        return "/jsp/success.jsp";

    }

    @RequestMapping(value = "/login")

    public String login(Model model)throws Exception{

        model.addAttribute("message","登录成功");

        return "/jsp/success.jsp";

    }

}

3.在业务控制方法中写入普通变量收集参数，限定某个业务控制方法，只允许GET或POST请求方式访问

@Controller

@RequestMapping(value="/user")

public class UserAction {

    @RequestMapping(method= RequestMethod.POST,value = "/register")

    public String register(Model model,String username,double salary)throws Exception{

        System.out.println(username+salary);

        model.addAttribute("message","注册成功");

        return "/jsp/success.jsp";

    }

    @RequestMapping(value = "/login", method= {RequestMethod.POST,RequestMethod.GET})

    public String login(Model model,String username,double salary)throws Exception{

        System.out.println(username+salary);

        model.addAttribute("message","登录成功");

        return "/jsp/success.jsp";

    }

}

4.在业务控制方法中写入HttpServletRequest，HttpServletResponse，Model等传统web参数

@Controller

@RequestMapping(value="/user")

public class UserAction {

    @RequestMapping(method= RequestMethod.POST,value = "/register" )

    public void  register(HttpServletRequest request, HttpServletResponse response)throws Exception{

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

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

        System.out.println(username+salary);

        request.setAttribute("message","转发参数");

//        response.sendRedirect(request.getContextPath()+"/jsp/success.jsp");

        request.getRequestDispatcher("/jsp/success.jsp").forward(request,response);

    }

}

5.在业务控制方法中写入模型变量收集参数，且使用@InitBind来解决字符串转日期类型

　　jsp中的元素name属性不用加user.前缀

@Controller

@RequestMapping(value="/user")

public class UserAction {

    @InitBinder

    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {

        //向springmvc中注册一个自定义的类型转换器

        //参数一：将string转成什么类型的字节码

        //参数二：自定义转换规则

        binder.registerCustomEditor(Date.class,

                new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true));

    }

    @RequestMapping(method= RequestMethod.POST,value = "/register" )

    public String   register(User user, Model model)throws Exception{

        System.out.println("用户注册");

        model.addAttribute("user",user);

        System.out.println(new Timestamp(user.getHiredate().getTime()));

        return "/jsp/success.jsp";

    }

}

　　在业务控制方法中写入User，Admin多个模型收集参数，需要更大的模型包装User，Admin

6.在业务控制方法中收集数组参数

@Controller

@RequestMapping(value = "/emp")

public class EmpAction {

    @RequestMapping(value = "/deleteAll",method = RequestMethod.POST)

    public String deleteAll(Model model,int[] id)throws Exception{

        for(int i:id)

        {

            System.out.println(i);

        }

        model.addAttribute("message","批量删除员工成功");

        return "/jsp/success.jsp";

    }

}

jsp

<form action="${pageContext.request.contextPath}/emp/deleteAll.action" method="post">

    <table>

        <tr><th>

            编号

        </th><th>

            姓名

        </th></tr>

        <tr>

            <td>

                <input type="checkbox" name="id" value="1123">

            </td>

            <td>哈哈</td>

        </tr>

        <tr>

            <td>

                <input type="checkbox" name="id" value="2123">

            </td>

            <td>嘻嘻</td>

        </tr>

        <tr>

            <td>

                <input type="checkbox" name="id" value="3">

            </td>

            <td>呵呵</td>

        </tr>

        <tr>

            <td colspan="2">

                <input type="submit" value="提交">

            </td>

        </tr>

    </table>

</form>

7.在业务控制方法中收集List<JavaBean>参数

bean

public class Bean {

    private List<Emp> empList = new ArrayList<Emp>();

    public  Bean(){}

    public List<Emp> getEmpList() {

        return empList;

    }

    public void setEmpList(List<Emp> empList) {

        this.empList = empList;

    }

}

action

@Controller

@RequestMapping(value = "/emp")

public class EmpAction {

    @RequestMapping(value = "/addAll",method = RequestMethod.POST)

    public String addAll(Model model,Bean bean)throws Exception{

        for(Emp emp:bean.getEmpList())

        {

            System.out.println(emp);

        }

        model.addAttribute("message","批量添加员工成功");

        return "/jsp/success.jsp";

    }

}

jsp

<form action="${pageContext.request.contextPath}/emp/addAll.action" method="post">

    <table>

        <tr>

            <td><input name="empList[0].username" type="text" value="哈哈"></td>

            <td><input name="empList[0].salary" type="text" value="6000"></td>

        </tr>

        <tr>

            <td><input name="empList[1].username" type="text" value="呵呵"></td>

            <td><input name="empList[1].salary" type="text" value="7000"></td>

        </tr>

        <tr>

            <td><input name="empList[2].username" type="text" value="嘻嘻"></td>

            <td><input name="empList[2].salary" type="text" value="8000"></td>

        </tr>

        <tr>

            <td colspan="2" align="center"><input  type="submit" value="注册"></td>

        </tr>

    </table>

</form>

8.结果的转发和重定向

@Controller

@RequestMapping(value="/emp")

public class EmpAction {

    @RequestMapping(value="/find")

    public String findEmpById(int id,Model model) throws Exception{

        System.out.println("查询"+id+"号员工信息");

        //转发到EmpAction的另一个方法中去，即再次发送请求

        return "forward:/emp/update.action";

        //重定向到EmpAction的另一个方法中去，即再次发送请求

        //return "redirect:/emp/update.action?id=" + id;

    }

    @RequestMapping(value="/update")

    public String updateEmpById(int id,Model model) throws Exception{

        System.out.println("更新" + id +"号员工信息");

        model.addAttribute("message","更新员工信息成功");

        return "/jsp/ok.jsp";

    }

}

9.异步发送表单数据到JavaBean，并响应JSON文本返回

1.导入包jackson-core-asl-1.9.11、jackson-mapper-asl-1.9.11

2.配置json转换器

    <!--json转换器-->

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

        <property name="messageConverters">

            <list>

                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>

            </list>

        </property>

    </bean>

3.方法名中加注解

    /**

     * @ResponseBody Emp 表示让springmvc将Emp对象转成json文本

     */

    @RequestMapping(value="/bean2json")

    public @ResponseBody Emp bean2json() throws Exception{

        //创建Emp对象

        Emp emp = new Emp();

        emp.setId(1);

        emp.setUsername("哈哈");

        emp.setSalary(7000D);

        emp.setHiredate(new Date());

        return emp;

    }

    @RequestMapping(value="/listbean2json")

    public @ResponseBody List<Emp> listbean2json() throws Exception{

        //创建List对象

        List<Emp> empList = new ArrayList<Emp>();

        //向List对象中添加三个Emp对象

        empList.add(new Emp(1,"哈哈",7000D,new Date()));

        empList.add(new Emp(2,"呵呵",8000D,new Date()));

        empList.add(new Emp(3,"嘻嘻",9000D,new Date()));

        //返回需要转JSON文本的对象

        return empList;

    }

    @RequestMapping(value="/map2json")

    public @ResponseBody Map<String,Object> map2json() throws Exception{

        //创建List对象

        List<Emp> empList = new ArrayList<Emp>();

        //向List对象中添加三个Emp对象

        empList.add(new Emp(1,"哈哈",7000D,new Date()));

        empList.add(new Emp(2,"呵呵",8000D,new Date()));

        empList.add(new Emp(3,"嘻嘻",9000D,new Date()));

        //创建Map对象

        Map<String,Object> map = new LinkedHashMap<String,Object>();

        //向Map对象中绑定二个变量

        map.put("total",empList.size());

        map.put("rows",empList);

        //返回需要转JSON文本的对象

        return map;

    }

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