MVC参数传递

　　请求参数自动类型转换

　　　　JSP页面

form class="loginForm" action="/user/getUser" method="post" >

    <div class="inputbox"  style="text-align:center; ">

        <label for="user">用户名：</label>

        <input id="user" type="text" name="userName" placeholder="请输入用户名" />

    </div>

    <div class="password"  style="text-align:center; " >

        <label for="mima">密码：</label>

        <input id="mima" type="password" name="password" placeholder="请输入密码" />

    </div>

    <div class="subBtn"  style="text-align:center; ">

        <input type="submit" value="登录" />

        <input type="reset" value="重置"/>

    </div>

</form>

　　　　注意点*:控制器Controller中的方法参数名称必须和表单元素的name属性值保持一致

/*登录*/

@RequestMapping("/getUser")

@ResponseBody

private ModelAndView getUser(String userName, String password, ModelAndView mv, HttpServletRequest request, HttpServletResponse response, HttpSession session){

    Users user = userService.getUser(userName,password);

    System.out.println("user======"+user);

    if (user!=null){

        System.out.println("成功");

        //登录成功

      request.getSession().setAttribute("user",user);

        //转发

        mv.setViewName("index");

    }else{

        //登录失败

        mv.setViewName("login");

    }

    return mv;

}

　　请求参数装配为POJO对象

　　　　新增Person　　

public class Person {

    private String username;

    private int age;

    //省略get/set方法

}

　　　　控制器

//当实体类中的属性名和表单元素的name属性相同时，即可完成自动装配

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

public String personObject(Person person){

    System.out.println(person);

    return "hello";

}

　　@RequestParam注解

　　　　@RequestParam的作用是，当表单元素与控制器方法的参数不匹配的情况下，使用@RequestParam注解声明参数名称。

@RequestParam 有三个属性：

　　　　　　　　（1）value：请求参数名（必须配置）

　　　　　　　　（2）required：是否必需，默认为 true，即请求中必须包含该参数，如果没有包含，将会抛出异常（可选配置）

　　　　　　　　（3）defaultValue：默认值，如果设置了该值，required 将自动设为 false，无论你是否配置了required，配置了什么值，都是 false（可选配置)

　　　　　　jsp页面

<form class="loginForm" action="/getUser" method="post" onsubmit="return check()" >

    <div class="inputbox"  style="text-align:center; ">

        <label for="user">用户名：</label>

        <input id="user" type="text" name="userName" placeholder="请输入用户名" />

    </div>

    <div class="password"  style="text-align:center; " >

        <label for="mima">密码：</label>

        <input id="mima" type="password" name="password" placeholder="请输入密码" />

    </div>

    <div class="subBtn"  style="text-align:center; ">

        <input type="submit" value="登录" />

        <input type="reset" value="重置"/>

    </div>

</form>

　　　　　　控制器

@RequestMapping(value = "/getUser",produces = "text/json;charset=UTF-8")

 @ResponseBody

 public String getUser(String userName,@RequestParam( name="password", required = true,defaultValue ="123" ) String password){

     return "姓名："+userName+",密码："+password;

 }

　　RESTFUL风格的参数传递

/*{id}表示占位符*/

@RequestMapping("/getid/{id}")

@ResponseBody

public Object getid(@PathVariable("id") Integer id){

    List<Accounts> name = accountService.getName(id);

    return name;

}

　　对象传递参数

　　　　　　IUserInfo实体类：

package com.cmy.entity;

import java.util.ArrayList;

import java.util.List;

public class IUserInfo {

    private  int uid;

    private String username;

    //域属性注入

    private Teacher teacher;

    private List<Teacher> teacherList;

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public int getUid() {

        return uid;

    }

    public void setUid(int uid) {

        this.uid = uid;

    }

    public Teacher getTeacher() {

        return teacher;

    }

    public void setTeacher(Teacher teacher) {

        this.teacher = teacher;

    }

    public List<Teacher> getTeacherList() {

        return teacherList;

    }

    public void setTeacherList(List<Teacher> teacherList) {

        this.teacherList = teacherList;

    }

    @Override

    public String toString() {

        return "IUserInfo{" +

                "uid=" + uid +

                ", username='" + username + '\'' +

                ", teacher=" + teacher +

                ", teacherList=" + teacherList +

                '}';

    }

}

　　　　　　Teacher实体类：

package com.cmy.entity;

public class Teacher {

    private int tid;

    private String teachername;

    public int getTid() {

        return tid;

    }

    public void setTid(int tid) {

        this.tid = tid;

    }

    public String getTeachername() {

        return teachername;

    }

    public void setTeachername(String teachername) {

        this.teachername = teachername;

    }

}

　　　　　　控制层

@Controller

@RequestMapping("/fout")

public class FoutController {//属性

    @RequestMapping("/getUser")

    public String getUser(IUserInfo userInfo){

        System.out.println(userInfo.toString());

        return "welcome";

    }

}

　　　　页面

　　　　　域属性(1)

 <form class="loginForm" action="/fout/getUser" method="post" onsubmit="return check()" >

            <div class="inputbox"  style="text-align:center; ">

                <label for="user">用户名：</label>

                <input id="user" type="text" name="teacher.teachername" placeholder="请输入用户名" />

                <input id="users" type="text" name="teacher.teachername" placeholder="请输入用户名" />

            </div>

            <div class="password"  style="text-align:center; " >

                <label for="mima">密码：</label>

                <input id="mima" type="password" name="password" placeholder="请输入密码" />

            </div>

            <div class="subBtn"  style="text-align:center; ">

                <input type="submit" value="登录" />

                <input type="reset" value="重置"/>

            </div>

        </form>

　　　　　集合(2)

 <form class="loginForm" action="/fout/getUser" method="post" onsubmit="return check()" >

            <div class="inputbox"  style="text-align:center; ">

                <label for="user">用户名：</label>

                <input id="user" type="text" name="teacherList[0].teachername" placeholder="请输入用户名" />

                <input id="users" type="text" name="teacherList[1].teachername" placeholder="请输入用户名" />

            </div>

            <div class="password"  style="text-align:center; " >

                <label for="mima">密码：</label>

                <input id="mima" type="password" name="password" placeholder="请输入密码" />

            </div>

            <div class="subBtn"  style="text-align:center; ">

                <input type="submit" value="登录" />

                <input type="reset" value="重置"/>

            </div>

        </form>

巴特西

MVC参数传递

MVC参数传递

请求参数自动类型转换

请求参数装配为POJO对象

@RequestParam注解

RESTFUL风格的参数传递

对象传递参数

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