MVC参数传递

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>