MVC parameter passing

MVC parameter passing

　　Request parameter automatic conversion

　　　　JSP page

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 = "Please enter your user name" />
    </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>

　　　　Point * Note: Method Parameter Name in the Controller must be consistent with the value of the name attribute of the form element

/*log in*/
@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 ( "success");
        //login successful
      request.getSession().setAttribute("user",user);
        // forward
        mv.setViewName("index");
    }else{
        //Login failed
        mv.setViewName("login");
    }
    return mv;
}

　　Assembly of the object request parameters POJO

　　　　New Person　　

public class Person {
    private String username;
    private int age;
    // omitted get / set methods
}

　　　　Controller

// When the entity name attribute class attribute names and forms of the same element, to complete the automatic assembly
@RequestMapping(value = "personObject",method = RequestMethod.POST)
public String personObject(Person person){
    System.out.println(person);
    return "hello"; }

　　@RequestParam comment

  　　　　@RequestParam effect that in the case where the controller parameter elements and the form does not match a method using annotations @RequestParam declared parameter name.

            @RequestParam has three attributes:

　　　　　　　　(1) value: request parameter name (must be configured)

　　　　　　　　(2) required: if necessary, the default is true, i.e., the request must include the parameter, if it does not, an exception is thrown (optional)

　　　　　　　　(3) defaultValue: the default value if the value is set, required automatically set to false, regardless of whether you configure required, configure what values ​​are false (optional)

　　　　　　jsp page

<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 = "Please enter your user name" />
    </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>

　　　　　　Controller

@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 "Name:" + userName + ", Password:" + password;
 }　　

　　　　

　　RESTFUL style parameter passing

/ * {ID} placeholder * / 
@RequestMapping ( " / getId / {ID} " )
@ResponseBody
public Object getid(@PathVariable("id") Integer id){
    List<Accounts> name = accountService.getName(id);
    return name;
} 

　　　　

　　Objects passing parameters

　　　　　　IUserInfo entity classes:

package com.cmy.entity;

import java.util.ArrayList;
import java.util.List;

public  class IUserInfo {

    private  int uid;
    private String username;

    // domain attributes injection 
    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 entity classes:

package com.cmy.entity;

public class Teacher {

    private int tid;
    private String teachername;

    public  int getTid () {
         return time;
    }

    public  void setTid ( int time) {
         this .tid = time;
    }

    public String getTeachername() {
        return teachername;
    }

    public void setTeachername(String teachername) {
        this.teachername = teachername;
    }
}

　　　　　　Control Layer

@Controller
@RequestMapping("/fout")
public class FoutController {//属性
    @RequestMapping("/getUser")
    public String getUser(IUserInfo userInfo){
        System.out.println(userInfo.toString());
        return "welcome";
    }

}

　　　　page

　　　　　Domain property (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>

　　　　　Collection (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 = " Please enter a user name " />
                <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>