Spring MVC数据绑定

1.绑定默认数据类型

当前端请求参数较为简单的时候，后台形参可以直接使用SpringMVC提供的参数类型来绑定数据。

HttpServletRequest：通过request对象获取请求信息；

HttpServletResponse: 通过response处理响应对象；

HttpSession: 通过session对象得到session中存储的对象；

Model/ModelMap: Model是一个接口，ModelMap是一个接口的实现，作用是将Model数据填充到request域；

eg:

@Controller
public class UserController{
    @RequestMapping("/selectUser")
    public String selectUser(HttpServletRequest request){
        String id=request.getParamter("id");
        return "success";
    }
}

2.绑定简单数据类型

对应的前端请求路径模式：

http://localhost:8080/projectName/selectUser?user_id=1

后台控制器如下：

@Controller
public class UserController{
    @RequestMapping("/selectUser")
    public String selectUser(@RequestParam Integer id){
        System.out.println("id="+id);
        return "success";
    }
}

3.绑定POJO类型

传递多个参数时候，可以考虑用POJO类型。

eg:

User.java

package com.sjl.POJO;

import java.io.Serializable;

/*对多个数据进行封装*/
public class User implements Serializable {
    private Integer id;
    private String username;
    private Integer password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getPassword() {
        return password;
    }

    public void setPassword(Integer password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password=" + password +
                '}';
    }
}

View Code

UserController.java

 
......


/**
     * 向用户注册页面跳转
     * */
    @RequestMapping("/toRegister")
    public String toRegister(){
        return "register";
    }

    /**
     * 接收用户注册信息
     * */
    @RequestMapping("/registerUser")
    public String selectUser(User user){
       String username=user.getUsername();
       Integer password=user.getPassword();
       System.out.println("username:"+username);
       System.out.println("password:"+password);
       return "success";
    }

......

register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册</title>
</head>
<body>
       <form action="${pageContext.request.contextPath}/registerUser" method="post">
           用户名:<input type="text" name="username"/><br/>
           密&nbsp;&nbsp;&nbsp;码：<input type="text" name="password"><br/>
           &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
           <br/>
           <input type="submit" value="注册">
       </form>
</body>
</html>

success.jsp

<%@ page contentType="text/html;charset=UTF-8" %>
<html>
<head>
    <title>结果页面</title>
</head>
       <body>
               <h1 align="center">OK！</h1>
        </body>
</html>

未完待补充！

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