Maven + Spring mvc：前端向后端传递数据

我不是女神ヾ 2021-06-24 16:11 484阅读 0赞

根据前一篇文章，[Maven + Spring mvc： Hello World][Maven _ Spring mvc_ Hello World], 已经介绍了spring mvc的简单使用，此片文章介绍一下，如何利用前端将数据传递到后端。  
添加依赖引用：

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.7</version>
    </dependency>

前端代码：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
    <script type="text/javascript">
        $(function(){
            $("button").click(function(){
                $.ajax({
                    type:"POST",
                    url:"helloworld",
                    contentType:"application/json;charset=utf-8",
                    dataType:"json",
                    data:JSON.stringify({
                            "Name": "test", 
                            "Password": "123456", 
                            "Address": "SD"                     
                    }),
                    success:function(){
                        console.log("success");
                    }
                });
            });
        })
    </script>
    </head>
    <body>
        <h1>hello world.</h1>
        <button>Click</button>
    </body>
    
    </html>

后端代码， 实体类：

package com.iotzzh.entity;
    
    import com.fasterxml.jackson.annotation.JsonProperty;
    
    public class User {
         @JsonProperty(value="Name")
            private String Name;
    
            @JsonProperty(value="Password")
            private String Password;
    
            @JsonProperty(value="Address")
            private String Address;
    
            public String getName() {
                return Name;
            }
            public void setName(String name) {
                Name = name;
            }
            public String getPassword() {
                return Password;
            }
            public void setPassword(String password) {
                Password = password;
            }
            public String getAddress() {
                return Address;
            }
            public void setAddress(String address) {
                Address = address;
            }
    
    
            @Override
            public String toString() {
                // TODO Auto-generated method stub
                return "User:" + Name + "\n" + "Password:" + Password + 
                        "\n" + "Address:" + Address;
            }
    
    }

后端代码，controller 代码：

package com.iotzzh.controller;
    
    import org.springframework.stereotype.Controller;
    import javax.servlet.http.HttpServletRequest;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    import com.iotzzh.entity.User;
    
    
    @Controller
    @RequestMapping("/hello")
    
    public class HelloWorldController {
    
        @RequestMapping(value="/helloworld", method=RequestMethod.POST, produces="application/json;charset=utf-8")
        @ResponseBody
        public void helloworld(@RequestBody User user) {
            System.out.println("success");
            System.out.println(user);
        }
        
         @RequestMapping("/helloworld")
            public String helloworld(){
                System.out.println("nihao");
                return "hello";
            }
    
    }

测试：

![2789632-4ddc4ef4461ecb8c.png][]

点击click按钮：

![2789632-8ff4418b1616a90b.png][]

[Maven _ Spring mvc_ Hello World]: https://www.jianshu.com/p/1b91c2d1c624
[2789632-4ddc4ef4461ecb8c.png]: /images/20210615/6f39119acb5949f9b7771f139ceb11df.png
[2789632-8ff4418b1616a90b.png]: /images/20210615/66a11c0a7e93491cb75d9a74945e9548.png