Spring Boot Ajax示例

左手的ㄟ右手 2023-02-15 05:13 60阅读 0赞

本文将向您展示如何使用`jQuery.ajax`将HTML表单请求发送到`Spring REST API`并返回JSON响应。

使用的工具 ：

1.  Spring Boot 1.5.1。发布
2.  Spring4.3.6。发布
3.  Maven 3
4.  jQuery的
5.  引导程序3

> **注意**  
> 您可能对这个经典的[Spring MVC Ajax示例][Spring MVC Ajax]感兴趣

## 1.项目结构 ##

标准的Maven项目结构。

![Spring Boot Ajax示例][Spring Boot Ajax]![Spring Boot Ajax示例][Spring Boot Ajax 1]

## 2.项目依赖性 ##

一个普通的Spring Boot依赖项和一些`webjars`资源。

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
    	http://maven.apache.org/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.mkyong</groupId>
        <artifactId>spring-boot-ajax-example</artifactId>
        <packaging>jar</packaging>
        <version>1.0</version>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.1.RELEASE</version>
        </parent>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
            </dependency>
    
            <dependency>
                <groupId>org.webjars</groupId>
                <artifactId>jquery</artifactId>
                <version>2.2.4</version>
            </dependency>
    
            <dependency>
                <groupId>org.webjars</groupId>
                <artifactId>bootstrap</artifactId>
                <version>3.3.7</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

## 3. Spring REST API ##

3.1 REST控制器，接受`SearchCriteria`并返回`ResponseEntity`

SearchController.java

package com.mkyong.controller;
    
    import com.mkyong.model.AjaxResponseBody;
    import com.mkyong.model.SearchCriteria;
    import com.mkyong.model.User;
    import com.mkyong.services.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.ResponseEntity;
    import org.springframework.validation.Errors;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.validation.Valid;
    import java.util.List;
    import java.util.stream.Collectors;
    
    @RestController
    public class SearchController {
    
        UserService userService;
    
        @Autowired
        public void setUserService(UserService userService) {
            this.userService = userService;
        }
    
        @PostMapping("/api/search")
        public ResponseEntity<?> getSearchResultViaAjax(
                @Valid @RequestBody SearchCriteria search, Errors errors) {
    
            AjaxResponseBody result = new AjaxResponseBody();
    
            //If error, just return a 400 bad request, along with the error message
            if (errors.hasErrors()) {
    
                result.setMsg(errors.getAllErrors()
                            .stream().map(x -> x.getDefaultMessage())
                            .collect(Collectors.joining(",")));
    
                return ResponseEntity.badRequest().body(result);
    
            }
    
            List<User> users = userService.findByUserNameOrEmail(search.getUsername());
            if (users.isEmpty()) {
                result.setMsg("no user found!");
            } else {
                result.setMsg("success");
            }
            result.setResult(users);
    
            return ResponseEntity.ok(result);
    
        }
    
    }

3.2一些POJO。

AjaxResponseBody.java

package com.mkyong.model;
    
    import java.util.List;
    
    public class AjaxResponseBody {
    
        String msg;
        List<User> result;
    
        //getters and setters
    
    }

User.java

package com.mkyong.model;
    
    public class User {
    
        String username;
        String password;
        String email;
    
        public User(String username, String password, String email) {
            this.username = username;
            this.password = password;
            this.email = email;
        }
    
        //getters and setters
    }

3.3验证。

SearchCriteria.java

package com.mkyong.model;
    
    import org.hibernate.validator.constraints.NotBlank;
    
    public class SearchCriteria {
    
        @NotBlank(message = "username can't empty!")
        String username;
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    }

3.4初始化一些用户进行搜索的服务。

UserService.java

package com.mkyong.services;
    
    import com.mkyong.model.User;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.PostConstruct;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.stream.Collectors;
    
    @Service
    public class UserService {
    
        private List<User> users;
    
        // Love Java 8
        public List<User> findByUserNameOrEmail(String username) {
    
            List<User> result = users.stream()
                .filter(x -> x.getUsername().equalsIgnoreCase(username))
                .collect(Collectors.toList());
    
            return result;
    
        }
    
        // Init some users for testing
        @PostConstruct
        private void iniDataForTesting() {
    
            users = new ArrayList<User>();
    
            User user1 = new User("mkyong", "password111", "mkyong@yahoo.com");
            User user2 = new User("yflow", "password222", "yflow@yahoo.com");
            User user3 = new User("laplap", "password333", "mkyong@yahoo.com");
    
            users.add(user1);
            users.add(user2);
            users.add(user3);
    
        }
    
    }

3.5 Spring Boot Starter。

UserService.java

package com.mkyong;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringBootWebApplication {
    
        public static void main(String[] args) throws Exception {
            SpringApplication.run(SpringBootWebApplication.class, args);
        }
    
    }

## 4. HTML表单+ jQuery Ajax ##

4.1一个简单的HTML表单，装饰有引导程序。

ajax.html

<!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org">
    
    <head>
        <title>Spring Boot ajax example</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    
        <link rel="stylesheet" type="text/css"
              href="webjars/bootstrap/3.3.7/css/bootstrap.min.css"/>
    </head>
    <body>
    
    <nav class="navbar navbar-inverse">
        <div class="container">
            <div class="navbar-header">
                <a class="navbar-brand" href="#">Mkyong.com</a>
            </div>
        </div>
    </nav>
    
    <div class="container" style="min-height: 500px">
    
        <div class="starter-template">
            <h1>Spring Boot AJAX Example</h1>
    
            <div id="feedback"></div>
    
            <form class="form-horizontal" id="search-form">
                <div class="form-group form-group-lg">
                    <label class="col-sm-2 control-label">Username</label>
                    <div class="col-sm-10">
                        <input type="text" class="form-control" id="username"/>
                    </div>
                </div>
    
                <div class="form-group">
                    <div class="col-sm-offset-2 col-sm-10">
                        <button type="submit" id="bth-search"
                                class="btn btn-primary btn-lg">Search
                        </button>
                    </div>
                </div>
            </form>
    
        </div>
    
    </div>
    
    <div class="container">
        <footer>
            <p>
                © <a href="http://www.mkyong.com">Mkyong.com</a> 2017
            </p>
        </footer>
    </div>
    
    <script type="text/javascript"
            src="webjars/jquery/2.2.4/jquery.min.js"></script>
    
    <script type="text/javascript" src="js/main.js"></script>
    
    </body>
    </html>

4.2获取HTML表单，通过`JSON.stringify`将搜索条件转换为JSON格式，并通过`jQuery.ajax`发送POST请求

main.js

$(document).ready(function () {
    
        $("#search-form").submit(function (event) {
    
            //stop submit the form, we will post it manually.
            event.preventDefault();
    
            fire_ajax_submit();
    
        });
    
    });
    
    function fire_ajax_submit() {
    
        var search = {}
        search["username"] = $("#username").val();
    
        $("#btn-search").prop("disabled", true);
    
        $.ajax({
            type: "POST",
            contentType: "application/json",
            url: "/api/search",
            data: JSON.stringify(search),
            dataType: 'json',
            cache: false,
            timeout: 600000,
            success: function (data) {
    
                var json = "<h4>Ajax Response</h4><pre>"
                    + JSON.stringify(data, null, 4) + "</pre>";
                $('#feedback').html(json);
    
                console.log("SUCCESS : ", data);
                $("#btn-search").prop("disabled", false);
    
            },
            error: function (e) {
    
                var json = "<h4>Ajax Response</h4><pre>"
                    + e.responseText + "</pre>";
                $('#feedback').html(json);
    
                console.log("ERROR : ", e);
                $("#btn-search").prop("disabled", false);
    
            }
        });
    
    }

做完了

## 5.演示 ##

5.1启动Spring Boot

Terminal

$ mvn spring-boot:run
    
      .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v1.5.1.RELEASE)
    
    2017-02-03 14:56:36 DEBUG com.mkyong.SpringBootWebApplication - Running with Spring Boot v1.5.1.RELEASE, Spring v4.3.6.RELEASE
    2017-02-03 14:56:36 INFO  com.mkyong.SpringBootWebApplication - No active profile set, falling back to default profiles: default
    2017-02-03 14:56:39 INFO  com.mkyong.SpringBootWebApplication - Started SpringBootWebApplication in 2.828 seconds (JVM running for 3.295)

5.2访问*http：// localhost：8080 /*

![format_png][]![format_png 1][]

5.3如果用户名为空！

![format_png 2][]![format_png 3][]

![format_png 4][]![format_png 5][]

5.4如果找不到用户名！

![format_png 6][]![format_png 7][]

5.5如果找到用户名！

![format_png 8][]![format_png 9][]

![format_png 10][]![format_png 11][]

## 6.下载源代码 ##

> 下载– [spring-boot-ajax-example.zip][] （10 KB）

## 参考文献 ##

1.  [Spring IO –构建RESTful Web服务][Spring IO _RESTful Web]
2.  [MDN – JSON.stringify（）][MDN _ JSON.stringify]
3.  [Spring 4 MVC Ajax Hello World示例][Spring MVC Ajax]

标签： [Ajax][] [jQuery][] [JSON][] [休息][Link 1] [春天引导][Link 2]

> 翻译自: [https://mkyong.com/spring-boot/spring-boot-ajax-example/][https_mkyong.com_spring-boot_spring-boot-ajax-example]

[Spring MVC Ajax]: http://www.mkyong.com/spring-mvc/spring-4-mvc-ajax-hello-world-example/
[Spring Boot Ajax]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS5wbmc?x-oss-process=image/format,png
[Spring Boot Ajax 1]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUucG5n?x-oss-process=image/format,png
[format_png]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS0xLnBuZw?x-oss-process=image/format,png
[format_png 1]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtMS5wbmc?x-oss-process=image/format,png
[format_png 2]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS0yLnBuZw?x-oss-process=image/format,png
[format_png 3]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtMi5wbmc?x-oss-process=image/format,png
[format_png 4]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS1oZWFkZXItMi5wbmc?x-oss-process=image/format,png
[format_png 5]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtaGVhZGVyLTIucG5n?x-oss-process=image/format,png
[format_png 6]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS0zLnBuZw?x-oss-process=image/format,png
[format_png 7]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtMy5wbmc?x-oss-process=image/format,png
[format_png 8]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS00LnBuZw?x-oss-process=image/format,png
[format_png 9]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtNC5wbmc?x-oss-process=image/format,png
[format_png 10]: http://imgconvert.csdnimg.cn/aHR0cDovL3d3dy5ta3lvbmcuY29tL3dwLWNvbnRlbnQvdXBsb2Fkcy8yMDE3LzAyL3NwcmluZy1ib290LWFqYXgtZXhhbXBsZS1oZWFkZXItMS5wbmc?x-oss-process=image/format,png
[format_png 11]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly93d3cubWt5b25nLmNvbS93cC1jb250ZW50L3VwbG9hZHMvMjAxNy8wMi9zcHJpbmctYm9vdC1hamF4LWV4YW1wbGUtaGVhZGVyLTEucG5n?x-oss-process=image/format,png
[spring-boot-ajax-example.zip]: http://www.mkyong.com/wp-content/uploads/2017/02/spring-boot-ajax-example.zip
[Spring IO _RESTful Web]: https://spring.io/guides/gs/rest-service/
[MDN _ JSON.stringify]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
[Ajax]: https://mkyong.com/tag/ajax/
[jQuery]: https://mkyong.com/tag/jquery/
[JSON]: https://mkyong.com/tag/json/
[Link 1]: https://mkyong.com/tag/rest/
[Link 2]: https://mkyong.com/tag/spring-boot/
[https_mkyong.com_spring-boot_spring-boot-ajax-example]: https://mkyong.com/spring-boot/spring-boot-ajax-example/