JavaWeb-22-SpringMVC支持ajax返回数据

ゝ一世哀愁。 2023-10-05 08:07 11阅读 0赞

**目录**

一：springmvc返回String-@ResponseBody

二：springmvc返回json数据-@ResponseBody+jackson

1：导包；

2：写配置；

3：@ResponseBody测试

三：@RequestBody：接受json数据；转为对象

四：HttpEntity和ResponseEntity

1:HttpEntity：HttpEntity比RequestBody更强，不仅能拿请求参数还可以拿到请求头

2：ResponEntity：指定返回ResponEntity实体；可以定制响应头和响应内容以及响应代码

--------------------

# 一：springmvc返回String-@ResponseBody #

默认情况下，springMVC的@ResponseBody返回的是String类型，如果返回其他类型则会报错。

@ResponseBody:响应请求体，标注了该注解，返回的信息为字符串而不是页面

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70][]

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# 二：springmvc返回json数据-@ResponseBody+jackson #

## 1：导包； ##

>     
>     
>     <dependency>
>       <groupId>com.fasterxml.jackson.core</groupId>
>       <artifactId>jackson-databind</artifactId>
>       <version>2.11.2</version>
>     </dependency>
>     
>     <dependency>
>       <groupId>com.alibaba</groupId>
>       <artifactId>fastjson</artifactId>
>       <version>1.2.32</version>
>     </dependency>

## 2：写配置； ##

默认情况下，springMVC的@ResponseBody返回的是String类型，如果返回其他类型则会报错。  
使用fastjson的情况下，在springmvc.xml配置里加入：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70 2][]

## 3：**@ResponseBody**测试 ##

@ResponseBody:是将内容或对象作为Http响应正文返回

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# 三：@RequestBody：接受json数据；转为对象 #

是将Http请求正文插入方法中，修饰目标方法的入参

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70 6][]

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# 四：HttpEntity和ResponseEntity #

## 1:HttpEntity：HttpEntity比RequestBody更强，不仅能拿请求参数还可以拿到请求头 ##

/**
         * HttpEntity比RequestBody更强，可以拿到请求头
         * @param person
         * @return
         */
        @ResponseBody
        @RequestMapping("/getheader")
        public String test5(HttpEntity<String> person){
            System.out.println("---"+person);
    
            return "bb";
        }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70 8][]

获得的HttpEntity的实体信息；

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70 9][]

## 2：ResponEntity：指定返回ResponEntity实体；可以定制响应头和响应内容以及响应代码 ##

/**
         * 指定返回ResponEntity实体；可以定制响应头和响应内容以及响应代码
         * @return
         */
        @RequestMapping("/getresp")
        public ResponseEntity<String> test6(){
            String body = "aaa";
            MultiValueMap headers = new HttpHeaders();
            headers.add("key","123");
            ResponseEntity<String> stringResponseEntity = new ResponseEntity<String>(body, headers, HttpStatus.OK);
            return stringResponseEntity;
        }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjk0OTA2_size_16_color_FFFFFF_t_70 10][]

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