SpringBoot @PostMapping接收HTTP请求的流数据问题

目录

• @PostMapping接收HTTP请求的流数据
• 关于@PostMapping注解解析
• 总结

@PostMapping接收HTTP请求的流数据

@PostMapping("/test")
public String pushMessage(@RequestBody byte[] data) throws Exception {
    String json = URLDecoder.decode(new String(data, DEFAULT_CHARSET), DEFAULT_CHARSET);
    log.info(">>> 接收CP推送的消息：{}", json);

    JSONObject jsonObject = JacksonUtils.jsonToBean(json, JSONObject.class);
    System.out.println(jsonObject.get("key"));
    return “success”
}

Client 请求

try {
    //创建连接
    URL url = new URL(ADD_URL);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setDoInput(true);
    connection.setRequestMethod("POST");
    connection.setUseCaches(false);
    connection.setInstanceFollowRedirects(true);
    //application/x-javascript
    //text/xml->xml数据
    //application/x-javascript->json对象
    //application/x-www-form-urlencoded->表单数据
    //application/json;charset=utf-8 -> json数据
    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    connection.setRequestProperty("accept", "*/*");
    connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

    connection.connect();

    //POST请求
    DataOutputStream out = new DataOutputStream(connection.getOutputStream());

    JSONObject data = new JSONObject();
    data.element("key", "这是一条测试数据");

    out.writeBytes(data.toString());
    out.flush();
    out.close();

    //读取响应
    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String lines;
    StringBuffer sb = new StringBuffer("");
    while ((lines = reader.readLine()) != null) {
        lines = new String(lines.getBytes(), "utf-8");
        sb.append(lines);
    }
    System.out.println(sb);
    reader.close();
    // 断开连接
    connection.disconnect();
} catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

关于@PostMapping注解解析

开发过程IDEA提示如将@RequestMapping(value="/abc" , method = “RequestMethod.POST”)替换成@PostMapping。现对@PostMapping的实现。

@PostMapping是一个复合注解，Spring framework 4.3引入了@RequestMapping注释的变体，以更好地表示带注释的方法的语义，作为@RequestMapping(method = RequestMethod.POST)的快捷方式。

也就是可以简化成@PostMapping(value="/abc" )即可，主要是方便识记。

下面很多方法都是对应着@RequestMapping的标记的别名。

@RequestMapping(value = “”, path = “”, params = “”, headers = “”,consumes = “”, produces = “”)

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(method = RequestMethod.POST)
public @interface PostMapping {

	/**
	 * RequestMapping 的别名，
	 */
	@AliasFor(annotation = RequestMapping.class)
	String name() default "";

	/**
	 *RequestMapping#value的别名， 默认为空字符串，一般需要自己填写
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] value() default {};

	/**
	 * RequestMapping#path的别名
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] path() default {};

	/**
	 * RequestMapping#params的别名
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] params() default {};

	/**
	 * RequestMapping#headers的别名
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] headers() default {};

	/**
	 * RequestMapping#consumes的别名
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] consumes() default {};

	/**
	 * RequestMapping#produces的别名
	 */
	@AliasFor(annotation = RequestMapping.class)
	String[] produces() default {};

}

其他变体如下：

@GetMapping、@PutMapping、@PatchMapping和@DeleteMapping，与@PostMapping实现类似

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。