HttpServletRequest获取POST请求的参数

除了@RequestBody方式外，我们还可以通过HttpServletRequest方式获取参数。

比如参数是：

{
  "code": "xxx"
}

获取方式：

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;

private JSONObject getJsonRequest(HttpServletRequest request) {
   JSONObject result = null;
   StringBuilder sb = new StringBuilder();
   try (BufferedReader reader = request.getReader();) {
       char[] buff = new char[1024];
       int len;
       while ((len = reader.read(buff)) != -1) {
           sb.append(buff, 0, len);
       }
       result = JSONUtil.parseObj(sb.toString());
   } catch (IOException e) {
       log.error("", e);
   }
   return result;
}

sb.toString()就是上面json字符串，转成JSONObject对象后就可以拿到：

@RequestMapping(value = "/login", method = RequestMethod.POST)
public Result login(HttpServletRequest request) {
	JSONObject param = this.getJsonRequest(request);
	String code = param.getStr("code");
	
    // ...
    
}