java 獲取request中的請求參數

1、get 和 post請求方式

 （1）request.getParameterNames(); 獲取所有參數key后。遍歷request.getParameter(key)獲取value

 （2）request.getParameterMap() 。直接包含參數key和value值，簡單方便

 

Map<String, String[]>maps =  request.getParameterMap();

for (Map.Entry<String, String[]> entry : maps.entrySet()) {
     String cs = entry.getKey() + ":"+Arrays.toString(entry.getValue())+";";
}

 

2、獲取請求類型為request  payload方式

 這里就不介紹文件流的了，主要針對 后端采用@RequestBody方式的請求

這類數據通過以上2種方式是獲取不到的，它是存放在流里面，要通過getInputStream()或getReader()方式獲取

public String getRequestData(HttpServletRequest httpServletRequest){
        HttpServletRequestWrapper httpServletRequestWrapper = new HttpServletRequestWrapper(httpServletRequest);
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = null;
        InputStreamReader inputStreamReader=null;
        ServletInputStream servletInputStream =null;
        try {
            servletInputStream =  httpServletRequestWrapper.getInputStream();
            inputStreamReader=new InputStreamReader (servletInputStream, Charset.forName("UTF-8"));
            reader = new BufferedReader(inputStreamReader);
            String line = "";
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            return "";
        }finally {
            try {
                if(servletInputStream!=null){
                    servletInputStream.close();
                }
                if(inputStreamReader!=null){
                    inputStreamReader.close();
                }
                if(reader!=null){
                    reader.close();
                }
            } catch (IOException e) {
                
            }
        }
        return sb.toString ();
    }

需要注意的是getInputStream()這種獲取流的方式  只能用一次，如果多次調用  需要緩存起來，不然流的數據到不了Controller層，報400錯誤