HttpServletRequest中读取HTTP请求的body

背景

Spring MVC 等框架用久了之后，发现对于POST请求里面如果不使用@RequestBody 好像很难获得POST的body。

HTTP请求中的是字符串数据

字符串读取

void charReader(HttpServletRequest request) {
    BufferedReader br = request.getReader();

    String str, wholeStr = "";
    while((str = br.readLine()) != null){
        wholeStr += str;
}
System.out.println(wholeStr);

}

二进制读取

void binaryReader(HttpServletRequest request) {
        int len = request.getContentLength();
        ServletInputStream iii = request.getInputStream();
        byte[] buffer = new byte[len];
        iii.read(buffer, 0, len);
}

@RequestBody

@RequestMapping(value = "/feedback", method = RequestMethod.POST)
    @ResponseBody
    public ServiceResult feedbackEmail(HttpServletRequest request,
        @RequestBody JSONObject jsonObject
                               ){

       String emailTitle =  jsonObject.get("emailTitle").toString();
       String emailBody = jsonObject.get("emailBody").toString();
}

@RequestBody 可以使用JSONObject， Map ，或者ObjectDTO绑定body。
或者使用

@RequestParam

@RequestMapping(value = "/email", method = RequestMethod.POST)
@ResponseBody

public ServiceResult Email(HttpServletRequest request,

@RequestParam("emailTitle")String emailTitle,

@RequestParam("emailBody")String emailBody)  {



  BufferedReader br = request.getReader();


    while((str1 = br.readLine()) != null) {

    wholeStr += str1;

}

注意

request.getInputStream(); request.getReader();和request.getParameter(“key”);这三个函数中任何一个函数执行一次后（可正常读取body数据），之后再执行就无效了。

参考:
http://blog.csdn.net/zxygww/article/details/47045055（body数据读取）
http://blog.csdn.net/xkhgnc_6666/article/details/51767838（post请求中参数为json格式）