最近在项目中碰到需要获取post请求中的Json格式的参数, 查阅无数博客 , 然而都以无奈告终.
一般我们获取post请求参数用注解 @RequestBody 就可以获得.
然而这次项目中 我在拦截器中获取post 请求参数 , 就用不上 注解@RequestBody.
最后查阅各大资料 , 终于发现了一篇让我 泪流满面的文章 .上代码:

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import com.alibaba.fastjson.JSONObject;

/**
 * 获取请求Json数据转换类
 */
public class GetRequestJsonUtils {

    public static JSONObject getRequestJsonObject(HttpServletRequest request) throws IOException {
        String json = getRequestJsonString(request);
        return JSONObject.parseObject(json);
    }
    /***
     * 获取 request 中 json 字符串的内容
     *
     * @param request
     * @return : <code>byte[]</code>
     * @throws IOException
     */
    public static String getRequestJsonString(HttpServletRequest request)
            throws IOException {
        String submitMehtod = request.getMethod();
        // GET
        if (submitMehtod.equals("GET")) {
          return new String(request.getQueryString().getBytes("iso-8859-1"),"utf-8").replaceAll("%22", "\"");
            // POST
        } else {
            return getRequestPostStr(request);
        }
    }
     /* @param request
     * @return
     * @throws IOException
     */
    public static byte[] getRequestPostBytes(HttpServletRequest request)
            throws IOException {
        int contentLength = request.getContentLength();
        if(contentLength<0){
            return null;
        }
        byte buffer[] = new byte[contentLength];
        for (int i = 0; i < contentLength;) 
        {
            int readlen = request.getInputStream().read(buffer, i,
                    contentLength - i);
            if (readlen == -1) {
                break;
            }
            i += readlen;
        }
        return buffer;
    }
    /**
     * 描述:获取 post 请求内容
     * <pre>
     * 举例
     * </pre>
     * @param request
     * @return
 * @throws IOException
     */
    public static String getRequestPostStr(HttpServletRequest request)
            throws IOException {
        byte buffer[] = getRequestPostBytes(request);
        String charEncoding = request.getCharacterEncoding();
        if (charEncoding == null) {
            charEncoding = "UTF-8";
        }
        return new String(buffer, charEncoding);
    }
}

就可以获得Json格式的参数啦!
原文地址:
http://blog.csdn.net/tengdazhang770960436/article/details/50149061