獲取 request 中 json 字符串的內容

package com.ahies.stm.app.util;

import com.google.gson.Gson;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * @Description TODO
 * @Date 2019/8/16 10:44
 * @Author zsj
 */
public class GetRequestJsonUtils {
    public static String getRequestJsonStr(HttpServletRequest request) throws IOException {
        String json = getRequestJsonString(request);
        return  json;
    }
    /***
     * 獲取 request 中 json 字符串的內容
     *
     * @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);
        }
    }

    /**
     * 描述:獲取 post 請求的 byte[] 數組
     * <pre>
     * 舉例：
     * </pre>
     * @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:獲取 post 請求內容
     * <pre>
     * 舉例：
     * </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);
    }


}