从request中获取json数据

package com.newpp.core.interceptor;
　　import java.io.BufferedReader;
　　import java.io.ByteArrayInputStream;
　　import java.io.IOException;
　　import java.io.InputStream;
　　import java.io.InputStreamReader;
　　import javax.servlet.ServletInputStream;
　　import javax.servlet.http.HttpServletRequest;
　　import javax.servlet.http.HttpServletRequestWrapper;
　　public class MyRequestWrapper extends HttpServletRequestWrapper {
　　private final String body;
　　public MyRequestWrapper(HttpServletRequest request) throws IOException {
　　super(request);
　　StringBuilder stringBuilder=new StringBuilder();
　　BufferedReader bufferedReader=null;
　　try {
　　InputStream inputStream=request.getInputStream();
　　if (inputStream !=null) {
　　bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
　　char[] charBuffer=new char[128];
　　int bytesRead=-1;
　　while ((bytesRead=bufferedReader.read(charBuffer)) > 0) {
　　stringBuilder.append(charBuffer, 0, bytesRead);
　　}
　　} else {
　　stringBuilder.append("");
　　}
　　} catch (IOException ex) {
　　throw ex;
　　} finally {
　　if (bufferedReader !=null) {
　　try {
　　bufferedReader.close();
　　} catch (IOException ex) {
　　throw ex;
　　}
　　}
　　}
　　body=stringBuilder.toString();
　　}
　　@Override
　　public ServletInputStream getInputStream() throws IOException {
　　final ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(body.getBytes());
　　ServletInputStream servletInputStream=new ServletInputStream() {
　　public int read() throws IOException {
　　return byteArrayInputStream.read();
　　}
　　};
　　return servletInputStream;
　　}
　　@Override
　　public BufferedReader getReader() throws IOException {
　　return new BufferedReader(new InputStreamReader(this.getInputStream()));
　　}
　　public String getBody() {
　　return this.body;
　　}
　　}