SpringMVC interceptor 中获取 requestbody

   在拦截器中获取请求体（requestbody）的内容，代码如下：

 

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;
/**
 * 
 * @author 
 * 流的方式获取JSON数据
 */
public class RequestWrapper extends HttpServletRequestWrapper {

	//存放JSON数据主体
	private final String body;
	
	public RequestWrapper(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("UTF-8"));
		ServletInputStream servletInputStream = new ServletInputStream() {
			@Override
			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;
	}
}

 参考：http://stackoverflow.com/questions/10457963/spring-rest-service-retrieving-json-from-request/10458119#10458119