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项目结构;

代码如下：

BookController

package com.mstf.controller;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.jackson.map.ObjectMapper;
import com.mstf.domain.Book;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/json")
public class BookController {
 private static final Log logger = LogFactory.getLog(BookController.class);
 // @RequestMapping 根据 json 数据，转换成对应的 Object
 @RequestMapping(value="/testRequestBody")
 public void setJson(@RequestBody Book book,HttpServletResponse response) throws Exception {
  // ObjectMapper 类是 Jackson 库的主要类。他提供一些功能将 Java 对象转换成对应的 JSON
  ObjectMapper mapper = new ObjectMapper();
  // 将 Book 对象转换成 json 输出
  logger.info(mapper.writeValueAsString(book));
  book.setAuthor("汪政");
  response.setContentType("text/html;charset=UTF-8");
  // 将 Book 对象转换成 json 写到客户端
  response.getWriter().println(mapper.writeValueAsString(book));
 }
}