Spring MVC登录注册以及转换json数据

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)); }}