@responseBody注解的作用是将controller的方法返回的对象通过适当的转换器转换为指定的格式之后,写入到response对象的body区,通常用来返回JSON数据或者是XML数据,需要注意的是,在使用此注解之后不会再走试图处理器,而是直接将数据写入到输入流中,他的效果等同于通过response对象输出指定格式的数据
@RequestMapping("/login") @ResponseBody public User login(User user){ return user; } User字段:userName pwd 那么在前台接收到的数据为:'{"userName":"xxx","pwd":"xxx"}' 效果等同于如下代码: @RequestMapping("/login") public void login(User user, HttpServletResponse response){ response.getWriter.write(JSONObject.fromObject(user).toString()); }
使用springMVC时想临时显示一些信息到浏览器, 但又 懒得加载视图,可用@ResponseBody加原生HttpServletResponse实现
package zhuangzi.controller; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import zhuangzi.dao.UsersDao; import zhuangzi.polo.Users; @Controller @RequestMapping("/user") public class UsersController { @Autowired private UsersDao usersDao; @RequestMapping("/add") @ResponseBody public void add(HttpServletResponse response) throws IOException { Users user = new Users(); user.setNames("庄子"); user.setSex("男"); int count = usersDao.addUsers(user); System.out.println("添加了" + count + "条记录"); response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); out.println("添加了" + count + "条记录"); } }
效果如下: