@responseBody注解的作用是將controller的方法返回的對(duì)象通過(guò)適當(dāng)?shù)霓D(zhuǎn)換器轉(zhuǎn)換為指定的格式之后，寫(xiě)入到response對(duì)象的body區(qū)，通常用來(lái)返回JSON數(shù)據(jù)或者是XML數(shù)據(jù)，需要注意的是，在使用此注解之后不會(huì)再走試圖處理器，而是直接將數(shù)據(jù)寫(xiě)入到輸入流中，他的效果等同于通過(guò)response對(duì)象輸出指定格式的數(shù)據(jù)
@RequestMapping("/login")
@ResponseBody
public User login(User user){
return user;
}
User字段：userName pwd
那么在前臺(tái)接收到的數(shù)據(jù)為：'{"userName":"xxx","pwd":"xxx"}'
效果等同于如下代碼：
@RequestMapping("/login")
public void login(User user, HttpServletResponse response){
response.getWriter.write(JSONObject.fromObject(user).toString());
}使用springMVC時(shí)想臨時(shí)顯示一些信息到瀏覽器， 但又 懶得加載視圖，可用@ResponseBody加原生HttpServletResponse實(shí)現(xiàn)
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("莊子");
user.setSex("男");
int count = usersDao.addUsers(user);
System.out.println("添加了" + count + "條記錄");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("添加了" + count + "條記錄");
}
}效果如下：
