SpringMVC的数据响应-回写数据

1.直接返回字符串

其他具体代码请访问chilianjie

 @RequestMapping("/report5")
    public String save5(HttpServletRequest request){
        request.setAttribute("username","哈哈哈");
        return "success";
    }
    @RequestMapping("/report6")
    public void save6(HttpServletResponse response) throws IOException {
        response.getWriter().print("hello zsh");
    }
    @RequestMapping("/report7")
    @ResponseBody  //告诉spring框架不要进行页面跳转
    public String save7() throws IOException {
        return "hell zsh";
    }
    @RequestMapping("/report8")
    @ResponseBody  //告诉spring框架不要进行页面跳转
    public String save8() throws IOException {
        return "hell zsh";
    }
    @RequestMapping("/report9")
    @ResponseBody  //告诉spring框架不要进行页面跳转
    public String save9() throws IOException {
        User user=new User();
        user.setAge(20);
        user.setUsername("lis");
        //使用json的转换工具将对象转换成json格式字符串返回
        ObjectMapper objectMapper=new ObjectMapper();
        String json = objectMapper.writeValueAsString(user);
        return json;
    }

2.返回对象或集合

  @RequestMapping("/report10")
    @ResponseBody
    //让springmvc将user自动转换为json格式的字符串
    public User save10(){
        User user=new User();
        user.setAge(20);
        user.setUsername("lis4");
        return user;
    }

配置处理器映射器

  <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
            </list>
        </property>
    </bean>

我们发现配置处理器映射器非常麻烦，所有可以使用<mvc:annotation-driven/ >注解驱动进行json转换