spring mvc 支援如下的返回方式：ModelAndView, Model, ModelMap, Map,View, String, void。

Map

@RequestMapping("/demo2/show")

public Map<String, String> getMap() {

Map<String, String> map = new HashMap<String, String>();

map.put("key1", "value-1");

map.put("key2", "value-2");

return map;

}

在jsp頁面中可直透過${key1}獲得到值, map.put()相當於request.setAttribute方法。

頁面上這麼寫：

<c:forEach items="${map}" var="entry">

<c:out value="${entry.key}" />

<c:out value="${entry.value}" />

</c:forEach>

返回json的例子(使用Jackson):

@RequestMapping("/load1")

@ResponseBody

public String load1(@RequestParam String name,@RequestParam String password) throws IOException{

System.out.println(name+" : "+password);

//return name+" : "+password;

MyDog dog=new MyDog();

dog.setName("小哈");dog.setAge("1歲");dog.setColor("深灰");

ObjectMapper objectMapper = new ObjectMapper();

String jsonString=objectMapper.writeValueAsString(dog);

System.out.println(jsonString);

return jsonString;

}