一个例子胜过千言万语，直接上代码
SpringMVC的Controller控制器返回值详解
SpringMVC Controller 返回值几种类型
Spring MVC 更灵活的控制 json 返回（自定义过滤字段） 另1
/**
*
* @return Bean
*/
@RequestMapping("/Test")
@ResponseBody
public TestBean test (){
log.debug("Test function");
TestBean testBean=new TestBean();
testBean.setName("haha");
return testBean;
}
/**
*
* @return Bean List
*/
@RequestMapping("/TestList")
@ResponseBody
public List<TestBean> testList (){
log.debug("TestList function");
List<TestBean> testBeanList=new ArrayList<TestBean>();
TestBean testBean1=new TestBean();
testBean1.setName("haha");
TestBean testBean2=new TestBean();
testBean2.setName("hehe");
testBeanList.add(testBean1);
testBeanList.add(testBean2);
return testBeanList;
} /**
*
* @return JSON Data
*/
@RequestMapping("/TestJSONObject")
public void testReturrnJSONWithoutBean(HttpServletRequest request,HttpServletResponse response) throws IOException{
log.debug("TestJSONObject function");
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
PrintWriter writer=response.getWriter();
JsonObject jsonObject=new JsonObject();
jsonObject.addProperty("name","hehe jsonobject");
writer.println(jsonObject.toString());
writer.close();
} /**
*
* @return String
*/
@RequestMapping("/TestReturnPage")
@ResponseBody
public String testReturrnPage(){
log.debug("TestReturnPage");
return "/testpage";
} /**
* The difference between model and modelandview is just sematic
* */
/**
* @return JSON ModelAndView
*/
@RequestMapping("/TestReturnModel")
public String testReturnModel(Model model){
log.debug("testReturrnModel");
model.addAttribute("testmodel", "hello model");
return "testpage";
}
/**
* The difference between model and modelandview is just sematic
* */
/**
* @return JSON ModelAndView
*/
@RequestMapping("/TestReturnModelAndView")
public ModelAndView testReturnModelAndView(){
log.debug("testReturrnModel");
ModelAndView mav = new ModelAndView("testpage");
mav.addObject("testmodel", "hello test model");
return mav;
} /**
* 获取系统显示的菜单
*
* @param 无
* @return 返回JSON字符串，这是经过处理后的结构化树形数据。
*/
@RequestMapping(value = "/getShowedMenus", produces = "application/json; charset=utf-8")
@ResponseBody
public String getShowedMenus() {
JsonArray menus=new JsonArray();
try{
menus=platformMenuService.getMenusForShow();
}catch(Exception e)
{
logger.error(e.toString());
e.printStackTrace();
}
return menus.toString();
}
/**
* 从远程数据中心中注销登录
* @param request
* @param response
* @return 返回逻辑值
*/
@RequestMapping("/logout")
@ResponseBody
private boolean logout(HttpServletRequest request,HttpServletResponse response)
{
boolean retVal=false;
try{ }catch(Exception e){
logger.error(e.toString());
}
return retVal;
}
/**
* 本地数据中心登录至远程数据中心。
* @param datacenterId
* @return 返回是否登录成功
*/
@RequestMapping(value="/login",produces = "application/json; charset=utf-8")
@ResponseBody
public Boolean login(String dcId,HttpServletRequest request,HttpServletResponse response) {
logger.info("datacenterId"+dcId);
dcId="12";
Boolean retVal=false;
try{
DatacatalogDatacenter dc=datacenterService.selectByPrimaryKey(dcId);
String url="http://localhost:8080/"+request.getContextPath()+"/rest/datacatalog/datacenter/server/login?&no=121";
String val=HttpUtils.HttpPost(url);
retVal=Boolean.parseBoolean(val);
//retObject=new JSONObject(detail);
}catch(Exception e){
logger.error(e.toString());
e.printStackTrace();
}
return retVal;
}
//使用request转向页面
@RequestMapping("/itemList2")
public void itmeList2(HttpServletRequest request, HttpServletResponse response) throws Exception {
// 查询商品列表
List<Items> itemList = itemService.getItemList();
// 向页面传递参数
request.setAttribute("itemList", itemList);
// 如果使用原始的方式做页面跳转，必须给的是jsp的完整路径
request.getRequestDispatcher("/WEB-INF/jsp/itemList.jsp").forward(request, response);
}
也通过response实现页面重定向：
response.sendRedirect("url")
如：
@RequestMapping("/itemList2")
public void itmeList2(HttpServletRequest request, HttpServletResponse response) throws Exception {
PrintWriter writer = response.getWriter();
response.setCharacterEncoding("utf-8");
response.setContentType("application/json;charset=utf-8");
writer.write("{\"id\":\"123\"}");
第一种，通过request.setAttribute进行返回。 @RequestMapping(value="/welcomeF")
public String WelcomeF(User user,HttpServletRequest request){
System.out.println(user.toString());
/*通过setAttribute来设置返回*/
request.setAttribute("name", user.getName());
request.setAttribute("password", user.getPassword());
request.setAttribute("password", user.getHobby());
return "welcome";
} 第二种，通过ModelAndView进行返回。 @RequestMapping(value="/welcomeSeven")
public ModelAndView WelcomeSeven(User2 user2){
/*通过ModelAndView来返回数据*/
ModelAndView mav = new ModelAndView("welcome");
mav.addObject("name", user2.getName());
mav.addObject("date", user2.getUdate());
return mav;
} 第三种，通过model对象进行返回。 @RequestMapping(value="/welcomeEight")
public String WelcomeEight(User2 user2,Model model){
/*通过Model对象来返回数据*/
model.addAttribute("name", user2.getName());
model.addAttribute("date", user2.getUdate());
return "welcome";
} 第四种，通过Map对象进行返回。 @RequestMapping(value="/welcomeNine")
public String WelcomeNine(User2 user2,Map map){
/*通过Model对象来返回数据*/
map.put("name", user2.getName());
map.put("date", user2.getUdate());
return "welcome";
}
spring mvc返回json数据，只需要返回一个java bean对象就行，只要这个java bean 对象实现了序列化serializeable
@RequestMapping(value = { "/actor_details" }, method = { RequestMethod.POST })
@ResponseBody
public ResultObject actorDetails(@RequestBody ActorDetailsRequest req) {
logger.debug("查看{}主播信息", req.getAid());
if (req.getAid() == null || req.getAid().equals("null")
|| req.getAid().equals("")) {
return new ResultObject(ResultCode.NULL_PARAM);
}
ActorAndUser result = actorServiceImpl.queryActorData(req.getAid());
return new ResultObject(result);
}
ModelAndView
@RequestMapping(method=RequestMethod.GET)
public ModelAndView index(){
ModelAndView modelAndView = new ModelAndView("/user/index");
modelAndView.addObject("xxx", "xxx");
return modelAndView;
}
@RequestMapping(method=RequestMethod.GET)
public ModelAndView index(){
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("xxx", "xxx");
modelAndView.setViewName("/user/index");
return modelAndView;
}
Map
响应的view应该也是该请求的view。等同于void返回。
@RequestMapping(method=RequestMethod.GET)
public Map<String, String> index(){
Map<String, String> map = new HashMap<String, String>();
map.put("1", "1");
//map.put相当于request.setAttribute方法
return map;
}
@RequestMapping("/demo2/show")
publicMap<String, String> getMap() {
Map<String, String> map = newHashMap<String, String>();
map.put("key1", "value-1");
map.put("key2", "value-2");
returnmap;
}
在jsp页面中可直通过${key1}获得到值, map.put()相当于request.setAttribute方法。
写例子时发现，key值包括 - . 时会有问题.
String
对于String的返回类型，笔者是配合Model来使用的；
@RequestMapping(method = RequestMethod.GET)2
public String index(Model model) {
String retVal = "user/index";
List<User> users = userService.getUsers();
model.addAttribute("users", users);
return retVal;
}
或者通过配合@ResponseBody来将内容或者对象作为HTTP响应正文返回（适合做即时校验）；
@RequestMapping(value = "/valid", method = RequestMethod.GET)
public @ResponseBody
String valid(@RequestParam(value = "userId", required = false) Integer userId,@RequestParam(value = "logName") String strLogName) {
return String.valueOf(!userService.isLogNameExist(strLogName, userId));
}
具体参考：https://blog.****.net/u011001084/article/details/52846791 太长了，没整理
@RequestMapping(value=”twoB.do”)
public void twoBCode(HttpServletRequest request,HttpServletResponse response) {
response.setContentType(“type=text/html;charset=UTF-8”);
String s = “一堆字符串……”;
response.getWriter().write(s);
return;
} 上面的太low，用下面的比较好
@RequestMapping(value=”getJosn.do”, produces=”text/html;charset=UTF-8”)
@ResponseBody
public String getTabJson(){
String json = “{“无主题”:”jjjjj”}”;
return json;
}