SpringMVC 方法四种类型返回值总结(你用过几种)

@RequestMapping("/book")
public ModelAndView getAllBook() {
  ModelAndView mv = new ModelAndView();
  List<Book> books = new ArrayList<>();
  Book b1 = new Book();
  b1.setId(1);
  b1.setName("三国演义");
  b1.setAuthor("罗贯中");
  books.add(b1);
  Book b2 = new Book();
  b2.setId(2);
  b2.setName("红楼梦");
  b2.setAuthor("曹雪芹");
  books.add(b2);
  //指定数据模型
  mv.addObject("bs", books);
  mv.setViewName("book");//指定视图名
  return mv;
}

@RequestMapping("/test2")
@ResponseBody
public void test2(){
  //你的代码
}

@RequestMapping("/test1")
@ResponseBody
public void test1(HttpServletResponse resp){
  resp.setStatus(302);
  resp.addHeader("Location","/aa/index");
}

@RequestMapping("/test1")
@ResponseBody
public void test1(HttpServletResponse resp){
  resp.sendRedirect("/aa/index");
}

@GetMapping("/test5")
public void test5(HttpServletRequest req,HttpServletResponse resp) {
  req.getRequestDispatcher("/WEB-INF/jsp/index.jsp").forward(req,resp);
}

@RequestMapping("/test2")
@ResponseBody
public void test2(HttpServletResponse resp) throws IOException {
  resp.setContentType("application/json;charset=utf-8");
  PrintWriter out = resp.getWriter();
  List<Book> books = new ArrayList<>();
  Book b1 = new Book();
  b1.setId(1);
  b1.setName("三国演义");
  b1.setAuthor("罗贯中");
  books.add(b1);
  Book b2 = new Book();
  b2.setId(2);
  b2.setName("红楼梦");
  b2.setAuthor("曹雪芹");
  books.add(b2);
  String s = new Gson().toJson(books);
  out.write(s);
  out.flush();
  out.close();
}

@RequestMapping("/hello")
public String aaa(Model model) {
  model.addAttribute("username", "张三");
  return "hello";
}

@RequestMapping("/test4")
public String test4() {
  return "redirect:/aa/index";
}

@RequestMapping("/test3")
public String test3() {
  return "forward:/WEB-INF/jsp/order.jsp";
}

@RestController
public class HelloController {
  @GetMapping("/hello")
  public String hello() {
    return "hello provider!";
  }
}

@Controller
public class HelloController {
  @GetMapping("/hello")
  @ResponseBody
  public String hello() {
    return "hello provider!";
  }
}

@GetMapping("/user")
@ResponseBody
public User getUser() {
  User user = new User();
  List<String> favorites = new ArrayList<>();
  favorites.add("足球");
  favorites.add("篮球");
  user.setFavorites(favorites);
  user.setUsername("zhagnsan");
  user.setPassword("123");
  return user;
}
@GetMapping("/users")
@ResponseBody
public List<User> getALlUser() {
  List<User> users = new ArrayList<>();
  for (int i = 0; i < 10; i++) {
    User e = new User();
    e.setUsername("zhangsan:" + i);
    e.setPassword("pwd:" + i);
    users.add(e);
  }
  return users;
}