SpringMVC 处理模型数据：
1 controller接收pojo：
<form action="save" method="get">
<label for="">用户名：<input type="text" name="username" /></label>
<label for="">密码：<input type="password" name="password" /></label>
<label for="">年龄：<input type="text" name="age" /></label>
<label for="">邮箱：<input type="text" name="email" /></label>
<label for="">省份：<input type="text" name="address.province" />
</label> <label for="">城市：<input type="text" name="address.city" /></label>
<button>保存</button>
</form>
@RequestMapping("/save")
public String save(User user) {
System.out.println(user);
return "success";
} 2 controller接收model：
@RequestMapping("/edit2")
public String edit1(Model model) {
User user = new User();
user.setUsername("harry");
user.setPassword("123");
user.setAge(17);
user.setEmail("[email protected]");
Address address = new Address();
address.setProvince("horwards");
address.setCity("potter");
user.setAddress(address);
model.addAttribute("user", user);
return "user/form";
} 3 controller返回modleAndView：
<form action="save" method="get">
<label for="">用户名：<input type="text" name="username" value="${user.username}"/></label>
<label for="">密码：<input type="password" name="password" value="${user.password}"/></label>
<label for="">年龄：<input type="text" name="age" value="${user.age}"/></label>
<label for="">邮箱：<input type="text" name="email" value="${user.email}"/></label>
<label for="">省份：<input type="text" name="address.province" value="${user.address.province}"/></label>
<label for="">城市：<input type="text" name="address.city" value="${user.address.city}"/></label>
<button>保存</button>
</form>
@RequestMapping("/edit")
public ModelAndView edit() {
User user = new User();
user.setUsername("draco");
user.setPassword("123");
user.setAge(17);
user.setEmail("[email protected]");
Address address = new Address();
address.setProvince("horwards");
address.setCity("malfoy");
user.setAddress(address);
ModelAndView mv = new ModelAndView();
mv.setViewName("user/form");
mv.addObject("user", user);
return mv;
}