SpringMVC数据处理

SpringMVC数据处理包括：提交数据处理和数据显示到UI。

提交数据

（1）参数名相同传递

@RequestMapping(value="/hello")
public String hello(String user)
{
System.out.println(user);
return "index.jsp";
}

（2）参数名不同的传递

@RequestMapping(value="/hello")
public String hello(@RequestParam("name")String username)
{
System.out.println(username);
return "index.jsp";
}

（3）对象传递

@RequestMapping(value="/user")
public String user(User user)
{
System.out.println(user);
return "index.jsp";
}

user类：

public class User {
private String username;
private int id;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User [username=" + username + ", id=" + id + ", password="
+ password + "]";
}

}

数据显示

(1)使用ModelAndView，需要设置视图解析器

@RequestMapping(value="/hello")
public ModelAndView Hello(HttpServletRequest req,HttpServletResponse resp)
{
ModelAndView mv=new ModelAndView();
mv.addObject("msg", "hello first SpringMVC page!");
mv.setViewName("hello");
return mv;
}

（2）使用ModelMap，不能设置跳转的页面

@RequestMapping(value="/user")
public String user(@RequestParam("username")String name,ModelMap mp)
{
mp.addAttribute("name", name);
System.out.println(name);
return "index.jsp";
}