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SpringMVC——接收请求参数和页面传参

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spring接收请求参数:

1,使用HttpServletRequest获取

Java代码

@RequestMapping(“/login.do”)
public String login(HttpServletRequest request){
String name = request.getParameter(”name”)
String pass = request.getParameter(”pass”)
}

2,Spring会自动将表单参数注入到方法参数，和表单的name属性保持一致。和Struts2一样

Java代码

@RequestMapping(“/login.do”)
public String login(HttpServletRequest request,
String name,
@RequestParam(“pass”)String password) // 表单属性是pass,用变量password接收
{
syso(name);
syso(password)
}

3,自动注入Bean属性

Java代码

<form action=”login.do”>
用户名：<input name=”name”/>
密码：<input name=”pass”/>
<input type=”submit” value=“登陆”>
</form>
//封装的User类
public class User{
private String name;
private String pass;
}

Java代码

@RequestMapping(“/login.do”)
public String login(User user)
{
syso(user.getName());
syso(user.getPass());
}

向页面传值：

当Controller组件处理后，向jsp页面传值，

1，使用HttpServletRequest 和 Session 然后setAttribute()，就和Servlet中一样

2，使用ModelAndView对象

3，使用ModelMap对象

4，使用@ModelAttribute注解

Model数据会利用HttpServletRequest的Attribute传值到success.jsp中

Java代码

@RequestMapping(“/login.do”)
public ModelAndView login(String name,String pass){
User user = userService.login(name,pwd);
Map<String,Object> data = new HashMap<String,Object>();
data.put(”user”,user);
return new ModelAndView(“success”,data);
}

使用ModelMap参数对象示例:

ModelMap数据会利用HttpServletRequest的Attribute传值到success.jsp中

Java代码

@RequestMapping(“/login.do”)
public　String login(String name,String pass ,ModelMap model){
User user = userService.login(name,pwd);
model.addAttribute(”user”,user);
model.put(”name”,name);
return “success”;
}

使用@ModelAttribute示例

在Controller方法的参数部分或Bean属性方法上使用

@ModelAttribute数据会利用HttpServletRequest的Attribute传值到success.jsp中

Java代码

@RequestMapping(“/login.do”)
public String login(@ModelAttribute(“user”) User user){
//TODO
return “success”;
}
@ModelAttribute(“name”)
public String getName(){
return name;
}

Session存储：

可以利用HttpServletReequest的getSession()方法

Java代码

@RequestMapping(“/login.do”)
public String login(String name,String pwd
ModelMap model,HttpServletRequest request){
User user = serService.login(name,pwd);
HttpSession session = request.getSession();
session.setAttribute(”user”,user);
model.addAttribute(”user”,user);
return “success”;
}

Spring MVC 默认采用的是转发来定位视图，如果要使用重定向，可以如下操作

1，使用RedirectView

2，使用redirect:前缀

Java代码

public ModelAndView login(){
RedirectView view = new RedirectView(“regirst.do”);
return new ModelAndView(view);
}

或者用如下方法，工作中常用的方法：

Java代码

public String login(){
//TODO
return “redirect:regirst.do”;
}

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上一篇SpringMVC数据绑定全面示例（复杂对象，数组等）
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