SpringMVC获取请求参数的方法

1、通过@PathVariabl注解获取路径中传递参数

@RequestMapping(value = "/{name}")

public ModelAndView getPerson(@PathVariable String name){

    System.out.println(name);

    return new ModelAndView("/page"); 

}

 

 

2、用@ModelAttribute注解获取POST请求的FORM表单数据

(1) FORM表单

<form name="loginForm" action="/login" method="post">

    <input type="text" name="name" /><br/><br/>

    <input type="password" name="password" /><br/><br/>

    <input type="submit" value="提交" />

</form>

 

(2) 定义JAVA POJO

public class Person() {

    

    private String name;

 

    private String password;

 

    public String getName() {

        return name;

    }

 

    public void setName(String name) {

        this.name = name;

    }

 

    public String getPassword() {

        return password;

    }

 

    public void setPassword(String password) {

        this.password = password;

    }

 

}

 

(3) 后台代码

@RequestMapping(value="/login", method = RequestMethod.POST)

public ModelAndView toMainPage(@ModelAttribute("person") Person person){

    String name = person.getName();

    System.out.println(name);

    String password = person.getPassword();

    System.out.println(password );

    return new ModelAndView("/loginSuccess");

}

 

注意, 其中表单中的name字段需要和POJO的属性字段一致

 

 

3、直接通过HttpServletRequest获取

@RequestMapping(value="/addPerson", method = RequestMethod.POST)

public ModelAndView addPerson(HttpServletRequest request, HttpServletResponse response){

    String name = request.getParameter("name");

    return new ModelAndView("/addSuccess");

}

 

4、用注解@RequestParam绑定请求参数

当请求参数不存在时会有异常发生,可以通过设置属性required=false解决

@RequestMapping(value="/getPerson", method = RequestMethod.GET)

public ModelAndView getPerson(@RequestParam("name") String name){

    System.out.println(name);

    return new ModelAndView("/addSuccess");

}