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springMVC获取传递的参数

2015-06-23 22:38 645 查看
页面定义如下：

<html>
<body>
<form action="spring/cpf.do">
<input type="text" name="username">
<input type="text" name="password">
<input type="submit" value="submit">
</form>
</body>
</html>


1.通过HttpServletRequest

@Controller
@RequestMapping("/spring")
public class HelloWorldController
{
//表示对应的路径是/cpf.do
@RequestMapping(value="/cpf.do")
public String say(HttpServletRequest request, HttpServletResponse response)
{
String name = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(name);
System.out.println(password);

return "cpf";
}
}
这种方式和Servlet完全一样，从Request中直接获得即可

2.通过和参数名相同的入参

@RequestMapping(value="/cpf.do")
public String say( String username,
String password, Model model)
{
<span style="white-space:pre">	</span>System.out.println(name);
System.out.println(password);

return "cpf";
}


3.通过别名，并指定默认值

@RequestMapping(value="/cpf.do")
public String say(@RequestParam(value="username",defaultValue="tom") String name,
@RequestParam(value="password",defaultValue="123")String password, Model model)
{
<span style="white-space:pre">	</span>System.out.println(name);
System.out.println(password);
model.addAttribute("hello", name);

return "cpf";
}


4.通过对象（最常用）

页面定义如下：

<html>
<body>
<h2>${hello}</h2>
<form action="cpf.do">
<input type="text" name="username"><br/>
<input type="text" name="password"><br/>
<input type="checkbox" name="hobby" value="dota"> dota
<input type="checkbox" name="hobby" value="travel"> travle<br/>
<input type="submit" value="submit">
</form>
</body>
</html>


定义对应的对象：

public class User {
private String username;
private String password;
private String[] hobby;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String[] getHobby() {
return hobby;
}
public void setHobby(String[] hobby) {
this.hobby = hobby;
}
}
Controller：

@Controller
public class HelloWorldController
{
@RequestMapping(value="/cpf.do")
public String say(User user)
{
System.out.println("username:"+user.getUsername());
System.out.println("password:"+user.getPassword());
System.out.print("hobby contains:");
for (String s : user.getHobby()) {
System.out.print(s+" ");
}

return "cpf";
}
}
结果为：



注意：复选框使用String[]来存储所有的值

5.参数类型转换

有时我们需要进行类型转换。如页面需要传入生日，但是传入的是字符串形式，而我们的Controller需要接收Date类型的数据，这个时候，就可以使用类型转化器了

@Controller
public class HelloWorldController
{
@InitBinder
public void initBinder(ServletRequestDataBinder bin)
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
CustomDateEditor dateEditor = new CustomDateEditor(sdf, true);

bin.registerCustomEditor(Date.class, dateEditor);
}

@RequestMapping(value="/cpf.do")
public String say(Date birthday)
{
System.out.println("birthday:"+birthday);

return "cpf";
}
}
页面为：

<html>
<body>
<h2>${hello}</h2>
<form action="cpf.do">
<input type="text" name="birthday"><br/>
<input type="submit" value="submit">
</form>
</body>
</html>
输入：



结果为：

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