Spring3 MVC请求参数获取的几种方法
Spring3 MVC请求参数获取的几种方法
一、通过@PathVariabl获取路径中的参数
@RequestMapping(value="user/{id}/{name}",method=RequestMethod.GET)
public String test (@PathVariable String id,@PathVariable String name, ModelMap model) {
System.out.println(id);
System.out.println(name);
model.addAttribute("message", "111111");
return "users";
}
二、@ModelAttribute获取POST请求的FORM表单数据
JSP表单如下
<form method="post" action="hao.do">
a: <input id="a" type="text" name="a"/>
b: <input id="b" type="text" name="b"/>
<input type="submit" value="Submit" />
</form>
JavaBean如下
public class Pojo{
private String a;
private int b;
}
Java Controller如下
@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) {
return "helloWorld";
}
三、直接用HttpServletRequest获取
@RequestMapping(method = RequestMethod.GET)
public String get(HttpServletRequest request, HttpServletResponse response) {
System.out.println(request.getParameter("a"));
return "helloWorld";
}
四、用注解@RequestParam绑定请求参数
用注解@RequestParam绑定请求参数a到变量a
当请求参数a不存在时会有异常发生,可以通过设置属性required=false解决,
例如: @RequestParam(value="a", required=false)
Controller如下
@RequestMapping(value = "/requestParam", method = RequestMethod.GET)
public String setupForm(@RequestParam("a") String a, ModelMap model) {
System.out.println(a);
return "helloWorld";
}
摘自leiOOlei博客http://www.cnblogs.com/leiOOlei/p/3658147.html
自己使用体会
1. 当表单和JavaBean不一一对应时候，使用注解@RequestParam绑定请求参数，
如果参数名和前台的一样可简写
JSP页面代码：
<form action="login/check" method="post">
<h2>欢迎你</h2>
<label>帐号</label>
<input type="text" id="username" name="username" class="username">
</br>
<label>密码</label>
<input type="password" id="password" name="password" class="password">
</br>
<input name="login" type="submit" value="登录"/>
</form>
Controller代码：
@RequestMapping(value="check",method=RequestMethod.POST)
public ModelAndView check (HttpServletRequest request, String username,String password) {
//养成转码的好习惯
username = new String(username.getBytes("iso8859-1"),"UTF-8");
System.out.println("----------->"+username);
System.out.println("----------->"+password);
return new ModelAndView("/welcome");
}
2. 当表单和JavaBean一一对应时候，使用@ModelAttribute获取POST请求的FORM表单数据
JSP页面代码：
<form action="login/check" method="post">
<h2>欢迎你</h2>
<label>帐号</label>
<input type="text" id="username" name="username" class="username">
</br>
<label>密码</label>
<input type="password" id="password" name="password" class="password">
</br>
<input name="login" type="submit" value="登录"/>
</form>
Controller代码：
@RequestMapping(value="check",method=RequestMethod.POST)
public ModelAndView check(HttpServletRequest request, User user) {
System.out.println("----------->"+user.getUsername());
System.out.println("----------->"+user.getPassword());
return new ModelAndView("/welcome");
}
JavaBean代码：
public class User {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
}