Spring MVC的参数装配
自动装配
零散数据的装配
装配原则:传递参数名和方法接收参数名一致
表单
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/threeController/myform" method="post">
账号:<input type="text" name="uname"><br>
密码:<input type="password" name="upwd">
<input type="submit" value="提交">
</form>
</body>
</html>
目标页面
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>欢迎</title>
</head>
<body>
欢迎， ${userCode}
</body>
</html>
控制器
@Controller
@RequestMapping("/threeController")
public class threeController {
@RequestMapping("/myform")
public ModelAndView myform(String uname, String upwd){
ModelAndView mv=new ModelAndView();
System.out.println(uname);
System.out.println(upwd);
mv.addObject("userCode",uname);
mv.setViewName("myform");
return mv;
}
}
手动装配
手动装配@RequestParam name代表页面发送的参数名字
required代表参数是否必须传递 false代表可以不传递，默认为true defaultValue代表默认
model代表给页面传递的数据
@RequestMapping("/myform")
public ModelAndView myform(@RequestParam(name="uname",required=false,defaultValue="梅川酷子")String uname,
@RequestParam(name="upwd",required=false,defaultValue="admin")String upwd){
ModelAndView mv=new ModelAndView();
System.out.println(uname);
System.out.println(upwd);
mv.addObject("userCode",uname);
mv.setViewName("myform");
return mv;
}
restful风格
get请求时，如果需要传递数据，那么则不能使用以往方式？name=xxx&age=yy
但是现在要遵循restful风格，举例 xxx/yyy/zzz
根据地址栏URL匹配拿值 使用@PathVariable(name=地址栏中的参数映射)
说白了就是:除了 / 以外的符号不能出现
@RequestMapping(value = "/myform2/{uname}/{upwd}")
public ModelAndView myform2(@PathVariable(name="uname")String uname, @PathVariable(name="upwd")String upwd){
ModelAndView mv=new ModelAndView();
System.out.println(uname);
System.out.println(upwd);
mv.addObject("userCode",uname);
mv.setViewName("myform");
return mv;
}
对象参数：
传递的对象参数和对象中的属性名保持一致
public class UserInfo implements Serializable {
private Integer user_id;
private String user_name;
/**
* 注入域属性
* @return
*/
private List<Teacher> teaList;
private Teacher teacher;
/*public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}*/
public Integer getUser_id() {
return user_id;
}
public void setUser_id(Integer user_id) {
this.user_id = user_id;
}
public String getUser_name() {
return user_name;
}
public void setUser_name(String user_name) {
this.user_name = user_name;
}
public List<Teacher> getTeaList() {
return teaList;
}
public void setTeaList(List<Teacher> teaList) {
this.teaList = teaList;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
@Override
public String toString() {
return "UserInfo{" +
"user_id=" + user_id +
", user_name='" + user_name + '\'' +
", teaList=" + teaList +
", teacher=" + teacher +
'}';
}
}
页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/threeController/myform3" method="post">
账号:<input type="text" name="uname"><br>
密码:<input type="password" name="upwd"><br>
info.name:<input type="text" name="user_name"/><br>
info.id:<input type="text" name="user_id"/><br>
<input type="submit" value="提交">
</form>
</body>
</html>
目标页面
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>欢迎</title>
</head>
<body>
欢迎， ${userCode}
</body>
</html>
控制器
@RequestMapping(value = "/myform3")
public ModelAndView myform3(UserInfo info){
ModelAndView mv=new ModelAndView();
System.out.println(info.toString());
mv.addObject("userCode",info.getUser_name());
mv.setViewName("myform");
return mv;
}
域属性
域属性传递：传递参数为：域属性.属性名
页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/threeController/myform4" method="post">
账号:<input type="text" name="uname"><br>
密码:<input type="password" name="upwd"><br>
info.name:<input type="text" name="Teacher.teacher_name"/><br>
info.id:<input type="text" name="Teacher.teacher_id"/><br>
<input type="submit" value="提交">
</form>
</body>
</html>
集合参数传递
集合参数传递：集合名[下标].属性名
页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/threeController/myform5" method="post">
账号:<input type="text" name="uname"><br>
密码:<input type="password" name="upwd"><br>
info.name:<input type="text" name="teaList[0].teacher_name"/><br>
info.id:<input type="text" name="teaList[1].teacher_id"/><br>
<input type="submit" value="提交">
</form>
</body>
</html>
