@RequestParam 绑定单个请求
RequestMapping(value = "/form2")
@ResponseBody
public String form2(@RequestParam String name){
logger.info("name=" + name );
return "";
}
@RequestParam
有required(是否必填),defaultValue(默认参数)参数
默认required=true,defaultValue为空
如果name参数不存在则返回400
使用下面这种写法则required默认为false
@RequestMapping(value = "/form")
@ResponseBody
public String form(String name, Integer age) {
logger.info("name=" + name + "," + "age=" + age);
return "";
}
@RequestParam
还支持数组形式
@RequestMapping(value = "/names")
@ResponseBody
public String names(@RequestParam String[] name) {
logger.info("name=" + Arrays.asList(name));
return Arrays.asList(name).toString();
}
对应请求/names.do?name=张三,李四
或者/names.do?name=张三&name=李四
@PathVariable 绑定uri变量值
@RequestMapping("/user/{id}")
@ResponseBody
public String getUser(@PathVariable Long id) {
return String.valueOf(id);
}
请求/user/1返回id为1
@CookieValue 绑定cookie的值
@RequestMapping("/getCookie")
@ResponseBody
public String getCookie(@CookieValue("JSESSIONID") String sessionId) {
return sessionId;
}
@ModelAttribute绑定参数到命令对象
- 绑定请求参数到对象
先定义两个对象
Role
public class Role implements Serializable {
private String id;
}
User
public class User implements Serializable {
private String id;
private Role role;
}
@RequestMapping("/getUserByModel")
@ResponseBody
public String getUserByModel(@ModelAttribute("user") User user) {
logger.info(user.toString());
return "";
}
对应请求/getUserByModel.do?id=123&role.id=1
- 暴露表单引用对象为模型数据
@ModelAttribute("user")
public User getUser(String userId) {
User user = new User();
user.setId("11");
Role role=new Role();
role.setId("123");
user.setRole(role);
return user;
}
@RequestMapping("/getUserModel")
@ResponseBody
public String getUserModel(@ModelAttribute User user) {
return user.toString();
}
请求/getUserModel?id=1
返回 User{id='1', role=Role{id='123'}}
使用@ModelAttribute
注释的方法会在所有Controller方法前运行
因为先运行了@ModelAttribute
注解的方法,生成了一个user对象,之后user对象的id属性被修改为1
@SessionAttributes绑定命令对象到session
springmvc提供了@SessionAttributes
用来对会话数据的存取
添加session
@RequestMapping("/setSession")
@ResponseBody
public String setSession(
HttpSession session) {
City city = new City();
city.setCityName("shanghai");
session.setAttribute("city", city);
return city.toString();
}
获取session数据
//在类头部添加需要的session属性
@Controller
@SessionAttributes(value = {"city"})
public class TestController {
@RequestMapping("/getSession")
@ResponseBody
public String getSession(@ModelAttribute City city) {
return city.toString();
}
}
清除本次会话session
@RequestMapping("/clearSession")
@ResponseBody
public String clearSession(SessionStatus status) {
status.setComplete();
return "success";
}
@RequestBody绑定请求的内容区数据并能进行自动类型转换等
使用RequestBody可以将json转化为对象
@RequestMapping("/getUserByJson")
@ResponseBody
public String getUserByJson(@RequestBody User user){
return user.toString();
}
发送json格式报文
{
"id":"123"
}
返回结果User{id='123', role=null}
@RequestPart绑定“multipart/data”数据
@RequestMapping("/getFile")
@ResponseBody
public String getFile(@RequestPart("image") MultipartFile file){
System.out.println(file.getName()+","+file.getSize());
return "success";
}
源码地址:https://github.com/lialzmChina/javaeeLearn.git
拓展阅读
springmvc 参数绑定源码分析
springmvc 自定义参数转换器