SpringMvc(3)--REST
欧阳俊逸
1.REST简介
关于rest可以看 http://blog.csdn.net/wjh156304366/article/category/1145134
2.模拟REST风格的增删查改
UserController.java
package org.sh.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.validation.Valid;
import org.sh.vo.User;
import org.sh.vo.UserException;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Controller
@RequestMapping("/user")
@SessionAttributes("loginUser")
public class UserController {
private static Map<String, User> users = new HashMap<String, User>();
public UserController() {
users.put("suhao1", new User("suhao1", "苏浩", "123", "123"));
users.put("suhao2", new User("suhao2", "苏浩", "123", "123"));
users.put("suhao3", new User("suhao3", "苏浩", "123", "123"));
users.put("suhao4", new User("suhao4", "苏浩", "123", "123"));
}
@RequestMapping("/users")
public String list(Model model) {
model.addAttribute("users", users);
return "user/list";
}
// 当以get提交的时候就调用此方法
@RequestMapping(value = "/add", method = RequestMethod.GET)
public String add(Model model) {
model.addAttribute("user",new User());//防止添加的时候页面报错
return "user/add";
}
// 当以post提价的时候就调用此方法,参数中的user和form中的ModelAttribute的属性要保持一样
@RequestMapping(value = "/add", method = RequestMethod.POST)
public String add(@Valid User user,BindingResult binding) {
if(binding.hasErrors()){
System.out.println("=========BindingResult============");
return "user/add";
}
users.put(user.getUsername(), user);
//加上前缀 使用客户端跳转 防止重复提交
return InternalResourceViewResolver.REDIRECT_URL_PREFIX+"/user/users";
}
@RequestMapping(value="/{username}",method=RequestMethod.GET)
public String show(@PathVariable String username,Model model){
System.out.println("***************"+username);
model.addAttribute("user",users.get(username));
return "user/show";
}
@RequestMapping(value="/{username}/update",method=RequestMethod.GET)
public String update(@PathVariable String username,Model model){
model.addAttribute("user",users.get(username));
return "user/update";
}
@RequestMapping(value="/{username}/update",method=RequestMethod.POST)
public String update(@PathVariable String username,@Valid User user,BindingResult br,Model model){
if(br.hasErrors()){
return "user/update";
}
users.put(username, user);
return "redirect:/user/users";
}
@RequestMapping(value="/{username}/delete",method=RequestMethod.GET)//tomcat不能发delete请求
public String delete(@PathVariable String username){
users.remove(username);
return "redirect:/user/users";
}
@RequestMapping(value = "/login",method=RequestMethod.GET)
public String login(){
return "user/login";
}
@RequestMapping(value = "/login",method=RequestMethod.POST)
public String login(String username,String password,Model model){
if(!users.containsKey(username)){
throw new UserException("用户名不存在");
}
if(!password.equals(users.get(username).getPassword())){
throw new UserException("密码不正确");
}
model.addAttribute("loginUser",users.get(username));//loginUser 和sessionAttribute的名字一样
return "redirect:/user/users";
}
@ExceptionHandler(value={UserException.class})
public String handleException(Exception ex,HttpServletRequest req){
req.setAttribute("ex", ex);
return "error";
}
@RequestMapping("/redir")
public String redir(RedirectAttributes ra) {
ra.addFlashAttribute("tttt", "tttt");
return "redirect:/user/users";
}
}
在WEB-INF/jsp/user 创建出所需要的jsp页面
1.list.jsp
<body>
<h1>${tttt }</h1>
<a href="add"> add</a>-->${loginUser.nickname }<br/>
<c:forEach items="${users}" var="user">
<a href="${user.value.username }">${user.value.username }</a>----${user.value.nickname }---${user.value.password }---${user.value.email }
<a href="${user.value.username }/update">更新</a>
<a href="${user.value.username }/delete">删除</a><br/>
</c:forEach>
</body>
2.add.jsp
<body>
<sf:form method="post" modelAttribute="user">
UserName:<sf:input path="username"/><sf:errors path="username"/><br/>
Password:<sf:password path="password"/><sf:errors path="password"/><br/>
Nickname:<sf:input path="nickname"/><sf:errors path="nickname"/><br/>
Email: <sf:input path="email"/><sf:errors path="email"/><br/>
<input type="submit"/>
</sf:form>
</body>
3.show.jsp
<body>
${user.username }----${user.password }----${user.nickname }----${user.email }
</body>
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