springboot 中如何使用拦截器，Javaweb 资料视频
/**
在整个请求结束之后被调用，也就是在 DispatcherServlet 渲染了对应的视图之后执行
（主要是用于进行资源清理工作）
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
Object object, Exception ex)
throws Exception {
// TODO Auto-generated method stub
}
public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result)
throws IOException, UnsupportedEncodingException {
OutputStream out=null;
try{
response.setCharact
erEncoding("utf-8");
response.setContentType("text/json");
out = response.getOutputStream();
out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
out.flush();
} finally{
if(out!=null){
out.close();
}
}
}
}
package com.imooc.controller.interceptor;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.imooc.pojo.IMoocJSONResult;
import com.imooc.utils.JsonUtils;
public class TwoInterceptor implements HandlerInterceptor {
final static Logger log = LoggerFactory.getLogger(TwoInterceptor.class);
/**
在请求处理之前进行调用（Controller 方法调用之前）
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception {
if (true) {
returnErrorResponse(response, IMoocJSONResult.errorMsg("被 two 拦截..."));
}
System.out.println("被 two 拦截...");
return false;
}
/**
请求处理之后进行调用，但是在视图被渲染之前（Controller 方法调用之后）
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv)
throws Exception {
// TODO Auto-generated method stub
}
/**
在整个请求结束之后被调用，也就是在 DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex)
throws Exception {
// TODO Auto-generated method stub
}
public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result) throws IOException, UnsupportedEncodingException {
OutputStream out=null;
try{
response.setCharacterEncoding("utf-8");
response.setContentType("text/json");
out = response.getOutputStream();
out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));
out.flush();
} finally{
if(out!=null){
out.close();
}
}
}
}
Controller
package com.imooc.controller.interceptor;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import com.imooc.pojo.User;
@Controller
@RequestMapping("one")
public class OneController {
@RequestMapping("/index")
public String index(ModelMap map) {
map.addAttribute("name", "imooc22");
return "thymeleaf/index";
}
@RequestMapping("center")
public String center() {
return "thymeleaf/center/center";
}
@RequestMapping("test")
public String test(ModelMap map) {
User user = new User();
user.setAge(18);
user.setName("manager");
user.setPassword("123456");
user.setBirthday(new Date());
map.addAttribute("user", user);
User u1 = new User();
u1.setAge(19);
u1.setName("imooc");
u1.setPassword("123456");
u1.setBirthday(new Date());
User u2 = new User();
u2.setAge(17);
u2.setName("LeeCX");
u2.setPassword("123456");
u2.setBirthday(new Date());
List<User> userList = new ArrayList<>();
userList.add(user);
userList.add(u1);
userList.add(u2);
map.addAttribute("userList", userList);
return "thymeleaf/test";
}
@PostMapping("postform")
public String postform(User user) {
System.out.println(user.getName());
return "redirect:/th/test";
}
}
package com.imooc.controller.interceptor;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import com.imooc.pojo.User;
@Controller
@RequestMapping("two")
public class TwoController {
@RequestMapping("/index")
public String index(ModelMap map) {
map.addAttribute("name", "itzixi22");
return "thymeleaf/index";
}
@RequestMapping("center")
public String center() {
return "thymeleaf/center/center";
}
@RequestMapping("test")
public String test(ModelMap map) {
User user = new User();
user.setAge(18);
user.setName("manager");
user.setPassword("123456");
user.setBirthday(new Date());
map.addAttribute("user", user);
User u1 = new User();
u1.setAge(19);
u1.setName("itzixi");
u1.setPassword("123456");
u1.setBirthday(new Date());
User u2 = new User();
u2.setAge(17);
u2.setName("LeeCX");
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