spring mvc高级技术实例详解

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>

 <context-param>
 <param-name>contextConfigLocation</param-name>
 <param-value>classpath:spring-*.xml</param-value>
 </context-param>
 <listener>
 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 
 <servlet>
 <servlet-name>appServlet</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:springMvc.xml</param-value>
 </init-param>
 </servlet>
 <servlet-mapping>
 <servlet-name>appServlet</servlet-name>
 <url-pattern>/</url-pattern>
 </servlet-mapping>

</web-app>

@Controller
public class HelloController {

 @RequestMapping("/home")
 public String home(){
 System.out.println("执行home");
 throw new MyException();
// return "home"; //返回一个字符串，即逻辑视图名
 }
}

package com.cn.Exception;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;
public class MyException extends RuntimeException{

}

package com.cn.Exception;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "抛出异常的原因")
public class MyException extends RuntimeException{

}

package com.cn.Exception;

public class MyException2 extends RuntimeException{

}

@Controller
public class HelloController {

 @RequestMapping("/home")
 public String home(){
 System.out.println("执行home");
 throw new MyException2();
// return "home"; //返回一个字符串，即逻辑视图名
 }

 @ExceptionHandler(MyException2.class)
 public String handleMException(){
 System.out.println("处理异常逻辑");
 return "fail";
 }
}

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ExceptionHandler {
 Class<? extends Throwable>[] value() default {};
}

package com.cn.advice;

import com.cn.Exception.MyException2;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice 
public class HandleException {

 @ExceptionHandler(MyException2.class)
 public String handleMException(){
  System.out.println("处理异常逻辑");
  return "fail";
 }
}

@Controller
public class HelloController {

 @RequestMapping("/home2")
 public String home2(Model model){
  model.addAttribute("id","12324131343256");
  model.addAttribute("name","pick");
  return "redirect:home3/{id}"; //含有redirect的字符串，表示重定向到另一个处理器；
         //如果含有forward的字符串，表示转向到另一个处理器
 }

 @RequestMapping("/home3/{id}")
 public String home3(@PathVariable String id, Model model){
  System.out.println("传递的ID="+id);
  model.addAttribute(new User());
  return "home";
 }
}

@Controller
public class HelloController {

 @RequestMapping("/home2")
 public String home2(RedirectAttributes model){
  model.addAttribute("id","12324131343256");
  model.addFlashAttribute("user",new User("liming","123456"));//设置flash属性，也可以 model.addFlashAttribute(new User("liming","123456")) 
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 //则通过值得类型自行推断出key为user
  return "redirect:home3/{id}";
 }

 @RequestMapping("/home3/{id}")
 public String home3(@PathVariable String id, RedirectAttributes model){
  System.out.println("传递的ID="+id);
  if (model.containsAttribute("user")) {
   System.out.println("传递的对象：" + model.getFlashAttributes().get("user"));
  }
  return "home";
 }
}