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" ;

  }

}