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基于springMVC 3.0项目开发实例

2014-05-26

1 项目包结构如下: 2 spring配置文件springMVC xml修改如下: 3 spring配置文件beans xml内容修改如下

1.项目包结构如下:

\

\

\

2. spring配置文件springMVC.xml修改如下:


xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">











jsp/">


3. spring配置文件beans.xml内容修改如下:


xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">







mysql.jdbc.Driver">













classpath:com/sxt/domain/



org.hibernate.dialect.MySQLInnoDBDialect
true
update
























4. web.xml文件不变


xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">



contextConfigLocation
classpath:beans.xml


org.springframework.web.context.ContextLoaderListener



action
org.springframework.web.servlet.DispatcherServlet

contextConfigLocation
classpath:springMVC.xml



action
/


index.jsp


5. 类的代码不变。

6. 运行,测试。跟上一个项目保持一致。

Spring MVC 3.0 深入

核心原理

1. 用户发送请求给服务器。url:user.do

2. 服务器收到请求。发现DispatchServlet可以处理。于是调用DispatchServlet。

3. DispatchServlet内部,通过HandleMapping检查这个url有没有对应的Controller。如果有,则调用Controller。

4. Controller开始执行。

5. Controller执行完毕后,如果返回字符串,则ViewResolver将字符串转化成相应的视图对象;如果返回ModelAndView对象,该对象本身就包含了视图对象信息。

6. DispatchServlet将执视图对象中的数据,输出给服务器。

7. 服务器将数据输出给客户端。

spring3.0中相关jar包的含义

org.springframework.aop-3.0.3.RELEASE.jar

spring的aop面向切面编程

org.springframework.asm-3.0.3.RELEASE.jar

spring独立的asm字节码生成程序

org.springframework.beans-3.0.3.RELEASE.jar

IOC的基础实现

org.springframework.context-3.0.3.RELEASE.jar

IOC基础上的扩展服务

org.springframework.core-3.0.3.RELEASE.jar

spring的核心包

org.springframework.expression-3.0.3.RELEASE.jar

spring的表达式语言

org.springframework.web-3.0.3.RELEASE.jar

web工具包

org.springframework.web.servlet-3.0.3.RELEASE.jar

mvc工具包

@Controller控制器定义

和Struts1一样,Spring的Controller是Singleton的。这就意味着会被多个请求线程共享。因此,我们将控制器设计成无状态类。

在spring 3.0中,通过@controller标注即可将class定义为一个controller类。为使spring能找到定义为controller的bean,需要在spring-context配置文件中增加如下定义:

"com.sxt.web"/>

注:实际上,使用@component,也可以起到@Controller同样的作用。

@RequestMapping

在类前面定义,则将url和类绑定。

在方法前面定义,则将url和类的方法绑定,如下所示:

package com.sxt.web;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import com.sxt.service.UserService;

@Controller

@RequestMapping("/user.do")

publicclass UserController {

@Resource

private UserServiceuserService;

//http://localhost:8080/springmvc02/user.do?method=reg&uname=zzzz

@RequestMapping(params="method=reg")

public String reg(String uname) {

System.out.println("HelloController.handleRequest()");

userService.add(uname);

return"index";

}

public UserService getUserService() {

returnuserService;

}

publicvoid setUserService(UserService userService) {

this.userService = userService;

}

}

@RequestParam

一般用于将指定的请求参数付给方法中形参。示例代码如下:

@RequestMapping(params="method=reg5")

public String reg5(@RequestParam("name")String uname,ModelMap map) {

System.out.println("HelloController.handleRequest()");

System.out.println(uname);

//通过ModelMap传参

map.put("name", uname);

return"index";

}

这样,就会将name参数的值付给uname。当然,如果请求参数名称和形参名称保持一致,则不需要这种写法。

@SessionAttributes

将ModelMap中指定的属性放到session中。示例代码如下:

@Controller

@RequestMapping("/user.do")

@SessionAttributes({"u","a"}) //将ModelMap中属性名字为u、a的再放入session中。这样,request和session中都有了。

publicclass UserController {

@RequestMapping(params="method=reg4")

public String reg4(ModelMap map) { System.out.println("HelloController.handleRequest()");

map.addAttribute("u","uuuu"); //将u放入request作用域中,这样转发页面也可以取到这个数据。

return"index";

}

}

**********${requestScope.u.uname}

**********${sessionScope.u.uname}

注:名字为”user”的属性再结合使用注解@SessionAttributes可能会报错。

@ModelAttribute

这个注解可以跟@SessionAttributes配合在一起用。可以将ModelMap中属性的值通过该注解自动赋给指定变量。

示例代码如下:

package com.sxt.web;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.SessionAttributes;

@Controller

@RequestMapping("/user.do")

@SessionAttributes({"u","a"})

publicclass UserController {

@RequestMapping(params="method=reg4")

public String reg4(ModelMap map) {

System.out.println("HelloController.handleRequest()");

map.addAttribute("u","尚学堂高淇");

return"index";

}

@RequestMapping(params="method=reg5")

public String reg5(@ModelAttribute("u")String uname ,ModelMap map) {

System.out.println("HelloController.handleRequest()");

System.out.println(uname);

return"index";

}

}

先调用reg4方法,再调用reg5方法。我们发现控制台打印出来:尚学堂高淇

Controller类中方法参数的处理

Controller类中方法返回值的处理

1. 返回string(建议)

a) 根据返回值找对应的显示页面。路径规则为:prefix前缀+返回值+suffix后缀组成

b) 代码如下:

@RequestMapping(params="method=reg4")

public String reg4(ModelMap map) {

System.out.println("HelloController.handleRequest()");

return"index";

}

前缀为:/WEB-INF/jsp/ 后缀是:.jsp

在转发到:/WEB-INF/jsp/index.jsp

2. 也可以返回ModelMap、ModelAndView、map、List、Set、Object、无返回值。一般建议返回字符串!

请求转发和重定向

代码示例:

package com.sxt.web;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.SessionAttributes;

@Controller

@RequestMapping("/user.do")

publicclass UserController {

@RequestMapping(params="method=reg4")

public String reg4(ModelMap map) {

System.out.println("HelloController.handleRequest()");

// return "forward:index.jsp";

// return "forward:user.do?method=reg5"; //转发

// return "redirect:user.do?method=reg5"; //重定向

return"redirect:http://www.baidu.com"; //重定向

}

@RequestMapping(params="method=reg5")

public String reg5(String uname,ModelMap map) {

System.out.println("HelloController.handleRequest()");

System.out.println(uname);

return"index";

}

}

访问reg4方法,既可以看到效果。

获得request对象、session对象

普通的Controller类,示例代码如下:

@Controller

@RequestMapping("/user.do")

publicclass UserController {

@RequestMapping(params="method=reg2")

public String reg2(String uname,HttpServletRequest req,ModelMap map){

req.setAttribute("a","aa");

req.getSession().setAttribute("b","bb");

return"index";

}

}

ModelMap

是map的实现,可以在其中存放属性,作用域同request。下面这个示例,我们可以在modelMap中放入数据,然后在forward的页面上显示这些数据。通过el表达式、JSTL、java代码均可。代码如下:

package com.sxt.web;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

@Controller

@RequestMapping("/user.do")

publicclass UserControllerextends MultiActionController {

@RequestMapping(params="method=reg")

public String reg(String uname,ModelMap map){

map.put("a","aaa");

return"index";

}

}

<%@ page language="java"import="java.util.*"pageEncoding="utf-8"%>

<%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%>

${requestScope.a}

ModelAndView模型视图类

见名知意,从名字上我们可以知道ModelAndView中的Model代表模型,View代表视图。即,这个类把要显示的数据存储到了Model属性中,要跳转的视图信息存储到了view属性。我们看一下ModelAndView的部分源码,即可知其中关系:

publicclassModelAndView {

/** View instance or view name String */

private Objectview;

/** Model Map */

private ModelMapmodel;

/**

* Indicates whether or not this instance has been cleared with a call to{@link #clear()}.

*/

privatebooleancleared =false;

/**

* Default constructor for bean-style usage: populating bean

* properties instead of passing in constructor arguments.

* @see #setView(View)

* @see #setViewName(String)

*/

public ModelAndView() {

}

/**

* Convenient constructor when there is no model data to expose.

* Can also be used in conjunction withaddObject.

* @param viewName name of the View to render, to be resolved

* by the DispatcherServlet's ViewResolver

* @see #addObject

*/

public ModelAndView(String viewName) {

this.view = viewName;

}

/**

* Convenient constructor when there is no model data to expose.

* Can also be used in conjunction withaddObject.

* @param view View object to render

* @see #addObject

*/

public ModelAndView(View view) {

this.view = view;

}

/**

* Creates new ModelAndView given a view name and a model.

* @param viewName name of the View to render, to be resolved

* by the DispatcherServlet's ViewResolver

* @param model Map of model names (Strings) to model objects

* (Objects). Model entries may not benull, but the

* model Map may be null if there is no model data.

*/

public ModelAndView(String viewName, Map model) {

this.view = viewName;

if (model !=null) {

getModelMap().addAllAttributes(model);

}

}

/**

* Creates new ModelAndView given a View object and a model.

* Note: the supplied model data is copied into the internal

* storage of this class. You should not consider to modify the supplied

* Map after supplying it to this class

* @param view View object to render

* @param model Map of model names (Strings) to model objects

* (Objects). Model entries may not benull, but the

* model Map may be null if there is no model data.

*/

public ModelAndView(View view, Map model) {

this.view = view;

if (model !=null) {

getModelMap().addAllAttributes(model);

}

}

/**

* Convenient constructor to take a single model object.

* @param viewName name of the View to render, to be resolved

* by the DispatcherServlet's ViewResolver

* @param modelName name of the single entry in the model

* @param modelObject the single model object

*/

public ModelAndView(String viewName, String modelName, Object modelObject) {

this.view = viewName;

addObject(modelName, modelObject);

}

/**

* Convenient constructor to take a single model object.

* @param view View object to render

* @param modelName name of the single entry in the model

* @param modelObject the single model object

*/

public ModelAndView(View view, String modelName, Object modelObject) {

this.view = view;

addObject(modelName, modelObject);

}

/**

* Set a view name for this ModelAndView, to be resolved by the

* DispatcherServlet via a ViewResolver. Will override any

* pre-existing view name or View.

*/

publicvoid setViewName(String viewName) {

this.view = viewName;

}

/**

* Return the view name to be resolved by the DispatcherServlet

* via a ViewResolver, or null if we are using a View object.

*/

public String getViewName() {

return (this.viewinstanceof String ? (String) this.view :null);

}

/**

* Set a View object for this ModelAndView. Will override any

* pre-existing view name or View.

*/

publicvoid setView(View view) {

this.view = view;

}

/**

* Return the View object, ornull if we are using a view name

* to be resolved by the DispatcherServlet via a ViewResolver.

*/

public View getView() {

return (this.viewinstanceof View ? (View) this.view :null);

}

/**

* Indicate whether or not thisModelAndView has a view, either

* as a view name or as a direct{@link View} instance.

*/

publicboolean hasView() {

return (this.view != null);

}

/**

* Return whether we use a view reference, i.e.true

* if the view has been specified via a name to be resolved by the

* DispatcherServlet via a ViewResolver.

*/

publicboolean isReference() {

return (this.viewinstanceof String);

}

/**

* Return the model map. May returnnull.

* Called by DispatcherServlet for evaluation of the model.

*/

protected Map getModelInternal() {

returnthis.model;

}

/**

* Return the underlying ModelMap instance (nevernull).

*/

public ModelMap getModelMap() {

if (this.model == null) {

this.model =new ModelMap();

}

returnthis.model;

}

/**

* Return the model map. Never returnsnull.

* To be called by application code for modifying the model.

*/

public Map getModel() {

return getModelMap();

}

/**

* Add an attribute to the model.

* @param attributeName name of the object to add to the model

* @param attributeValue object to add to the model (nevernull)

* @see ModelMap#addAttribute(String, Object)

* @see #getModelMap()

*/

publicModelAndView addObject(String attributeName, Object attributeValue) {

getModelMap().addAttribute(attributeName, attributeValue);

returnthis;

}

/**

* Add an attribute to the model using parameter name generation.

* @param attributeValue the object to add to the model (nevernull)

* @see ModelMap#addAttribute(Object)

* @see #getModelMap()

*/

publicModelAndView addObject(Object attributeValue) {

getModelMap().addAttribute(attributeValue);

returnthis;

}

/**

* Add all attributes contained in the provided Map to the model.

* @param modelMap a Map of attributeName-> attributeValue pairs

* @see ModelMap#addAllAttributes(Map)

* @see #getModelMap()

*/

publicModelAndView addAllObjects(Map modelMap) {

getModelMap().addAllAttributes(modelMap);

returnthis;

}

/**

* Clear the state of this ModelAndView object.

* The object will be empty afterwards.

*

Can be used to suppress rendering of a given ModelAndView object

* in the postHandle method of a HandlerInterceptor.

* @see #isEmpty()

* @see HandlerInterceptor#postHandle

*/

publicvoid clear() {

this.view =null;

this.model =null;

this.cleared =true;

}

/**

* Return whether this ModelAndView object is empty,

* i.e. whether it does not hold any view and does not contain a model.

*/

publicboolean isEmpty() {

return (this.view == null && CollectionUtils.isEmpty(this.model));

}

/**

* Return whether this ModelAndView object is empty as a result of a call to{@link #clear}

* i.e. whether it does not hold any view and does not contain a model.

*

Returns false if any additional state was added to the instance

* after the call to{@link #clear}.

* @see #clear()

*/

publicboolean wasCleared() {

return (this.cleared && isEmpty());

}

/**

* Return diagnostic information about this model and view.

*/

@Override

public String toString() {

StringBuilder sb = new StringBuilder("ModelAndView: ");

if (isReference()) {

sb.append("reference to view with name '").append(this.view).append("'");

}

else {

sb.append("materialized View is [").append(this.view).append(']');

}

sb.append("; model is ").append(this.model);

return sb.toString();

}

}

测试代码如下:

package com.sxt.web;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

import com.sxt.po.User;

@Controller

@RequestMapping("/user.do")

publicclass UserControllerextends MultiActionController {

@RequestMapping(params="method=reg")

public ModelAndView reg(String uname){

ModelAndView mv = new ModelAndView();

mv.setViewName("index");

// mv.setView(new RedirectView("index"));

User u = new User();

u.setUname("高淇");

mv.addObject(u); //查看源代码,得知,直接放入对象。属性名为”首字母小写的类名”。一般建议手动增加属性名称。

mv.addObject("a","aaaa");

returnmv;

}

}

<%@ page language="java"import="java.util.*"pageEncoding="gbk"%>

<%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%>

${requestScope.a}

${requestScope.user.uname}

地址栏输入:http://localhost:8080/springmvc03/user.do?method=reg

结果为:

基于spring 3.0mvc 框架的文件上传实现

1. spring使用了apache-commons下得上传组件,因此,我们需要引入两个jar包:

1. apache-commons-fileupload.jar

2. apache-commons-io.jar

2. 在springmvc-servlet.xml配置文件中,增加CommonsMultipartResoler配置:

"multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

"defaultEncoding"value="gbk"/>

"maxInMemorySize"value="10240"/>

"uploadTempDir"value="/upload/"/>

"maxUploadSize"value="-1"/>

3. 建立upload.jsp页面,内容如下:

<%@ page language="java"import="java.util.*"pageEncoding="gbk"%>

测试<u>springmvc</u>中上传的实现

"upload.do" method="post"enctype="multipart/form-data">

"text"name="name"/>

"file"name="file"/>

"submit"/>

4. 建立控制器,代码如下:

package com.sxt.web;

import java.io.File;

import java.util.Date;

import javax.servlet.ServletContext;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.context.ServletContextAware;

import org.springframework.web.multipart.commons.CommonsMultipartFile;

@Controller

public class FileUploadController implements ServletContextAware {

private ServletContext servletContext;

@Override

public void setServletContext(ServletContext context) {

this.servletContext = context;

}

@RequestMapping(value="/upload.do", method = RequestMethod.POST)

public String handleUploadData(String name,@RequestParam("file")[微软用户2] CommonsMultipartFile file){

if (!file.isEmpty()) {

String path = this.servletContext.getRealPath("/tmp/"); //获取本地存储路径

System.out.println(path);

String fileName = file.getOriginalFilename();

String fileType = fileName.substring(fileName.lastIndexOf("."));

System.out.println(fileType);

File file2 = new File(path,new Date().getTime() &#43; fileType); //新建一个文件

try {

file.getFileItem().write(file2); //将上传的文件写入新建的文件中

} catch (Exception e) {

e.printStackTrace();

}

return "redirect:upload_ok.jsp";

}else{

return "redirect:upload_error.jsp";

}

}

}

5. 建立upload_ok.jsp页面

<%@ page language="java"import="java.util.*"pageEncoding="gbk"%>

上传成功!

6. 建立upload_error.jsp页面

<%@page language="java"import="java.util.*"pageEncoding="gbk"%>

上传失败!

7. 发布项目,运行测试:http://localhost:8080/springmvc03/upload.jsp

进入项目发布后的目录,发现文件上传成功:

处理ajax请求

spring使用了jackson类库,帮助我们在java对象和json、xml数据之间的互相转换。他可以将控制器返回的对象直接转换成json数据,供客户端使用。客户端也可以传送json数据到服务器进行直接转换。使用步骤如下:

1. 项目中需要引入如下两个jar包:

jackson-core-asl-1.7.2jar

jackson-mapper-asl-1.7.2jar

2. spring配置文件中修改:

"org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

"cacheSeconds"value="0"/>

"messageConverters">

"org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">

3. 客户端代码a.jsp如下:

<%@page language="java"import="java.util.*"pageEncoding="gbk"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()&#43;"://"&#43;request.getServerName()&#43;":"&#43;request.getServerPort()&#43;path&#43;"/";

%>

"<%=basePath%>">

My JSP 'index.jsp' starting page

"pragma"content="no-cache">

"cache-control"content="no-cache">

"expires"content="0">

"keywords"content="keyword1,keyword2,keyword3">

"description"content="This is my page">

<script>

function createAjaxObj(){

var req;

if(window.XMLHttpRequest){

req = new XMLHttpRequest();

}else{

req = new ActiveXObject("Msxml2.XMLHTTP"); //ie

}

return req;

}

function sendAjaxReq(){

var req = createAjaxObj();

req.open("get","myajax.do?method=test2&uname=张三");

req.setRequestHeader("accept","application/json");

req.onreadystatechange =function(){

eval("var result="&#43;req.responseText);

document.getElementById("div1").innerHTML=result[0].uname;

}

req.send(null);

}

</script>

"javascript:void(0);"onclick="sendAjaxReq();">测试

"div1">

4. 服务器端代码如下:

package com.sxt.web;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import com.sxt.po.User;

@Controller

@RequestMapping("myajax.do")

public class MyAjaxController {

@RequestMapping(params="method=test1",method=RequestMethod.GET)

public @ResponseBody List test1(String uname) throws Exception{

String uname2 = new String(uname.getBytes("iso8859-1"),"gbk");

System.out.println(uname2);

System.out.println("MyAjaxController.test1()");

List list = new ArrayList();

list.add(new User("高淇","123"));

list.add(new User("马士兵","456"));

return list;

}

}

5. 测试。

a) 启动服务器。输入:http://localhost:8080/springmvc03/a.jsp

Spring中的拦截器

定义spring拦截器两种基本方式

1. 实现接口:org.springframework.web.servlet.HandlerInterceptor。

接口中有如下方法需要重写:

注意:参数中的Object handler是下一个拦截器。

a) publicboolean preHandle
(HttpServletRequest request,HttpServletResponse response,
Object handler) throws Exception

该方法在action执行前执行,可以实现对数据的预处理,比如:编码、安全控制等。

如果方法返回true,则继续执行action。

b) publicvoid postHandle
(HttpServletRequest request,HttpServletResponse response,
Object handler, ModelAndView modelAndView) throws Exception

该方法在action执行后,生成视图前执行。在这里,我们有机会修改视图层数据。

c) publicvoid afterCompletion(HttpServletRequest request,HttpServletResponse response, Object handler, Exception ex) throws Exception

最后执行,通常用于释放资源,处理异常。我们可以根据ex是否为空,来进行相关的异常处理。因为我们在平时处理异常时,都是从底层向上抛出异常,最后到了spring框架从而到了这个方法中。

2. 继承适配器:
org.springframework.web.servlet.handler.HandlerInterceptorAdapter

这个适配器实现了HandlerInterceptor接口。提供了这个接口中所有方法的空实现。

如下我们写出两个拦截器的示例代码,仅供大家参考:

package com.sxt.interceptor;

importjavax.interceptor.Interceptors;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

publicclass MyInterceptorimplements HandlerInterceptor {

@Override

publicvoid afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

System.out.println("最后执行!!!一般用于释放资源!!");

}

@Override

publicvoid postHandle(HttpServletRequest request,HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

System.out.println("Action执行之后,生成视图之前执行!!");

}

@Override

publicboolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler)throws Exception {

System.out.println("action之前执行!!!");

returntrue; //继续执行action

}

}

package com.sxt.interceptor;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

publicclass MyInterceptor2extends HandlerInterceptorAdapter {

@Override

publicboolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler)throws Exception {

System.out.println("MyInterceptor2.preHandle()");

returntrue; //继续执行action

}

}

3. XML中如何配置。如下为示例代码:

"com.sxt.interceptor.MyInterceptor">

"/user.do"/>

"com.sxt.interceptor.MyInterceptor2">

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