我们添加拦截器，拦截的是Controller里面的东西
在web工程添加新的包com.taotao.interceptor
LoginInterceptor.java
package com.taotao.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.taotao.pojo.ActiveUser;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
// TODO Auto-generated method stub
//执行后
}
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
throws Exception {
// TODO Auto-generated method stub
//执行前
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
//1.获取到请求的URL
String url = request.getRequestURI();
//2.判断，公共的资源给放行，否则拦截
if (url.equals("/login")||url.equals("/error")||url.equals("/user/login")) {
return true;
}
HttpSession session = request.getSession();//获取到session
ActiveUser activeUser = (ActiveUser) session.getAttribute("activeUser");//获取到session中存储的activeUser
if (null != activeUser) {//判断session中有数据
return true;
}
//跳转页面
request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
return false;
}
}
在springmvc.xml中配置
<mvc:interceptors>
<!-- 用户认证拦截 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<mvc:exclude-mapping path="/**/fonts/*"/>
<mvc:exclude-mapping path="/**/*.css"/>
<mvc:exclude-mapping path="/**/*.js"/>
<mvc:exclude-mapping path="/**/*.png"/>
<mvc:exclude-mapping path="/**/*.gif"/>
<mvc:exclude-mapping path="/**/*.jpg"/>
<mvc:exclude-mapping path="/**/*.jpeg"/>
<mvc:exclude-mapping path="/**/*validatecode*"/>
<mvc:exclude-mapping path="/**/*Login*"/>
<mvc:exclude-mapping path="/**/*error*"/>
<bean class="com.taotao.interceptor.LoginInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>拦截器优化：
因为项目越来越多，拦截器需要放行的也越来越多，所以在这么写就太麻烦了。
在这里就需要将需要放行的放入到一个配置文件annotionURL.properties中
#配置公开的URL
/user/login=登录url
/login=登录页面
/error=失败页面提示还需要一个工具类读取这个配置文件:ResourcesUtil.java
package com.taotao.utils;
import java.io.Serializable;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.Set;
/**
* 资源文件读取工具类
*
*/
public class ResourcesUtil implements Serializable {
private static final long serialVersionUID = -7657898714983901418L;
/**
* 系统语言环境，默认为中文zh
*/
public static final String LANGUAGE = "zh";
/**
* 系统国家环境，默认为中国CN
*/
public static final String COUNTRY = "CN";
private static Locale getLocale() {
Locale locale = new Locale(LANGUAGE, COUNTRY);
return locale;
}
/**
* 根据语言、国家、资源文件名和key名字获取资源文件值
*
* @param language
* 语言
*
* @param country
* 国家
*
* @param baseName
* 资源文件名
*
* @param section
* key名字
*
* @return 值
*/
private static String getProperties(String baseName, String section) {
String retValue = "";
try {
Locale locale = getLocale();
ResourceBundle rb = ResourceBundle.getBundle(baseName, locale);
retValue = (String) rb.getObject(section);
} catch (Exception e) {
e.printStackTrace();
// TODO 添加处理
}
return retValue;
}
/**
* 通过key从资源文件读取内容
*
* @param fileName
* 资源文件名
*
* @param key
* 索引
*
* @return 索引对应的内容
*/
public static String getValue(String fileName, String key) {
String value = getProperties(fileName,key);
return value;
}
public static List<String> gekeyList(String baseName) {
Locale locale = getLocale();
ResourceBundle rb = ResourceBundle.getBundle(baseName, locale);
List<String> reslist = new ArrayList<String>();
Set<String> keyset = rb.keySet();
for (Iterator<String> it = keyset.iterator(); it.hasNext();) {
String lkey = (String)it.next();
reslist.add(lkey);
}
return reslist;
}
/**
* 通过key从资源文件读取内容，并格式化
*
* @param fileName
* 资源文件名
*
* @param key
* 索引
*
* @param objs
* 格式化参数
*
* @return 格式化后的内容
*/
public static String getValue(String fileName, String key, Object[] objs) {
String pattern = getValue(fileName, key);
String value = MessageFormat.format(pattern, objs);
return value;
}
public static void main(String[] args) {
System.out.println(getValue("resources.messages", "101",new Object[]{100,200}));
//根据操作系统环境获取语言环境
/*Locale locale = Locale.getDefault();
System.out.println(locale.getCountry());//输出国家代码
System.out.println(locale.getLanguage());//输出语言代码s
//加载国际化资源（classpath下resources目录下的messages.properties，如果是中文环境会优先找messages_zh_CN.properties）
ResourceBundle rb = ResourceBundle.getBundle("resources.messages", locale);
String retValue = rb.getString("101");//101是messages.properties文件中的key
System.out.println(retValue);
//信息格式化，如果资源中有{}的参数则需要使用MessageFormat格式化，Object[]为传递的参数，数量根据资源文件中的{}个数决定
String value = MessageFormat.format(retValue, new Object[]{100,200});
System.out.println(value);
*/
}
}
然后优化LoginInterceptor代码：
package com.taotao.interceptor;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.taotao.pojo.ActiveUser;
import com.taotao.utils.ResourcesUtil;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
// TODO Auto-generated method stub
//执行后
}
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
throws Exception {
// TODO Auto-generated method stub
//执行前
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
//1.获取到请求的URL
String url = request.getRequestURI();
//2.判断，公共的资源给放行，否则拦截
//用工具类ResourcesUtil.java读取annotionURL.properties，返回一个list集合,读取annotionURL.properties中的key值
List<String> open_url = ResourcesUtil.gekeyList("annotionURL");
for (String open_urls : open_url) {
if (url.indexOf(open_urls)>=0) {
return true;
}
}
HttpSession session = request.getSession();//获取到session
ActiveUser activeUser = (ActiveUser) session.getAttribute("activeUser");//获取到session中存储的activeUser
if (null != activeUser) {//判断session中有数据
return true;
}
//跳转页面
request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
return false;
}
}