Spring Security 4 安全视图片段使用标签（Spring Security 标签）

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原文地址： http://websystique.com/spring-security/spring-security-4-secure-view-layer-using-taglibs/

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本教程向你展示怎样创建安全视图层，Spring MVC web 应用中，使用Spring Security 标签，基于用户角色显示或者隐藏部分jsp或者视图。

第一步,想使用Spring Security标签需要在pom.xml文件中添加 spring-security-taglibs依赖

代码语言：javascript复制

    org.springframework.security
    spring-security-taglibs
    4.0.1.RELEASE

下一步，在views或者jsp页面头添加包含标签

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<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags"%>

最后，我们可以使用 Spring Security 表单式中 hasRole, hasAnyRole等标签，如下：

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags"%>


    
    Welcome page


    Dear ${user}, Welcome to Home Page.
    ">Logout
 
    

    

    
        View all information| This part is visible to Everyone
    
 
    

    
        
            Edit this page | This part is visible only to ADMIN
        
    
 
    

    
        
            Start backup | This part is visible only to one who is both ADMIN & DBA

如果你需要根据角色显示或者隐藏视图中的片段，可以参考上面的例子。

下面是本例中 Security Configuration 的配置：

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package com.websystique.springsecurity.configuration;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 
@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
 
     
    @Autowired
    public void configureGlobalSecurity(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().withUser("bill").password("abc123").roles("USER");
        auth.inMemoryAuthentication().withUser("admin").password("root123").roles("ADMIN");
        auth.inMemoryAuthentication().withUser("dba").password("root123").roles("ADMIN","DBA");
    }
     
    @Override
    protected void configure(HttpSecurity http) throws Exception {
       
      http.authorizeRequests()
        .antMatchers("/", "/home").access("hasRole('USER') or hasRole('ADMIN') or hasRole('DBA')")
        .and().formLogin().loginPage("/login")
        .usernameParameter("ssoId").passwordParameter("password")
        .and().exceptionHandling().accessDeniedPage("/Access_Denied");
    }
}

上面配置对应的xml配置如下：

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controller

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package com.websystique.springsecurity.controller;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@Controller
public class HelloWorldController {
 
     
    @RequestMapping(value = { "/", "/home" }, method = RequestMethod.GET)
    public String homePage(ModelMap model) {
        model.addAttribute("user", getPrincipal());
        return "welcome";
    }
 
    @RequestMapping(value = "/Access_Denied", method = RequestMethod.GET)
    public String accessDeniedPage(ModelMap model) {
        model.addAttribute("user", getPrincipal());
        return "accessDenied";
    }
 
    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String loginPage() {
        return "login";
    }
 
    @RequestMapping(value="/logout", method = RequestMethod.GET)
    public String logoutPage (HttpServletRequest request, HttpServletResponse response) {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        if (auth != null){    
            new SecurityContextLogoutHandler().logout(request, response, auth);
        }
        return "redirect:/login?logout";
    }
 
    private String getPrincipal(){
        String userName = null;
        Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
 
        if (principal instanceof UserDetails) {
            userName = ((UserDetails)principal).getUsername();
        } else {
            userName = principal.toString();
        }
        return userName;
    }
 
}

其他代码和本系列其他文章一样。