Spring security用户URL权限FilterSecurityInterceptor使用解析

这篇文章主要介绍了Spring security用户URL权限FilterSecurityInterceptor使用解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

用户通过浏览器发送URL地址，由FilterSecurityInterceptor判断是否具有相应的访问权限。

对于用户请求的方法权限，例如注解@PreAuthorize("hasRole('ADMIN')")，由MethodSecurityInterceptor判断

两个拦截器都继承了AbstractSecurityInterceptor

代码如下

package org.springframework.security.web.access.intercept;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.springframework.security.access.SecuritymetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;

public class FilterSecurityInterceptor extends AbstractSecurityInterceptor implements
		Filter {
	// ~ Static fields/initializers
	// =====================================================================================
	private static final String FILTER_APPLIED = "__spring_security_filterSecurityInterceptor_filterApplied";
	// ~ Instance fields
	// ================================================================================================
	
	private FilterInvocationSecuritymetadataSource securitymetadataSource;
	private Boolean observeoncePerRequest = true;
	// ~ Methods
	// ========================================================================================================
	
	public void init(FilterConfig arg0) throws ServletException {
	}
	
	public void destroy() {
	}
	
	public void doFilter(ServletRequest request, ServletResponse response,
				FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}
	public FilterInvocationSecuritymetadataSource getSecuritymetadataSource() {
		return this.securitymetadataSource;
	}
	public SecuritymetadataSource obtainSecuritymetadataSource() {
		return this.securitymetadataSource;
	}
	public void setSecuritymetadataSource(FilterInvocationSecuritymetadataSource newSource) {
		this.securitymetadataSource = newSource;
	}
	public Class getSecureObjectClass() {
		return FilterInvocation.class;
	}
	public void invoke(FilterInvocation fi) throws IOException, ServletException {
		//获取当前http请求的地址，比如说“/login”
		if ((fi.getRequest() != null)
						&& (fi.getRequest().getAttribute(FILTER_APPLIED) != null)
						&& observeOncePerRequest) {
			// filter already applied to this request and user wants us to observe
			// once-per-request handling, so don't re-do security checking
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		} else {
			// first time this request being called, so perform security checking
			if (fi.getRequest() != null) {
				fi.getRequest().setAttribute(FILTER_APPLIED, Boolean.TRUE);
			}
			//这里做主要URL比对，将当前URL与securitymetadataSource(我们自己配置)中的URL过滤条件进行比对
			//首先判断当前URL是permit的还是需要验证的
			//若需要验证，尝试加载保存在SecurityContextHolder.getContext()中的已登录信息
			//调用AbstractSecurityInterceptor中的AccessDecisionManager对象的decide方法
			//如果对于配置中需要登录才可访问的URL，已经查找到登录信息，则执行下一个Filter
			InterceptorStatusToken token = super.beforeInvocation(fi);
			try {
				fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
			}
			finally {
				super.finallyInvocation(token);
			}
			super.afterInvocation(token, null);
		}
	}
	
	public Boolean isObserveoncePerRequest() {
		return observeOncePerRequest;
	}
	public void setObserveoncePerRequest(Boolean observeOncePerRequest) {
		this.observeoncePerRequest = observeOncePerRequest;
	}
}

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