struts2自定义标签，实现权限认证

* 编写PermissionComponent，该类需继承org.apache.struts2.components.Component类

Java代码






package com.bjsxt.oa.web.tag;

import java.io.Writer;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.components.Component;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.bjsxt.oa.manager.AclManager;
import com.opensymphony.xwork2.util.ValueStack;

public class PermissionComponent extends Component {

private AclManager aclManager;

private int userId;

private String resourceSn;

private int pn;

public PermissionComponent(ValueStack stack, HttpServletRequest request) {
super(stack);
this.setAclManager(request);
}

@Override
public boolean start(Writer writer) {
boolean result = aclManager.hasPermissionByResourceSn(userId,
resourceSn, pn);
System.out.println("result=" + result);

// try {
// if (result) {
// writer.write("true");
// return result;
// }
// writer.write("false");
// } catch (IOException e) {

// e.printStackTrace();
// }

//当返回值为true时，body的内容被输出；false时，则被忽略，即不输出

return result;
}

@Override
public boolean end(Writer writer, String body) {
return super.end(writer, body);
}

public int getUserId() {
return userId;
}

public void setUserId(int userId) {
this.userId = userId;
}

public String getResourceSn() {
return resourceSn;
}

public void setResourceSn(String resourceSn) {
this.resourceSn = resourceSn;
}

public int getPn() {
return pn;
}

public void setPn(int pn) {
this.pn = pn;
}

public void setAclManager(AclManager aclManager) {
this.aclManager = aclManager;
}

public void setAclManager(HttpServletRequest request) {

WebApplicationContext wac = WebApplicationContextUtils
.getRequiredWebApplicationContext(request.getSession()
.getServletContext());

this.aclManager = (AclManager) wac.getBean("aclManager");
}

}

package com.bjsxt.oa.web.tag;

import java.io.Writer;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.components.Component;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.bjsxt.oa.manager.AclManager;
import com.opensymphony.xwork2.util.ValueStack;

public class PermissionComponent extends Component {

private AclManager aclManager;

private int userId;

private String resourceSn;

private int pn;

public PermissionComponent(ValueStack stack, HttpServletRequest request) {
super(stack);
this.setAclManager(request);
}

@Override
public boolean start(Writer writer) {
boolean result = aclManager.hasPermissionByResourceSn(userId,
resourceSn, pn);
System.out.println("result=" + result);

// try {
// if (result) {
// writer.write("true");
// return result;
// }
// writer.write("false");
// } catch (IOException e) {
// e.printStackTrace();
// }

//当返回值为true时，body的内容被输出；false时，则被忽略，即不输出
return result;
}

@Override
public boolean end(Writer writer, String body) {
return super.end(writer, body);
}

public int getUserId() {
return userId;
}

public void setUserId(int userId) {
this.userId = userId;
}

public String getResourceSn() {
return resourceSn;
}

public void setResourceSn(String resourceSn) {
this.resourceSn = resourceSn;
}

public int getPn() {
return pn;
}

public void setPn(int pn) {
this.pn = pn;
}

public void setAclManager(AclManager aclManager) {
this.aclManager = aclManager;
}

public void setAclManager(HttpServletRequest request) {

WebApplicationContext wac = WebApplicationContextUtils
.getRequiredWebApplicationContext(request.getSession()
.getServletContext());

this.aclManager = (AclManager) wac.getBean("aclManager");
}

}

* 编写PermissionTag类，该类需继承org.apache.struts2.views.jsp.ComponentTagSupport类

Java代码






package com.bjsxt.oa.web.tag; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.components.Component; import org.apache.struts2.views.jsp.ComponentTagSupport; import com.opensymphony.xwork2.util.ValueStack; public class PermissionTag extends ComponentTagSupport { private static final long serialVersionUID = 1631842497771460718L; private int userId; private String resourceSn; private int pn; @Override public Component getBean(ValueStack stack, HttpServletRequest request, HttpServletResponse arg2) { return new PermissionComponent(stack, request); } @Override protected void populateParams() { super.populateParams(); PermissionComponent pct = (PermissionComponent) component; pct.setUserId(userId); pct.setPn(pn); pct.setResourceSn(resourceSn); } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } public String getResourceSn() { return resourceSn; } public void setResourceSn(String resourceSn) { this.resourceSn = resourceSn; } public int getPn() { return pn; } public void setPn(int pn) { this.pn = pn; } }

package com.bjsxt.oa.web.tag;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.components.Component;
import org.apache.struts2.views.jsp.ComponentTagSupport;

import com.opensymphony.xwork2.util.ValueStack;

public class PermissionTag extends ComponentTagSupport {

private static final long serialVersionUID = 1631842497771460718L;

private int userId;

private String resourceSn;

private int pn;

@Override
public Component getBean(ValueStack stack, HttpServletRequest request,
HttpServletResponse arg2) {
return new PermissionComponent(stack, request);
}

@Override
protected void populateParams() {
super.populateParams();
PermissionComponent pct = (PermissionComponent) component;
pct.setUserId(userId);
pct.setPn(pn);
pct.setResourceSn(resourceSn);
}

public int getUserId() {
return userId;
}

public void setUserId(int userId) {
this.userId = userId;
}

public String getResourceSn() {
return resourceSn;
}

public void setResourceSn(String resourceSn) {
this.resourceSn = resourceSn;
}

public int getPn() {
return pn;
}

public void setPn(int pn) {
this.pn = pn;
}
}

* 编写permission.tld文件，将该文件放到WEB-INF下面

Xml代码






<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"> <taglib> <tlib-version>2.2.3</tlib-version> <jsp-version>1.2</jsp-version> <short-name>my</short-name> <uri>/jtime</uri> <tag> <name>permission</name> <tag-class>com.bjsxt.oa.web.tag.PermissionTag</tag-class> <body-content>JSP</body-content> <attribute> <name>userId</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>resourceSn</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>pn</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">

<taglib>
<tlib-version>2.2.3</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>my</short-name>
<uri>/jtime</uri>
<tag>
<name>permission</name>
<tag-class>com.bjsxt.oa.web.tag.PermissionTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<name>userId</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>resourceSn</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pn</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>

需要注意<body-content>JSP</body-content>这句话的含义，不同的参数表示对自定义标签的body的不同处理

* 在jsp中进行引用

Java代码






<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="my" uri="/WEB-INF/permission.tld"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transictional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>Tagtest</title>

</head>

<body>
This is my JSP page.
<br>
<my:permission userId='3' pn='1' resourceSn='orgmgr'>has</my:permission>
</body>
</html>