Struts应用全注解，配置拦截器(Interceptor)和注解配置Json(struts-json插件)

Struts注解插件和struts-Json插件都默认继承struts-default包,导致无法同时使用注解，因为Action类只能有一个父包，配置其中一个都会把另一个给覆盖掉，嘿嘿，不用担心，只需要把struts-json插件中的默认配置都拷到struts.xml配置文件即可

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配置步骤：

一、查看struts-json插件中的默认配置文件：struts-plugin.xml代码：

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<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
        "http://struts.apache.org/dtds/struts-2.1.7.dtd">

<struts>
    <package name="json-default" extends="struts-default">

        <result-types>
            <result-type name="json" class="org.apache.struts2.json.JSONResult"/>
        </result-types>

        <interceptors>
            <interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
            <interceptor name="jsonValidation" class="org.apache.struts2.json.JSONValidationInterceptor"/>

            <!-- Sample JSON validation stack -->
            <interceptor-stack name="jsonValidationWorkflowStack">
                <interceptor-ref name="basicStack"/>
                <interceptor-ref name="validation">
                    <param name="excludeMethods">input,back,cancel</param>
                </interceptor-ref>
                <interceptor-ref name="jsonValidation"/>
                <interceptor-ref name="workflow"/>
            </interceptor-stack>

        </interceptors>

    </package>
</struts>

?二、把上面配置信息全部都拷到struts.xml中

1>我的拦截器代码，一个简单的登录拦截器：LoginInterceptor.java

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package com.kaishengit.web.interceptor;

import java.util.Map;
import java.util.Set;


import com.kaishengit.pojo.Employee;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.opensymphony.xwork2.util.TextParseUtil;

public class LoginInterceptor extends AbstractInterceptor{

	private static final long serialVersionUID = 1L;
	private String excludeActionName;//剔除的拦截方法
	private String sessionName;//用户名在session中存放的key值
	
	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		String actionName = invocation.getProxy().getActionName();//获取当前访问的action名字
		
		Set<String> set = TextParseUtil.commaDelimitedStringToSet(excludeActionName);
		
		if(set.contains(actionName)){
			return invocation.invoke();
		}else{
			Map<String, Object> session = invocation.getInvocationContext().getSession();
			Employee employee = (Employee) session.get(sessionName);
			if(employee == null){
				return "login";//没有登录，跳转到登录页
			}else{
				return invocation.invoke();
			}
		}
	}
	
	
	//get set
	public String getExcludeActionName() {
		return excludeActionName;
	}
	public void setExcludeActionName(String excludeActionName) {
		this.excludeActionName = excludeActionName;
	}
	public String getSessionName() {
		return sessionName;
	}
	public void setSessionName(String sessionName) {
		this.sessionName = sessionName;
	}
	
	
	
}

?2>配置struts.xml配置文件

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
	"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
	<constant name="struts.convention.result.path" value="/WEB-INF/views"/>
	<!--配置Struts-convention注解的默认父包  -->
	<constant name="struts.convention.default.parent.package" value="myPackage"/>
	
	<!--继承Struts-convention注解插件的xml  -->
	<package name="myPackage" extends="convention-default">
	
		<!-- 把Struts-json插件默认配置文件代码全部有序copy过来 -->
		<!-- json -->
		<result-types>
            <result-type name="json" class="org.apache.struts2.json.JSONResult"/>
        </result-types>
	
		 <interceptors>
			<interceptor name="loginInterceptor" class="com.kaishengit.web.interceptor.LoginInterceptor"/>
			
			<!-- json -->
		 	<interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
            <interceptor name="jsonValidation" class="org.apache.struts2.json.JSONValidationInterceptor"/>
            
            <!-- 拦截器栈名采用Struts-json插件的栈名 -->
			<interceptor-stack name="jsonValidationWorkflowStack">
				<interceptor-ref name="loginInterceptor">
					<param name="sessionName">employee</param>
					<param name="excludeActionName">index,login</param>
				</interceptor-ref>
				<interceptor-ref name="defaultStack"/>
				
				<!-- json -->
				<interceptor-ref name="basicStack"/>
                <interceptor-ref name="validation">
                    <param name="excludeMethods">input,back,cancel</param>
                </interceptor-ref>
                <interceptor-ref name="jsonValidation"/>
                <interceptor-ref name="workflow"/>
			</interceptor-stack>
		</interceptors>
		
		<default-interceptor-ref name="jsonValidationWorkflowStack"/> 
		
		<global-results>
			<result name="login" type="redirectAction">index.action</result>
		</global-results>
	</package>
</struts>

? 三、注解使用Json，一个例子

package com.kaishengit.action;

import java.util.ArrayList;
import java.util.List;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.beans.factory.annotation.Autowired;

import com.kaishengit.pojo.Employee;
import com.kaishengit.pojo.FileType;
import com.kaishengit.pojo.Message;
import com.kaishengit.pojo.Project;
import com.kaishengit.service.EmployeeService;

public class CopyOfAjaxAction extends BaseAction{
	private static final long serialVersionUID = 1L;
	private EmployeeService employeeService;
	private List<Employee> employeeList;
	private Employee employee;
	private String id;
	private Message message;
	private Project project;
	private FileType fileType;
	
	
	/**
	 * 显示employee
	 */
	//注解使用方式↓
	@Action(value="employeeJson",results={@Result(name="success",params={"root","employeeList","noCache","true","enableGZIP","true","excludeNullProperties","true"},type="json")})
	public String execute(){
		
		employeeList = employeeService.findAll();
		
		
		//定制json
		List<Employee> jsonList = new ArrayList<Employee>();
		
		for (Employee employee : employeeList) {
			Employee jsonEmployee = new Employee();
			jsonEmployee.setId(employee.getId());
			jsonEmployee.setUsername(employee.getUsername());
			jsonList.add(jsonEmployee);
		}
		
		employeeList = jsonList;
		
		return "success";
	}
	
	
	//get set
	
	public List<Employee> getEmployeeList() {
		return employeeList;
	}
	public void setEmployeeList(List<Employee> employeeList) {
		this.employeeList = employeeList;
	}


	public String getId() {
		return id;
	}



	public void setId(String id) {
		this.id = id;
	}

	

	public Employee getEmployee() {
		return employee;
	}



	public void setEmployee(Employee employee) {
		this.employee = employee;
	}



	public Message getMessage() {
		return message;
	}

	public void setMessage(Message message) {
		this.message = message;
	}

	public Project getProject() {
		return project;
	}

	public void setProject(Project project) {
		this.project = project;
	}

	public FileType getFileType() {
		return fileType;
	}

	public void setFileType(FileType fileType) {
		this.fileType = fileType;
	}
	

	@Autowired
	public void setEmployeeService(EmployeeService employeeService) {
		this.employeeService = employeeService;
	}

	
}

ok,很easy吧...