在Struts2中对Ajax请求的异常进行统一处理

1、自定义异常类

public class AjaxException extends RuntimeException {
	public AjaxException() {
		super();
	}

	public AjaxException(String message) {
		super(message);
	}

	public AjaxException(Throwable cause) {
		super(cause);
	}

	public AjaxException(String message, Throwable cause) {
		super(message, cause);
	}
}

2、新建一个用于处理异常的Action类

public class AjaxExceptionProcessorAction extends ActionSupport {
	private Exception exception;
	
	public String execute(){
		Map<String, String> resultMap = new HashMap<String, String>();
		resultMap.put(RESULT_CODE, "false");
		if(exception != null){
			resultMap.put(ERROR_MESSAGE, exception.getMessage());
		}

		res.setContentType("text/json;charset=UTF-8");
		res.setHeader("Cache-Control","no-cache");
		res.setCharacterEncoding("utf-8");
		PrintWriter out = ServletActionContext.getResponse().getWriter();
		out.write(str);
		out.close();
		return null;
	}
	
	public Exception getException() {
		return exception;
	}
	public void setException(Exception exception) {
		this.exception = exception;
	}
}

3、在struts.xml文件中进行以下配置

<global-results> 
	<result name="ajaxError" type="chain">
		<param name="actionName">ajaxExceptionProcessor</param>
	</result>
</global-results>

<global-exception-mappings>
	<exception-mapping result="ajaxError" exception="com.gsafc.framework.exception.AjaxException"></exception-mapping>
</global-exception-mappings>

<action name="ajaxExceptionProcessor" class="com.XXX.AjaxExceptionProcessorAction" />