struts2异常处理

1、在action.xml中加入如下配置

		<global-results>
			<result name="exception" type="chain">jsonException</result>		
		</global-results>      
		<global-exception-mappings>
			<exception-mapping exception="java.lang.Exception" result="exception"/>
		</global-exception-mappings>
		
			

		<!-- 出错处理 -->
		<action name="jsonException" class="com.taobao.ad.zuanshi.web.common.JsonExceptionHandlerAction">
			<result name="success" type="json">
				<param name="root">ajaxResult</param>
			</result>
		</action> 

2、添加 JsonExceptionHandlerAction 异常处理类

package com.taobao.ad.zuanshi.web.common;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.alibaba.common.logging.Logger;
import com.alibaba.common.logging.LoggerFactory;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.util.ValueStack;
import com.taobao.ad.zuanshi.common.exception.BOException;


/**
 * 异常处理Action.
 * 
 * @author buming.pl
 */
public class JsonExceptionHandlerAction extends ActionSupport{
	
	/**
	 * serialVersionUID
	 */
	private static final long serialVersionUID = 6394328169901196101L;

	/** The Constant log. */
	protected static final Logger log = LoggerFactory.getLogger(JsonExceptionHandlerAction.class);
    
	/** The ajax result. */
	private AjaxResult ajaxResult;
	
	/* (non-Javadoc)
     * @see com.opensymphony.xwork2.ActionSupport#execute()
     */
    @SuppressWarnings("unchecked")
	@Override
    public String execute() throws Exception {
    	Exception exception = (Exception) findException();
		if (exception == null) {
			ajaxResult = AjaxResult.errorResult();
		} else {
			writeLog(exception);
			if (exception instanceof IllegalArgumentException) {
				ajaxResult = AjaxResult.errorResult(getText(exception.getMessage()));
			} else if (exception instanceof BOException) {
				ajaxResult = AjaxResult.errorResult(getText(exception.getMessage()));
			} else {
	            ajaxResult = AjaxResult.errorResult();
			}
		}
    	return SUCCESS;
    }
    
    private Object findException() {        
        ActionContext ac = ActionContext.getContext();
        ValueStack vs = ac.getValueStack();
        Object exception = vs.findValue("exception");       
        return exception;
    }
    
	/**
	 * Write log.
	 * 
	 * @param e the e
	 */
	@SuppressWarnings("unchecked")
	private void writeLog(Exception e) {
		HttpServletRequest request = ServletActionContext.getRequest();
		StringBuffer sb = new StringBuffer();
		sb.append("requestUrl:[").append(ServletActionContext.getRequest().getRequestURI()).append("],");
		sb.append("parameterMap:[");
		Enumeration parameterNames = ServletActionContext.getRequest().getParameterNames();
		while (parameterNames.hasMoreElements()) {
			String pName = parameterNames.nextElement().toString();
			sb.append(pName);
			sb.append("=");
			sb.append(request.getParameter(pName));
			sb.append(parameterNames.hasMoreElements()?",":"");
	    }
		sb.append("],");
		log.error("Exception:" + sb.toString(), e);
	}
    

	public AjaxResult getAjaxResult() {
		return ajaxResult;
	}

}

 

3、在你的BO层代码中，如果需要抛出异常，可以直接使用

throw new BOException("业务出错");

4、如果是BO层参数验证的问题，可以使用spring的Assert，会抛出IllegalArgumentException异常

Assert.isNotNull(id,"ID不能为空");

5、现在支持的异常有 IllegalArgumentException，BOException，HSFRemoteException，其他的异常全部走基本异常，返回“系统错误”