标签：全局异常处理
全局异常处理
package yycg.base.process.exception;
import java.io.IOException;
import java.lang.reflect.Method;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.http.server.ServletServerHttpResponse;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import yycg.base.process.result.ExceptionResultInfo;
import yycg.base.process.result.ResultInfo;
/**
* 全局异常处理器
* @author Administrator
*
*/
public class ExceptionResolverCustom implements HandlerExceptionResolver {
// json转换器
// 将异常信息转json
private HttpMessageConverter<ExceptionResultInfo> jsonMessageConverter;
// 前端控制器调用此方法执行异常处理
// handler，执行的action类就包装了一个方法（对应url的方法）
@Override
public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex) {
// 输出 异常信息
ex.printStackTrace();
// 转成springmvc底层对象（就是对action方法的封装对象，只有一个方法）
HandlerMethod handlerMethod = (HandlerMethod) handler;
// 取出方法
Method method = handlerMethod.getMethod();
// 判断方法是否返回json
// 只要方法上有responsebody注解表示返回json
// 查询method是否有responsebody注解
ResponseBody responseBody = AnnotationUtils.findAnnotation(method,
ResponseBody.class);
if (responseBody != null) {
// 将异常信息转json输出
return this.resolveJsonException(request, response, handlerMethod,
ex);
}
// 这里说明action返回的是jsp页面
// 解析异常
ExceptionResultInfo exceptionResultInfo = resolveExceptionCustom(ex);
// 将异常信息在异常页面显示
request.setAttribute("exceptionResultInfo",
exceptionResultInfo.getResultInfo());
// 转向错误页面
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("exceptionResultInfo",
exceptionResultInfo.getResultInfo());
modelAndView.setViewName("/base/error");// 逻辑视图名
return modelAndView;
}
// 异常信息解析方法
private ExceptionResultInfo resolveExceptionCustom(Exception ex) {
ResultInfo resultInfo = null;
if (ex instanceof ExceptionResultInfo) {
// 抛出的是系统自定义异常
resultInfo = ((ExceptionResultInfo) ex).getResultInfo();
} else {
// 重新构造“未知错误”异常
resultInfo = new ResultInfo();
resultInfo.setType(ResultInfo.TYPE_RESULT_FAIL);
resultInfo.setMessage("未知错误！");
}
return new ExceptionResultInfo(resultInfo);
}
// 将异常信息转json输出
private ModelAndView resolveJsonException(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex) {
// 解析异常
ExceptionResultInfo exceptionResultInfo = resolveExceptionCustom(ex);
HttpOutputMessage outputMessage = new ServletServerHttpResponse(response);
try {
//将exceptionResultInfo对象转成json输出
jsonMessageConverter.write(exceptionResultInfo, MediaType.APPLICATION_JSON, outputMessage);
} catch (HttpMessageNotWritableException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return new ModelAndView();
}
public HttpMessageConverter<ExceptionResultInfo> getJsonMessageConverter() {
return jsonMessageConverter;
}
public void setJsonMessageConverter(
HttpMessageConverter<ExceptionResultInfo> jsonMessageConverter) {
this.jsonMessageConverter = jsonMessageConverter;
}
}
标签：全局异常处理
原文地址：http://11050579.blog.51cto.com/11040579/1893049
