请结合springboot学习教程项目github地址 https://github.com/heng1234/spring-boot_one来理解
结合前面2个web和ajax处理看
异常处理类
package com.yh.exception;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;
import com.yh.pojo.HlvyJSONResult;
@ControllerAdvice
public class HlvyExceptionHandler {
static final String TO_URL = "/thymeleaf/error/error";
/**
* ajax与uil访问异常都可以被拦截
* Title: errExceyion
* Description:
* @param request
* @param response
* @param e
* @return
* @throws Exception
*/
@ExceptionHandler(value= Exception.class)
public Object errExceyion(HttpServletRequest request,HttpServletResponse response,Exception e) throws Exception {
e.printStackTrace();
if (isAjax(request)) {
return HlvyJSONResult.errorException(e.getMessage());
} else {
ModelAndView mav = new ModelAndView();
mav.addObject("e", e);
mav.addObject("url", request.getRequestURI());
mav.setViewName(TO_URL);
return mav;
}
}
/**
* 判断是否是ajax请求
* Title: isAjax
* Description:
* @param httpRequest
* @return
*/
public static boolean isAjax(HttpServletRequest httpRequest){
return (httpRequest.getHeader("X-Requested-With") != null
&& "XMLHttpRequest"
.equals( httpRequest.getHeader("X-Requested-With").toString()) );
}
}
HlvyJSONResult
package com.yh.pojo;
import java.util.List;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
*
* @Title: LeeJSONResult.java
* @Package com.lee.utils
* @Description: 自定义响应数据结构
* 这个类是提供给门户,ios,安卓,微信商城用的
* 门户接受此类数据后需要使用本类的方法转换成对于的数据类型格式(类,或者list)
* 其他自行处理
* 200:表示成功
* 500:表示错误,错误信息在msg字段中
* 501:bean验证错误,不管多少个错误都以map形式返回
* 502:拦截器拦截到用户token出错
* 555:异常抛出信息
* Copyright: Copyright (c) 2016
* Company:Nathan.Lee.Salvatore
*
* @author leechenxiang
* @date 2016年4月22日 下午8:33:36
* @version V1.0
*/
public class HlvyJSONResult {
// 定义jackson对象
private static final ObjectMapper MAPPER = new ObjectMapper();
// 响应业务状态
private Integer status;
// 响应消息
private String msg;
// 响应中的数据
private Object data;
private String ok; // 不使用
public static HlvyJSONResult build(Integer status, String msg, Object data) {
return new HlvyJSONResult(status, msg, data);
}
public static HlvyJSONResult ok(Object data) {
return new HlvyJSONResult(data);
}
public static HlvyJSONResult ok() {
return new HlvyJSONResult(null);
}
public static HlvyJSONResult errorMsg(String msg) {
return new HlvyJSONResult(500, msg, null);
}
public static HlvyJSONResult errorMap(Object data) {
return new HlvyJSONResult(501, "error", data);
}
public static HlvyJSONResult errorTokenMsg(String msg) {
return new HlvyJSONResult(502, msg, null);
}
public static HlvyJSONResult errorException(String msg) {
return new HlvyJSONResult(555, msg, null);
}
public HlvyJSONResult() {
}
// public static LeeJSONResult build(Integer status, String msg) {
// return new LeeJSONResult(status, msg, null);
// }
public HlvyJSONResult(Integer status, String msg, Object data) {
this.status = status;
this.msg = msg;
this.data = data;
}
public HlvyJSONResult(Object data) {
this.status = 200;
this.msg = "OK";
this.data = data;
}
public Boolean isOK() {
return this.status == 200;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
/**
*
* @Description: 将json结果集转化为LeeJSONResult对象
* 需要转换的对象是一个类
* @param jsonData
* @param clazz
* @return
*
* @author leechenxiang
* @date 2016年4月22日 下午8:34:58
*/
public static HlvyJSONResult formatToPojo(String jsonData, Class> clazz) {
try {
if (clazz == null) {
return MAPPER.readValue(jsonData, HlvyJSONResult.class);
}
JsonNode jsonNode = MAPPER.readTree(jsonData);
JsonNode data = jsonNode.get("data");
Object obj = null;
if (clazz != null) {
if (data.isObject()) {
obj = MAPPER.readValue(data.traverse(), clazz);
} else if (data.isTextual()) {
obj = MAPPER.readValue(data.asText(), clazz);
}
}
return build(jsonNode.get("status").intValue(), jsonNode.get("msg").asText(), obj);
} catch (Exception e) {
return null;
}
}
/**
*
* @Description: 没有object对象的转化
* @param json
* @return
*
* @author leechenxiang
* @date 2016年4月22日 下午8:35:21
*/
public static HlvyJSONResult format(String json) {
try {
return MAPPER.readValue(json, HlvyJSONResult.class);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
*
* @Description: Object是集合转化
* 需要转换的对象是一个list
* @param jsonData
* @param clazz
* @return
*
* @author leechenxiang
* @date 2016年4月22日 下午8:35:31
*/
public static HlvyJSONResult formatToList(String jsonData, Class> clazz) {
try {
JsonNode jsonNode = MAPPER.readTree(jsonData);
JsonNode data = jsonNode.get("data");
Object obj = null;
if (data.isArray() && data.size() > 0) {
obj = MAPPER.readValue(data.traverse(),
MAPPER.getTypeFactory().constructCollectionType(List.class, clazz));
}
return build(jsonNode.get("status").intValue(), jsonNode.get("msg").asText(), obj);
} catch (Exception e) {
return null;
}
}
public String getOk() {
return ok;
}
public void setOk(String ok) {
this.ok = ok;
}
}
web跳转html页面:
Insert title here
ajax html页面
测试ajax错误异常
ajaxerror.js
$.ajax({
url: "/error/ajaxError",
type: "POST",
async: false,
success: function(data) {
debugger;
if(data.status == 200 && data.msg == "OK") {
alert("success");
} else {
alert("发生异常:" + data.msg);
}
},
error: function (response, ajaxOptions, thrownError) {
debugger;
alert("error");
}
});