工具类：
package com.taotao.common.utils; import java.io.PrintWriter;
import java.io.StringWriter; public class ExceptionUtil { /**
* 获取异常的堆栈信息（先打印到控制台，再返回字符串形式）
*
* @param t
* @return
*/
public static String getStackTrace(Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw); try {
t.printStackTrace(pw);
return sw.toString();
} finally {
pw.close();
}
}
}
使用方法：
package com.taotao.rest.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody; import com.taotao.common.pojo.TaotaoResult;
import com.taotao.common.utils.ExceptionUtil;
import com.taotao.pojo.TbContent;
import com.taotao.rest.service.ContentService; @Controller
@RequestMapping("/content")
public class ContentController { @Autowired
ContentService contentService; @RequestMapping("/list/{contentCategoryId}")
@ResponseBody
public TaotaoResult getContentList(@PathVariable Long contentCategoryId) {
//因为是提供接口服务，所以要处理异常，以便返回信息给调用者
try {
List<TbContent> list = contentService.getContentList(contentCategoryId);
return TaotaoResult.ok(list);
} catch (Exception e) {
return TaotaoResult.build(500, ExceptionUtil.getStackTrace(e));
}
} }
springMvc Controller层返回结果封装的对象：
package com.taotao.common.pojo; import java.util.List; import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper; /**
* 淘淘商城自定义响应结构
*/
public class TaotaoResult { // 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; public static TaotaoResult build(Integer status, String msg, Object data) {
return new TaotaoResult(status, msg, data);
} public static TaotaoResult ok(Object data) {
return new TaotaoResult(data);
} public static TaotaoResult ok() {
return new TaotaoResult(null);
} public TaotaoResult() { } public static TaotaoResult build(Integer status, String msg) {
return new TaotaoResult(status, msg, null);
} public TaotaoResult(Integer status, String msg, Object data) {
this.status = status;
this.msg = msg;
this.data = data;
} public TaotaoResult(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;
} /**
* 将json结果集转化为TaotaoResult对象
*
* @param jsonData json数据
* @param clazz TaotaoResult中的object类型
* @return
*/
public static TaotaoResult formatToPojo(String jsonData, Class<?> clazz) {
try {
if (clazz == null) {
return MAPPER.readValue(jsonData, TaotaoResult.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;
}
} /**
* 没有object对象的转化
*
* @param json
* @return
*/
public static TaotaoResult format(String json) {
try {
return MAPPER.readValue(json, TaotaoResult.class);
} catch (Exception e) {
e.printStackTrace();
}
return null;
} /**
* Object是集合转化
*
* @param jsonData json数据
* @param clazz 集合中的类型
* @return
*/
public static TaotaoResult 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;
}
} }